Helical and segmented stent-graft

Patent metadata

Field	Value
Publication number	US-10154917-B2
Application number	US-66615808-A
Country	US
Kind code	B2
Filing date	Jun 20, 2008
Priority date	Jun 22, 2007
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

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.

First claim

What is claimed is:

1. An implantable prosthesis, comprising:
a generally tubular substrate;
a helix disposed over an outer surface of the substrate along a longitudinal axis, the helix having a first thickness;
a covering separate from the tubular substrate 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 and overlapping at least a portion of the helix.

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 apparat helical windings that are not interconnected.

3. The implantable prosthesis according to claim 2 , wherein a space between helical windings at the first end and the second end is different from a space between helical windings along a mid-region of the generally tubular substrate when the implantable prosthesis is in a relaxed condition.

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

5. The implantable prosthesis according to claim 4 , wherein the covering is an elongate strip of material arranged helically over the helix.

6. The implantable prosthesis according to claim 5 , wherein the helix is disposed about the generally tubular 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.

7. The implantable prosthesis according to claim 4 , wherein the covering comprises a plurality of annular rings, which are not interconnected, spaced apart along the longitudinal axis.

8. The implantable prosthesis according to claim 7 , further comprising at least one elongate strip of ePTFE material arranged generally parallel to the longitudinal axis.

9. 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.

10. The implantable prosthesis according to claim 9 , wherein the network of cells and links includes a central opening defining a hexagonal shape.

11. The implantable prosthesis according to claim 9 , wherein the network of cells are arranged along the longitudinal axis in a first row and a second row spaced circumferentially approximately 180 degrees from the first row.

12. The implantable prosthesis according to claim 11 , 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.

13. The implantable prosthesis according to claim 12 , wherein the first row cells are connected to the 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.

14. The implantable prosthesis according to claim 13 , wherein the first and second circumferential links are rotated approximately 90 degrees with respect to the longitudinal links.

15. 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.

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

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

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

19. A stent-graft, comprising:
a helix disposed over an outer surface of a substrate, a material of the helix having a first stiffness;
a covering separate from the substrate and disposed over at least a portion of the helix; and
a support member coupled to the covering, a material of the support member having a second stiffness greater than the first stiffness and overlapping at least a portion of the helix.

20. A stent-graft, comprising:
a self-expanding helix disposed over an outer surface of an ePTFE substrate;
a covering separate from the ePTFE substrate and disposed over at least a portion of the helix; and
a plurality of spaced apart expandable segments coupled to the covering and overlapping at least a portion of the helix.

Assignees

• Bogert David L
• Bard Inc C R

Inventors

• Bogert David L

Classifications

• A61F2210/0076

  multilayered, e.g. laminated structures · CPC title

• A61F2/89

  the wire-like elements comprising two or more adjacent rings flexibly connected by separate members · CPC title

• A61F2220/0075

  sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable · CPC title

• A61F2220/005

  using adhesives · CPC title

• A61F2250/0036

  differing in thickness · CPC title