Low profile non-symmetrical stent

• US 9,180,030 B2
• Filed: 12/11/2008
• Issued: 11/10/2015
• Est. Priority Date: 12/26/2007
• Status: Active Grant

• Current Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated), William Cook Europe ApS (Cook Group Incorporated)
• Original Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Inventors: Brocker, David, Dierking, William K., Leewood, Alan R., Chuter, Timothy A. M., Roeder, Blayne A., Charlebois, Steven J., Swift, Richard A., Gopalakrishnamurthy, Sharath, Huser, Matthew S., Kratzberg, Jarin, Rasmussen, Erik E., Oehlenschlaeger, Bent, Mogelvang Jensen, Kim
• Primary Examiner(s): Sweet, Thomas J
• Assistant Examiner(s): SCHALL, MATTHEW WAYNE
• Application Number:
  US12/332,904
• Publication Number:
  US 20090171437A1
• Time in Patent Office: 2,525 Days
• Field of Search: 623/1.15
• US Class Current: 1/1
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/852 Two or more distinct overlapping stents
• 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 2002/825 having longitudinal struts
• 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 2002/91566 connected trough to trough
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped

Abstract

A stent for use in a medical procedure having opposing sets of curved apices, where the curved section of one set of apices has a radius of curvature that is greater than the curved section of the other set of apices. One or more such stents may be attached to a graft material for use in endovascular treatment of, for example, aneurysm, thoracic dissection, or other body vessel condition.

Claims

1. A stent comprising:

at least one distal apex comprising

first and second generally straight portions and

a first curved portion disposed between the first and second straight portions and comprising a first radius of curvature; and

at least one proximal apex comprising

third and fourth generally straight portions and

a second curved portion disposed between the third and fourth straight portions and comprising a second radius of curvature that is greater than the first radius of curvature, and

where at least one of the first and second generally straight portions is continuous with at least one of the third and fourth generally straight portions,

where the first radius of curvature is from about 0.5 mm to about 1.5 mm,

where the second radius of curvature is from about 4 mm to about 9 mm,

where a ratio of the first radius of curvature to the second radius of curvature is about 1;

2.6 to about 1;

18, and

where the stent comprises at least one uncovered region.

2. The stent of claim 1 comprising a generally continuous plurality of proximal and distal apices, the outer surfaces of which define a cylinder having a generally consistent circumference.

3. The stent of claim 1 where the first radius of curvature is about 1 mm, and the second radius of curvature is about 6 mm.

4. The stent of claim 1 where each of the proximal apices are circumferentially offset from the distal apices.

5. The stent of claim 1 comprising a generally continuous plurality of proximal and distal apices, the outer surfaces of which define a frustum of a cone.

6. The stent of claim 5, further comprising a graft, where at least one distal apex of the stent is attached to the graft using one or more sutures.

7. The stent of claim 1 where at least one of the proximal apices comprises first and second fillets disposed a distance from the second curved portion, the first fillet comprising a first fillet radius of curvature and the second fillet comprising a second fillet radius of curvature.

8. The stent of claim 7 where the first fillet radius of curvature and the second fillet radius of curvature each have a radius of curvature of about 1 mm, and the first curved portion has a radius of curvature of about 0.5 mm.

9. The stent of claim 7 where the ratio of the radius of curvature of the first curved portion to at least one of the first and second fillet radius of curvature is about 1:

1to about 1;

10.

10. The stent of claim 7, further comprising a graft, where at least one distal apex of the stent is attached to the graft using one or more sutures.

11. The stent of claim 1,

where the stent includes a wire having the curved and the straight portions and generally defining a cylinder;

where the first radius of curvature is about 1 mm; and

the second radius of curvature is about 6 mm.

19. The stent of claim 1 where a ratio of the first radius of curvature to the second radius of curvature is about 1:

6.

12. A stent comprising:

a plurality of proximal apices and a plurality of distal apices connected with the proximal apices by a plurality of generally straight portions;

where each proximal apex comprises a first curved portion and each distal apex comprises a second curved portion;

where the first curved portion and the second curved portion each comprises at least one radius of curvature, and the radius of curvature of at least one of the proximal apices is greater than the radius of curvature of at least one of the distal apices,

where the radius of curvature of the distal apices is from about 0.5 mm to about 1.5 mm,

where the radius of curvature of the proximal apices is from about 4 mm to about 9 mm, and

where a ratio of the radius of curvature of the distal apices to the radius of curvature of the proximal apices is about 1;

2.6 to about 1;

18, and

where the stent comprises at least one uncovered region.

13. The stent of claim 12 where an outer circumference around the proximal apices is greater than an outer circumference around the distal apices.

14. The stent of claim 12, further comprising a graft, where at least one distal apex of the stent is attached to the graft using one or more sutures.

15. The stent of claim 14, further comprising at least one branch stent, at least one branch graft, or at least one branch stent-graft, a portion of which is at least disposed transversely through an inner radius of a proximal apex.

16. The stent of claim 14, further comprising a second stent attached to the graft, where the second stent comprises plurality of proximal apices and a plurality of distal apices connected with the proximal apices by a plurality of generally straight portions;

where each proximal apex comprises a first curved portion and each distal apex comprises a second curved portion;

where the first curved portion and the second curved portion each comprises at least one radius of curvature, and the radius of curvature of at least one of the distal apices is greater than the radius of curvature of at least one of the proximal apices.

17. The stent of claim 14, further comprising a bare stent attached to and extending distally from the graft.

18. The stent of claim 17, further comprising at least one stent attached to and providing columnar support for the graft.

20. The stent of claim 12 where a ratio of the radius of curvature of the distal apices to the radius of curvature of the proximal apices is about 1:

6.