NZ626417B - A patient interface system for treatment of respiratory disorders - Google Patents
A patient interface system for treatment of respiratory disordersInfo
- Publication number
- NZ626417B NZ626417B NZ626417A NZ62641714A NZ626417B NZ 626417 B NZ626417 B NZ 626417B NZ 626417 A NZ626417 A NZ 626417A NZ 62641714 A NZ62641714 A NZ 62641714A NZ 626417 B NZ626417 B NZ 626417B
- Authority
- NZ
- New Zealand
- Prior art keywords
- patient
- patient interface
- positioning
- plenum chamber
- pair
- Prior art date
Links
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/06—Respiratory or anaesthetic masks
- A61M16/0605—Means for improving the adaptation of the mask to the patient
- A61M16/0616—Means for improving the adaptation of the mask to the patient with face sealing means comprising a flap or membrane projecting inwards, such that sealing increases with increasing inhalation gas pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/06—Respiratory or anaesthetic masks
- A61M16/0683—Holding devices therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P11/00—Drugs for disorders of the respiratory system
Abstract
Disclosed is a patient interface system or face mask to treat a respiratory or breathing disorder of a patient using CPAP, the patient interface system comprising: a positioning and stabilising structure including a back portion and a pair of upper straps and a pair of lower straps each extending from the back portion; and a patient interface including a patient interface frame and a pair of rigidiser arms each connected to the patient interface frame at a connection point located in a plane substantially parallel to the patient’s Frankfort horizontal plane, the pair of rigidiser arms further including a pair of upper attachment points, wherein the pair of upper straps are adapted to be releasably attached to the pair of upper attachment points such that, when donned by the patient, the pair of upper straps are vertically offset relative to the upper attachment points and substantially parallel to the patient’s Frankfort horizontal plane, and wherein the patient interface does not include a forehead support. The patient interface further comprises a plenum chamber where the frame is releasably attachable to the plenum chamber and a seal-forming structure of one piece where the plenum chamber comprises a more rigid material than the seal-forming structure. The plenum chamber comprises polycarbonate and the seal-forming structure comprises silicone. The frame has lower attachment points for the lower straps. om the back portion; and a patient interface including a patient interface frame and a pair of rigidiser arms each connected to the patient interface frame at a connection point located in a plane substantially parallel to the patient’s Frankfort horizontal plane, the pair of rigidiser arms further including a pair of upper attachment points, wherein the pair of upper straps are adapted to be releasably attached to the pair of upper attachment points such that, when donned by the patient, the pair of upper straps are vertically offset relative to the upper attachment points and substantially parallel to the patient’s Frankfort horizontal plane, and wherein the patient interface does not include a forehead support. The patient interface further comprises a plenum chamber where the frame is releasably attachable to the plenum chamber and a seal-forming structure of one piece where the plenum chamber comprises a more rigid material than the seal-forming structure. The plenum chamber comprises polycarbonate and the seal-forming structure comprises silicone. The frame has lower attachment points for the lower straps.
Description
1 A PATIENT INTERFACE SYSTEM FOR TREATMENT OF
RESPIRATORY DISORDERS
2 CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of US Provisional Application Nos.
61/953,240, filed March 14, 2014, and 61/847,415, filed July 17, 2013, each of which is
incorporated herein by reference in its entirety.
3 BACKGROUND OF THE TECHNOLOGY
3.1 FIELD OF THE TECHNOLOGY
The present technology relates to one or more of the diagnosis, treatment
and amelioration of respiratory disorders, and to procedures to prevent respiratory
disorders. In particular, the present technology relates to medical devices, and their use
for treating respiratory disorders and for preventing respiratory disorders.
3.2 DESCRIPTION OF THE RELATED ART
The respiratory system of the body facilitates gas exchange. The nose and
mouth form the entrance to the airways of a patient.
The airways include a series of branching tubes, which become narrower,
shorter and more numerous as they penetrate deeper into the lung. The prime function of
the lung is gas exchange, allowing oxygen to move from the air into the venous blood
and carbon dioxide to move out. The trachea divides into right and left main bronchi,
which further divide eventually into terminal bronchioles. The bronchi make up the
conducting airways, and do not take part in gas exchange. Further divisions of the
airways lead to the respiratory bronchioles, and eventually to the alveoli. The alveolated
region of the lung is where the gas exchange takes place, and is referred to as the
respiratory zone. See West, Respiratory Physiology- the essentials.
A range of respiratory disorders exist.
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Obstructive Sleep Apnea (OSA), a form of Sleep Disordered Breathing
(SDB), is characterized by occlusion or obstruction of the upper air passage during
sleep. It results from a combination of an abnormally small upper airway and the normal
loss of muscle tone in the region of the tongue, soft palate and posterior oropharyngeal
wall during sleep. The condition causes the affected patient to stop breathing for periods
typically of 30 to 120 seconds duration, sometimes 200 to 300 times per night. It often
causes excessive daytime somnolence, and it may cause cardiovascular disease and
brain damage. The syndrome is a common disorder, particularly in middle aged
overweight males, although a person affected may have no awareness of the problem.
See US Patent 4,944,310 (Sullivan).
Cheyne-Stokes Respiration (CSR) is a disorder of a patient's respiratory
controller in which there are rhythmic alternating periods of waxing and waning
ventilation, causing repetitive de-oxygenation and re-oxygenation of the arterial blood.
It is possible that CSR is harmful because of the repetitive hypoxia. In some patients
CSR is associated with repetitive arousal from sleep, which causes severe sleep
disruption, increased sympathetic activity, and increased afterload. See US Patent
6,532,959 (Berthon-Jones).
Obesity Hyperventilation Syndrome (OHS) is defined as the combination
of severe obesity and awake chronic hypercapnia, in the absence of other known causes
for hypoventilation. Symptoms include dyspnea, morning headache and excessive
daytime sleepiness.
Chronic Obstructive Pulmonary Disease (COPD) encompasses any of a
group of lower airway diseases that have certain characteristics in common. These
include increased resistance to air movement, extended expiratory phase of respiration,
and loss of the normal elasticity of the lung. Examples of COPD are emphysema and
chronic bronchitis. COPD is caused by chronic tobacco smoking (primary risk factor),
occupational exposures, air pollution and genetic factors. Symptoms include: dyspnea
on exertion, chronic cough and sputum production.
Neuromuscular Disease (NMD) is a broad term that encompasses many
diseases and ailments that impair the functioning of the muscles either directly via
intrinsic muscle pathology, or indirectly via nerve pathology. Some NMD patients are
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characterised by progressive muscular impairment leading to loss of ambulation, being
wheelchair-bound, swallowing difficulties, respiratory muscle weakness and,
eventually, death from respiratory failure. Neuromuscular disorders can be divided into
rapidly progressive and slowly progressive: (i) Rapidly progressive disorders:
Characterised by muscle impairment that worsens over months and results in death
within a few years (e.g. Amyotrophic lateral sclerosis (ALS) and Duchenne muscular
dystrophy (DMD) in teenagers); (ii) Variable or slowly progressive disorders:
Characterised by muscle impairment that worsens over years and only mildly reduces
life expectancy (e.g. Limb girdle, Facioscapulohumeral and Myotonic muscular
dystrophy). Symptoms of respiratory failure in NMD include: increasing generalised
weakness, dysphagia, dyspnea on exertion and at rest, fatigue, sleepiness, morning
headache, and difficulties with concentration and mood changes.
Chest wall disorders are a group of thoracic deformities that result in
inefficient coupling between the respiratory muscles and the thoracic cage. The
disorders are usually characterised by a restrictive defect and share the potential of long
term hypercapnic respiratory failure. Scoliosis and/or kyphoscoliosis may cause severe
respiratory failure. Symptoms of respiratory failure include: dyspnea on exertion,
peripheral oedema, orthopnea, repeated chest infections, morning headaches, fatigue,
poor sleep quality and loss of appetite.
Otherwise healthy individuals may take advantage of systems and devices
to prevent respiratory disorders from arising.
3.2.1 Systems
One known product used for treating sleep disordered breathing is the S9
Sleep Therapy System, manufactured by ResMed.
3.2.2 Therapy
Nasal Continuous Positive Airway Pressure (CPAP) therapy has been
used to treat Obstructive Sleep Apnea (OSA). The hypothesis is that continuous positive
airway pressure acts as a pneumatic splint and may prevent upper airway occlusion by
pushing the soft palate and tongue forward and away from the posterior oropharyngeal
wall.
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Non-invasive ventilation (NIV) has been used to treat OHS, COPD, MD
and Chest Wall disorders.
3.2.3 Patient Interface
The application of a supply of air at positive pressure to the entrance of
the airways of a patient is facilitated by the use of a patient interface, such as a nasal
mask, full-face mask or nasal pillows. A range of patient interface devices are known,
however a number of them suffer from being one or more of obtrusive, aesthetically
undesirable, poorly fitting, difficult to use and uncomfortable especially when worn for
long periods of time or when a patient is unfamiliar with a system. Masks designed
solely for aviators, as part of personal protection equipment or for the administration of
anaesthetics may be tolerable for their original application, but nevertheless be
undesirably uncomfortable to be worn for extended periods, for example, while
sleeping.
3.2.3.1 Seal-forming portion
Patient interfaces typically include a seal-forming portion.
One type of seal-forming portion extends around the periphery of the
patient interface, and is intended to seal against the user's face when force is applied to
the patient interface with the seal-forming portion in confronting engagement with the
user's face. The seal-forming portion may include an air or fluid filled cushion, or a
moulded or formed surface of a resilient seal element made of an elastomer such as a
rubber. With this type of seal-forming portion, if the fit is not adequate, there will be
gaps between the seal-forming portion and the face, and additional force will be
required to force the patient interface against the face in order to achieve a seal.
Another type of seal-forming portion incorporates a flap seal of thin
material so positioned about the periphery of the mask so as to provide a self-sealing
action against the face of the user when positive pressure is applied within the mask.
Like the previous style of seal forming portion, if the match between the face and the
mask is not good, additional force may be required to effect a seal, or the mask may
leak. Furthermore, if the shape of the seal-forming portion does not match that of the
patient, it may crease or buckle in use, giving rise to leaks.
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Another form of seal-forming portion may use adhesive to effect a seal.
Some patients may find it inconvenient to constantly apply and remove an adhesive to
their face.
A range of patient interface seal-forming portion technologies are
disclosed in the following patent applications, assigned to ResMed Limited: WO
1998/004,310; ,513; ,785.
3.2.3.2 Positioning and stabilising
A seal-forming portion of a patient interface used for positive air pressure
therapy is subject to the corresponding force of the air pressure to disrupt a seal. Thus a
variety of techniques have been used to position the seal-forming portion, and to
maintain it in sealing relation with the appropriate portion of the face.
One technique is the use of adhesives. See for example US Patent
publication US 2010/0000534.
Another technique is the use of one or more straps and stabilising
harnesses. Many such harnesses suffer from being one or more of ill-fitting, bulky,
uncomfortable and awkward to use.
3.2.3.3 Vent technologies
Some forms of patient interface systems may include a vent to allow the
washout of exhaled carbon dioxide. Many such vents are noisy. Others may block in use
and provide insufficient washout. Some vents may be disruptive of the sleep of a bed-
partner 1100 of the patient 1000, e.g. through noise or focussed airflow.
ResMed Limited has developed a number of improved mask vent
technologies. See ,665; ,381; US 6,581,594; US Patent
Application; US 2009/0050156; US Patent Application 2009/0044808.
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Table of noise of prior masks (ISO 17510-2:2007, 10 cmH O pressure at
Mask name Mask type A-weighted A-weighted Year (approx.)
sound power sound pressure
level dbA dbA
(uncertainty) (uncertainty)
Glue-on (*) nasal 50.9 42.9 1981
ResCare nasal 31.5 23.5 1993
standard (*)
ResMed nasal 29.5 21.5 1998
Mirage (*)
ResMed nasal 36 (3) 28 (3) 2000
UltraMirage
ResMed nasal 32 (3) 24 (3) 2002
Mirage Activa
ResMed nasal 30 (3) 22 (3) 2008
Mirage Micro
ResMed nasal 29 (3) 22 (3) 2008
Mirage SoftGel
ResMed nasal 26 (3) 18 (3) 2010
Mirage FX
ResMed nasal pillows 37 29 2004
Mirage Swift
ResMed nasal pillows 28 (3) 20 (3) 2005
Mirage Swift II
ResMed nasal pillows 25 (3) 17 (3) 2008
Mirage Swift
(* one specimen only, measured using test method specified in ISO3744
in CPAP mode at 10cmH O)
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Sound pressure values of a variety of objects are listed below
Object A-weighted sound pressure dbA Notes
(uncertainty)
Vacuum cleaner: Nilfisk 68 ISO3744 at 1m
Walter Broadly Litter Hog: B+ distance
Grade
Conversational speech 60 1m distance
Average home 50
Quiet library 40
Quiet bedroom at night 30
Background in TV studio 20
3.2.3.4 Nasal pillow technologies
One form of nasal pillow is found in the Adam Circuit manufactured by
Puritan Bennett. Another nasal pillow, or nasal puff is the subject of US Patent
4,782,832 (Trimble et al.), assigned to Puritan-Bennett Corporation.
ResMed Limited has manufactured the following products that
incorporate nasal pillows: SWIFT nasal pillows mask, SWIFT II nasal pillows mask,
SWIFT LT nasal pillows mask, SWIFT FX nasal pillows mask and LIBERTY full-face
mask. The following patent applications, assigned to ResMed Limited, describe nasal
pillows masks: International Patent Application WO2004/073,778 (describing amongst
other things aspects of ResMed SWIFT nasal pillows), US Patent Application
2009/0044808 (describing amongst other things aspects of ResMed SWIFT LT nasal
pillows); International Patent Applications ,328 and ,903
(describing amongst other things aspects of ResMed LIBERTY full-face mask);
International Patent Application ,560 (describing amongst other things
aspects of ResMed SWIFT FX nasal pillows).
[31A] It is an object of the present invention to address at least one of the
disadvantages of the prior art, or to at least provide a useful choice.
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4 BRIEF SUMMARY OF THE TECHNOLOGY
[31B] Preferred aspects of the invention are set forth in the appended claims.
Particular embodiments are described below in non-limiting terms.
The present technology is directed towards providing medical devices
used in the diagnosis, amelioration, treatment, or prevention of respiratory disorders
having one or more of improved comfort, cost, efficacy, ease of use and
manufacturability.
A first embodiment of the present technology relates to apparatus used in
the diagnosis, amelioration, treatment or prevention of a respiratory disorder.
Another embodiment of the present technology is directed to a patient
interface system to treat a respiratory disorder of a patient. The patient interface system
may comprise: a positioning and stabilising structure including a back portion and a pair
of upper straps extending from the back portion; and a patient interface including a
patient interface frame and a pair of rigidiser arms each connected to the patient
interface frame at a connection point located in a plane substantially parallel to the
patient’s Frankfort horizontal plane, the pair of rigidiser arms further including a pair of
upper attachment points, wherein the pair of upper straps are adapted to be releasably
attached to the pair of upper attachment points such that, when donned by the patient,
the pair of upper straps are vertically offset relative to the upper attachment points and
substantially parallel to the patient’s Frankfort horizontal plane, and wherein the patient
interface does not include a forehead support.
In examples, (a) the patient interface may further comprise a plenum
chamber and a seal-forming structure, (b) the plenum chamber and the seal-forming
structure may comprise one piece, (c) the plenum chamber may comprise a more rigid
material than the seal-forming structure, (d) the plenum chamber may comprise
polycarbonate and the seal-forming structure may comprise silicone, (e) the plenum
chamber may comprise at least one plenum chamber retention feature, (f) the mask
frame may comprise at least one mask frame retention feature each configured to
releasably attach the mask frame to the plenum chamber by a releasable connection with
a corresponding one of the at least one plenum chamber retention feature, (g) the
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plenum chamber may comprise four plenum chamber retention features and the mask
frame may comprise four corresponding mask frame retention features, (h) the mask
frame and the plenum chamber may be releasably attachable by a hard-to-hard
connection, (i) the mask frame may be releasably connected to the plenum chamber
about a periphery of the plenum chamber, (j) the positioning and stabilising structure
may comprise a pair of lower straps and the patient interface frame may comprise a pair
of lower attachment points for releasable attachment to a respective lower strap, and
each of the pair of upper straps and each of the pair of lower straps may comprise a loop
portion of loop material, (k) a hook portion comprising hook material may be attached
at a distal end of each of the pair of upper straps and each of the pair of lower straps, (l)
each of the pair of upper straps and each of the pair of lower straps may be adapted to be
looped around a respective one of the pair of upper attachment points and the pair of
lower attachment points such that each respective strap’s hook portion is realasably
attachable to that strap’s loop portion, (m) each loop portion may be wider than each
respective hook portion such that when each hook portion is attached to its
corresponding loop portion the loop portion shields the patient’s skin from the hook
portion, (n) the patient interface may comprise a full-face mask, (o) the positioning and
stabilising structure may comprise a crown strap to engage with the parietal bone of the
patient’s skull, and/or (p) the positioning and stabilising structure may comprise a neck
piece to engage with the occipital bone of the patient’s skull.
Another embodiment of the present technology is directed to a patient
interface system to treat a respiratory disorder of a patient. The patient interface system
may comprise: a positioning and stabilising structure including a back portion and a pair
of upper straps extending from the back portion; and a patient interface including a
patient interface frame and a pair of rigidiser arms each connected to the patient
interface frame at a connection point located in a plane substantially parallel to the
patient’s Frankfort horizontal plane, the pair of rigidiser arms further including a pair of
upper attachment points, wherein the pair of upper straps are adapted to be releasably
attached to the pair of upper attachment points such that, when donned by the patient,
sealing force vectors generated by the pair of upper straps are vertically offset relative to
the upper attachment points and substantially parallel to the patient’s Frankfort
horizontal plane, and wherein the patient interface does not include a forehead support.
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In examples, (a) the patient interface may further comprise a plenum
chamber and a seal-forming structure, (b) the plenum chamber and the seal-forming
structure may comprise one piece, (c) the plenum chamber may comprise a more rigid
material than the seal-forming structure, (d) the plenum chamber may comprise
polycarbonate and the seal-forming structure may comprise silicone, (e) the plenum
chamber may comprise at least one plenum chamber retention feature, (f) the mask
frame may comprise at least one mask frame retention feature each configured to
releasably attach the mask frame to the plenum chamber by a releasable connection with
a corresponding one of the at least one plenum chamber retention feature, (g) the
plenum chamber may comprise four plenum chamber retention features and the mask
frame may comprise four corresponding mask frame retention features, (h) the mask
frame and the plenum chamber may be releasably attachable by a hard-to-hard
connection, (i) the mask frame may be releasably connected to the plenum chamber
about a periphery of the plenum chamber, (j) the positioning and stabilising structure
may comprise a pair of lower straps and the patient interface frame may comprise a pair
of lower attachment points for releasable attachment to a respective lower strap, and
each of the pair of upper straps and each of the pair of lower straps may comprise a loop
portion of loop material, (k) a hook portion comprising hook material may be attached
at a distal end of each of the pair of upper straps and each of the pair of lower straps, (l)
each of the pair of upper straps and each of the pair of lower straps may be adapted to be
looped around a respective one of the pair of upper attachment points and the pair of
lower attachment points such that each respective strap’s hook portion is realasably
attachable to that strap’s loop portion, (m) each loop portion may be wider than each
respective hook portion such that when each hook portion is attached to its
corresponding loop portion the loop portion shields the patient’s skin from the hook
portion, (n) the patient interface may comprise a full-face mask, (o) the positioning and
stabilising structure may comprise a crown strap to engage with the parietal bone of the
patient’s skull, and/or (p) the positioning and stabilising structure may comprise a neck
piece to engage with the occipital bone of the patient’s skull.
Another embodiment of the present technology is directed to a patient
interface system to treat a respiratory disorder of a patient. The patient interface system
may comprise: a patient interface; a positioning and stabilising structure including a pair
of upper straps; and a patient interface frame to connect the patient interface to the
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positioning and stabilising structure, the patient interface frame including a pair of
rigidiser arms with upper attachment points to releasably attach the pair of upper straps,
wherein each rigidiser arm is connected to the patient interface frame at a connection
point such that each rigidiser arm is rotatable about an axis that is substantially
perpendicular to the patient’s Frankfort horizontal plane, and wherein, when donned by
the patient, the pair of upper straps are substantially parallel to the patient’s Frankfort
horizontal.
In examples, (a) the patient interface may further comprise a plenum
chamber and a seal-forming structure, (b) the plenum chamber and the seal-forming
structure may comprise one piece, (c) the plenum chamber may comprise a more rigid
material than the seal-forming structure, (d) the plenum chamber may comprise
polycarbonate and the seal-forming structure may comprise silicone, (e) the plenum
chamber may comprise at least one plenum chamber retention feature, (f) the mask
frame may comprise at least one mask frame retention feature each configured to
releasably attach the mask frame to the plenum chamber by a releasable connection with
a corresponding one of the at least one plenum chamber retention feature, (g) the
plenum chamber may comprise four plenum chamber retention features and the mask
frame may comprise four corresponding mask frame retention features, (h) the mask
frame and the plenum chamber may be releasably attachable by a hard-to-hard
connection, (i) the mask frame may be releasably connected to the plenum chamber
about a periphery of the plenum chamber, (j) the patient interface may comprise a full-
face mask, (k) the patient interface may not include a forehead support, (l) a patient
interface system to treat a respiratory disorder of a patient may comprise: a patient
interface according to any one of the examples above and further comprising a pair of
upper attachment points each located on one of the pair of rigidiser arms and a pair of
lower attachment points located on the mask frame; and a positioning and stabilising
structure including a back portion, a pair of upper straps extending from the back
portion, and a pair of lower straps extending from the back portion, (m) each of the pair
of upper straps and each of the pair of lower straps may comprise a loop portion of loop
material, (n) a hook portion comprising hook material may be attached at a distal end of
each of the pair of upper straps and each of the pair of lower straps, (o) each of the pair
of upper straps and each of the pair of lower straps may be adapted to be looped around
a respective one of the pair of upper attachment points and the pair of lower attachment
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points such that each respective strap’s hook portion is realasably attachable to that
strap’s loop portion, (p) each loop portion may be wider than each respective hook
portion such that when each hook portion is attached to its corresponding loop portion
the loop portion shields the patient’s skin from the hook portion, (q) the positioning and
stabilising structure may comprise a crown strap to engage with the parietal bone of the
patient’s skull, and/or (r) the positioning and stabilising structure may comprise a neck
piece to engage with the occipital bone of the patient’s skull.
Another embodiment of the present technology is directed to a patient
interface to treat a respiratory disorder of a patient. The patient interface may comprise:
a patient interface; a patient interface frame to connect the patient interface to a
positioning and stabilising structure, the patient interface frame including a pair of
frame connection features; and a pair of rigidiser arms, each having a rigidiser arm
connection feature, wherein the rigidiser arms are connected to the patient interface
frame at connection points by direct engagement between respective frame connection
features and rigidiser arm connection features, the connection points being encapsulated
by a flexible material.
In examples, (a) the patient interface may further comprise a plenum
chamber and a seal-forming structure, (b) the plenum chamber and the seal-forming
structure may comprise one piece, (c) the plenum chamber may comprise a more rigid
material than the seal-forming structure, (d) the plenum chamber may comprise
polycarbonate and the seal-forming structure may comprise silicone, (e) the plenum
chamber may comprise at least one plenum chamber retention feature, (f) the mask
frame may comprise at least one mask frame retention feature each configured to
releasably attach the mask frame to the plenum chamber by a releasable connection with
a corresponding one of the at least one plenum chamber retention feature, (g) the
plenum chamber may comprise four plenum chamber retention features and the mask
frame may comprise four corresponding mask frame retention features, (h) the mask
frame and the plenum chamber may be releasably attachable by a hard-to-hard
connection, (i) the mask frame may be releasably connected to the plenum chamber
about a periphery of the plenum chamber, (j) the patient interface may comprise a full-
face mask, (k) the patient interface may not include a forehead support, (l) a patient
interface system to treat a respiratory disorder of a patient may comprise: a patient
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interface according to any one of the examples above and further comprising a pair of
upper attachment points each located on one of the pair of rigidiser arms and a pair of
lower attachment points located on the mask frame; and a positioning and stabilising
structure including a back portion, a pair of upper straps extending from the back
portion, and a pair of lower straps extending from the back portion, (m) each of the pair
of upper straps and each of the pair of lower straps may comprise a loop portion of loop
material, (n) a hook portion comprising hook material may be attached at a distal end of
each of the pair of upper straps and each of the pair of lower straps, (o) each of the pair
of upper straps and each of the pair of lower straps may be adapted to be looped around
a respective one of the pair of upper attachment points and the pair of lower attachment
points such that each respective strap’s hook portion is realasably attachable to that
strap’s loop portion, (p) each loop portion may be wider than each respective hook
portion such that when each hook portion is attached to its corresponding loop portion
the loop portion shields the patient’s skin from the hook portion, (q) the positioning and
stabilising structure may comprise a crown strap to engage with the parietal bone of the
patient’s skull, and/or (r) the positioning and stabilising structure may comprise a neck
piece to engage with the occipital bone of the patient’s skull.
Another embodiment of the present technology is directed to a patient
interface system to treat a respiratory disorder of a patient. The patient interface may
comprise: a patient interface; a positioning and stabilising structure including a back
portion and a pair of upper straps extending from the back portion; and a mask frame for
retaining the patient interface against the patient’s airways, the mask frame including a
pair of rigidiser arms including a pair of upper attachment points each located on one of
the pair of rigidiser arms for releasable attachment to a respective upper strap, wherein
when the patient interface system is donned by the patient the rigidisers arm are shaped
and dimensioned to extend from the mask frame along the patient’s cheeks and between
the patient’s eyes and ears such that each upper strap is connectable to a respective
upper attachment point above the ears of the patient.
In examples, (a) the patient interface may further comprise a plenum
chamber and a seal-forming structure, (b) the plenum chamber and the seal-forming
structure may comprise one piece, (c) the plenum chamber may comprise a more rigid
material than the seal-forming structure, (d) the plenum chamber may comprise
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polycarbonate and the seal-forming structure may comprise silicone, (e) the plenum
chamber may comprise at least one plenum chamber retention feature, (f) the mask
frame may comprise at least one mask frame retention feature each configured to
releasably attach the mask frame to the plenum chamber by a releasable connection with
a corresponding one of the at least one plenum chamber retention feature, (g) the
plenum chamber may comprise four plenum chamber retention features and the mask
frame may comprise four corresponding mask frame retention features, (h) the mask
frame and the plenum chamber may be releasably attachable by a hard-to-hard
connection, (i) the mask frame may be releasably connected to the plenum chamber
about a periphery of the plenum chamber, (j) each of the pair of upper straps and each of
the pair of lower straps may comprise a loop portion of loop material, (k) a hook portion
comprising hook material may be attached at a distal end of each of the pair of upper
straps and each of the pair of lower straps, (l) each of the pair of upper straps and each
of the pair of lower straps may be adapted to be looped around a respective one of the
pair of upper attachment points and the pair of lower attachment points such that each
respective strap’s hook portion is realasably attachable to that strap’s loop portion, (m)
each loop portion may be wider than each respective hook portion such that when each
hook portion is attached to its corresponding loop portion the loop portion shields the
patient’s skin from the hook portion, (n) the patient interface may comprise a full-face
mask, (o) the patient interface may not include a forehead support, (p) the positioning
and stabilising structure may comprise a crown strap to engage with the parietal bone of
the patient’s skull, and/or (q) the positioning and stabilising structure may comprise a
neck piece to engage with the occipital bone of the patient’s skull.
Another embodiment of the present technology is directed to a patient
interface system, comprising: a patient interface having a plenum chamber and a seal-
forming structure; a positioning and stabilising structure; and a connection points for
attaching the positioning and stabilising structure to the patient interface.
In examples, (a) the plenum chamber and the seal-forming structure may
be one-piece, e.g., permanently connected, integrally molded, and/or joined by
comolding, (b) the plenum chamber and the seal-forming structure may be removably
attached, e.g., by a clipping mechanism, a snap-fit, a press-fit, and/or a friction fit, (c)
the patient interface system may further comprise a patient interface frame, wherein the
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connection points are formed on the patient interface frame, and wherein the patient
interface frame is removably attachable to the plenum chamber, (d) the connection
points may be formed integrally with or formed in one piece with or molded to the
plenum chamber, and/or (e) the positioning and stabilising structure may include upper
and lower side straps that join the positioning and stabilising structure to the patient
interface at the connection points to releasably secure the patient interface system on the
patient’s head.
Of course, portions of the examples or aspects may form sub-aspects or
sub-examples of the present technology. Also, various ones of the examples, sub-
aspects and/or aspects may be combined in various manners and also constitute
additional examples, sub-examples, aspects or sub-aspects of the present technology.
Other features of the technology will be apparent from consideration of
the information contained in the following detailed description, abstract, drawings and
claims.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE
DRAWINGS
The present technology is illustrated by way of example, and not by way
of limitation, in the figures of the accompanying drawings, in which like reference
numerals refer to similar elements including:
.1 TREATMENT SYSTEMS
Fig. 1a shows a system in accordance with the present technology. A
patient 1000 wearing a patient interface 3000, receives a supply of air at positive
pressure from a PAP device 4000. Air from the PAP device is humidified in a
humidifier 5000, and passes along an air circuit 4170 to the patient 1000.
.2 THERAPY
.2.1 Respiratory system
Fig. 2a shows an overview of a human respiratory system including the
nasal and oral cavities, the larynx, vocal folds, oesophagus, trachea, bronchus, lung,
alveolar sacs, heart and diaphragm.
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Fig. 2b shows a view of a human upper airway including the nasal cavity,
nasal bone, lateral nasal cartilage, greater alar cartilage, nostril, lip superior, lip inferior,
larynx, hard palate, soft palate, oropharynx, tongue, epiglottis, vocal folds, oesophagus
and trachea.
.2.2 Facial anatomy
Fig. 2c is a front view of a face with several features of surface anatomy
identified including the lip superior, upper vermillion, lower vermillion, lip inferior,
mouth width, endocanthion, a nasal ala, nasolabial sulcus and cheilion.
Fig. 2d is a side view of a head with several features of surface anatomy
identified including glabella, sellion, pronasale, subnasale, lip superior, lip inferior,
supramenton, nasal ridge, otobasion superior and otobasion inferior. Also indicated are
the directions superior & inferior, and anterior & posterior.
Fig. 2e is a further side view of a head. The approximate locations of the
Frankfort horizontal and nasolabial angle are indicated.
Fig. 2f shows a base view of a nose.
Fig. 2g shows a side view of the superficial features of a nose .
Fig. 2h shows subcutaneal structures of the nose, including lateral
cartilage, septum cartilage, greater alar cartilage, lesser alar cartilage and fibrofatty
tissue.
Fig. 2i shows a medial dissection of a nose, approximately several
millimeters from a sagittal plane, amongst other things showing the septum cartilage
and medial crus of greater alar cartilage.
Fig. 2j shows a front view of the bones of a skull including the frontal,
temporal, nasal and zygomatic bones. Nasal concha are indicated, as are the maxilla,
mandible and mental protuberance.
Fig. 2k shows a lateral view of a skull with the outline of the surface of a
head, as well as several muscles. The following bones are shown: frontal, sphenoid,
nasal, zygomatic, maxilla, mandible, parietal, temporal and occipital. The mental
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protuberance is indicated. The following muscles are shown: digastricus, masseter
sternocleidomastoid and trapezius.
Fig. 2l shows an anterolateral view of a nose.
.3 PATIENT INTERFACE
Fig. 3 shows a perspective view of a positioning and stabilising structure
in accordance with one form of the present technology.
Fig. 4a shows a rear view of a positioning and stabilising structure
assembly laid out flat in accordance with one form of the present technology.
Fig. 4b shows a rear view of a bottom strap assembly of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4c shows a top view of a bottom strap assembly of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4d shows a rear view of an upper right strap assembly of a
positioning and stabilising structure assembly in accordance with one form of the
present technology.
Fig. 4e shows a top view of an upper right strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 4f shows a rear view of an upper left strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 4g shows a top view of an upper left strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 4h shows a rear view of a neck piece of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
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Fig. 4i shows a top view of a neck piece of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 4j shows a rear view of a lower strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 4k shows a top view of a lower strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 4l shows a rear view of a right crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4m shows a top view of a right crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4n shows a detailed rear view of a right crown piece of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 4o shows a rear view of a left crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4p shows a top view of a left crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4q shows a detailed rear view of a left crown piece of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 4r shows a rear view of an upper right strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4s shows a top view of an upper right strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4t shows a rear view of an upper left strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
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Fig. 4u shows a top view of an upper left strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4v shows a rear view of a crown strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 4w shows a top view of a crown strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 4x shows a detailed rear view of a crown strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4y shows a rear view of a hook portion of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 4z shows a top view of a hook portion of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 4z1 shows a rear view of a hook portion of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 5a shows a rear view of a positioning and stabilising structure
assembly laid out flat in accordance with one form of the present technology.
Fig. 5b shows a rear view of an upper right strap assembly of a
positioning and stabilising structure assembly in accordance with one form of the
present technology.
Fig. 5c shows a top view of an upper right strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 5d shows a rear view of an upper left strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
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Fig. 5e shows a top view of an upper left strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 5f shows a rear view of an upper right strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 5g shows a top view of an upper right strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 5h shows a rear view of an upper left strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 5i shows a top view of an upper left strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 5j shows a rear view of a crown strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 5k shows a top view of a crown strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 5l shows a detailed rear view of a crown strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6a shows a rear view of a positioning and stabilising structure
assembly laid out flat in accordance with one form of the present technology.
Fig. 6b shows a rear view of a lower strap assembly of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6c shows a top view of a lower strap assembly of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6d shows a rear view of an upper right strap assembly of a
positioning and stabilising structure assembly in accordance with one form of the
present technology.
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Fig. 6e shows a top view of an upper right strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 6f shows a rear view of an upper left strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 6g shows a top view of an upper left strap assembly of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 6h shows a rear view of a lower strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 6i shows a top view of a lower strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 6j shows a rear view of a right crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6k shows a top view of a right crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6l shows a detailed rear view of a right crown piece of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
Fig. 6m shows a rear view of a left crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6n shows a top view of a left crown piece of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6o shows a detailed rear view of a left crown piece of a positioning
and stabilising structure assembly in accordance with one form of the present
technology.
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Fig. 6p shows a rear view of an upper right strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6q shows a top view of an upper right strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6r shows a rear view of an upper left strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6s shows a top view of an upper left strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 6t shows a rear view of a crown strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 6u shows a top view of a crown strap of a positioning and stabilising
structure assembly in accordance with one form of the present technology.
Fig. 6v shows a detailed rear view of a crown strap of a positioning and
stabilising structure assembly in accordance with one form of the present technology.
Fig. 7a shows a bottom perspective view of a patient interface frame in
accordance with one form of the present technology.
Fig. 7b shows a front view of a patient interface frame in accordance with
one form of the present technology.
Fig. 7c shows a bottom view of a patient interface frame in accordance
with one form of the present technology.
Fig. 7d shows an inner cross-sectional view of a patient interface frame
taken through line 7d-7d of Fig. 7b in accordance with one form of the present
technology.
Fig. 7e shows an outer cross-sectional view of a patient interface frame
taken through line 7d-7d of Fig. 7b in accordance with one form of the present
technology.
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Fig. 7f shows a front view of a left rigidiser arm in accordance with one
form of the present technology.
Fig. 7g shows a bottom view of a left rigidiser arm in accordance with one
form of the present technology.
Fig. 7h shows a front view of a right rigidiser arm in accordance with one
form of the present technology.
Fig. 7i shows a bottom view of a right rigidiser arm in accordance with
one form of the present technology.
Fig. 7j shows a perspective view of a patient interface frame assembly in
accordance with one form of the present technology.
Fig. 7k shows a front view of a patient interface frame with rigidiser arms
in accordance with one form of the present technology.
Fig. 7l shows an inner cross-sectional view of a patient interface frame
taken through line 7l-7l of Fig. 7k in accordance with one form of the present
technology.
Fig. 7m shows an outer cross-sectional view of a patient interface frame
taken through line 7l-7l of Fig. 7k in accordance with one form of the present
technology.
Fig. 7n shows a detailed view of a hook of an attachment point of a patient
interface frame in accordance with one form of the present technology.
Fig. 7o shows a cross-sectional view of a patient interface frame taken
through line 7o-7o of Fig. 7k in accordance with one form of the present technology.
Fig. 7p shows a cross-sectional view of a patient interface frame taken
through line 7p-7p of Fig. 7k in accordance with one form of the present technology.
Fig. 8a shows a front view of a patient interface and a positioning and
stabilising structure donned on a patient in accordance with one form of the present
technology.
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Fig. 8b shows a detailed side view of a patient interface and a positioning
and stabilising structure donned on a patient in accordance with one form of the present
technology.
Fig. 8c shows a side view of a patient interface and a positioning and
stabilising structure donned on a patient in accordance with one form of the present
technology.
Fig. 9 shows a comparison of a positioning and stabilising structure laid
out flat according to the present technology with a related art positioning and stabilising
structure also laid out flat.
Fig. 10a shows a side view of measurements of a patient’s head and face.
Fig. 10b shows a side view of measurements of a patient’s head and face.
Fig. 11 shows a perspective view of a patient interface and positioning
and stabilising structure according to one form of the present technology.
Fig. 12 shows a perspective view of a patient interface and positioning
and stabilising structure according to one form of the present technology.
Fig. 13 shows a perspective view of a rigidiser arm according to one form
of the present technology.
Fig. 14 shows a perspective view of a patient interface frame and a pair of
rigidiser arms according to an example of the present technology.
Fig. 15 shows a front view of a patient interface frame and a pair of
rigidiser arms according to an example of the present technology.
Fig. 16 shows a rear view of a patient interface frame and a pair of
rigidiser arms according to an example of the present technology.
Fig. 17 shows a top view of a patient interface frame and a pair of
rigidiser arms according to an example of the present technology.
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Fig. 18 shows a bottom view of a patient interface frame and a pair of
rigidiser arms according to an example of the present technology.
Fig. 19 shows a side view of a plenum chamber of a patient interface
according to an example of the present technology.
Fig. 20 shows side view of a seal-forming structure of a patient interface
according to an example of the present technology.
Fig. 21 shows a side of a patient interface according to an example of the
present technology.
Fig. 22 shows a perspective view of a patient interface and a positioning
and stabilising structure according to an example of the present technology.
Fig. 23 shows a front view of a patient interface and a positioning and
stabilising structure according to an example of the present technology.
6 DETAILED DESCRIPTION OF EXAMPLES OF THE
TECHNOLOGY
Before the present technology is described in further detail, it is to be
understood that the technology is not limited to the particular examples described
herein, which may vary. It is also to be understood that the terminology used in this
disclosure is for the purpose of describing only the particular examples discussed herein,
and is not intended to be limiting.
The following description is provided in relation to various examples
which may share one or more common characteristics and/or features. It is to be
understood that one or more features of any one example may be combinable with one
or more features of another example or other examples. In addition, any single feature
or combination of features in any of the examples may constitute a further example.
6.1 TREATMENT SYSTEMS
In one form, the present technology comprises apparatus for treating a
respiratory disorder. The apparatus may comprise a flow generator or blower for
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supplying pressurised respiratory gas, such as air, to the patient 1000 via an air delivery
tube leading to a patient interface 3000.
6.2 THERAPY
In one form, the present technology comprises a method for treating a
respiratory disorder comprising the step of applying positive pressure to the entrance of
the airways of a patient 1000.
6.2.1 Nasal CPAP for OSA
In one form, the present technology comprises a method of treating
Obstructive Sleep Apnea in a patient by applying nasal continuous positive airway
pressure to the patient.
In certain examples of the present technology, a supply of air at positive
pressure is provided to the nasal passages of the patient via one or both nares.
In certain examples of the present technology, mouth breathing is limited,
restricted or prevented.
6.3 PATIENT INTERFACE
A non-invasive patient interface 3000 in accordance with one aspect of
the present technology comprises the following functional aspects: a seal-forming
structure 3100, a plenum chamber 3200, a positioning and stabilising structure 3300 and
a connection port 3600 for connection to air circuit 4170. In some forms a functional
aspect may be provided by one or more physical components. In some forms, one
physical component may provide one or more functional aspects. In use the seal-
forming structure 3100 is arranged to surround an entrance to the airways of the patient
so as to facilitate the supply of air at positive pressure to the airways.
The term “patient interface”, for the purposes of the present disclosure, is
intended to refer to various interface types such as a full face mask, a nasal mask, an
oro-nasal mask, nasal puffs or pillows, and/or an oro-nasal mask. In other words, any
device that facilitates an interface with an entrance to the patient’s airways for the
supply of pressurized breathable gas may be a “patient interface”. It should also be
understood that those skilled in the art would also understood the term “mask” to refer
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broadly to the various forms of patient interface described above. Thus, for example, a
mask may include a full face mask, a nasal mask, an oro-nasal mask, nasal puffs or
pillows, and/or an oro-nasal mask.
6.3.1 A Full-Face Mask Without A Forehead Support
According to an example of the present technology, a patient interface
3000 may be formed without a forehead support. An exemplary patient interface 3000
may also comprise a full-face mask. By excluding a forehead support from the patient
interface 3000 the patient may be provided with a less obstructed view due to the
absence of a structure extending upward toward the forehead and between the eyes. This
may also make the patient interface 3000 more visually appealing for a bed partner
because there is less structure obstructing the face. Additionally, the absence of a
forehead support reduces the points of contact on the patient’s face that are required by
the patient interface 3000. However, the patient interface 3000 must still be able to be
urged against the patient’s face with a force that is sufficient in magnitude and
distribution at the seal-forming structure 3100 so as to ensure an effective pneumatic
seal with the patient’s airways.
Also, a positioning and stabilising structure 3300 (described in greater
detail below) must be designed for use in conjunction with the patient interface 3000 to
prevent riding up of the patient interface. Ride up may be described as the upward
movement of the patient interface 3000 such that the patient interface comes to rest at a
higher position on the patient’s face than its initial position. If sealing force vectors
generated by upper straps of the positioning and stabilising structure 3300 are generated
in a vertical direction, then ride up may occur. Other factors, which will be described in
greater detail below, may also contribute to ride up.
6.3.1.1 Seal-Forming Structure and Plenum Chamber
According to an example of the present technology, the patient interface
3000 may include the seal-forming structure 3100 and the plenum chamber 3200.
Examples of the patient interface 3000 and associated features are depicted in Figs. 8a-
In one form of the present technology, a seal-forming structure 3100
provides a sealing-forming surface, and may additionally provide a cushioning function.
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A seal-forming structure 3100 in accordance with the present technology
may be constructed from a soft, flexible, resilient material such as silicone.
In one form, the seal-forming structure 3100 comprises a sealing flange
and a support flange. The sealing flange comprises a relatively thin member with a
thickness of less than about 1mm, for example about 0.25mm to about 0.45mm, that
extends around the perimeter of the plenum chamber 3200. The support flange may be
relatively thicker than the sealing flange. The support flange may be disposed between
the sealing flange and the marginal edge of the plenum chamber 3200, and extends at
least part of the way around the perimeter. The support flange may be or may include a
spring-like element and functions to support the sealing flange from buckling in use. In
use the sealing flange can readily respond to system pressure in the plenum chamber
3200 acting on its underside to urge it into tight sealing engagement with the face.
The plenum chamber 3200 may have a perimeter that is shaped to be
complementary to the surface contour of the face of an average person in the region
where a seal will form in use. In use, a marginal edge of the plenum chamber 3200 is
positioned in close proximity to an adjacent surface of the face. Actual contact with the
face is provided by the seal-forming structure 3100. The seal-forming structure 3100
may extend, in use, about the entire perimeter of the plenum chamber 3200.
According to an example of the present technology, the seal-forming
structure 3100 may be molded onto the plenum chamber 3200 to form one piece. The
seal-forming structure 3100 and the plenum chamber 3200 may comprise a patient
interface or a mask assembly according to an example of the present technology.
6.3.1.2 Positioning and Stabilising Structure
Figs. 3, 4a-4z1, 5a-5l, 6a-6v, 8a-8c, and 9 depict various examples of the
positioning and stabilising structure 3300 according to the present technology.
Fig. 3 shows a perspective view of the positioning and stabilising
structure 3300 according to an example of the technology. This view shows the
positioning and stabilising and structure 3300 as it may be worn by a patient, although
no patient interface 3000 is shown.
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The exemplary positioning and stabilising structure 3300 shown in Fig. 3
includes a back portion 3302. The exemplary back portion 3302 may include a left
crown piece 3306 and a right crown piece 3308, as well as a neck piece 3310. The
positioning and stabilising structure 3300 may also include a crown strap 3304. Also,
extending from the back portion 3302 may be an upper left strap 3312 and an upper
right strap 3314, as well as a lower left strap 3316 and a lower right strap 3318. A hook
portion 3320 of hook material may be attached at a distal end of each of the upper straps
3312, 3314 and lower straps 3316, 3318. The hook portion 3320 may be used to attach
each strap to itself by looping through attachment points of the patient interface, as will
be discussed in greater detail below. The connection with the hook portions 3320 may
be facilitated by a layer of loop material on the exterior of some or all of the
components of the positioning and stabilising structure 3300. According to one example
of the present technology, the upper straps 3312, 3314 and lower straps 3316, 3318 may
each have an exterior layer of hook material for releasable attachment with the
respective hook portions 3320.
According to another example of the present technology, each component
of the positioning and stabilising structure 3300 may also include an exterior layer of
loop material such that when the upper straps 3312, 3314 and the lower straps 3316,
3318 are looped back on themselves the hook portions 3320 can connect to parts of the
back portion. For example, the crown strap 3348, the left crown piece 3306, the right
crown piece 3308, and the neck piece 3310 may include an exterior layer of loop
material so that the hook portions 3320 may connect at the respective junctions between
the back portion 3302 components and the upper straps 3312, 3314 and the lower straps
3316, 3318.
Also, Fig. 3 shows how the hook portions 3320 may be relatively
narrower than their respective straps, as well as the components of the back portion
3302. This may be advantageous in that the straps and the back portion may shield the
user’s skin from contact with the hook portions thereby minimizing irritation and
discomfort. Furthermore, the components of the exemplary positioning and stabilising
structure 3300 may be connected to one another to assemble the positioning and
stabilising structure by ultrasonic welding. These features may be equally applicable to
the different sizes of positioning and stabilising structures discussed below.
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6.3.1.2.1 Varying Proportions for Different Size Positioning and Stabilising
Structures
Figs. 4a-4z1, 5a-5l, and 6a-6v show similar positioning and stabilising
structures as well as the individual components of the positioning and stabilising
structures. Each series of drawings shows a positioning and stabilising structure of a
different size. Thus, Figs. 4a-4z1 show an exemplary positioning and stabilising
structure 3340 and its individual components that are dimensioned to accommodate a
standard or medium size head. Figs. 5a-5l show an exemplary positioning and
stabilising structure 3350 and its individual components that are dimensioned to
accommodate a large size head. In other words, the patient wearing the positioning and
stabilising structure 3350 in these views will have a larger head than the patient wearing
the positioning and stabilising structure 3340 in Figs. 4a-4z1. Figs. 6a-6v show an
exemplary positioning and stabilising structure 3360 and its individual components that
are dimensioned to accommodate a small size head. In other words, the patient wearing
the positioning and stabilising structure 3360 in these views will have a smaller head
than the patient wearing the positioning and stabilising structure 3340 in Figs. 4a-4z1.
6.3.1.2.1.1 Standard Size
Figs. 4a-4z1 depict an example of a positioning and stabilising structure
3340 according to the present technology. The exemplary positioning and stabilising
structure 3340 shown in these Figures may include a back portion 3340.1. The
exemplary back portion 3340.1 may include a left crown piece 3345 and a right crown
piece 3342, as well as a neck piece 3343. The positioning and stabilising structure 3340
may also include a crown strap 3348. Also, extending from the back portion 3340.1 may
be an upper left strap 3346 and an upper right strap 3341, as well as a lower left strap
3344 and a lower right strap 3344. It should be understood that the lower straps of the
exemplary positioning and stabilising structure 3340 may be identical. A hook portion
3349 of hook material may be attached at a distal end of each of the upper straps 3346,
3341 and lower straps 3344. The hook portion 3349 may be used to attach each strap to
itself by looping through attachment points of the patient interface. The connection with
the hook portions 3349 may be facilitated by a layer of loop material on the exterior of
some or all of the components of the positioning and stabilising structure 3340.
According to one example of the present technology, the upper straps 3346, 3341 and
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lower straps 3344 may each have an exterior layer of hook material for releasable
attachment with the respective hook portions 3349.
According to another example of the present technology, each component
of the positioning and stabilising structure 3340 may also include an exterior layer of
loop material such that when the upper straps 3346, 3341 and the lower straps 3344 are
looped back on themselves the hook portions 3349 can connect to parts of the back
portion. For example, the crown strap 3348, the left crown piece 3345, the right crown
piece 3342, and the neck piece 3343 may include an exterior layer of loop material so
that the hook portions 3349 may connect at the respective junctions between the back
portion 3340.1 components and the upper straps 3346, 3341 and the lower straps 3344.
Also, as discussed above, the hook portions 3349 may be relatively
narrower than their respective straps, as well as the components of the back portion
3340.1. Furthermore, the components of the exemplary positioning and stabilising
structure 3340 may be connected to one another to assemble the positioning and
stabilising structure by ultrasonic welding. For example, each hook portion 3349 may be
attached to a respective upper or lower strap by ultrasonic welding at a hook joint 3347.
Also, the upper and lower straps may be joined to the components of the back portion
by ultrasonic welding at the strap joints 3347.1. The strap joints 3347.1 may be formed,
according a further example, by a two-way ultrasonic weld.
It should also be understood that Fig. 4a shows a view of the exemplary
positioning and stabilising structure 3340 wherein it is laid out flat and the crown strap
3348 is not connected to the upper left strap 3346. When the crown strap 3348 is
connected to the upper left strap 3346, the positioning and stabilising structure 3340 will
take on a more curved shape, such as that shown in Fig. 3.
Components of the exemplary positioning and stabilising structure 3340
may be formed by a knitting process. To provide the desired strength and stretchability
of these parts the weft of the component used in knitting the component may be oriented
in a desired direction. For example, a neck piece weft direction 3343.1 is shown on the
neck piece 3343 in Fig. 4h. In Fig. 4n, the right crown piece 3342 and a right crown
piece weft direction 3342.1 are shown. In Fig. 4q, the left crown piece 3342 and a left
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crown piece weft direction 3342.1 are shown. In Fig. 4x, the crown strap 3348 and a
crown strap weft direction 3348.1 are shown.
Dimensions of the components of the positioning and stabilising structure
may vary or remain unchanged between different sizes of positioning and stabilising
structures. Fig. 4j shows that the lower right and left straps 3344 may have a length of
L , which may be about 270.0 mm ± 0.5 mm according to one example. Figs. 4l and 4m
depict dimensions L , L , L , and L of the right crown strap 3342. According to one
2 3 4 5
example, L may be about 69.6 mm, L may be about 43.6 mm, L may be about 20.4
2 3 4
mm, and L may be about 67.3 mm. Figs. 4o and 4p depict dimensions L , L , L , and
6 7 8
L of the left crown strap 3345, which may be equal to the dimensions L , L , L , and
9 2 3 4
L , respectively, of the right crown strap 3342. Figs. 4r and 4s depict dimensions L ,
10
L , and L of the upper right strap 3341. According to one example, L may be about
11 12 10
140.0 mm, L may be about 155.1 mm, and L may be about 40.9 mm. Figs. 4t and 4u
11 12
depict dimensions L , L , and L of the upper left strap 3346, which may be equal to
13 14 15
the dimensions L , L , and L , respectively, of the upper right strap 3341. Fig. 4w
11 12
depicts dimension L of the crown strap 3348, which may be about 239.7 mm,
according to one example.
6.3.1.2.1.2 Large Size
Figs. 5a-5l depict an example of a positioning and stabilising structure
3350 according to the present technology. The exemplary positioning and stabilising
structure 3350 shown in these Figures may include a back portion 3350.1. The
exemplary back portion 3350.1 may include a left crown piece 3355 and a right crown
piece 3352, as well as a neck piece 3353. The positioning and stabilising structure 3350
may also include a crown strap 3358. Also, extending from the back portion 3350.1 may
be an upper left strap 3356 and an upper right strap 3351, as well as a lower left strap
3354 and a lower right strap 3354. It should be understood that the lower straps of the
exemplary positioning and stabilising structure 3350 may be identical. A hook portion
3359 of hook material may be attached at a distal end of each of the upper straps 3356,
3351 and lower straps 3354. The hook portion 3359 may be used to attach each strap to
itself by looping through attachment points of the patient interface. The connection with
the hook portions 3359 may be facilitated by a layer of loop material on the exterior of
some or all of the components of the positioning and stabilising structure 3350.
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According to one example of the present technology, the upper straps 3356, 3351 and
lower straps 3354 may each have an exterior layer of hook material for releasable
attachment with the respective hook portions 3359.
According to another example of the present technology, each component
of the positioning and stabilising structure 3350 may also include an exterior layer of
loop material such that when the upper straps 3356, 3351 and the lower straps 3354 are
looped back on themselves the hook portions 3359 can connect to parts of the back
portion. For example, the crown strap 3358, the left crown piece 3355, the right crown
piece 3352, and the neck piece 3353 may include an exterior layer of loop material so
that the hook portions 3359 may connect at the respective junctions between the back
portion 3350.1 components and the upper straps 3356, 3351 and the lower straps 3354.
Also, as discussed above, the hook portions 3359 may be relatively
narrower than their respective straps, as well as the components of the back portion
3350.1. Furthermore, the components of the exemplary positioning and stabilising
structure 3350 may be connected to one another to assemble the positioning and
stabilising structure by ultrasonic welding. For example, each hook portion 3359 may be
attached to a respective upper or lower strap by ultrasonic welding at a hook joint 3357.
Also, the upper and lower straps may be joined to the components of the back portion
by ultrasonic welding at the strap joints 3357.1. The strap joints 3357.1 may be formed,
according a further example, by a two-way ultrasonic weld.
It should also be understood that Fig. 5a shows a view of the exemplary
positioning and stabilising structure 3350 wherein it is laid out flat and the crown strap
3358 is not connected to the upper left strap 3356. When the crown strap 3358 is
connected to the upper left strap 3356, the positioning and stabilising structure 3350 will
take on a more curved shape, such as that shown in Fig. 3.
Dimensions of the components of the positioning and stabilising structure
may vary or remain unchanged between different sizes of positioning and stabilising
structures. Figs. 5f and 5g depict dimensions L , L , and L of the upper right strap
17 18 19
3351. According to one example, L may be about 180.0 mm, L may be about 195.1
17 18
mm, and L may be about 40.9 mm. Figs. 5h and 5i depict dimensions L , L , and L
19 20 21 22
of the upper left strap 3356, which may be equal to the dimensions L , L , and L ,
17 18 19
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respectively, of the upper right strap 3351. Fig. 5k depicts dimension L of the crown
strap 3358, which may be about 249.7 mm, according to one example.
As discussed above, some dimensions of the components of the
exemplary large size positioning and stabilising structure 3350 may vary as compared to
the standard size positioning and stabilising structure 3340 while others may remain the
same. In accordance with an example of the present technology, the large size
positioning and stabilising structure 3350 may include larger upper right and left straps
3351, 3356 and a larger crown strap 3358 as compared to the corresponding
components of the standard size positioning and stabilising structure 3340. Reference
may be had to the exemplary dimensions outlined above for details on the differences.
Some dimensions may, however, remain unchanged. For example, the large size
positioning and stabilising structure 3350 may include the same dimensions as the
standard size positioning and stabilising structure 3340 for the neck piece 3353, the
lower right and left straps 3354, and the right and left crown pieces 3352, 3355.
Choosing to vary or not to vary certain dimensions of these components
for various positioning and stabilising structure sizes may be based on typical patient
head size measurements. For example, it may be the case that the regions of the head to
be accommodated by the lower straps may not vary between medium and large head
sizes while the regions of the head to be accommodated by the upper straps and the
crown strap may require longer straps for larger heads.
6.3.1.2.1.3 Small Size
Figs. 6a-6l depict an example of a positioning and stabilising structure
3360 according to the present technology. The exemplary positioning and stabilising
structure 3360 shown in these Figures may include a back portion 3360.1. The
exemplary back portion 3360.1 may include a left crown piece 3365 and a right crown
piece 3362, as well as a neck piece 3363. The positioning and stabilising structure 3360
may also include a crown strap 3368. Also, extending from the back portion 3360.1 may
be an upper left strap 3366 and an upper right strap 3361, as well as a lower left strap
3364 and a lower right strap 3364. It should be understood that the lower straps of the
exemplary positioning and stabilising structure 3360 may be identical. A hook portion
3369 of hook material may be attached at a distal end of each of the upper straps 3366,
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3361 and lower straps 3364. The hook portion 3369 may be used to attach each strap to
itself by looping through attachment points of the patient interface. The connection with
the hook portions 3369 may be facilitated by a layer of loop material on the exterior of
some or all of the components of the positioning and stabilising structure 3360.
According to one example of the present technology, the upper straps 3366, 3361 and
lower straps 3364 may each have an exterior layer of hook material for releasable
attachment with the respective hook portions 3369.
According to another example of the present technology, each component
of the positioning and stabilising structure 3360 may also include an exterior layer of
loop material such that when the upper straps 3366, 3361 and the lower straps 3364 are
looped back on themselves the hook portions 3369 can connect to parts of the back
portion. For example, the crown strap 3368, the left crown piece 3365, the right crown
piece 3362, and the neck piece 3363 may include an exterior layer of loop material so
that the hook portions 3369 may connect at the respective junctions between the back
portion 3360.1 components and the upper straps 3366, 3361 and the lower straps 3364.
Also, as discussed above, the hook portions 3369 may be relatively
narrower than their respective straps, as well as the components of the back portion
3360.1. Furthermore, the components of the exemplary positioning and stabilising
structure 3360 may be connected to one another to assemble the positioning and
stabilising structure by ultrasonic welding. For example, each hook portion 3369 may be
attached to a respective upper or lower strap by ultrasonic welding at a hook joint 3367.
Also, the upper and lower straps may be joined to the components of the back portion
by ultrasonic welding at the strap joints 3367.1. The strap joints 3367.1 may be formed,
according a further example, by a two-way ultrasonic weld.
It should also be understood that Fig. 6a shows a view of the exemplary
positioning and stabilising structure 3360 wherein it is laid out flat and the crown strap
3368 is not connected to the upper left strap 3366. When the crown strap 3368 is
connected to the upper left strap 3366, the positioning and stabilising structure 3360 will
take on a more curved shape, such as that shown in Fig. 3.
Dimensions of the components of the positioning and stabilising structure
may vary or remain unchanged between different sizes of positioning and stabilising
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structures. Fig. 6h shows that the lower right and left straps 3364 may have a length of
L , which may be about 230.0 mm ± 0.5 mm according to one example. Figs. 6j and 6k
depict dimensions L , L , L , and L of the right crown strap 3362. According to one
26 27 28
example, L may be about 64.6 mm, L may be about 38.6 mm, L may be about 20.9
26 27
mm, and L may be about 63.6 mm. Figs. 6m and 6n depict dimensions L , L , L ,
28 29 30 31
and L of the left crown strap 3365, which may be equal to the dimensions L , L , L ,
32 25 26 27
and L , respectively, of the right crown strap 3362. Figs. 6p and 6q depict dimensions
L , L , and L of the upper right strap 3361. According to one example, L may be
33 34 35 33
about 130.0 mm, L may be about 145.8 mm, and L may be about 41.9 mm. Figs. 6r
34 35
and 6s depict dimensions L , L , and L of the upper left strap 3366, which may be
36 37 38
equal to the dimensions L , L , and L , respectively, of the upper right strap 3361.
33 34 35
Fig. 6t depicts dimension L of the crown strap 3368, which may be about 227.4 mm,
according to one example.
As discussed above, some dimensions of the components of the
exemplary small size positioning and stabilising structure 3360 may vary as compared
to the standard size positioning and stabilising structure 3340 while others may remain
the same. According to an example of the present technology, the small size headgear
3360 may only use a neck piece 3363 of the same dimensions as the standard size
positioning and stabilising structure 3340. The remaining components may be sized
according to the dimensions disclosed above.
Choosing to vary or not to vary certain dimensions of these components
for various positioning and stabilising structure sizes may be based on typical patient
head size measurements. In contrast to the large and standard size positioning and
stabilising structures that may share several dimensions, it may be the case that as the
patient’s head decreases in size that more components of the positioning and stabilising
structure may need to be decreased to accommodate the smaller head size.
6.3.2 Evenly Distributed Sealing Force
According to an example of the present technology, the positioning and
stabilising structure 3300 may generate an even distribution of sealing force on the seal-
forming structure to seal against the face of the patient.
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6.3.2.1 Sealing Force Vectors and the Frankfort Horizontal
In Fig. 8c, an upper sealing force vector F is shown being generated by
the upper right strap 3314 and a lower sealing force vector F is shown being generated
by the lower right strap 3318. According to an example of the present technology, both
sealing force vectors F and F (and their counterparts not shown on the other side of the
patient’s head) are intended to be directed substantially parallel to the Frankfort
horizontal which can be seen in Fig. 2e. By maintaining these sealing force vectors in a
substantially parallel orientation relative to the Frankfort horizontal it may be possible
to more evenly distribute the sealing force of the seal-forming structure 3100 against the
face of the patient. This may improve patient comfort because there is no location along
the seal-forming structure 3100 that presses against the face with an amount of force in
excess of another location. In accordance with another example of the present
technology, the sealing force vectors generated by upper and lower straps may be
substantially parallel to one another.
6.3.2.2 Connection of the Patient Interface Frame and the Cushion Assembly
Figs. 7a-7e, 7j-7m, 7o, 7p, and 14-18 show various views of a patient
interface frame according to an example of the present technology. Figs. 8a-8c show
various views of a patient interface 3000 and a positioning and stabilising structure 3300
assembled and donned on a patient. As discussed above, the seal-forming structure 3100
may be a silicone component that is molded onto the plenum chamber 3200 that may be
made of Nylon to form a cushion assembly. Nylon 12 may also be used to form the
plenum chamber 3200 in a further example of the technology. In another example of the
technology polycarbonate may be used to form the plenum chamber 3200. A patient
interface frame 3370 facilitates the connection between the cushion assembly and the
positioning and stabilising structure 3300, so it must be connectable to the cushion
assembly to transfer the sealing forces from the positioning and stabilising structure.
The plenum chamber 3200 and the patient interface frame 3370 may include
cooperating features to allow these components to be friction fit to one another. The
exemplary patient interface frame 3370 may include a pair of upper patient interface
frame retention features 3384 and a pair of lower patient interface frame retention
features 3382. The plenum chamber 3200 may also include a corresponding pair of
upper plenum chamber retention features and a corresponding pair of lower plenum
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chamber features, although these are not shown in these views. As can be seen in these
views, the upper and lower patient interface frame retention features 3384, 3382 may be
formed as protrusions from the patient interface frame 3370. Thus, the plenum
chamber’s 3200 upper and lower plenum chamber retention features would be
corresponding indentations or receptacles to affect the friction fit. An opposite
configuration is also envisioned.
As can be seen in these views, the patient interface frame 3370 may be
shaped to surround a periphery of the plenum chamber 3200. If the plenum chamber
3200 is made from polycarbonate, which is a transparent material, this may allow the
bed partner to see more of the facial features of the patient, thereby making the patient
interface 3000 more pleasant looking. It should, therefore, be understood that the
connection between the plenum chamber 3200 and the patient interface frame 3370 may
be characterized as hard-to-hard.
Also, by connecting the patient interface frame 3370 to the plenum
chamber 3200 about its periphery a more even transfer of sealing force to the seal-
forming structure 3100 may be facilitated. According to an example of the present
technology, the plenum chamber 3200 may be formed from polycarbonate or another
relatively rigid material, while the seal-forming structure 3100 may be formed from a
relatively pliable material such as silicone. Tension in the positioning and stabilising
structure 3300 is transferred via the patient interface frame 3370 to the plenum chamber
3200 about the periphery of the plenum chamber. The seal-forming structure 3100 may
also be molded to the plenum chamber 3200 about its periphery. Thus, an even
distribution of sealing force about the periphery of the plenum chamber 3200 may lead
to an even distribution of that force to the seal-forming structure 3100 as it is also
connected to the plenum chamber about its periphery.
An additional concept that should be understood in the selection of
materials of the plenum chamber 3200 and the seal-forming structure 3100 is that
minimal deformation is desired for the plenum chamber while some deformation
intended for the seal-forming structure. Thus, for the plenum chamber 3200 a material
should be chosen such that the plenum chamber will not deform under the tension loads
generated by the straps. The seal-forming structure 3100 on the other hand may be
intended to deform to form a seal around the facial features of the patient. Thus, the
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seal-forming structure 3100 should be formed from a material that will deform
sufficiently to affect a pneumatic seal while not deforming to such a degree that the
plenum chamber 3200 presses against the face. By selecting materials based on this
concept it may be possible to ensure that an even distribution of sealing force is
provided about the periphery of the seal-forming structure 3100 to maximize patient
comfort.
Figs. 19-21 show another example of the present technology where the
seal-forming structure 3100 may be detachable from the plenum chamber 3200. Fig. 19
shows the plenum chamber 3200 with a first attachment region 3202 that may extend
around the periphery of the plenum chamber 3200 to join with the seal-forming
structure 3100. The plenum chamber 3200 may also include upper receivers 3208 to
receive the upper patient interface frame retention features 3384 and lower receivers
3206 to receive the lower patient interface frame retention features 3382. An upper
receiver 3208 and a lower receiver 3206 may, accordingly, be provided on each side of
the plenum chamber 3200 to receive corresponding ones of the upper patient interface
frame retention features 3384 and the lower patient interface frame retention features
3382 when the patient interface frame 3370 is attached. Detents 3204 may also be
provided to the plenum chamber 3200 to facilitate a snap-fit connection with the seal-
forming structure 3100. A detents 3204 may be provided on each side of the plenum
chamber 3200.
Fig. 20 shows the seal-forming structure 3100 according to the present
example. The seal-forming structure 3100 may include a second attachment region 3102
to attach the seal-forming structure 3100 to the plenum chamber 3200 at the first
attachment region. The second attachment region 3102 may be formed around the
periphery of the seal-forming structure 3100. The first attachment region 3202 and the
second attachment region 3102 may be shaped to conform to one another in a press-fit,
snap-fit, and/or friction-fit. One of the first attachment region 3202 and the second
attachment region 3102 may be formed from a more compliant and/or flexible material
than the other to allow for a secure fit by deforming to provide a conforming
attachment. Also, the seal-forming structure 3100 may be provided with protrusions
3104 corresponding to the detents 3204 of the plenum chamber to form a snap-fit
therewith and secure the seal-forming structure 3100 to plenum chamber 3200.
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Fig. 21 shows the present example with the seal-forming structure 3100
and the plenum chamber 3200 joined to one another at their respective peripheries by
engagement of the first attachment region 3202 and the second attachment region 3102.
Further examples of attachment between a seal-forming structure 3100
and a plenum chamber 3200 that are envisioned are disclosed in US Patent Nos.
6,491,034, 6,412,487, 6,823,869, each of which is incorporated herein by reference in
its entirety.
6.3.2.3 Rigidiser Arms
According to an example of the present technology, the patient interface
frame 3370 may include a pair of rigidiser arms 3371, 3381. Figs. 7f and 7g depict the
right rigidiser arm 3371. The right rigidiser arm 3371 may include an upper right
attachment point 3375 for attachment to the upper right strap 3314 and a right rigidiser
arm connection feature 3373 for connection to a right frame connection feature 3376 of
the patient interface frame 3370. Figs. 7h and 7i depict the left rigidiser arm 3381. The
left rigidiser arm 3381 may include an upper left attachment point 3385 for attachment
to the upper left strap 3312 and a left rigidiser arm connection feature 3383 for
connection to a left frame connection feature 3378 of the patient interface frame 3370.
Each rigidiser arm connection feature 3373, 3383 may connect its respective rigidiser
arm 3371, 3381 to the patient interface frame 3370 by being directly connected to
and/or engaged with a respective frame connection feature 3376, 3378. The rigidiser
arms 3371, 3381 may be formed from polycarbonate and/or nylon. According to another
example of the technology, flexible connection structures 3377, 3387 may connect the
rigidiser arm connection features 3373, 3383 to the respective frame connection features
3376, 3378 without these connection features being in direct connection and/or
engagement such that the flexible connection structures serve as intermediate
connection pieces.
As can be seen in Figs. 8a-8c, the rigidiser arms 3371, 3381 may be
shaped such that when the patient interface 3000 and the positioning and stabilising
structure 3300 are donned by the patient the rigidiser arms do not pass over the eyes.
The rigidiser arms 3371, 3381 may also be shaped to avoid the ears and the temples. As
can be seen in Fig. 8c, the right rigidiser arm 3371 is shaped to pass along and conform
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to the patient’s cheek and extend between the eye and ear while avoiding the temple
such that the upper right strap 3314 connects to the right rigidiser arm at the upper right
attachment point 3375 above the ear.
Also, as can be seen from these views, the rigidiser arms 3371, 3381 are
relatively wider along their longitudinal axes. By forming the rigidiser arms 3371, 3381
this may allow for targeted flexing of the rigidiser arms. In other words, flexing is
resisted more greatly in the direction of the wider cross-section while it is resisted less
in the direction of the narrower cross-section. This may be advantageous in that the
rigidiser arms 3371, 3381 may be allowed to flex toward the patient’s face and cheeks
in conformity therewith when placed in tension by the positioning and stabilising
structure, while flexing upward into the patient’s eyes or downward toward the patient’s
ears is resisted.
Figs. 8a-8c also show an attachment point plane PA and a connection
point plane PC offset vertically from one another by a distance O. Both planes should be
understood to be substantially parallel to the Frankfort horizontal depicted in Fig. 2e.
Also, the attachment point plane PA is located such that the upper attachment points
3375, 3385 of the rigidiser arms 3371, 3381 are located within the attachment point
plane. Furthermore, the connection point plane PC is located such that right and left
connection points 3391, 3393 between the rigidiser arms 3371, 3381 and the patient
interface frame 3370 lie within the connection point plane.
Figs. 10a and 10b show exemplary desired rigidiser arm paths along a side
profile of a patient’s head for large and small size heads, respectively. The desired
rigidiser arm paths are within the rectangular regions having widths of 68mm and
51mm, respectively. The measurements indicated in these drawings represent the basis
for sizing and shaping the rigidiser arms such that they follow the indicated paths so as
to provide optimal patient comfort.
6.3.2.3.1 Attachment Points for the Positioning and Stabilising Structure
According to an example of the present technology, the rigidiser arms
3371, 3381 may provide upper attachments points 3375, 3385 for the upper straps 3312,
3314 of the positioning and stabilising structure 3300, as discussed above. According to
an example of the present technology the upper attachment points 3375, 3385 may be
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slots formed at respective ends of the rigidiser arms 3371, 3381. The upper straps 3312,
3314 may be connected to the respective upper attachment points 3375, 3385 by looping
through them. The patient interface frame 3370 may also include lower attachment
points 3372, 3374 for the lower straps 3316, 3318, which can be seen in Figs. 7a-7c, 7e,
7j, 7k, 7p, and 8a-8c. The lower attachment points 3372, 3374 may each include a hook
3380 as shown in Figs. 7j-7n The hook 3380 may help retain the respective lower strap
3316, 3318 when it is looped around the lower attachment point, as shown in Figs. 8a-
8c. As discussed above, forming the lower attachment points 3372, 3374 as depicted
would allow the patient to leave the hook portions 3320 connected to the respective
lower straps 3316, 3318 when doffing the patient interface 3000 and the positioning and
stabilising structure 3300. The patient may be able to simply slip the looped portion
formed by attaching the hook portions 3320 to the respective lower straps 3316, 3318
over the respective lower attachment points 3372, 3374 when donning the patient
interface 3000 and the positioning and stabilising structure 3300. The lower straps 3316,
3318 would then be retained by the hooks 3380.
Fig. 13 shows another example of a rigidiser arm 3371 according to the
present technology. The rigidiser arm 3371 shown in this view may include a rigidiser
arm connection feature 3373. This exemplary rigidiser arm 3371 may also be shaped
and dimensioned similarly to the rigidiser arm shown in Figs. 7f and 7g. The upper
attachment point 3375 may be different, however, in that it may include an opening
3379 into the slot that comprises the attachment point. By shaping the attachment point
3375 as depicted the patient may be able to pull the looped upper straps from the upper
attachment points without disconnecting the hook portions from the respective upper
straps. This may be advantageous for the patient because the patient would not be
required to adjust the length of the upper straps each time the patient interface 3000 and
the positioning and stabilising structure 3300 are donned. Rather, the patient would be
able to simply slip the upper straps out of the attachment points of the respective
rigidiser arms. Also, in this example the opening may narrow into the attachment point
3375. This may make it easier to slide the straps into the attachment points but make it
more difficult to remove the straps and, therefore, less likely that the straps will fall off
during therapy.
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It is also envisioned that other attachment configurations may be provided
for connecting the straps to the attachment points. For example, clips may be provided,
through which the straps loop, and the clips in turn may attach to respective attachment
points (i.e., receptacles) of the rigidiser arms and the patient interface frame.
6.3.2.4 Connection of the Rigidiser Arms and the Patient Interface Frame
According to an example of the present technology, the rigidiser arms
3371, 3381 may be connected to the patient interface frame 3370 in a hinge-like
manner. The hinge may be mechanical or living. A mechanical hinge may be formed by
the patient interface frame 3370 having a post about which the rigidiser arms 3371,
3381 are connected and rotate. A living hinge may involve a flexible connection that is
discussed in greater detail below. The hinge in an example of the technology may
comprise a flexible silicone hinge. Regardless of the type of hinge used, it may be
advantageous to form the hinge such that the rigidiser arms 3371, 3381 are rotatable
substantially in a single plane that is substantially parallel to the Frankfort horizontal
shown in Fig. 2e. This may help to keep the rigidiser arms 3371, 3381 from rotating
upward and into the patient’s field of view or downward and against the ears.
It should be understood that the patient interface frame 3370 and the
rigidiser arms 3371, 3381 may be formed separately and then connected by a
mechanical connection, either permanently or releasably. Alternatively, these
components may be joined by overmolding one to the other. In a further alternative, the
patient interface frame 3370 and the rigidiser arms 3371, 3381 may be formed
separately and then connected by overmolding a third component over the connection to
facilitate the connection. In a still further alternative, the patient interface frame 3370
and the rigidiser arms 3371, 3381 may be molded together as one piece and in a further
variation an additional component may be overmolded to the joint to further control the
flexibility of the rigidiser arms.
To facilitate a connection between the rigidiser arms 3371, 3381 and the
patient interface frame 3370 with a desired level of flexibility, flexible connection
structures 3377, 3387 may connect the right rigidiser arm connection feature 3373 and
the right frame connection feature 3376 and the left rigidiser arm connection feature
3383 and the left frame connection feature 3378. The flexible connection structures
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3377, 3387 may be formed from a material such as silicone or a thermoplastic elastomer
that is relatively more flexible than the rigidiser arms 3371, 3381 and the patient
interface frame 3370. The flexible connection structures 3377, 3387 may also be
overmolded onto the rigidiser arms 3371, 3381 and the patient interface frame 3370 to
facilitate a permanent connection between these components.
According to another example of the present technology, shown in Figs.
22 and 23, the connection points for the positioning and stabilising structure 3300 may
be formed directly on or integrally with the plenum chamber 3200. According to this
example, the right frame connection feature 3376 and the left frame connection feature
3378 may be formed integrally with the plenum chamber 3200. The flexible connection
structures 3377, 3387 may be overmolded directly onto the plenum chamber 3200 at the
right frame connection feature 3376 and the left frame connection feature 3378,
respectively, to attach the rigidiser arms 3371, 3381. Also, the lower attachment points
3372, 3374 may be formed integrally with the plenum chamber 3200. It should be
understood that in such an example that the patient interface frame 3370 may be
unnecessary as the flexible connection structures 3377, 3387 and the lower attachment
points 3372, 3374 are integral with the plenum chamber 3200. Accordingly, the seal-
forming structure 3100 may be joined to or formed integrally with the plenum chamber
3200. This example may be advantageous in that fewer components are required, which
may reduce manufacturing costs and provide a simpler patient interface system for the
patient.
6.3.3 Improved Stability of the Positioning and Stabilising Structure
According to an example of the present technology, the positioning and
stabilising structure 3300 may provide improved stability, particularly in the region of
the crown of the head. Improvements in stability of the positioning and stabilising
structure 3300 over previous positioning and stabilising structures may be accomplished
by widening components of the positioning and stabilising structure.
6.3.3.1 Widened Connection Portion
According to an example of the present technology, a connection region
of the positioning and stabilising structure 3300 near the crown of the head and at the
connection between the upper straps 3316, 3318, the crown strap 3304, and the crown
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pieces 3306, 3308 may be widened to improve stability. This may be done by widening
the aforementioned components near this region. It may be desirable to widen the
above-mentioned portions of the exemplary positioning and stabilising structure 3300 to
better counteract riding up of the patient interface 3000, which may occur due to
displacement of the positioning and stabilising structure from its intended position.
Increasing the surface area these regions of connection may enhance stiffness so that the
back portion 3302 remains on the back of the head. It may also result in better resistance
to buckling in the straps. Stability may also be enhanced by widening these components
because a larger surface area of the head is contacted.
Fig. 9 shows the standard size positioning and stabilising structure 3340
laid flat with a related art positioning and stabilising structure 3399 that is designed to
fit the same size head. The regions of relatively increased width are visible in this view
to indicate how much wider these regions are relative to the related art positioning and
stabilising structure 3399, which is more prone slipping and buckling.
6.3.4 Vent 3400
In one form, the patient interface 3000 includes a vent 3400 constructed
and arranged to allow for the washout of exhaled carbon dioxide.
One form of vent 3400 in accordance with the present technology
comprises a plurality of holes, for example, about 20 to about 80 holes, or about 40 to
about 60 holes, or about 45 to about 55 holes.
The vent 3400 may be located in the plenum chamber 3200. Alternatively,
the vent 3400 is located in a decoupling structure 3500, e.g. a swivel.
6.3.5 Decoupling structure(s) 3500
In one form the patient interface 3000 includes at least one decoupling
structure 3500, for example a swivel or a ball and socket.
6.3.6 Connection port 3600
Connection port 3600 allows for connection to the air circuit 4170.
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6.3.7 Anti-asphyxia 3800
In one form, the patient interface 3000 includes an anti-asphyxia valve
3800.
6.3.8 Ports 3900
In one form of the present technology, a patient interface 3000 includes
one or more ports that allow access to the volume within the plenum chamber 3200. In
one form this allows a clinician to supply supplemental oxygen. In one form this allows
for the direct measurement of a property of gases within the plenum chamber 3200, such
as the pressure.
6.3.9 Patient Interface and Positioning and Stabilising Structure Assembly
Figs. 11 and 12 depict perspective view of exemplary patient interfaces
3000 and positioning and stabilising structures 3300. Both exemplary devices depict
similar features inclusive of those discussed above.
6.4 GLOSSARY
For the purposes of the present technology disclosure, in certain forms of
the present technology, one or more of the following definitions may apply. In other
forms of the present technology, alternative definitions may apply.
6.4.1 General
Air: In certain forms of the present technology, air supplied to a patient
may be atmospheric air, and in other forms of the present technology atmospheric air
may be supplemented with oxygen.
Continuous Positive Airway Pressure (CPAP): CPAP treatment will be
taken to mean the application of a supply of air or breathable gas to the entrance to the
airways at a pressure that is continuously positive with respect to atmosphere, and
preferably approximately constant through a respiratory cycle of a patient. In some
forms, the pressure at the entrance to the airways will vary by a few centimeters of
water within a single respiratory cycle, for example being higher during inhalation and
lower during exhalation. In some forms, the pressure at the entrance to the airways will
be slightly higher during exhalation, and slightly lower during inhalation. In some
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forms, the pressure will vary between different respiratory cycles of the patient, for
example being increased in response to detection of indications of partial upper airway
obstruction, and decreased in the absence of indications of partial upper airway
obstruction.
6.4.2 Aspects of PAP devices
Air circuit: A conduit or tube constructed and arranged in use to deliver a
supply of air or breathable gas between a PAP device and a patient interface. In
particular, the air circuit may be in fluid connection with the outlet of the pneumatic
block and the patient interface. The air circuit may be referred to as air delivery tube. In
some cases there may be separate limbs of the circuit for inhalation and exhalation. In
other cases a single limb is used.
APAP: Automatic Positive Airway Pressure. Positive airway pressure that
is continually adjustable between minimum and maximum limits, depending on the
presence or absence of indications of SDB events.
Blower or flow generator: A device that delivers a flow of air at a pressure
above ambient pressure.
Controller: A device, or portion of a device that adjusts an output based
on an input. For example one form of controller has a variable that is under control- the
control variable- that constitutes the input to the device. The output of the device is a
function of the current value of the control variable, and a set point for the variable. A
servo-ventilator may include a controller that has ventilation as an input, a target
ventilation as the set point, and level of pressure support as an output. Other forms of
input may be one or more of oxygen saturation (SaO2), partial pressure of carbon
dioxide (PCO2), movement, a signal from a photoplethysmogram, and peak flow. The
set point of the controller may be one or more of fixed, variable or learned. For
example, the set point in a ventilator may be a long term average of the measured
ventilation of a patient. Another ventilator may have a ventilation set point that changes
with time. A pressure controller may be configured to control a blower or pump to
deliver air at a particular pressure.
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Therapy: Therapy in the present context may be one or more of positive
pressure therapy, oxygen therapy, carbon dioxide therapy, control of dead space, and the
administration of a drug.
Motor: A device for converting electrical energy into rotary movement of
a member. In the present context the rotating member is an impeller, which rotates in
place around a fixed axis so as to impart a pressure increase to air moving along the axis
of rotation.
Positive Airway Pressure (PAP) device: A device for providing a supply
of air at positive pressure to the airways.
Transducers: A device for converting one form of energy or signal into
another. A transducer may be a sensor or detector for converting mechanical energy
(such as movement) into an electrical signal. Examples of transducers include pressure
sensors, flow sensors, carbon dioxide (CO ) sensors, oxygen (O ) sensors, effort
sensors, movement sensors, noise sensors, a plethysmograph, and cameras.
Volute: The casing of the centrifugal pump that receives the air being
pumped by the impeller, slowing down the flow rate of air and increasing the pressure.
The cross-section of the volute increases in area towards the discharge port.
6.4.3 Aspects of the respiratory cycle
Apnea: Preferably, apnea will be said to have occurred when flow falls
below a predetermined threshold for a duration, e.g. 10 seconds. An obstructive apnea
will be said to have occurred when, despite patient effort, some obstruction of the
airway does not allow air to flow. A central apnea will be said to have occurred when an
apnea is detected that is due to a reduction in breathing effort, or the absence of
breathing effort.
Breathing rate: The rate of spontaneous respiration of a patient, usually
measured in breaths per minute.
Duty cycle: The ratio of inhalation time, Ti to total breath time, Ttot.
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Effort (breathing): Preferably breathing effort will be said to be the work
done by a spontaneously breathing person attempting to breathe.
Expiratory portion of a breathing cycle: The period from the start of
expiratory flow to the start of inspiratory flow.
Flow limitation: Preferably, flow limitation will be taken to be the state of
affairs in a patient's respiration where an increase in effort by the patient does not give
rise to a corresponding increase in flow. Where flow limitation occurs during an
inspiratory portion of the breathing cycle it may be described as inspiratory flow
limitation. Where flow limitation occurs during an expiratory portion of the breathing
cycle it may be described as expiratory flow limitation.
Types of flow limited inspiratory waveforms:
(i) Flattened: Having a rise followed by a relatively flat portion, followed
by a fall.
(ii) M-shaped: Having two local peaks, one at the leading edge, and one at
the trailing edge, and a relatively flat portion between the two peaks.
(iii) Chair-shaped: Having a single local peak, the peak being at the
leading edge, followed by a relatively flat portion.
(iv) Reverse-chair shaped: Having a relatively flat portion followed by
single local peak, the peak being at the trailing edge.
Hypopnea: Preferably, a hypopnea will be taken to be a reduction in flow,
but not a cessation of flow. In one form, a hypopnea may be said to have occurred when
there is a reduction in flow below a threshold for a duration. In one form in adults, the
following either of the following may be regarded as being hypopneas:
(i) a 30% reduction in patient breathing for at least 10 seconds plus an
associated 4% desaturation; or
(ii) a reduction in patient breathing (but less than 50%) for at least 10 seconds,
with an associated desaturation of at least 3% or an arousal.
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Hyperpnea: An increase in flow to a level higher than normal flow?.
Inspiratory portion of a breathing cycle: Preferably the period from the
start of inspiratory flow to the start of expiratory flow will be taken to be the inspiratory
portion of a breathing cycle.
Patency (airway): The degree of the airway being open, or the extent to
which the airway is open. A patent airway is open. Airway patency may be quantified,
for example with a value of one (1) being patent, and a value of zero (0), being closed.
Positive End-Expiratory Pressure (PEEP): The pressure above
atmosphere in the lungs that exists at the end of expiration.
Peak flow (Qpeak): The maximum value of flow during the inspiratory
portion of the respiratory flow waveform.
Respiratory flow, airflow, patient airflow, respiratory airflow (Qr): These
synonymous terms may be understood to refer to the PAP device’s estimate of
respiratory airflow, as opposed to “true respiratory flow” or “true respiratory airflow”,
which is the actual respiratory flow experienced by the patient, usually expressed in
litres per minute.
Tidal volume (Vt): The volume of air inhaled or exhaled during normal
breathing, when extra effort is not applied.
(inhalation) Time (Ti): The duration of the inspiratory portion of the
respiratory flow waveform.
(exhalation) Time (Te): The duration of the expiratory portion of the
respiratory flow waveform.
(total) Time (Ttot): The total duration between the start of the inspiratory
portion of one respiratory flow waveform and the start of the inspiratory portion of the
following respiratory flow waveform.
Typical recent ventilation: The value of ventilation around which recent
values over some predetermined timescale tend to cluster, that is, a measure of the
central tendency of the recent values of ventilation.
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Upper airway obstruction (UAO): includes both partial and total upper
airway obstruction. This may be associated with a state of flow limitation, in which the
level of flow increases only slightly or may even decrease as the pressure difference
across the upper airway increases (Starling resistor behaviour).
Ventilation (Vent): A measure of the total amount of gas being exchanged
by the patient’s respiratory system, including both inspiratory and expiratory flow, per
unit time. When expressed as a volume per minute, this quantity is often referred to as
“minute ventilation”. Minute ventilation is sometimes given simply as a volume,
understood to be the volume per minute.
6.4.4 PAP device parameters
Flow rate: The instantaneous volume (or mass) of air delivered per unit
time. While flow rate and ventilation have the same dimensions of volume or mass per
unit time, flow rate is measured over a much shorter period of time. Flow may be
nominally positive for the inspiratory portion of a breathing cycle of a patient, and
hence negative for the expiratory portion of the breathing cycle of a patient. In some
cases, a reference to flow rate will be a reference to a scalar quantity, namely a quantity
having magnitude only. In other cases, a reference to flow rate will be a reference to a
vector quantity, namely a quantity having both magnitude and direction. Flow will be
given the symbol Q. Total flow, Qt, is the flow of air leaving the PAP device. Vent
flow, Qv, is the flow of air leaving a vent to allow washout of exhaled gases. Leak flow,
Ql, is the flow rate of unintentional leak from a patient interface system. Respiratory
flow, Qr, is the flow of air that is received into the patient's respiratory system.
Leak: Preferably, the word leak will be taken to be a flow of air to the
ambient. Leak may be intentional, for example to allow for the washout of exhaled CO .
Leak may be unintentional, for example, as the result of an incomplete seal between a
mask and a patient's face.
Pressure: Force per unit area. Pressure may be measured in a range of
units, including cmH O, g-f/cm , hectopascal. 1cmH O is equal to 1 g-f/cm and is
approximately 0.98 hectopascal. In this specification, unless otherwise stated, pressure
is given in units of cmH2O. For nasal CPAP treatment of OSA, a reference to treatment
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pressure is a reference to a pressure in the range of about 4-20 cmH O, or about 4-30
cmH O. The pressure in the patient interface is given the symbol Pm.
Sound Power: The energy per unit time carried by a sound wave. The
sound power is proportional to the square of sound pressure multiplied by the area of the
wavefront. Sound power is usually given in decibels SWL, that is, decibels relative to a
reference power, normally taken as 10 watt.
Sound Pressure: The local deviation from ambient pressure at a given
time instant as a result of a sound wave travelling through a medium. Sound power is
usually given in decibels SPL, that is, decibels relative to a reference power, normally
taken as 20 × 10 pascal (Pa), considered the threshold of human hearing.
6.4.5 Terms for ventilators
Adaptive Servo-Ventilator: A ventilator that has a changeable, rather than
fixed target ventilation. The changeable target ventilation may be learned from some
characteristic of the patient, for example, a respiratory characteristic of the patient.
Backup rate: A parameter of a ventilator that establishes the minimum
respiration rate (typically in number of breaths per minute) that the ventilator will
deliver to the patient, if not otherwise triggered.
Cycled: The termination of a ventilator's inspiratory phase. When a
ventilator delivers a breath to a spontaneously breathing patient, at the end of the
inspiratory portion of the breathing cycle, the ventilator is said to be cycled to stop
delivering the breath.
EPAP (or EEP): a base pressure, to which a pressure varying within the
breath is added to produce the desired mask pressure which the ventilator will attempt to
achieve at a given time.
IPAP: desired mask pressure which the ventilator will attempt to achieve
during the inspiratory portion of the breath.
Pressure support: A number that is indicative of the increase in pressure
during ventilator inspiration over that during ventilator expiration, and generally means
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the difference in pressure between the maximum value during inspiration and the
minimum value during expiration (e.g., PS = IPAP – EPAP). In some contexts pressure
support means the difference which the ventilator aims to achieve, rather than what it
actually achieves.
Servo-ventilator: A ventilator that measures patient ventilation has a target
ventilation, and which adjusts the level of pressure support to bring the patient
ventilation towards the target ventilation.
Spontaneous/Timed (S/T) – A mode of a ventilator or other device that
attempts to detect the initiation of a breath of a spontaneously breathing patient. If
however, the device is unable to detect a breath within a predetermined period of time,
the device will automatically initiate delivery of the breath.
Swing: Equivalent term to pressure support.
Triggered: When a ventilator delivers a breath of air to a spontaneously
breathing patient, it is said to be triggered to do so at the initiation of the respiratory
portion of the breathing cycle by the patient's efforts.
Ventilator: A mechanical device that provides pressure support to a
patient to perform some or all of the work of breathing.
6.4.6 Anatomy of the face
Ala: the external outer wall or "wing" of each nostril (plural: alar)
Alare: The most lateral point on the nasal ala.
Alar curvature (or alar crest) point: The most posterior point in the
curved base line of each ala, found in the crease formed by the union of the ala with the
cheek.
Auricula or Pinna: The whole external visible part of the ear.
(nose) Bony framework: The bony framework of the nose comprises the
nasal bones, the frontal process of the maxillae and the nasal part of the frontal bone.
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(nose) Cartilaginous framework: The cartilaginous framework of the nose
comprises the septal, lateral, major and minor cartilages.
Columella: the strip of skin that separates the nares and which runs from
the pronasale to the upper lip.
Columella angle: The angle between the line drawn through the midpoint
of the nostril aperture and a line drawn perpendicular to the Frankfurt horizontal while
intersecting subnasale.
Frankfort horizontal plane: A line extending from the most inferior point
of the orbital margin to the left tragion. The tragion is the deepest point in the notch
superior to the tragus of the auricle.
Glabella: Located on the soft tissue, the most prominent point in the
midsagittal plane of the forehead.
Lateral nasal cartilage: A generally triangular plate of cartilage. Its
superior margin is attached to the nasal bone and frontal process of the maxilla, and its
inferior margin is connected to the greater alar cartilage.
Greater alar cartilage: A plate of cartilage lying below the lateral nasal
cartilage. It is curved around the anterior part of the naris. Its posterior end is connected
to the frontal process of the maxilla by a tough fibrous membrane containing three or
four minor cartilages of the ala.
Nares (Nostrils): Approximately ellipsoidal apertures forming the
entrance to the nasal cavity. The singular form of nares is naris (nostril). The nares are
separated by the nasal septum.
Naso-labial sulcus or Naso-labial fold: The skin fold or groove that runs
from each side of the nose to the corners of the mouth, separating the cheeks from the
upper lip.
Naso-labial angle: The angle between the columella and the upper lip,
while intersecting subnasale.
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Otobasion inferior: The lowest point of attachment of the auricle to the
skin of the face.
Otobasion superior: The highest point of attachment of the auricle to the
skin of the face.
Pronasale: the most protruded point or tip of the nose, which can be
identified in lateral view of the rest of the portion of the head.
Philtrum: the midline groove that runs from lower border of the nasal
septum to the top of the lip in the upper lip region.
Pogonion: Located on the soft tissue, the most anterior midpoint of the
chin.
Ridge (nasal): The nasal ridge is the midline prominence of the nose,
extending from the Sellion to the Pronasale.
Sagittal plane: A vertical plane that passes from anterior (front) to
posterior (rear) dividing the body into right and left halves.
Sellion: Located on the soft tissue, the most concave point overlying the
area of the frontonasal suture.
Septal cartilage (nasal): The nasal septal cartilage forms part of the
septum and divides the front part of the nasal cavity.
Subalare: The point at the lower margin of the alar base, where the alar
base joins with the skin of the superior (upper) lip.
Subnasal point: Located on the soft tissue, the point at which the
columella merges with the upper lip in the midsagittal plane.
Supramentale: The point of greatest concavity in the midline of the lower
lip between labrale inferius and soft tissue pogonion
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6.4.7 Anatomy of the skull
Frontal bone: The frontal bone includes a large vertical portion, the
squama frontalis, corresponding to the region known as the forehead.
Mandible: The mandible forms the lower jaw. The mental protuberance is
the bony protuberance of the jaw that forms the chin.
Maxilla: The maxilla forms the upper jaw and is located above the
mandible and below the orbits. The frontal process of the maxilla projects upwards by
the side of the nose, and forms part of its lateral boundary.
Nasal bones: The nasal bones are two small oblong bones, varying in size
and form in different individuals; they are placed side by side at the middle and upper
part of the face, and form, by their junction, the "bridge" of the nose.
Nasion: The intersection of the frontal bone and the two nasal bones, a
depressed area directly between the eyes and superior to the bridge of the nose.
Occipital bone: The occipital bone is situated at the back and lower part of
the cranium. It includes an oval aperture, the foramen magnum, through which the
cranial cavity communicates with the vertebral canal. The curved plate behind the
foramen magnum is the squama occipitalis.
Orbit: The bony cavity in the skull to contain the eyeball.
Parietal bones: The parietal bones are the bones that, when joined
together, form the roof and sides of the cranium.
Temporal bones: The temporal bones are situated on the bases and sides
of the skull, and support that part of the face known as the temple.
Zygomatic bones: The face includes two zygomatic bones, located in the
upper and lateral parts of the face and forming the prominence of the cheek.
6.4.8 Anatomy of the respiratory system
Diaphragm: A sheet of muscle that extends across the bottom of the rib
cage. The diaphragm separates the thoracic cavity, containing the heart, lungs and ribs,
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from the abdominal cavity. As the diaphragm contracts the volume of the thoracic
cavity increases and air is drawn into the lungs.
Larynx: The larynx, or voice box houses the vocal folds and connects the
inferior part of the pharynx (hypopharynx) with the trachea.
Lungs: The organs of respiration in humans. The conducting zone of the
lungs contains the trachea, the bronchi, the bronchioles, and the terminal bronchioles.
The respiratory zone contains the respiratory bronchioles, the alveolar ducts, and the
alveoli.
Nasal cavity: The nasal cavity (or nasal fossa) is a large air filled space
above and behind the nose in the middle of the face. The nasal cavity is divided in two
by a vertical fin called the nasal septum. On the sides of the nasal cavity are three
horizontal outgrowths called nasal conchae (singular "concha") or turbinates. To the
front of the nasal cavity is the nose, while the back blends, via the choanae, into the
nasopharynx.
Pharynx: The part of the throat situated immediately inferior to (below)
the nasal cavity, and superior to the oesophagus and larynx. The pharynx is
conventionally divided into three sections: the nasopharynx (epipharynx) (the nasal part
of the pharynx), the oropharynx (mesopharynx) (the oral part of the pharynx), and the
laryngopharynx (hypopharynx).
6.4.9 Materials
Silicone or Silicone Elastomer: A synthetic rubber. In this specification, a
reference to silicone is a reference to liquid silicone rubber (LSR) or a compression
moulded silicone rubber (CMSR). One form of commercially available LSR is
SILASTIC (included in the range of products sold under this trademark), manufactured
by Dow Corning. Another manufacturer of LSR is Wacker. Unless otherwise specified
to the contrary, a preferred form of LSR has a Shore A (or Type A) indentation hardness
in the range of about 35 to about 45 as measured using ASTM D2240 (year?required??)
Polycarbonate: a typically transparent thermoplastic polymer of
Bisphenol-A Carbonate.
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6.4.10 Aspects of a patient interface
Anti-asphyxia valve (AAV): The component or sub-assembly of a mask
system that, by opening to atmosphere in a failsafe manner, reduces the risk of
excessive CO rebreathing by a patient.
Elbow: A conduit that directs an axis of flow of air to change direction
through an angle. In one form, the angle may be approximately 90 degrees. In another
form, the angle may be less than 90 degrees. The conduit may have an approximately
circular cross-section. In another form the conduit may have an oval or rectangular
cross-section.
Frame: Frame will be taken to mean a mask structure that bears the load
of tension between two or more points of connection with a headgear. A mask frame
may be a non-airtight load bearing structure in the mask. However, some forms of mask
frame may also be air-tight.
Headgear: Headgear will be taken to mean a form of positioning and
stabilizing structure designed for use on a head. Preferably the headgear comprises a
collection of one or more struts, ties and stiffeners configured to locate and retain a
patient interface in position on a patient’s face for delivery of respiratory therapy. Some
ties are formed of a soft, flexible, elastic material such as a laminated composite of foam
and fabric.
Membrane: Membrane will be taken to mean a typically thin element that
has, preferably, substantially no resistance to bending, but has resistance to being
stretched.
Plenum chamber: a mask plenum chamber will be taken to a mean portion
of a patient interface having walls enclosing a volume of space, the volume having air
therein pressurised above atmospheric pressure in use. A shell may form part of the
walls of a mask plenum chamber. In one form, a region of the patient's face forms one
of the walls of the plenum chamber.
Seal: The noun form ("a seal") will be taken to mean a structure or barrier
that intentionally resists the flow of air through the interface of two surfaces. The verb
form ("to seal") will be taken to mean to resist a flow of air.
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Shell: A shell will preferably be taken to mean a curved structure having
bending, tensile and compressive stiffness, for example, a portion of a mask that forms a
curved structural wall of the mask. Preferably, compared to its overall dimensions it is
relatively thin. In some forms, a shell may be faceted. Preferably such walls are airtight,
although in some forms they may not be airtight.
Stiffener: A stiffener will be taken to mean a structural component
designed to increase the bending resistance of another component in at least one
direction.
Strut: A strut will be taken to be a structural component designed to
increase the compression resistance of another component in at least one direction.
Swivel: (noun) A subassembly of components configured to rotate about a
common axis, preferably independently, preferably under low torque. In one form, the
swivel may be constructed to rotate through an angle of at least 360 degrees. In another
form, the swivel may be constructed to rotate through an angle less than 360 degrees.
When used in the context of an air delivery conduit, the sub-assembly of components
preferably comprises a matched pair of cylindrical conduits. Preferably there is little or
no leak flow of air from the swivel in use.
Tie: A tie will be taken to be a structural component designed to resist
tension.
Vent: (noun) the structure that allows a deliberate controlled rate leak of
air from an interior of the mask, or conduit to ambient air, to allow washout of exhaled
carbon dioxide (CO ) and supply of oxygen (O ).
6.4.11 Terms used in relation to patient interface
Curvature (of a surface): A region of a surface having a saddle shape,
which curves up in one direction and curves down in a different direction, will be said to
have a negative curvature. A region of a surface having a dome shape, which curves the
same way in two principle directions, will be said to have a positive curvature. A flat
surface will be taken to have zero curvature.
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Floppy: A quality of a material, structure or composite that is the
combination of features of:
Readily conforming to finger pressure.
Unable to retain its shape when caused to support its own weight.
Not rigid.
Able to be stretched or bent elastically with little effort.
The quality of being floppy may have an associated direction, hence a
particular material, structure or composite may be floppy in a first direction, but stiff or
rigid in a second direction, for example a second direction that is orthogonal to the first
direction.
Resilient: Able to deform substantially elastically, and to release
substantially all of the energy upon unloading, within a relatively short period of time
such as 1 second.
Rigid: Not readily deforming to finger pressure, and/or the tensions or
loads typically encountered when setting up and maintaining a patient interface in
sealing relationship with an entrance to a patient's airways.
Semi-rigid: means being sufficiently rigid to not substantially distort
under the effects of mechanical forces typically applied during positive airway pressure
therapy.
6.5 OTHER REMARKS
A portion of the disclosure of this patent document contains material
which is subject to copyright protection. The copyright owner has no objection to the
facsimile reproduction by anyone of the patent document or the patent disclosure, as it
appears in the Patent and Trademark Office patent file or records, but otherwise reserves
all copyright rights whatsoever.
Unless the context clearly dictates otherwise and where a range of values
is provided, it is understood that each intervening value, to the tenth of the unit of the
lower limit, between the upper and lower limit of that range, and any other stated or
intervening value in that stated range is encompassed within the technology. The upper
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and lower limits of these intervening ranges, which may be independently included in
the intervening ranges, are also encompassed within the technology, subject to any
specifically excluded limit in the stated range. Where the stated range includes one or
both of the limits, ranges excluding either or both of those included limits are also
included in the technology.
Furthermore, where a value or values are stated herein as being
implemented as part of the technology, it is understood that such values may be
approximated, unless otherwise stated, and such values may be utilized to any suitable
significant digit to the extent that a practical technical implementation may permit or
require it.
Unless defined otherwise, all technical and scientific terms used herein
have the same meaning as commonly understood by one of ordinary skill in the art to
which this technology belongs. Although any methods and materials similar or
equivalent to those described herein can also be used in the practice or testing of the
present technology, a limited number of the exemplary methods and materials are
described herein.
When a particular material is identified as being preferably used to
construct a component, obvious alternative materials with similar properties may be
used as a substitute. Furthermore, unless specified to the contrary, any and all
components herein described are understood to be capable of being manufactured and,
as such, may be manufactured together or separately.
It must be noted that as used herein and in the appended claims, the
singular forms "a", "an", and "the" include their plural equivalents, unless the context
clearly dictates otherwise.
All publications mentioned herein are incorporated by reference to
disclose and describe the methods and/or materials which are the subject of those
publications. The publications discussed herein are provided solely for their disclosure
prior to the filing date of the present application. Nothing herein is to be construed as an
admission that the present technology is not entitled to antedate such publication by
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virtue of prior invention. Further, the dates of publication provided may be different
from the actual publication dates, which may need to be independently confirmed.
The subject headings used in the detailed description are included only for
the ease of reference of the reader and should not be used to limit the subject matter
found throughout the disclosure or the claims. The subject headings should not be used
in construing the scope of the claims or the claim limitations.
Although the technology herein has been described with reference to
particular examples, it is to be understood that these examples are merely illustrative of
the principles and applications of the technology. In some instances, the terminology
and symbols may imply specific details that are not required to practice the technology.
For example, although the terms "first" and "second" may be used, unless otherwise
specified, they are not intended to indicate any order but may be utilised to distinguish
between distinct elements. Furthermore, although process steps in the methodologies
may be described or illustrated in an order, such an ordering is not required. Those
skilled in the art will recognize that such ordering may be modified and/or aspects
thereof may be conducted concurrently or even synchronously.
It is therefore to be understood that numerous modifications may be made
to the illustrative examples and that other arrangements may be devised without
departing from the spirit and scope of the technology.
Unless the context clearly requires otherwise, throughout the description
and the claims, the words “comprise”, “comprising”, and the like, are to be construed
in an inclusive sense as opposed to an exclusive sense, that is to say, in the sense of
“including, but not limited to”.
2360837
JAWS REF: 505767/60
Claims (3)
1. A patient interface system to treat a respiratory disorder of a patient, the patient interface system comprising: a positioning and stabilising structure including a back portion, a first upper strap and a second upper strap which extend from the back portion, and a first lower strap and a second lower strap which extend from the back portion; a patient interface that includes a frame, a plenum chamber, and a seal- forming structure, the frame being releasably attachable to the plenum chamber; and a first rigidiser arm that is attached to the frame at a first connection point and a second rigidiser arm that is attached to the frame at a second connection point, wherein the first upper strap and the second upper strap are positioned and arranged to be in use substantially parallel to the patient’s Frankfort horizontal plane, and wherein the frame comprises a first lower attachment point for releasable attachment to the first lower strap and a second lower attachment point for releasable attachment to the second lower strap.
2. A patient interface system as claimed in claim 1, wherein the first upper strap and the second upper strap are vertically offset to the patient’s Frankfort horizontal plane.
3. A patient interface system as claimed in claim 1 or 2, wherein the connection points are located in a plane which is substantially parallel to the patient’s Frankfort horizontal plane. JAWS REF:
Priority Applications (26)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ783187A NZ783187A (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| EP19213180.3A EP3693046B1 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| JP2016526378A JP6336589B2 (en) | 2013-07-17 | 2014-07-17 | Patient interface system for treatment of respiratory diseases |
| CN201480040004.0A CN105377349B (en) | 2013-07-17 | 2014-07-17 | The patient interface systems for treating respiratory disorder |
| NZ733922A NZ733922A (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| EP14826187.8A EP3021923B1 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| CN201910404562.5A CN110251793B (en) | 2013-07-17 | 2014-07-17 | Patient interface system for treating respiratory disorders |
| NZ768186A NZ768186B2 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| NZ761079A NZ761079B2 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| NZ736310A NZ736310A (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| NZ631170A NZ631170A (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| CN202210330183.8A CN114887178A (en) | 2013-07-17 | 2014-07-17 | Patient interface system for treating respiratory disorders |
| NZ752310A NZ752310A (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| AU2014292823A AU2014292823B2 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| PCT/AU2014/050127 WO2015006826A1 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| US14/904,176 US20160144144A1 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| EP23210564.3A EP4368228A3 (en) | 2013-07-17 | 2014-07-17 | A patient interface system for treatment of respiratory disorders |
| TW108129639A TWI707704B (en) | 2014-03-14 | 2015-03-13 | A patient interface system for treatment of respiratory disorders |
| TW109131308A TWI751691B (en) | 2014-03-14 | 2015-03-13 | A patient interface system for treatment of respiratory disorders |
| TW110144000A TWI811865B (en) | 2014-03-14 | 2015-03-13 | A patient interface system for treatment of respiratory disorders |
| TW104108019A TWI672158B (en) | 2014-03-14 | 2015-03-13 | A patient interface system for treatment of respiratory disorders |
| JP2018088742A JP6978376B2 (en) | 2013-07-17 | 2018-05-02 | Patient interface system for the treatment of respiratory diseases |
| JP2020066707A JP6983943B2 (en) | 2013-07-17 | 2020-04-02 | Patient interface system for the treatment of respiratory diseases |
| JP2021189431A JP7247309B2 (en) | 2013-07-17 | 2021-11-22 | Patient interface system for treatment of respiratory disease |
| JP2023038600A JP2023072024A (en) | 2013-07-17 | 2023-03-13 | Patient interface system for treatment of respiratory disorders |
| US18/413,159 US20240148998A1 (en) | 2013-07-17 | 2024-01-16 | Patient interface system for treatment of respiratory disorders |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361847415P | 2013-07-17 | 2013-07-17 | |
| US61/847,415 | 2013-07-17 | ||
| US201461953240P | 2014-03-14 | 2014-03-14 | |
| US61/953,240 | 2014-03-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ626417A NZ626417A (en) | 2016-03-31 |
| NZ626417B true NZ626417B (en) | 2016-07-01 |
Family
ID=
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