Corewire actuated delivery system with fixed distal stent-carrying extension

• US 20050209671A1
• Filed: 03/02/2004
• Published: 09/22/2005
• Est. Priority Date: 03/02/2004
• Status: Abandoned Application

• Current Assignee: Biosensors International Group, Ltd.
• Original Assignee: CardioMind, Inc. (Biosensors International Group, Ltd.)
• Inventors: Nikolchev, Julian, Ton, Dai T., Debeer, Nicholas C., George, William R.
• Application Number:
  US10/792,679
• Publication Number:
  US 20050209671A1
• Time in Patent Office: Days
• US Class Current: 623/1.110
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2230/0054 V-shaped

Abstract

Medical device and methods for delivery or implantation of prostheses within hollow body organs and vessels or other luminal anatomy are disclosed. The subject technologies may be used in the treatment of atherosclerosis in stenting procedures. For such purposes, a self-expanding stent is deployed in connection with an angioplasty procedure with a corewire actuated delivery system having a fixed distal stent-carrying extension. Withdrawal of the corewire retracts a restraint freeing the sent from a collapsed state, whereupon the stent assumes an expanded configuration set in apposition to the interior surface of a vessel lumen in order to help maintain the vessel open.

Claims

1. A stent delivery system comprising:

a self-expanding stent;

an inner wire,

an outer sleeve, the inner wire slidingly received within the sleeve,

an extension wire, a connection being provided between a distal portion of the sleeve and the extension wire;

a restraint holding the stent collapsed over the extension wire; and

a bridge segment connecting the restraint to the inner wire.

2. The system of claim 1, wherein the extension wire is fixed relative to the sleeve.

3. The system of claim 1, wherein the extension wire terminates in an atraumatic distal tip.

4. The system of claim 1, wherein a stent stop surface is provided to abut a proximal end of the stent.

5. The system of claim 4, wherein the stent stop surface is provided on the extension wire.

6. The system of claim 4, wherein a shoulder on the extension wire provides the stent stop surface.

7. The system of claim 4, wherein the stent stop surface is provided by a stopper member over the extension wire.

8. The system of claim 4, wherein the stent stop surface is provided at a distal end of the sleeve.

9. The system of claim 1, wherein the inner wire is a corewire.

10. The system of claim 1, wherein the connection between the extension wire and the sleeve is proximal to a distal end of the sleeve so that the sleeve overlays the bridge segment.

11. The system of claim 1, wherein the connection between the extension wire and the sleeve is at a distal end of the sleeve.

12. The system of claim 1, wherein one bridge segment is provided.

13. The system of claim 11, wherein the connection between the extension wire and the sleeve is offset from an axis along the tubular body.

14. The system of claim 1, wherein a plurality of bridge segments are provided.

15. The system of claim 14, wherein the connection between the extension wire and the sleeve is two-sided.

16. The system of claim 14, wherein the connection between the extension wire and the tubular body is three-sided.

17. The system of claim 14, wherein the connection between the extension wire and the tubular body is symmetrical about an axis along the tubular body.

18. The system of claim 1, wherein the bridge segment has a length of at least about a compressed length of the stent.

19. The system of claim 1, wherein said restraint wraps around the stent.

20. The system of claim 1, wherein the restraint comprises a tubular member.

21. The system of claim 1, wherein a proximal portion of the delivery guide consists essentially of the sleeve and the inner wire, wherein the inner wire is a core wire.

22. A method of stent delivery, the method comprising:

providing a system according to claim 1,

positioning the stent at a target site, and

withdrawing the inner member to withdraw the restraint to release the stent for deployment at the target site,

wherein the delivery system does not increase in diameter during release of the stent.

23. The method of claim 22, further comprising dilatating a balloon of a balloon catheter in an angioplasty procedure prior to the releasing of said stent.

24. The method of claim 23, further comprising dilatating the balloon within the stent after deployment.

25. The method of claim 23, wherein the delivery system is passed through a lumen of the balloon catheter to effect the positioning of said stent.

26. The method of claim 23, wherein the delivery guide further comprises an atraumatic tip and wherein the atraumatic tip does not move axially during release of the stent.