Limited expansion endoluminal prostheses and methods for their use

• US 5,843,158 A
• Filed: 02/06/1996
• Issued: 12/01/1998
• Est. Priority Date: 01/05/1996
• Status: Expired due to Fees

• Current Assignee: Medtronic Ave Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Evans, Michael A., Lenker, Jay A., Cox, Brian J., Weinberg, Steven
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): Black, John M.
• Application Number:
  US08/595,944
• Time in Patent Office: 1,029 Days
• Field of Search: 623/1, 623/11, 623/12, 606/192, 606/194, 606/195, 606/198
• US Class Current: 623/1.13
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/844 folded prior to deployment
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/072 Encapsulated stents, e.g. wire or whole stent embedded in lining
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• 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 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0078 hyperboloidal

Abstract

The present invention provides controlled expansion endoluminal prostheses and methods for their deployment and expansion. The present stent-grafts generally comprise a radially expansible tubular frame and a plastically expansible liner on the frame. Either the frame or the liner includes a reinforcing element which limits expansion of the stent-graft at a predetermined expanded size. In some embodiments, the reinforcing element restrains the frame, for example, by limiting the circumferential diagonals of perforations on a perforate frame structure. Generally, however, the reinforcing element is included in the liner as circumferentially oriented yarn. A particularly advantageous liner includes composite circumferential yarns having inexpansible fibers wrapped around an expansible fiber, such as a partially oriented yarn, PTFE, or the like.

Claims

1. A controlled expansion endoluminal prosthesis comprising:

a radially expansible tubular frame having an inner surface and an outer surface; and

a plastically expansible liner disposed on at least one of the inner and the outer surface of the frame;

wherein at least one of the frame and the liner includes at least one reinforcing element which limits radial expansion of the prosthesis to a predetermined expanded size.

8. A prosthesis as claimed in claim 1, wherein the reinforcing element comprises a fill element of the liner so that the liner defines the predetermined expanded size.

9. A prosthesis as claimed in claim 8, wherein the fill element comprises a monofilament.

10. A prosthesis as claimed in claim 8, wherein the fill element comprises a composite yarn including serpentine inexpansible fiber and a second fiber, and wherein the inexpansible fiber straightens during expansion of the liner to limit the prosthesis to the predetermined expanded size.

12. A prosthesis as claimed in claim 10, wherein the second fiber comprises a material selected from the group consisting of partially oriented yarn, monofilament, PTFE, collagen, natural wool proteins, side-chain crystallizable polymers, and hydrogels.

13. A prosthesis as claimed in claim 8, wherein the fill element comprises texturized fully drawn fiber.

14. A prosthesis as claimed in claim 8, wherein the fill element comprises annealed fully drawn fiber.

15. A prosthesis as claimed in claim 1, wherein the reinforcing element breaks when a radial expansive force exceeding a predetermined threshold force is applied, thereby allowing the prosthesis to be expanded beyond the predetermined expanded size.

2. A controlled expansion endoluminal prosthesis comprising:

a radially expansible tubular frame having an inner surface and an outer surface; and

a plastically expansible liner disposed on at least one of the inner and the outer surface of the frame;

wherein the frame includes a plurality of reinforcing elements which limit radial expansion of the prosthesis to a predetermined expanded size, the reinforcing elements restraining radial expansion of the frame so that the frame defines the predetermined size.

3. A prosthesis as claimed in claim 2, wherein the reinforcing elements releasably restrain resilient expansion of the frame at the predetermined size, the frame comprising a self-expanding structure.

4. A prosthesis as claimed in claim 2, wherein the reinforcing elements limit plastic expansion of the frame at the predetermined size, the frame comprising a plastically expansible structure.

5. A prosthesis as claimed in claim 2, wherein the frame comprises a perforate tubular structure, and wherein the reinforcing elements limit individual perforation dimensions.

6. A prosthesis as claimed in claim 2, wherein each reinforcing element comprises a circumferential frame belt.

7. A prosthesis as claimed in claim 6, wherein the frame belts attach the frame to the liner.

11. A controlled expansion endoluminal prosthesis comprising:

a radially expansible tubular frame having an inner surface and an outer surface; and

a plastically expansible liner disposed on at least one of the inner surface and the outer surface of the frame;

wherein the liner includes at least one reinforcing fill element which limits radial expansion of the prosthesis so that the liner defines a predetermined expanded prosthesis size; and

wherein the fill element comprises a composite yarn including serpentine inexpansible fiber and a second expansible fiber, wherein the serpentine fiber comprises fully drawn fiber wrapped around the second fiber, and wherein the serpentine fiber straightens during expansion of the liner to the predetermined expanded size.

16. An expansible liner stent-graft comprising:

a radially expansible tubular frame; and

a plastically expansible liner disposed over at least a portion of at least one of an inner surface of the frame and an outer surface of the frame, the liner comprising a circumferentially oriented yarn including fully drawn fiber which defines a maximum expanded perimeter of the liner.

22. An expansible liner stent-graft as claimed in claim 16, wherein the circumferential yarn comprises texturized fully drawn fiber.

23. An expansible liner stent-graft as claimed in claim 16, wherein the circumferential yarn comprises annealed fully drawn fiber.

24. An expansible liner stent-graft as claimed in claim 16, wherein the frame self-expands beyond the maximum perimeter.

17. An expansible liner stent-graft comprising:

a radially expansible tubular frame; and

a plastically expansible liner disposed over at least a portion of at least one of an inner surface of the frame and an outer surface of the frame, the liner comprising a circumferentially oriented yarn including fully drawn fiber which defines a maximum expanded perimeter of the liner, wherein the fully drawn fiber is wound around a second fiber, wherein the second fiber is expansible, and wherein the maximum perimeter is defined by straightening the fully drawn fiber.

18. An expansible liner stent-graft as claimed in claim 17, wherein the second fiber comprises an elastic fiber.

19. An expansible liner stent-graft as claimed in claim 18, wherein the elastic fiber comprises a material selected from the group consisting of spandex and urethane.

20. An expansible liner stent-graft as claimed in claim 17, wherein the expansible fiber comprise s a material selected from the group consisting of partially oriented fiber, monofilament, PTFE, collagen, natural wool proteins, side-chain crystallizable polymers, and hydrogels.

21. An expansible liner stent-graft as claimed in claim 17, wherein the second fiber comprises a low strength fiber.