Expandable and retrievable stent

• US 20060259119A1
• Filed: 05/01/2006
• Published: 11/16/2006
• Est. Priority Date: 05/04/2005
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Wilson-Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Rucker, Brian K.
• Granted Patent: US 7,727,270 B2
• Time in Patent Office: Days
• US Class Current: 623/1.110
• CPC Class Codes: A61F 2/82 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; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/844 folded prior to deployment
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/825 having longitudinal struts
• CPC Class Codes: A61F 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2230/006 Y-shaped

Abstract

An expandable and retrievable stent is disclosed herein. The stent includes an inner strut, a first traveling anchor movably attached to the inner strut and a second anchor secured to the inner strut. The stent further includes frame connected to the first traveling anchor and the second anchor wherein the frame has at least a radially compressed configuration and a radially expanded configuration. The stent may also include a generally cylindrical sleeve.

Claims

1. An expandable and retrievable stent comprising:

an inner strut with an inner strut proximal end portion and an inner strut distal end portion;

a distal anchor secured to the inner strut distal end portion;

a plurality of distal arms operably attached to the distal anchor;

a first traveling anchor movably attached to the inner strut, wherein the first traveling anchor is located between the inner strut proximal end portion and the inner strut distal end portion;

a plurality of proximal arms operably attached to the traveling anchor; and

a plurality of outer struts, wherein each outer strut extends between and is operably attached to one proximal arm at a proximal attachment and one distal arm at a distal attachment.

2. The expandable and retrievable stent of claim 1, further comprising:

a second traveling anchor, wherein the second traveling anchor is distal to the first traveling anchor and proximal to the distal anchor; and

a plurality of central arms operably attached to the second traveling anchor, wherein each central arm is operably attached to one of the outer struts.

3. The expandable and retrievable stent of claim 1, having three configurations, namely:

a first compressed state, wherein the distal arms are pivoted distally away from the distal anchor, the proximal arms are pivoted distally away from the traveling anchor and the traveling anchor is in a first position;

an expanded state, wherein the distal arms and the proximal arms are substantially perpendicular to the inner strut and the traveling anchor is in a second position; and

a second compressed state, wherein the distal arms are pivoted proximally away from the distal anchor, the proximal arms are pivoted proximally away from the traveling anchor and the traveling anchor is in a third position;

wherein the second position is between the first position and the third position.

4. The expandable and retrievable stent of claim 1, further comprising a cylindrical sleeve, wherein the cylindrical sleeve is attached to the plurality of outer struts.

5. The expandable and retrievable stent of claim 4, wherein the cylindrical sleeve includes at least one biologically active compound.

6. The expandable and retrievable stent of claim 1 wherein the proximal arms and the distal arms are attached to the first traveling anchor, the distal anchor and the outer struts by way of eyelets.

7. The expandable and retrievable stent of claim 1, wherein a surface of the inner strut comprises sloping teeth and the first traveling anchor comprises a pawl.

8. The expandable and retrievable stent of claim 1 wherein the outer struts are convex.

9. The expandable and retrievable stent of claim 1, wherein the traveling anchor is convertible from a reduced diameter to an expanded diameter.

10. The expandable and retrievable stent of claim 1, wherein the surface of the inner strut comprises spiral threads and the traveling anchor comprises grooves corresponding to the spiral threads.

11. The expandable and retrievable stent of claim 1, wherein the stent comprises a bioabsorbable material.

12. The expandable and retrievable scent of claim 1, wherein the stent or selected portions of the stent comprise a coating.

13. The expandable and retrievable stent of claim 12, wherein the coating comprises at least one biocompatible polymeric material.

14. The expandable and retrievable stent of claim 12, wherein the coating comprises at least one biologically active material.

15. An expandable and retrievable stent comprising:

an inner strut with an inner strut proximal end portion and an inner strut distal end portion;

a distal anchor secured to the inner strut distal end portion;

a first traveling anchor movably attached to the inner strut; and

a movable member connected to the distal anchor and the first traveling anchor;

wherein the movable member has a radially compressed configuration when the traveling anchor is in a first position and a radially expanded configuration when the traveling anchor is in a second position.

16. The expandable and retrievable stent of claim 15, wherein the movable member comprises:

a plurality of distal arms operably attached to the distal anchor;

a plurality of proximal arms pivotally attached to the traveling anchor; and

a plurality of outer struts, wherein each outer strut extends between and is pivotally attached to one proximal arm at a pivoting proximal attachment and one distal arm at a pivoting distal attachment.

17. The expandable and retrievable stent of claim 16 wherein the movable member is generally cylindrically shaped.

18. An expandable and retrievable stent comprising:

an inner strut;

a first traveling anchor movably attached to the inner strut;

a second anchor secured to the inner strut; and

a frame connected to the first traveling anchor and the second anchor;

the frame having at least a radially compressed configuration and a radially expanded configuration.

19. The expandable and retrievable stent of claim 18 wherein the frame is generally cylindrically shaped.

20. The expandable and retrievable stent of claim 18 wherein the frame includes a plurality of proximal arms connected to the traveling anchor, a plurality of distal arms connected to the second anchor, and a plurality of outer struts, each outer strut being connected to one proximal arm and one distal arm.

21. An expandable and retrievable stent comprising:

an inner strut with an inner strut proximal end portion and an inner strut distal end portion;

a distal anchor movably attached to the inner strut distal end portion;

a first traveling anchor movably attached to the inner strut, proximal to the distal anchor;

a movable member connected to the distal anchor and the first traveling anchor; and

a sleeve attached to at least a portion of the movable member;

wherein the movable member has a radially compressed configuration when the traveling anchor is in a first position and a radially expanded configuration when the traveling anchor is in a second position.