Stent holding member and stent feeding system

• US 20030033001A1
• Filed: 08/30/2002
• Published: 02/13/2003
• Est. Priority Date: 02/27/2001
• Status: Active Grant

• Current Assignee: Kyoto Medical Planning Co., Ltd. (Japan Wool Textile Company Limited)
• Original Assignee: Kyoto Medical Planning Co., Ltd. (Japan Wool Textile Company Limited)
• Inventors: Igaki, Keiji
• Granted Patent: US 8,262,687 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9583 Means for holding the stent on the balloon, e.g. using protrusions, adhesives or an outer sleeve
• CPC Class Codes: A61M 2025/1086 having a special balloon surface topography, e.g. pores, protuberances, spikes or grooves

Abstract

A stent holding member used in a stent delivery system adapted to implant a stent of a cylindrical configuration, designed to be embedded in a living body, to a desired site of implantation in a vessel of the living body. The stent holding member includes a tubular holding member formed of an elastic material. The holder has a groove in its outer peripheral portion for holding one or more supporting struts making up the stent. Each of these supporting struts is embedded at least partially in the groove to hold the stent. The groove has its opening end side expanded by expansion of the holder along the radial direction. By expansion of the opened end of the groove, the stent held in the groove is dilated and released from the holder.

Claims

1. A stent holding member used in a stent delivery system adapted to introduce a stent of a cylindrical configuration, designed to be implanted in a living body, to a desired site of implantation in a vessel thereof, comprising:

a tubular holding member formed of an elastic material;

said holder having a groove in its outer peripheral portion for holding one or more supporting struts making up said stent, each of said struts being embedded at least partially in said groove to hold the stent.

2. The stent holding member according to claim 1 wherein said groove has its opening end side expanded by expansion of said holder along the radial direction.

3. The stent holding member according to claim 1 wherein said stent is held on an outer peripheral portion of said holder by embedding said struts in said groove.

4. The stent holding member according to claim 1 wherein said holder is formed of one or more selected from the group consisting of elastic synthetic resins, natural resins and silicone resins.

5. The stent holding member according to claim 1 wherein said holder is formed of silicone resins exhibiting tackiness.

6. The stent holding member according to claim 1 wherein said holder is formed by layering two or more tubular members having different values of modulus of elasticity.

7. The stent holding member according to claim 6 wherein the outer tubular member of said holder is formed of a silicone resin.

8. The stent holding member according to claim 1 wherein said stent is a self-expandable stent contracted under an external pressure and dilated on releasing said external pressure.

9. The stent holding member according to claim 1 wherein said stent is of a balloon expandable type.

10. The stent holding member according to claim 1 wherein the strut constituting said stent is a fiber of a biodegradable polymer and wherein said fiber is formed as a tubular member.

11. The stent holding member according to claim 1 wherein an anti-thrombotic agent is deposited on the surface of said holder.

12. The stent holding member according to claim 1 wherein said stent is retained by said holder and can be mounted on an optional balloon catheter.

13. A stent delivery system adapted to introduce a stent of a cylindrical configuration designed to be implanted in a living body, to a desired site of implantation in a vessel thereof, comprising:

a catheter inserted into a vessel of a living body;

a balloon provided to the distal end of saids catheter and expamded by a fluid supplied into the inside of said catheter; and

a stent holding member provided to said catheter for covering said balloon;

said holder having a groove in its outer peripheral portion for holding one or more supporting struts making up said stent, each of said struts being embedded at least partially in said groove to hold the stent.

14. The stent delivery system according to claim 13 wherein said stent retained by said stent holding member is released from said stent holding member and dilated by expansion of said holder along the radial direction brought about by expansion of said balloon.

15. The stent delivery system according to claim 14 wherein said groove provided in said holder has its open end expanded by expansion of said holder along the radial direction.

16. The stent delivery system according to claim 13 wherein said stent is a self-expandable stent contracted under an external pressure and dilated on releasing the external pressure.

17. The stent delivery system according to claim 13 wherein said stent is of a balloon expandable type.

18. The stent delivery system according to claim 13 wherein said stent is held by the outer periphery of said holder by embedding said struts in said groove.

19. The stent delivery system according to claim 13 wherein said holder is formed of one or more selected from the group consisting of elastic synthetic resins, natural resins and silicone resins.

20. The stent delivery system according to claim 13 wherein said holder is formed of a silicone resin exhibiting tackiness.

21. The stent delivery system according to claim 14 wherein said holder is formed by layering two or more tubular members having different values of modulus of elasticity.

22. The stent delivery system according to claim 21 wherein the outer tubular member of said holder is formed of a silicone resin.

23. The stent delivery system according to claim 13 wherein the strut constituting said stent is a fiber of a biodegradable polymer and wherein said fiber is formed as a tubular member.

24. The stent delivery system according to claim 13 wherein said stent holding member is mounted to said catheter, covering said baloon by having both ends bonded to said catheter.

25. The stent delivery system according to claim 13 wherein an anti-thrombotic agent is deposited on the surface of said holder.