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WO2002081001A2 - Medical gas consumption recorder - Google Patents

Medical gas consumption recorder Download PDF

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Publication number
WO2002081001A2
WO2002081001A2 PCT/ZA2002/000059 ZA0200059W WO02081001A2 WO 2002081001 A2 WO2002081001 A2 WO 2002081001A2 ZA 0200059 W ZA0200059 W ZA 0200059W WO 02081001 A2 WO02081001 A2 WO 02081001A2
Authority
WO
WIPO (PCT)
Prior art keywords
recorder
gas
pressure switch
housing
measuring means
Prior art date
Application number
PCT/ZA2002/000059
Other languages
French (fr)
Other versions
WO2002081001A3 (en
Inventor
Barnard Thomas Shannon Nel
Original Assignee
Barnard Thomas Shannon Nel
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Barnard Thomas Shannon Nel filed Critical Barnard Thomas Shannon Nel
Priority to AU2002254781A priority Critical patent/AU2002254781A1/en
Publication of WO2002081001A2 publication Critical patent/WO2002081001A2/en
Publication of WO2002081001A3 publication Critical patent/WO2002081001A3/en
Priority to ZA2003/08085A priority patent/ZA200308085B/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/091—Measuring volume of inspired or expired gases, e.g. to determine lung capacity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F13/00—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
    • G01F13/006—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups measuring volume in function of time
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/097—Devices for facilitating collection of breath or for directing breath into or through measuring devices

Definitions

  • the invention relates to a medical gas consumption recorder.
  • the invention relates to a bedside gas consumption recorder for use in hospitals, infirmaries, and at any sick bed.
  • the inventor is aware that at present, when a gas, such as oxygen, is administered to a patient in a hospital, neither the patient, nor the hospital, nor the patient's medical insurance or medical aid can accurately determine the amount of oxygen consumed over the period of stay of the patient in the hospital.
  • a gas such as oxygen
  • the inventor is aware that at present the flow rate of medical gasses are measured at the point of administration by the use of a pressure regulator and rotameter type flowmeters. A nurse or other medical staff will periodically note down the flowrate and this will form the basis of the determination of the total amount of a medical gas administered to a patient. This type of system does not take factors into account such as flow rate variations, patients turning off the gas flow when not being monitored, technical problems, and the like.
  • the invention provides a medical gas consumption recorder, said recorder including: a pressure switch located in gas flow communication with a gas of which the consumption is to be measured; measuring means operatively connected to the pressure switch and configured to record a measurement when the pressure switch detects a preset minimum gas pressure; and electronic circuit means for operatively connecting the pressure switch to the measuring means, for displaying the total measurement over a measuring period, and for processing of data associated with the measuring means.
  • the recorder may include a housing, having an LED display connected to the electronic circuit means, and a gas inlet, the pressure switch being located at least partially within the housing.
  • the housing may include a gas outlet.
  • the housing may include a gas flow passage located between the inlet and the outlet.
  • the recorder may include reset means for resetting the displayed value, for example, once the measurement has been recorded in paper or other format.
  • the electronic circuit means may be a PC-board.
  • the reset means may be in the form of a button located on the housing, this reset button may be pressed to zero the display.
  • the recorder may operate on 12V DC.
  • the pressure switch of the recorder is connected in gas flow communication with a regulator, a flow meter, a wall mounted gas connection, a gas cylinder, or the like.
  • the pressure switch is connected in gas flow communication with a face mask, a nose piece, or other gas administering device.
  • the gas flow is activated, for example by actuating the regulator or flowmeter, the gas pressure increases on the pressure switch thereby activating the pressure switch which in turn activates the measuring means and any associated portion of the electronic circuit means whereby the measured value is displayed on the LED display.
  • the pressure switch deactivates the measuring means and any associated portion of the electronic circuit means thereby ceasing to increase the measured value which is being displayed on the LED.
  • the measuring means may be a timer, in which case the instantaneous or the average flow rate of the medical gas is known, and the period of time for which a flow is detected is directly related to the quantity of gas administered to the patient.
  • a nurse or member of staff may record the reading on the LED display on a medical chart so that a correct analysis of the course of treatment, as well as of the total quantity of gas administered is recorded.
  • the medical chart may be a modified medical chart including a field for recording the measured gas administered.
  • the recorder may be connected to a chart recorder so that the measurement is automatically recorded on a chart for later analysis, if required.
  • the recorder may include network connection means for connecting the recorder to a computer network so that the measurement may be transmitted to a remote location, and optionally, the recorder may be controlled from the remote location.
  • the recorder may include an automatic shut off valve responsive to the activation of the pressure switch.
  • Figure 1 shows a flow sheet showing how the recorder of the invention is connected to a medical gas supply and to a patient
  • Figure 2 shows a circuit diagram of a PC-board used for the recorder of the invention.
  • reference numeral 10 generally indicates a medical gas consumption recorder broadly in accordance with the invention.
  • the recorder 10 includes a housing 12, in which housing is located a pressure switch 14, an LED display 16, and a reset button 18.
  • An inlet 20 provides access for the gas to the pressure switch 14 within the housing 12.
  • the pressure switch 14 is an MPL 500 available from Micropneumatic Logic Inc.
  • the recorder 10 is connected downstream of a gas source 22, a regulator 24 and a rotameter type flowmeter 26.
  • a pipe or hose 28 having a tee-piece 30 provides the gas to the patient 32 as well as directing gas to the pressure switch 14.
  • the gas flow When the gas flow is activated, for example by actuating the regulator 24 or flowmeter 26, the gas pressure increases in the hose 28 and thus on the pressure switch 14 thereby activating the pressure switch 14 which in turn activates a measuring means 34 located within the housing 12 and any associated portion of the electronic circuit means 50 ( Figure 2) whereby the measured value is displayed on the LED display 16.
  • the pressure switch deactivates the measuring means 34 and any associated portion of the electronic circuit means 50 thereby ceasing to increase the measured value which is being displayed on the LED 16.
  • the measuring means 34 is a timer.
  • the period of time for which a flow in pipe 28 is detected is directly related to the quantity of gas administered to the patient.
  • a nurse records the reading on display 16 onto a modified medical chart and thus the total amount of gas administered to a patient is calculable over the period of treatment.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pulmonology (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • General Physics & Mathematics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Physiology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The recorder (10) includes a housing (12), in which housing is located a pressure switch (14), an LED display (16), and a reset button (18). An inlet (20) provides access for teh gas to the pressure switch (14) within the housing (12). The recorder (10) is connected downstream of a gas source (22), a regulator (24) and a flowmeter (26). A pipe or hose (28) having a tee-piece (30) provides the gas to teh patient (32) as well as directing gas to teh pressure switch (14). When the gas flow is activated, for example by actuating the regulator (24) or flowmeter (26), the gas pressure increases in the hose (28) and thus on the pressure switch (14) thereby activating the pressure switch (14) which in turn activates a measuring means (34) located within the housing (12) and any associated portion of the electronic circuit means whereby the measured value is displayed on the LED display (16).

Description

MEDICAL GAS CONSUMPTION RECORDER
Field of the Invention
The invention relates to a medical gas consumption recorder. In particular the invention relates to a bedside gas consumption recorder for use in hospitals, infirmaries, and at any sick bed.
Background to the Invention
The inventor is aware that at present, when a gas, such as oxygen, is administered to a patient in a hospital, neither the patient, nor the hospital, nor the patient's medical insurance or medical aid can accurately determine the amount of oxygen consumed over the period of stay of the patient in the hospital.
The inventor is aware that at present the flow rate of medical gasses are measured at the point of administration by the use of a pressure regulator and rotameter type flowmeters. A nurse or other medical staff will periodically note down the flowrate and this will form the basis of the determination of the total amount of a medical gas administered to a patient. This type of system does not take factors into account such as flow rate variations, patients turning off the gas flow when not being monitored, technical problems, and the like.
There is a need to correctly record the total amount of medical gasses consumed in treating a specific patient so that costs may be accurately allocated to patients and so that medical insurance and medical aid associations do not pay for medical gasses not used on their clients. Also, clinics and hospitals have a need for accurate accounting for gas consumed versus gas purchased, detection of leaks and errors in recording of gas consumption.
Summary of the Invention
The invention provides a medical gas consumption recorder, said recorder including: a pressure switch located in gas flow communication with a gas of which the consumption is to be measured; measuring means operatively connected to the pressure switch and configured to record a measurement when the pressure switch detects a preset minimum gas pressure; and electronic circuit means for operatively connecting the pressure switch to the measuring means, for displaying the total measurement over a measuring period, and for processing of data associated with the measuring means.
The recorder may include a housing, having an LED display connected to the electronic circuit means, and a gas inlet, the pressure switch being located at least partially within the housing.
The housing may include a gas outlet.
The housing may include a gas flow passage located between the inlet and the outlet.
The recorder may include reset means for resetting the displayed value, for example, once the measurement has been recorded in paper or other format.
The electronic circuit means may be a PC-board.
The reset means may be in the form of a button located on the housing, this reset button may be pressed to zero the display.
The recorder may operate on 12V DC.
In use, the pressure switch of the recorder is connected in gas flow communication with a regulator, a flow meter, a wall mounted gas connection, a gas cylinder, or the like.
Further, the pressure switch is connected in gas flow communication with a face mask, a nose piece, or other gas administering device. When the gas flow is activated, for example by actuating the regulator or flowmeter, the gas pressure increases on the pressure switch thereby activating the pressure switch which in turn activates the measuring means and any associated portion of the electronic circuit means whereby the measured value is displayed on the LED display.
When the gas flow is stopped, or reduced to a low level whereby the pressure on the pressure switch is insufficient to maintain the activation of the pressure switch, the pressure switch deactivates the measuring means and any associated portion of the electronic circuit means thereby ceasing to increase the measured value which is being displayed on the LED.
The measuring means may be a timer, in which case the instantaneous or the average flow rate of the medical gas is known, and the period of time for which a flow is detected is directly related to the quantity of gas administered to the patient.
A nurse or member of staff may record the reading on the LED display on a medical chart so that a correct analysis of the course of treatment, as well as of the total quantity of gas administered is recorded.
The medical chart may be a modified medical chart including a field for recording the measured gas administered.
The recorder may be connected to a chart recorder so that the measurement is automatically recorded on a chart for later analysis, if required.
The recorder may include network connection means for connecting the recorder to a computer network so that the measurement may be transmitted to a remote location, and optionally, the recorder may be controlled from the remote location.
The recorder may include an automatic shut off valve responsive to the activation of the pressure switch. As will be clear to those skilled in the art, there are many possible variants of the specific embodiment which is described below, however, the scope of this patent application is not limited to the specific embodiment described below and all embodiments falling within the scope and spirit of this invention are included herein as if specifically described therein.
Specific Description of the Invention
The invention will now be described, by way of non-limiting example only, with reference to the accompanying diagrammatic drawings.
In the drawings,
Figure 1 shows a flow sheet showing how the recorder of the invention is connected to a medical gas supply and to a patient; and
Figure 2 shows a circuit diagram of a PC-board used for the recorder of the invention.
In Figure 1, reference numeral 10 generally indicates a medical gas consumption recorder broadly in accordance with the invention.
The recorder 10 includes a housing 12, in which housing is located a pressure switch 14, an LED display 16, and a reset button 18. An inlet 20 provides access for the gas to the pressure switch 14 within the housing 12. The pressure switch 14 is an MPL 500 available from Micropneumatic Logic Inc.
The recorder 10 is connected downstream of a gas source 22, a regulator 24 and a rotameter type flowmeter 26. A pipe or hose 28 having a tee-piece 30 provides the gas to the patient 32 as well as directing gas to the pressure switch 14.
When the gas flow is activated, for example by actuating the regulator 24 or flowmeter 26, the gas pressure increases in the hose 28 and thus on the pressure switch 14 thereby activating the pressure switch 14 which in turn activates a measuring means 34 located within the housing 12 and any associated portion of the electronic circuit means 50 (Figure 2) whereby the measured value is displayed on the LED display 16.
When the gas flow is stopped, or reduced to a low level whereby the pressure on the pressure switch 14 is insufficient to maintain the activation of the pressure switch 14, the pressure switch deactivates the measuring means 34 and any associated portion of the electronic circuit means 50 thereby ceasing to increase the measured value which is being displayed on the LED 16.
In the embodiment shown, the measuring means 34 is a timer. Thus, with the instantaneous or the average flow rate of the medical gas in pipe 28 being known, the period of time for which a flow in pipe 28 is detected is directly related to the quantity of gas administered to the patient.
A nurse records the reading on display 16 onto a modified medical chart and thus the total amount of gas administered to a patient is calculable over the period of treatment.

Claims

Claims
1. A medical gas consumption recorder, said recorder including: a pressure switch located in gas flow communication with a gas of which the consumption is to be measured; measuring means operatively connected to the pressure switch and configured to record a measurement when the pressure switch detects a preset minimum gas pressure; and electronic circuit means for operatively connecting the pressure switch to the measuring means, for displaying the total measurement over a measuring period, and for processing of data associated with the measuring means.
2. A recorder as claimed in claim 1 , including a housing, having an LED display connected to the electronic circuit means, and a gas inlet, the pressure switch being located at least partially within the housing.
3. A recorder as claimed in claim 2, wherein the housing includes a gas outlet.
4. A recorder as claimed in claim 3, wherein the housing includes a gas flow passage located between the inlet and the outlet.
5. A recorder as claimed in any one of the preceding claims, including reset means for resetting the displayed value.
6. A recorder as claimed in any one of the preceding claims, wherein the electronic circuit means is a PC-board.
7. A recorder as claimed in any one of the preceding claims, in which the measuring means is a timer, in which case the instantaneous or the average flow rate of the medical gas is known, and the period of time for which a flow is detected is directly related to the quantity of gas administered to the patient.
8. A recorder as claimed in any one of the preceding claims, including network connection means for connecting the recorder to a computer network so that the measurement may be transmitted to a remote location, and optionally, the recorder may controlled from the remote location.
9. A recorder as claimed in claim 1, substantially as herein described and illustrated.
10. A new recorder substantially as herein described.
PCT/ZA2002/000059 2001-04-05 2002-04-05 Medical gas consumption recorder WO2002081001A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002254781A AU2002254781A1 (en) 2001-04-05 2002-04-05 Medical gas consumption recorder
ZA2003/08085A ZA200308085B (en) 2001-04-05 2003-10-17 Medical gas consumption recorder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2001/2792 2001-04-05
ZA200102792 2001-04-05

Publications (2)

Publication Number Publication Date
WO2002081001A2 true WO2002081001A2 (en) 2002-10-17
WO2002081001A3 WO2002081001A3 (en) 2003-02-13

Family

ID=25589128

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2002/000059 WO2002081001A2 (en) 2001-04-05 2002-04-05 Medical gas consumption recorder

Country Status (3)

Country Link
AU (1) AU2002254781A1 (en)
WO (1) WO2002081001A2 (en)
ZA (1) ZA200308085B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2472214A (en) * 2009-07-28 2011-02-02 Mpb Ind Ltd Thermistor apparatus for measuring anaesthetic gas flow
WO2014188108A1 (en) * 2013-05-23 2014-11-27 Air Liquide Sante Services Device and method for measuring a gas consumption period in a hospital building

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4579115A (en) * 1983-01-17 1986-04-01 Dragerwerk Ag Device for supplying breathing gas into a closed ventilating circuit of a medical respirator
US5715812A (en) * 1992-12-09 1998-02-10 Nellcor Puritan Bennett Compliance meter for respiratory therapy

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4579115A (en) * 1983-01-17 1986-04-01 Dragerwerk Ag Device for supplying breathing gas into a closed ventilating circuit of a medical respirator
US5715812A (en) * 1992-12-09 1998-02-10 Nellcor Puritan Bennett Compliance meter for respiratory therapy

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2472214A (en) * 2009-07-28 2011-02-02 Mpb Ind Ltd Thermistor apparatus for measuring anaesthetic gas flow
GB2472214B (en) * 2009-07-28 2014-07-30 Mpb Ind Ltd Apparatus for measuring anaesthetic gas flow
WO2014188108A1 (en) * 2013-05-23 2014-11-27 Air Liquide Sante Services Device and method for measuring a gas consumption period in a hospital building
FR3006052A1 (en) * 2013-05-23 2014-11-28 Air Liquide Sante Services DEVICE AND METHOD FOR MEASURING THE DURATION OF GAS CONSUMPTION IN A HOSPITAL BUILDING

Also Published As

Publication number Publication date
AU2002254781A1 (en) 2002-10-21
WO2002081001A3 (en) 2003-02-13
ZA200308085B (en) 2005-01-26

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