HELICAL AND SEGMENTED STENT-GRAFT

• US 20110009951A1
• Filed: 06/20/2008
• Published: 01/13/2011
• Est. Priority Date: 06/22/2007
• Status: Active Grant

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Bogert, David L.
• Granted Patent: US 10,154,917 B2
• Time in Patent Office: Days
• US Class Current: 623/1.22
• CPC Class Codes: A61F 2/07 Stent-grafts
• 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 2/89 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 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2220/005 using adhesives
• 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 2250/0036 differing in thickness
• CPC Class Codes: A61F 2250/0063 Nested prosthetic parts

Abstract

The stent-graft described herein generally includes a substrate, a helix disposed about the substrate, a covering disposed over at least a portion of the helix, and a support member coupled to the covering.

Claims

1. An implantable prosthesis, comprising:

a generally tubular substrate;

a helix disposed about an outer surface of the substrate along a longitudinal axis, the helix having a first thickness;

a covering disposed over at least a portion of the helix; and

a support member coupled to an outer surface of the covering, the support member having a second thickness greater than the first thickness.

2. The implantable prosthesis according to claim 1, wherein the helix comprises a continuous member helically disposed along a longitudinal axis from a first end to a second end to define a plurality of spaced apart helical windings.

7. The implantable prosthesis according to claim 2, wherein the space between helical windings at the first and second end is different from the space between helical windings along a mid-region of the substrate.

12. The implantable prosthesis according to claim 1, wherein the substrate and covering comprise ePTFE.

13. The implantable prosthesis according to claim 12, wherein the covering is an elongate strip of material arranged helically over the helix.

14. The implantable prosthesis according to claim 13, wherein the helix is disposed about the substrate at a first angle with respect to the longitudinal axis and the elongate strip of material is disposed about the helix at a second angle with respect to the longitudinal axis different from the first angle.

15. The implantable prosthesis according to claim 12, wherein the covering comprises a plurality of annular rings spaced apart along the longitudinal axis.

16. The implantable prosthesis according to claim 15, further comprising at least one elongate strip of ePTFE material arranged generally parallel to the longitudinal axis.

20. The implantable prosthesis according to claim 1, wherein the covering comprises ultra high molecular weight polyethylene fibers woven or knitted into a network of cells and links.

21. The implantable prosthesis according to claim 20, wherein the cells include a central opening defining a geometric shape.

22. The implantable prosthesis according to claim 20, wherein the cells are arranged along the longitudinal axis in a first row and a second row spaced circumferentially approximately 180 degrees from the first row.

23. The implantable prosthesis according to claim 22, wherein adjacent cells along the first row are connected by a longitudinal link and adjacent cells along the second row are connected by a longitudinal link.

24. The implantable prosthesis according to claim 23, wherein first row cells are connected to second row cells at approximately the same axial position along the longitudinal axis by a first circumferential link and a second circumferential link spaced approximately 180 degrees from the first circumferential link.

25. The implantable prosthesis according to claim 24, wherein the circumferential links are rotated approximately 90 degrees with respect to the longitudinal links.

28. The implantable prosthesis according to claim 1, further comprising a polymeric adhesive disposed over at least a portion of the helix and a tetrahydrofuran (THF) solvent disposed over at least a portion of the covering.

36. The implantable prosthesis according to claim 1, wherein the first thickness in the range of about 50 microns to about 1000 microns, and wherein the second thickness is in the range of about 0.5 mm to about 2.0 mm.

39. The implantable prosthesis according to claim 1, wherein the support member is disposed substantially coincident with the covering outer surface.

40. The implantable prosthesis according to claim 1, wherein the support member includes a plurality of circumferential sections spaced apart along the longitudinal axis.

3-6. -6. (canceled)

8-11. -11. (canceled)

17-19. -19. (canceled)

26-27. -27. (canceled)

29-35. -35. (canceled)

37-38. -38. (canceled)

41-45. -45. (canceled)

46. A stent-graft, comprising:

a helix disposed about a substrate, the material of the helix having a first stiffness;

a covering disposed over at least a portion of the helix; and

a support member coupled to the covering, the support member material having a second stiffness greater than the first stiffness.

47. (canceled)

48. A stein-graft, comprising:

a self-expanding helix disposed about an ePTFE substrate;

a covering disposed over at least a portion of the helix; and

a plurality of spaced apart expandable segments coupled to the covering.

49. (canceled)