Twisted anchoring barb for stent of abdominal aortic aneurysm (AAA) device

• US 20080021544A1
• Filed: 07/18/2006
• Published: 01/24/2008
• Est. Priority Date: 07/18/2006
• Status: Active Grant

• Current Assignee: Cardinal Health Switzerland 515 GmbH (Cardinal Health, Inc.)
• Original Assignee: Cordis Corporation (Cardinal Health, Inc.)
• Inventors: Park, Jin S., Majercak, David C.
• Granted Patent: US 8,298,281 B2
• Time in Patent Office: Days
• US Class Current: 623/1.36
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/8483 Barbs
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2250/0039 differing in diameter

Abstract

A stent is provided for an endoprosthesis having a main body portion and two leg portions, particularly suitable for treatment of an abdominal aortic aneurism. The stent includes barbs that are twisted and shaped set to point radially outward. Each barb, as formed, points substantially perpendicular relative to the longitudinal axis of the stent, even when in a non-deployed configuration. The motion to move the barb into a deployed configuration for gripping tissue is a twisting motion which moves the barb from being substantially aligned with the circumference of the stent to extending radially outwards from the stent.

Claims

1. An endoluminal prosthesis device, comprising:

a) a graft that operates as a conduit for blood; and

b) a stent coupled to said graft, said stent including at least one barb, each barb including an anchor portion and a twisted neck shape set to bias said anchor portion to rotate about an axis extending in alignment through the neck portion of the barb.

2. A device according to claim 1, wherein:

said stent and barb together define three axes, an X-axis extending tangential to a circumference of said stent, a Y-axis extending radially outward from said stent, and a Z-axis extending through said neck portion of said barb, and

said neck portion is shape set biased to rotate said anchor portion about said Z-axis.

3. A device according to claim 1, wherein:

each said anchor portion, as formed, is oriented substantially perpendicular relative to the longitudinal axis of said stent.

4. A device according to claim 1, wherein:

when in a collapsed non-deployed configuration, said anchor portions of said barbs are substantially oriented about a circumference of said stent.

5. A device according to claim 1, wherein:

when in an expanded deployed configuration, said anchor portions of said barbs are oriented substantially radially relative to the longitudinal axis of said stent.

6. A device according to claim 1, wherein:

said neck rotates said anchor portions of said barbs into orientation during expansion in said deployed configuration.

7. A device according to claim 1, wherein:

said graft includes a main body and first and second leg portions coupled relative to said main body portions.

8. A device according to claim 1, wherein:

said graft is bifurcated.

9. A device according to claim 1, wherein:

said device is an abdominal aortic aneurism treatment device.

10. A device according to claim 1, wherein:

said stent is a self-expanding stent.

11. A device according to claim 1, wherein:

said stent is made of a shape memory alloy

12. A device according to claim 11, wherein:

said stent is made of a nickel-titanium alloy.

20. A device according to claim 1, wherein:

said stent is made of a shape memory alloy

13. A stent, comprising:

a plurality of struts coupled together to define a tubular stent; and

at least one barb coupled to said struts, said barb including an anchor portion and a neck portion shape set to bias said anchor portion to rotate about an axis extending in alignment through the neck portion of the barb.

14. A stent according to claim 13, wherein:

said stent and barb together defining three axes, an X-axis extending tangential to a circumference of said stent, a Y-axis extending radially outward from said stent, and a Z-axis extending through said neck portion of said barb,

wherein said neck portion is shape set biased to rotate said anchor portion about said Z-axis.

15. A stent according to claim 13, wherein:

said anchor portion, as formed, is oriented substantially perpendicular relative to said Z-axis.

16. A stent according to claim 13, wherein:

said stent is movable between a collapsed non-deployed configuration and an expanded deployed configuration, and when said stent is in said non-deployed configuration said anchor portion is substantially oriented about said circumference of said stent.

17. A stent according to claim 13, wherein:

when said stent is in said deployed configuration, said anchor portion is oriented substantially radially relative to Z-axis.

18. A stent according to claim 13, wherein:

said neck portion rotates said anchor portion of said barb into orientation during expansion into said deployed configuration.

19. A stent according to claim 13, wherein:

said stent is a self-expanding stent.

21. An endoluminal prosthesis, comprising:

a) a main body including a graft and a stent having a longitudinal axis; and

b) first and second leg portions coupled relative to said main body portions,

wherein said stent includes at least one barb for coupling the main body portion relative to an abdominal aortic wall, each said barb including an anchor portion and a neck portion shape,

said stent and barb together defining three axes, an X-axis extending tangential to a circumference of said stent, a Y-axis extending radially outward from said stent, and a Z-axis extending through said neck portion of said barb, and

said neck portion is shape set biased to rotate said anchor portion about said Z-axis.

25. A method according to claim 21, wherein:

said providing includes providing said stent coupled to a graft.

26. A method according to claim 25, wherein:

said providing includes providing said stent as a portion of a bifurcated abdominal aortic aneurism device.

27. A method according to claim 26, further comprising:

prior to deploying, locating the delivery tube at an abdominal aortic aneurism.

22. A method of delivering a stent, comprising:

a) providing a stent having a longitudinal axis, a circumference, and at least one barb having a neck portion and an anchor portion;

b) inserting the stent into a delivery tube such that the barb is located substantially aligned with the circumference of the stent; and

c) deploying the stent from the delivery tube such that the anchor portion of the barb rotates about an axis extending in alignment through the neck portion of the barb.

23. A method according to claim 22, wherein:

upon deploying, said barb is substantially perpendicular relative to a longitudinal axis of the stent.

24. A method according to claim 23, wherein:

upon inserting, said barb is substantially perpendicular relative to the longitudinal axis of the stent.