Luminal stenting

Patent metadata

Field	Value
Publication number	US-9308110-B2
Application number	US-201514875737-A
Country	US
Kind code	B2
Filing date	Oct 6, 2015
Priority date	Feb 23, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A stent delivery system, a core assembly, and methods of operating the same are provided. The delivery system can comprise a catheter and the core assembly. The core assembly can comprise a constraining member, protruding member, a core member, and a stent extending along the core member. The tubular constraining member can be spaced apart from the core member and define a capture area. The protruding member can be disposed along the core member at least partially distal of the capture area. The stent can have a first portion disposed within the capture area and a second portion, distal to the first portion, extending across or over an outer surface of the protruding member so that the protruding member and the constraining member cooperate to inhibit expansion of the first portion of the stent.

First claim

What is claimed is:

1. A method of operating a stent delivery system within a vessel of a patient, comprising:
positioning a catheter in the vessel, the catheter having a lumen defining an axis extending between a proximal end and a distal end, such that the catheter distal end is at a treatment site;
positioning a core assembly within the catheter lumen, the core assembly having (i) an elongate member comprising a distal section, (ii) a stent having a distal portion and being carried along the elongate member, and (iii) a distal cover coupled to the member distal section and extending proximally, the core assembly being positioned within the lumen such that the elongate member distal section is positioned axially adjacent the catheter distal end with at least a portion of the distal cover extending in a space within the lumen radially between the elongate member distal section and the catheter distal end;
moving the catheter relative to the core assembly to permit expansion of the stent distal portion, the expansion urging the distal cover away from the elongate member; and
recapturing the core assembly into the catheter by moving the core assembly relative to the catheter such that the elongate member distal section is positioned axially adjacent to the catheter distal end with the distal cover positioned out of the space and extending distally.

2. The method of claim 1 , wherein the moving comprising maintaining the core assembly stationary within the vessel while proximally retracting the catheter.

3. The method of claim 1 , wherein the recapturing comprises maintaining the catheter stationary within the vessel while proximally withdrawing the core assembly into the catheter.

4. The method of claim 1 , wherein during the recapturing, the distal cover is positioned out of the space to provide a clearance between the elongate member and the catheter.

5. The method of claim 1 , further comprising releasing the stent at the treatment site within the vessel.

6. The method of claim 5 , further comprising proximally withdrawing the core assembly from the lumen while maintaining the catheter distal end in place at the treatment site.

7. The method of claim 6 , further comprising inserting a second core assembly into the lumen, the second core assembly being configured to deliver a second stent at the treatment site.

8. The method of claim 1 , wherein the recapturing comprises everting a free first end of the distal cover from a proximally oriented position to a distally oriented position.

9. The method of claim 8 , wherein the distal cover is coupled to the core assembly at a distal cover second end, the first end being positioned distally relative to the second end when the distal cover is everted.

10. The method of claim 1 , wherein the moving comprises frictionally engaging a proximal end of the stent.

11. A method of operating a stent delivery system within a blood vessel of a patient, comprising:
positioning a catheter in the vessel, the catheter having a lumen extending between a proximal end and a distal end, such that the catheter distal end is at a treatment site;
advancing a core assembly distally within the catheter, the core assembly having (i) a distal section, (ii) a distal cover extending from the distal section, and (iii) a stent having a distal portion and being carried by the core assembly, the core assembly being advanced within the catheter such that the distal cover extends proximally from the distal section;
moving the catheter relative to the core assembly to permit expansion of the stent distal portion, the expansion urging the distal cover radially away from the core assembly; and
recapturing the core assembly into the catheter by moving the core assembly relative to the catheter such that the distal cover extends distally through an annular space between the distal section and the catheter.

12. The method of claim 11 , wherein the moving comprising maintaining the core assembly stationary within the vessel while proximally retracting the catheter.

13. The method of claim 11 , wherein the recapturing comprises maintaining the catheter stationary within the vessel while proximally withdrawing the core assembly into the catheter.

14. The method of claim 11 , wherein during the recapturing, the distal cover extends distally through the annular space to provide a clearance between the catheter and an intermediate portion of the core assembly proximal to the distal cover.

15. The method of claim 11 , wherein the recapturing comprises everting a free first end of the distal cover from a proximally oriented position to a distally oriented position.

16. The method of claim 15 , wherein the distal cover is coupled to the core assembly at a distal cover second end, the first end being positioned distally relative to the second end when the distal cover is everted.

17. The method of claim 11 , wherein the moving comprises frictionally engaging a proximal end of the stent.

18. A method of operating a stent delivery system within a vessel of a patient, comprising:
positioning a catheter in the vessel, the catheter having a lumen defining an axis extending between a proximal end and a distal end, such that the catheter distal end is at a treatment site;
positioning a core assembly within the catheter lumen, the core assembly having (i) an elongate member comprising a distal section, (ii) a self-expanding stent having a distal portion and being carried by the elongate member, and (iii) a distal cover having first and second ends, the first end coupled to the member distal section, the second end extending proximally from the member distal section to be radially interposed between the catheter and the stent distal portion without exerting a substantial radial constraining force on the stent; and
moving the catheter relative to the core assembly to permit expansion of the stent distal portion thereby causing the second end of the distal cover to move radially without substantially constricting stent expansion and permitting movement of the second end distally beyond the first end.

19. The method of claim 18 , wherein the moving comprising maintaining the core assembly stationary within the vessel while proximally retracting the catheter.

20. The method of claim 18 , wherein the moving comprises permitting the stent to self-expand such that an expansive force of the stent moves the distal cover absent another expansive force.

21. The method of claim 18 , wherein the moving comprises rotating the elongate member relative to the stent.

22. The method of claim 18 , wherein the distal cover comprises an elongate flexible material, the method further comprising recapturing the core assembly into the catheter by moving the core assembly relative to the catheter to evert the distal cover, such that the second end moves from a first configuration, in which the second end is located proximally relative to the first end, to a second configuration, in which the second end is located distally relative to the first end.

23. The method of claim 22 , wherein the recapturing comprises maintaining the catheter stationary within the vessel while proximally withdrawing the core assembly into the catheter.

24. The method of claim 18 , wherein the moving comprises frictionally engaging a proximal end of the stent.

Assignees

• Covidien Lp

Inventors

• Newell Gabriel
• Huynh Andy
• Farhat Lawrence

Classifications

• A61F2/9522

  Means for mounting a stent or stent-graft onto or into a placement instrument · CPC title

• A61F2/844

  folded prior to deployment · CPC title

• A61F2/82

  Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents (stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07) · CPC title

• A61F2/95

  Instruments specially adapted for placement or removal of stents or stent-grafts · CPC title

• A61F2002/9665

  with additional retaining means · CPC title