Low profile non-symmetrical stents and stent-grafts

• US 8,728,145 B2
• Filed: 12/22/2011
• Issued: 05/20/2014
• Est. Priority Date: 12/11/2008
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Chuter, Timothy A. M., Roeder, Blayne A.
• Primary Examiner(s): Iwamaye, Andrew
• Assistant Examiner(s): Coburn, Leslie
• Application Number:
  US13/335,142
• Publication Number:
  US 20120130479A1
• Time in Patent Office: 880 Days
• Field of Search: 623/1.31, 623/1.35, 623/1.26, 623/2.2, 623/2.14, 623 217- 218, 623/900
• US Class Current: 623/1.13
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• 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 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0067 conical

Abstract

Various stents and stent-graft systems for treatment of medical conditions are disclosed. In one embodiment, an exemplary stent-graft comprises first and second stents, which each may comprise a series of distal apices disposed distal to a proximal end of the graft, and a series of proximal apices disposed proximally beyond the proximal end of the graft. In one example, the first stent comprises a first uniform segment, and the second stent comprises a second uniform wire segment, where the first uniform segment comprises portions disposed both internal and external to the second uniform wire segment.

Claims

1. A stent-graft for use in a medical procedure, the stent-graft comprising:

a graft having proximal and distal ends and a lumen extending therebetween;

a first stent comprising a plurality of proximal apices, a plurality of distal apices, and a plurality of intermediate portions disposed between the plurality of proximal and distal apices of the first stent, where the plurality of distal apices of the first stent comprise curved distal apices and are each disposed distal to the proximal end of the graft and overlap with the graft, and where the plurality of proximal apices of the first stent are each disposed proximally beyond the proximal end of the graft; and

a second stent comprising a plurality of proximal apices, a plurality of distal apices, and a plurality of intermediate portions disposed between the plurality of proximal and distal apices of the second stent, where the plurality of distal apices of the second stent are each disposed distal to the proximal end of the graft and overlap with the graft, and where the plurality of proximal apices of the second stent are each disposed proximally beyond the proximal end of the graft,

where the first and second stents are at least partially circumferentially out of phase.

2. The stent-graft of claim 1 where the first stent comprises a continuous segment, and the second stent comprises a continuous segment, where the continuous segment of the first stent comprises portions disposed both internal and external to the continuous segment of the second stent.

3. The stent-graft of claim 1 where each of the proximal apices of the first stent is circumferentially offset from each of the proximal apices of the second stent.

4. The stent-graft of claim 1 where each of the distal apices of the first stent is circumferentially offset from each of the distal apices of the second stent.

5. The stent-graft of claim 1 where the first stent and the second stent comprise identical geometries.

6. The stent-graft of claim 1, where at least one distal apex of the first stent comprises a first curved portion having a first radius of curvature, and at least one proximal apex of the first stent comprises a second curved portion having a second radius of curvature, where the second radius of curvature is greater than the first radius of curvature.

7. The stent-graft of claim 6 where the second radius of curvature is at least two times greater than the first radius of curvature.

8. The stent-graft of claim 6 where the first radius of curvature is from about 0.5 mm to about 1.5 mm.

9. The stent-graft of claim 6 where the second radius of curvature is from about 4 mm to about 9 mm.

10. The stent-graft of claim 6 where a ratio of the first radius of curvature to the second radius of curvature is about 1:

2.6 to about 1;

18.

11. The stent-graft of claim 6 where at least one distal apex of the second stent comprises a third curved portion having a third radius of curvature, and at least one proximal apex of the second stent comprises a fourth curved portion having a fourth radius of curvature, where the fourth radius of curvature is greater than the third radius of curvature.

12. A stent-graft for use in a medical procedure, the stent-graft comprising:

a graft having proximal and distal ends and a lumen extending therebetween;

a first stent comprising a plurality of proximal apices, a plurality of distal apices, and a plurality of intermediate portions disposed between the plurality of proximal and distal apices of the first stent, where the plurality of distal apices of the first stent are each disposed distal to the proximal end of the graft and overlap with the graft; and

a second stent comprising a plurality of proximal apices, a plurality of distal apices, and a plurality of intermediate portions disposed between the plurality of proximal and distal apices of the second stent, where the series of distal apices of the second stent are each disposed distal to the proximal end of the graft and overlap with the graft,

where the first stent comprises a continuous segment, and the second stent comprises a continuous segment, where the continuous segment of the first stent comprises portions disposed both internal and external to the continuous segment of the second stent.

13. The stent-graft of claim 12, where the series of proximal apices of the first stent are each disposed proximally beyond the proximal end of the graft, and where the series of proximal apices of the second stent are each disposed proximally beyond the proximal end of the graft.

14. The stent-graft of claim 12 where each of the proximal apices of the first stent is circumferentially offset from each of the proximal apices of the second stent.

15. The stent-graft of claim 12 where each of the distal apices of the first stent is circumferentially offset from each of the distal apices of the second stent.

16. The stent-graft of claim 12 where at least one distal apex of the first stent comprises a first curved portion having a first radius of curvature, and at least one proximal apex of the first stent comprises a second curved portion having a second radius of curvature, where the second radius of curvature is greater than the first radius of curvature.

17. A stent-graft for use in a medical procedure, the stent-graft comprising:

a graft having proximal and distal ends and a lumen extending therebetween;

a first stent comprising a plurality of proximal apices, a plurality of distal apices, and a plurality of intermediate portions disposed between the plurality of proximal and distal apices of the first stent, where at least one distal apex of the first stent comprises a curved distal apex comprising a first curved portion having a first radius of curvature, where at least one proximal apex of the first stent comprises a second curved portion having a second radius of curvature, where the second radius of curvature is greater than the first radius of curvature; and

a second stent comprising a plurality of proximal apices, a plurality of distal apices, and a plurality of intermediate portions disposed between the plurality of proximal and distal apices of the second stent, where at least one distal apex of the second stent comprises a curved distal apex comprising a third curved portion having a third radius of curvature, and at least one proximal apex of the second stent comprises a second curved portion having a fourth radius of curvature, where the fourth radius of curvature is greater than the third radius of curvature,

where the first and second stents at least partially overlap relative to one another and where the first stent comprises portions disposed both internal and external to the second stent.

18. The stent-graft of claim 17 where the first stent comprises a continuous segment, and the second stent comprises a continuous segment, where the continuous segment of the first stent comprises portions disposed both internal and external to the continuous segment of the second stent.

19. The stent-graft of claim 17, where the plurality of proximal apices of the first stent are each disposed proximally beyond the proximal end of the graft, and where the plurality of proximal apices of the second stent are each disposed proximally beyond the proximal end of the graft.

20. The stent-graft of claim 17 where each of the proximal apices of the first stent is circumferentially offset from each of the proximal apices of the second stent, and where each of the distal apices of the first stent is circumferentially offset from each of the distal apices of the second stent.