Stent delivery system having retention structure

Patent metadata

Field	Value
Publication number	US-12318317-B2
Application number	US-202418746471-A
Country	US
Kind code	B2
Filing date	Jun 18, 2024
Priority date	Jun 21, 2010
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A stent delivery system including an elongate shaft of a medical device, a stent selectively coupled to a distal portion of the elongate shaft, and a coupling mechanism for selectively coupling the stent to the elongate shaft by inserting a tab on one of the stent or the elongate shaft into an opening in the other of the stent or the elongate shaft. The tab may be deflected from a first position to a second position to disengage the tab from the opening.

First claim

What is claimed is:

1. A drainage stent delivery system comprising:
a drainage stent including a tubular member having a proximal end, a distal end and a lumen extending therethrough, the lumen having a lumen surface;
an elongate shaft, a distal portion of the elongate shaft including a plurality of tabs extendable into the lumen of the drainage stent, the plurality of tabs being configured to move between a first position in which the plurality of tabs are disengaged from the lumen surface of the drainage stent and a second position in which the plurality of tabs are engaged with the lumen surface of the drainage stent; and
an elongate member extending axially through the elongate shaft, the elongate member being axially movable from a first axial location to a second axial location, wherein in the second axial location the plurality of tabs are deflected into engagement with the lumen surface of the drainage stent and in the first axial location the plurality of tabs are disengaged from the lumen surface of the drainage stent to allow the drainage stent to be released from the elongate shaft.

2. The drainage stent delivery system of claim 1 , wherein the plurality of tabs are biased toward the first position.

3. The drainage stent delivery system of claim 1 , wherein the plurality of tabs are frictionally engaged with the lumen surface of the drainage stent when the elongate member is at the second axial location.

4. The drainage stent delivery system of claim 1 , wherein the plurality of tabs are radially arranged.

5. The drainage stent delivery system of claim 1 , wherein the plurality of tabs are symmetrically arranged.

6. The drainage stent delivery system of claim 1 , wherein the plurality of tabs are asymmetrically arranged.

7. The drainage stent delivery system of claim 1 , wherein the plurality of tabs extend distally from a distal end of a tubular wall of the elongate shaft.

8. The drainage stent delivery system of claim 1 , wherein the plurality of tabs extend distally when in both the first position and the second position.

9. The drainage stent delivery system of claim 1 , wherein in the first position, distal ends of the tabs taper in a distal direction toward a central longitudinal axis of the elongate shaft, thereby forming a distally tapered tip on the elongate shaft.

10. The drainage stent delivery system of claim 9 , wherein the distal ends of the plurality of tabs move toward the central longitudinal axis when the elongate member is moved from the second location to the first position and wherein the distal ends of the plurality of tabs move away from the central longitudinal axis when the elongate member is moved from the first position to the second position.

11. A method of selectively decoupling a drainage stent from an elongate shaft of a medical device, the method comprising:
providing a drainage stent delivery system comprising: a drainage stent including a tubular member having a proximal end, a distal end, and a lumen extending therethrough, the lumen having a lumen surface; an elongate shaft, a distal portion of the elongate shaft including a plurality of tabs extendable into the lumen of the drainage stent, the plurality of tabs being configured to move between a first position in which the plurality of tabs are disengaged from the lumen surface of the drainage stent and a second position in which the plurality of tabs are engaged with the lumen surface of the drainage stent; and an elongate member extending axially through the elongate shaft, the elongate member being axially movable from a first axial location to a second axial location, wherein in the second axial location the plurality of tabs are deflected into engagement with the lumen surface of the drainage stent and in the first axial location the plurality of tabs are disengaged from the lumen surface of the drainage stent to allow the drainage stent to be released from the elongate shaft;
moving the elongate member from the second axial location, in which the plurality of tabs are deflected into engagement with the drainage stent, to the first axial location, in which the plurality of tabs become disengaged from the drainage stent, such that the drainage stent is released from the elongate shaft;
withdrawing the elongate shaft from the stent while the elongate member is in the first position.

12. The method of claim 11 , wherein the tab becomes disengaged from the drainage stent when in an equilibrium position and wherein the tab is deflected into engagement with the drainage stent by applying a force to the plurality of tabs such that the plurality of tabs are moved away from a central longitudinal axis of the elongate shaft and into engagement with the drainage stent.

13. The method of claim 11 , wherein the plurality of tabs are biased toward the first position.

14. The method of claim 11 , wherein the plurality of tabs are frictionally engaged with the lumen surface of the drainage stent when the elongate member is at the second axial location.

15. The method of claim 11 , wherein the plurality of tabs are radially arranged.

16. The method of claim 11 , wherein the plurality of tabs are symmetrically arranged.

17. The method of claim 11 , wherein the plurality of tabs extend distally from a distal end of a tubular wall of the elongate shaft.

18. The method of claim 11 , wherein the plurality of tabs extend distally when in both the first position and the second position.

19. The method of claim 11 , wherein in the first position, distal ends of the tabs taper in a distal direction toward a central longitudinal axis of the elongate shaft, thereby forming a distally tapered tip on the elongate shaft.

20. The method of claim 19 , wherein the distal ends of the plurality of tabs move toward the central longitudinal axis when the elongate member is moved from the second location to the first position and wherein the distal ends of the plurality of tabs move away from the central longitudinal axis when the elongate member is moved from the first position to the second position.

Assignees

• Boston Scient Scimed Inc

Inventors

• Amos Michael D
• Lane John
• Graham Jacob A
• Leanna Gary J
• Hollett Andrew K
• Weisman Michal

Classifications

• A61F2220/0033

  made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit · CPC title

• A61F2002/9505

  having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument · 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

• A61M25/01

  Introducing, guiding, advancing, emplacing or holding catheters (A61M25/10 takes precedence) · CPC title

• A61F2/9522

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