Sheath for gastrostoma, sheathed dilator, sheath for gastrostoma with insertion aid, gastrostomy catheter kit, and method of splitting sheath for gastrostoma

Patent metadata

Field	Value
Publication number	US-9919135-B2
Application number	US-201514617450-A
Country	US
Kind code	B2
Filing date	Feb 9, 2015
Priority date	Nov 30, 2007
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

The present invention provides a sheath for gastrostoma ( 1 ), a sheathed dilator, a gastrostomy catheter kit and a method of splitting a sheath for gastrostoma. The sheath for gastrostoma ( 1 ) includes a sheath body ( 11 ) in which a gastrostomy catheter ( 2 ) is inserted and a handle ( 12 ). The sheath for gastrostoma ( 1 ) lowers the insertion resistance of a gastrostomy catheter when inserted in a fistula before insertion of the gastrostomy catheter in the fistula for replacement in the patient's body. According to the invention, a sheath for gastrostoma, a sheathed dilator, a sheath for gastrostoma with insertion aid, a gastrostomy catheter kit and a method of splitting a sheath for gastrostoma which can lower the insertion resistance during placement of a catheter in the patient's body, facilitate air supply control of an endoscope and stabilize endoscopic visual field during surgery are provided.

First claim

The invention claimed is:

1. A sheath for gastrostoma, comprising:
a cylindrical sheath body having a through-hole forming an inner path and configured to receive a gastrostomy catheter in the inner path;
a handle protruding from one longitudinal end of the cylindrical sheath body and connected pivotably to the longitudinal end via a hinge section of the cylindrical sheath body; and
a lid connected to the handle via a lid hinge section of the cylindrical sheath body and configured to open and close the inner path in the cylindrical sheath body through pivotation about the lid hinge section,
wherein the lid is configured to close the inner path when the lid is in a closed position and has a distal end abut against a lid abutting section of the cylindrical sheath body, and open the inner path by pivotation from the closed position in an open direction toward a distal end of the cylindrical sheath body opposite to the longitudinal end, the handle has a stopper projection piece protruding from the handle and positioned along an inner surface of the cylindrical sheath body opposite to the lid abutting section across the inner path, and the stopper projection piece is configured such that when the lid receives a force that causes the lid to pivot from the closed position in the open direction, the stopper projection piece is pressed against the inner surface of the cylindrical sheath body such that pivotation of the stopper projection piece with respect to the cylindrical sheath body is restricted.

2. The sheath for gastrostoma according to claim 1 , wherein the lid has a proximal end connected to the handle via the lid hinge section, and the hinge section and the lid hinge section are on an opposite side of the lid abutting section across the inner path.

3. The sheath for gastrostoma according to claim 1 , wherein the stopper projection piece comprises a material with rubber elasticity.

4. The sheath for gastrostoma according to claim 1 , wherein the lid hinge section comprises a material with rubber elasticity and forms a lid elastic support member configured to elastically support the lid at the closed position.

5. The sheath for gastrostoma according to claim 1 , wherein the lid hinge section and the lid comprise a material with rubber elasticity.

6. The sheath for gastrostoma according to claim 1 , wherein the handle has a mounting section which forms a part of the handle, and the mounting section, the lid hinge section and the lid comprise a synthetic resin.

7. The sheath for gastrostoma according to claim 1 , wherein the handle has a handle main piece which forms a part or all of the handle, and the handle main piece, the cylindrical sheath body and the hinge section are formed integrally as one component comprising a synthetic resin.

8. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body has at least one notch section that facilitates vertical splitting of the cylindrical sheath body in a longitudinal direction.

9. The sheath for gastrostoma according to claim 8 , wherein the notch section is a notched groove formed in the cylindrical sheath body such that the notched groove does not penetrate the cylindrical sheath body in a radial direction of the cylindrical sheath body and leaves at least one uncut portion between an inside of the cylindrical sheath body and a bottom of the notched groove.

10. The sheath for gastrostoma according to claim 9 , wherein the sheath body includes a V-shaped distal notch section forming a recess from an end surface on the longitudinal end of the cylindrical sheath body, and the notched groove extends toward the distal end of the cylindrical sheath body from a depth section of the V-shaped distal notch section.

11. The sheath for gastrostoma according to claim 9 , wherein the at least one uncut portion is fracturable by applying a load to the inner surface of the cylindrical sheath body in a range of from 0.5N to 5N.

12. The sheath for gastrostoma according to claim 8 , wherein the notch section is a slit extending along a longitudinal direction of the cylindrical sheath body and having a length shorter than an entire length of the cylindrical sheath body in the longitudinal direction, and the cylindrical sheath body has an uncut portion where no slit is formed along a virtual line extended from the slit.

13. The sheath for gastrostoma according to claim 8 , wherein the notch section is formed in a wedge-shaped cross-section having an opening width that increases from the inner surface toward an outer surface of the cylindrical sheath body.

14. The sheath for gastrostoma according to claim 8 , wherein the handle is located at a position where the handle does not interfere with the notch section in a circumferential direction of the cylindrical sheath body.

15. The sheath for gastrostoma according to claim 14 , wherein the notch section is formed only at one position along the circumferential direction of the cylindrical sheath body, and the cylindrical sheath body has only one handle.

16. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body has an end surface on the longitudinal end, and the end surface is inclined with respect to an axial center of the cylindrical sheath body.

17. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body comprises a fluororesin.

18. The sheath for gastrostoma according to claim 17 , wherein the fluororesin comprises at least one of PTFE, ETFE and FEP.

19. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body is configured such that the cylindrical sheath body is detachably placeable outside of a dilator configured to form a fistula.

20. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body has an inner diameter smaller than a maximum outer diameter of an indwelling section of the gastrostomy catheter when the indwelling section is in a reduced-diameter state under an extending force applied by an obturator.

21. The sheath for gastrostoma according to claim 20 , wherein the cylindrical sheath body is vertically splittable when the gastrostomy catheter is inserted with the indwelling section in the reduced-diameter state.

22. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body comprises a stretch-deformable material such that the cylindrical sheath body is radially expandable.

23. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body has an inner diameter larger than a maximum outer diameter of an indwelling section of the gastrostomy catheter when the indwelling section is in a reduced-diameter state under an extending force applied by an obturator.

24. The sheath for gastrostoma according to claim 1 , wherein the cylindrical sheath body is configured such that a sheath insertion aid having a rod-shaped appearance is receivable in the sheath body, and the sheath insertion aid includes a rod-shaped body and a tapered distal section having a tapering structure protruding from one longitudinal end of the rod-shaped body.

25. The sheath for gastrostoma according to claim 24 , wherein the sheath insertion aid has a guidewire insertion hole which penetrates the sheath insertion aid along a longitudinal direction of the sheath insertion aid.

26. The sheath for gastrostoma according to claim 24 , wherein the sheath insertion aid is

Assignees

• Sumitomo Bakelite Co
• Suzuki Yutaka

Inventors

• Suzuki Yutaka
• Matsunami Hideaki
• Sakaguchi Yukihiko
• Ikeda Masao
• Nakayama Tomokazu
• Kamada Keiji
• Tanaka Ryo

Classifications

• A61J15/0038

  expandable, e.g. umbrella type · CPC title

• A61J15/0023

  inserted by using a sheath · CPC title

• A61J15/0026

  Parts, details or accessories for feeding-tubes (external tubes from medical containers to a connector outside of the body A61M39/08) · CPC title

• A61B17/3415

  for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters (A61B17/3417 takes precedence; body piercing catheter guide needles A61M25/06) · CPC title

• A61M25/0668 Primary

  splittable, tear apart · CPC title