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WO2009010076A1 - Trocar with two convex distal surfaces - Google Patents

Trocar with two convex distal surfaces Download PDF

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Publication number
WO2009010076A1
WO2009010076A1 PCT/EP2007/006252 EP2007006252W WO2009010076A1 WO 2009010076 A1 WO2009010076 A1 WO 2009010076A1 EP 2007006252 W EP2007006252 W EP 2007006252W WO 2009010076 A1 WO2009010076 A1 WO 2009010076A1
Authority
WO
WIPO (PCT)
Prior art keywords
distal
trocar
ridge
cylindrical section
convex surfaces
Prior art date
Application number
PCT/EP2007/006252
Other languages
French (fr)
Other versions
WO2009010076A8 (en
Inventor
Axel Cremer
Helge Giersch
Original Assignee
Stryker Trauma Gmbh
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 Stryker Trauma Gmbh filed Critical Stryker Trauma Gmbh
Priority to PCT/EP2007/006252 priority Critical patent/WO2009010076A1/en
Priority to DE202008009288U priority patent/DE202008009288U1/en
Publication of WO2009010076A1 publication Critical patent/WO2009010076A1/en
Publication of WO2009010076A8 publication Critical patent/WO2009010076A8/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/0084—Material properties low friction
    • A61B2017/00849—Material properties low friction with respect to tissue, e.g. hollow organs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
    • A61B17/06—Needles ; Sutures; Needle-suture combinations; Holders or packages for needles or suture materials
    • A61B17/06066—Needles, e.g. needle tip configurations
    • A61B2017/06071—Needles, e.g. needle tip configurations with an abrupt angle formed between two adjacent sections
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/34—Trocars; Puncturing needles
    • A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
    • A61B2017/3454—Details of tips

Definitions

  • the present invention relates to a trocar which is designed to penetrate e.g. an abdominal wall
  • Disposable trocars are used together with tubular sheath at present as devices that guide medical instrument into a patient.
  • U.S. Patent 5, 314, 417 discloses a needle unit and a tubular sheath, wherein the trocar is pointed at its distal end and can penetrate an abdominal wall.
  • a fracture may be supplied with e.g. a nail or screws securing a plate.
  • tubular sheaths are used here.
  • a needle unit the so-called trocar, is used with an outer diameter equal to the inner diameter of the said tubular sheath.
  • a trocar that is designed such that it slides more easily through human tissue and may be restrict the tissue harm to an unavoidable minimum.
  • a trocar comprises an elongated cylindrical section with a radius R and a distal part adjacent to the cylindrical section.
  • the distal part comprises two convex surfaces.
  • the two convex surfaces are sy mmetrical to each other with respect to an axis of the trocar.
  • the distal part further comprises two curved ridges. Each curved ridge is defined by one of the two convex surfaces and the adjacent cylindrical section. Two endpoints of each lateral curved ridge spanning a chord at a distal end of the distal part.
  • the distal part further comprises a rounded distal ridge at the distal end, the distal ridge is defined by the two convex surfaces. The length of each chord and the length of the distal ridge is equal to the radius R of the cylindrical section.
  • the trocar has a flattened blade-shaped tip to better penetrate tissue.
  • the two convex surfaces defining an acute apex angle which complies with a bevel angle of a sheath used with the trocar.
  • distal can be interpreted such that distal means away from a surgeon during an operation.
  • the convex surfaces have a radius of curvature in a range between 2 mm and 12 mm, preferably between 4 mm and 8 mm, more preferably between 5 mm and 7 mm.
  • the radius R of the cylindrical section is in a range between 1,5 mm and 5 mm, preferably between 2,5 mm and 3,5 mm.
  • the distal ridge has a radius of curvature of about 3 mm at most, preferably in a range between 0,05 mm and 0,4 mm.
  • the elongated cylindrical section has a length in a range between 40 mm and 180 mm, preferably between 110 mm and 140 mm.
  • the distal part has a length in a range between 4 mm and 30 mm.
  • the two convex surfaces defining an acute apex angle ( ⁇ ) with a range from 20° to 60°, preferably from 25° to 40°.
  • Fig. 1 shows a schematic side view of a trocar according to an embodiment of the present invention.
  • Fig. 2 shows a further side view onto the distal extremit of the trocar according to Fig. 1.
  • Fig. 3 to Fig. 7 show different perspective views of the trocar.
  • Fig. 1 and Fig. 2 show a trocar 1 with a an elongated cylindrical section 2 with 137,1 mm length and a radius R of 2,95 mm, and a distal part 3 with a axial length of 10,4 mm adjacent to the cylindrical section 2.
  • the distal part 3 comprises two convex surfaces 4a, 4b.
  • the two convex surfaces 4a, 4b are symmetrical to each other with respect to an axis 5 of the trocar 1.
  • the distal part 3 further comprises two curved ridges 6a, 6b.
  • Each curved ridge 6a, 6b is defined by one of the two convex surfaces 4a, 4b and the adjacent cylindrical section 2.
  • Two endpoints 7a, 8a, 7b, 8b of each lateral curved ridge 6a, 6b geometrically span a chord 9a, 9b at a distal end 10 of the distal part 3.
  • the distal part 3 further comprises a rounded distal ridge 11 at the distal end 10, the distal ridge is defined by the two convex surfaces 4a, 4b each has a radius of curvature of 6 mm. Further, two endpoints of the distal ridge 11 geometrically span a chord 9c at a distal end 10 of the distal part 3. Further, the two convex surfaces 4a, 4b define an acute apex angle ( ⁇ ) of 30°.
  • the distal ridge has a radius of curvature of 0,2 mm.
  • the length of the said three chords is equal to the radius R of the cylindrical section 2. In this embodiment the chords of the lateral curved ridges and the distal ridge, and the associated end points are in line with each other.
  • Figs. 3 to 7 show a trocar in different perspectives.
  • Fig. 6 shows a sheath with an inner diameter of 5,9 mm.

Landscapes

  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

A trocar (1) comprising an elongated cylindrical section (2) with a radius R and a distal part (3) adjacent to the cylindrical section is described. The distal part comprises two convex surfaces (4a, 4b); wherein the two convex surfaces are symmetrical to each other with respect to an axis (5) of the trocar. The distal part further comprises two curved ridges (6a, 6b), wherein each curved ridge is defined by one of the two convex surfaces and the adjacent cylindrical section, wherein two endpoints (7a, 8a, 7b, 8b) of each lateral curved ridge spanning a chord (9a, 9b) at a- distal end of the- distal part. The distal part further comprises a rounded distal ridge (11) at the distal end, the distal ridge is defined by the two convex surfaces; wherein two endpoints of the distal ridge spanning a chord (9c) at the distal end of the distal part; and wherein the length of each of said chord is equal to the radius R of the cylindrical section.

Description

Trocar with two convex distal surfaces
Field of the invention
The present invention relates to a trocar which is designed to penetrate e.g. an abdominal wall
Technical background
Disposable trocars are used together with tubular sheath at present as devices that guide medical instrument into a patient. U.S. Patent 5, 314, 417 discloses a needle unit and a tubular sheath, wherein the trocar is pointed at its distal end and can penetrate an abdominal wall.
In osteosynthesis a fracture may be supplied with e.g. a nail or screws securing a plate. To arrive e.g. with the screws at the bone without harming the surrounding tissue, tubular sheaths are used here. To occlude the tubular sheath, a needle unit, the so-called trocar, is used with an outer diameter equal to the inner diameter of the said tubular sheath.
There may be a need for a trocar that is designed such that it slides more easily through human tissue and may be restrict the tissue harm to an unavoidable minimum.
Summary of the invention
This need may be met by a trocar according to the independent claim. Embodiments of the invention are described in the dependent claims.
According to a first aspect of the present invention, a trocar comprises an elongated cylindrical section with a radius R and a distal part adjacent to the cylindrical section. The distal part comprises two convex surfaces. The two convex surfaces are sy mmetrical to each other with respect to an axis of the trocar. The distal part further comprises two curved ridges. Each curved ridge is defined by one of the two convex surfaces and the adjacent cylindrical section. Two endpoints of each lateral curved ridge spanning a chord at a distal end of the distal part. The distal part further comprises a rounded distal ridge at the distal end, the distal ridge is defined by the two convex surfaces. The length of each chord and the length of the distal ridge is equal to the radius R of the cylindrical section.
Preferably, the trocar has a flattened blade-shaped tip to better penetrate tissue. The two convex surfaces defining an acute apex angle which complies with a bevel angle of a sheath used with the trocar.
In the following, possible details and advantages of the present invention according to the first aspect and embodiments thereof will be explained.
Herein, the term "distal" can be interpreted such that distal means away from a surgeon during an operation.
According to an embodiment of the present invention the convex surfaces have a radius of curvature in a range between 2 mm and 12 mm, preferably between 4 mm and 8 mm, more preferably between 5 mm and 7 mm.
According to a further embodiment, the radius R of the cylindrical section is in a range between 1,5 mm and 5 mm, preferably between 2,5 mm and 3,5 mm.
According to a further embodiment, the distal ridge has a radius of curvature of about 3 mm at most, preferably in a range between 0,05 mm and 0,4 mm.
According to a further embodiment, the elongated cylindrical section has a length in a range between 40 mm and 180 mm, preferably between 110 mm and 140 mm.. According to a further embodiment, the distal part has a length in a range between 4 mm and 30 mm.
According to a further embodiment, the two convex surfaces defining an acute apex angle (θ) with a range from 20° to 60°, preferably from 25° to 40°.
The aspects defined above and further aspects, features and advantages of the present invention can be derived from the examples of embodiments described hereinafter.
The invention will be described in more detail hereinafter with reference to examples of embodiments but to which the invention is not limited.
Brief description of the drawings
Fig. 1 shows a schematic side view of a trocar according to an embodiment of the present invention.
Fig. 2 shows a further side view onto the distal extremit of the trocar according to Fig. 1.
Fig. 3 to Fig. 7 show different perspective views of the trocar.
In the figures, reference signs designate like elements. Furthermore, it is to be noted that the figures showing the perspective views are only schematically and not to scale.
Fig. 1 and Fig. 2 show a trocar 1 with a an elongated cylindrical section 2 with 137,1 mm length and a radius R of 2,95 mm, and a distal part 3 with a axial length of 10,4 mm adjacent to the cylindrical section 2. The distal part 3 comprises two convex surfaces 4a, 4b. The two convex surfaces 4a, 4b are symmetrical to each other with respect to an axis 5 of the trocar 1. The distal part 3 further comprises two curved ridges 6a, 6b. Each curved ridge 6a, 6b is defined by one of the two convex surfaces 4a, 4b and the adjacent cylindrical section 2. Two endpoints 7a, 8a, 7b, 8b of each lateral curved ridge 6a, 6b geometrically span a chord 9a, 9b at a distal end 10 of the distal part 3.
The distal part 3 further comprises a rounded distal ridge 11 at the distal end 10, the distal ridge is defined by the two convex surfaces 4a, 4b each has a radius of curvature of 6 mm. Further, two endpoints of the distal ridge 11 geometrically span a chord 9c at a distal end 10 of the distal part 3. Further, the two convex surfaces 4a, 4b define an acute apex angle (θ) of 30°. The distal ridge has a radius of curvature of 0,2 mm. The length of the said three chords is equal to the radius R of the cylindrical section 2. In this embodiment the chords of the lateral curved ridges and the distal ridge, and the associated end points are in line with each other.
The Figs. 3 to 7 show a trocar in different perspectives. Fig. 6 shows a sheath with an inner diameter of 5,9 mm.
It should be noted that the term "comprising" does not exclude other elements or steps and the "a" or "one" does not exclude a plurality. Also elements described in association with different embodiments and aspects may be combined. It should also be noted that reference signs in the claims shall not be construed as limiting the scope of the claims.

Claims

C L A I M S
1. A trocar comprising an elongated cylindrical section with a radius R; and a distal part adjacent to the cylindrical section; wherein the distal part comprises two convex surfaces; wherein the two convex surfaces are symmetrical to each other with respect to an axis of the trocar; wherein the distal part further comprises two curved ridges; wherein each curved ridge is defined by one of the two convex surfaces and the adjacent cylindrical section; wherein two endpoints of each lateral curved ridge spanning a chord at a distal end of the distal part; wherein the distal part further comprises a rounded distal ridge at the distal end, the distal ridge is defined by the two convex surfaces; wherein two endpoints of the distal ridge spanning a chord at the distal end of the distal part; and wherein the length of each chord is equal to the radius R of the cylindrical section.
2. The trocar according to claim 1, wherein the convex surfaces have a radius of curvature in a range between 2 mm and 12 mm, preferably between 4 mm and 8 mm, more preferably between 5 mm and 7 mm.
3. The trocar according to claim 1, wherein the radius R of the cylindrical section is in a range between 1 ,5 mm and 5 mm, preferably between 2,5 mm and 3,5 mm.
4. The trocar according to claim 1, wherein the distal ridge has a radius of curvature of about 3 mm at most, preferably in a range between 0,05 mm and 0,4 mm.
5. The trocar according to claim 1, wherein the elongated cylindrical section has a length in a range between 40 mm and 180 mm, preferably between 110 mm and 140 mm..
6. The trocar according to claim 1, wherein the distal part has a length in a range between 4 mm and 30 mm.
7. The trocar according to claim 1, wherein the two convex surfaces defining an acute apex angle (θ) with a range from 20° to 60°, preferably from 25° to 40°.
PCT/EP2007/006252 2007-07-13 2007-07-13 Trocar with two convex distal surfaces WO2009010076A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2007/006252 WO2009010076A1 (en) 2007-07-13 2007-07-13 Trocar with two convex distal surfaces
DE202008009288U DE202008009288U1 (en) 2007-07-13 2008-07-10 Trocar with grain tip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/006252 WO2009010076A1 (en) 2007-07-13 2007-07-13 Trocar with two convex distal surfaces

Publications (2)

Publication Number Publication Date
WO2009010076A1 true WO2009010076A1 (en) 2009-01-22
WO2009010076A8 WO2009010076A8 (en) 2009-03-26

Family

ID=39166320

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/006252 WO2009010076A1 (en) 2007-07-13 2007-07-13 Trocar with two convex distal surfaces

Country Status (2)

Country Link
DE (1) DE202008009288U1 (en)
WO (1) WO2009010076A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210212722A1 (en) * 2020-01-10 2021-07-15 Aok Innovations, Llc Chest tube insertion device
US11963692B2 (en) 2021-04-30 2024-04-23 Aok Innovations, Llc Body cavity access device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB205105A (en) * 1922-10-06 1924-10-16 Louis Marie Clement Charnaux Improvements in bougies, catheters, sounds and the like used in medicine and surgery
US20020013597A1 (en) * 2000-05-16 2002-01-31 Mcfarlane Richard H. Penetrating tip for trocar assembly
WO2003026512A1 (en) * 2001-09-24 2003-04-03 Applied Medical Resources Corporation Bladeless obturator
WO2004032770A2 (en) * 2002-10-04 2004-04-22 Conmed Corporation Trocar system
US20050251190A1 (en) * 2000-05-16 2005-11-10 Mcfarlane Richard H Penetrating tip for trocar assembly
EP1712196A2 (en) * 2005-04-12 2006-10-18 Tyco Healthcare Group Lp Optical trocar with scope holding assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5314417A (en) 1992-12-22 1994-05-24 Ethicon, Inc. Safety trocar
CA2184958A1 (en) * 1995-09-22 1997-03-23 John S. Gentelia Improved trocar-cannulla device
DE20318220U1 (en) * 2003-02-01 2004-02-12 Fresenius Kabi Deutschland Gmbh Hollow organ puncturing in medicine, comprises using a tubular shaft with a holder at its proximal end, a distal end piece, and angled surfaces that form cutting edges

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB205105A (en) * 1922-10-06 1924-10-16 Louis Marie Clement Charnaux Improvements in bougies, catheters, sounds and the like used in medicine and surgery
US20020013597A1 (en) * 2000-05-16 2002-01-31 Mcfarlane Richard H. Penetrating tip for trocar assembly
US20050251190A1 (en) * 2000-05-16 2005-11-10 Mcfarlane Richard H Penetrating tip for trocar assembly
WO2003026512A1 (en) * 2001-09-24 2003-04-03 Applied Medical Resources Corporation Bladeless obturator
WO2004032770A2 (en) * 2002-10-04 2004-04-22 Conmed Corporation Trocar system
EP1712196A2 (en) * 2005-04-12 2006-10-18 Tyco Healthcare Group Lp Optical trocar with scope holding assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210212722A1 (en) * 2020-01-10 2021-07-15 Aok Innovations, Llc Chest tube insertion device
US11963692B2 (en) 2021-04-30 2024-04-23 Aok Innovations, Llc Body cavity access device

Also Published As

Publication number Publication date
WO2009010076A8 (en) 2009-03-26
DE202008009288U1 (en) 2009-01-02

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