Multi-section filamentary endoluminal stent

• US 20070106370A1
• Filed: 12/22/2006
• Published: 05/10/2007
• Est. Priority Date: 11/16/1999
• Status: Active Grant

• Current Assignee: Lifeshield Sciences LLC (Acacia Research Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Haverkost, Patrick, Chouinard, Paul
• Granted Patent: US 7,771,466 B2
• Time in Patent Office: Days
• US Class Current: 623/1.150
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• 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 2002/067 modular
• CPC Class Codes: A61F 2002/825 having longitudinal struts
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2220/0008 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2220/0066 stapled
• 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 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0028 differing in fibre orientations
• CPC Class Codes: A61F 2250/0029 differing in bending or flexure capacity
• CPC Class Codes: D04C 1/06 Braid or lace serving particular purposes
• CPC Class Codes: D10B 2509/06 : Vascular grafts; stents

Abstract

A multi-section filamentary stent comprises a braided section, which is a cylindrical mesh of a first set of filaments, connected to at least one wound section comprising a second set of one or more filaments having a repeating configuration with a bent portion. The two sections are preferably connected by at least one continuous filament extending into both sections. The two sections may be connected by a weld, a suture, a common graft, an overlapping portion of the two sections, or one or more filaments of one section looping through portions of the other section. The stent may comprise a first section, having a braided first stent architecture with a first flexibility and a first radial force, and a second section, having a non-braided second stent architecture with a second flexibility less than the first flexibility and a second radial force greater than the first radial force, in which at least one continuous filament is integral to both the first and second sections. The stent may have a radially compressed configuration and a radially expanded configuration, in which the first section has a first shortening ratio, and the second section has a second shortening ratio less than the first shortening ratio. Such multi-section stents may comprise modular components of a modular stent, such as a bifurcated modular stent, adapted for joining together in situ. The multi-section stent may comprise a first section having a first percentage of open area and a second section having a second percentage of open area. The stent may also comprise a first section having a first stent architecture with an end effect wherein the radial strength at the end is less than elsewhere in the stent, and a second section having a second stent architecture to counteract the end effect. Methods for treating body lumen by implanting the stents as described herein are also disclosed, as is a method for counteracting a stent architecture end effect.

Claims

1. A stent comprising:

a cylindrical configuration having opposed first and second ends and comprising a braided portion and a wound portion integral with the braided portion; and

a plurality of filaments interbraided to form the braided stent portion, wherein the filaments are bent to define the first opposed end; and

further wherein the filaments are wound in a repeating, non braided configuration to define wound portion and to further define the second opposed open end.

2. The stent of claim 1, wherein the filaments comprise filament ends, and wherein all of the filament ends are disposed at the wound portion of the stent.

3. The stent of claim 1, wherein the filaments comprise filament ends, and wherein none of the filament ends are disposed at the first end of the stent.

4. The stent of claim 1, wherein the repeating, non-braided configuration is selected from the group consisting of a zig-zag configuration, a helical configuration, a non-helical configuration, a polygonal configuration and combinations thereof.

5. The stent of claim 1, wherein the filaments comprise wires.

6. The stent of claim 1, wherein the filaments comprise nitinol.

7. The stent of claim 1, wherein the filaments comprise nitinol wires.

8. The stent of claim 1, wherein the stent is a shape memory expandable and resiliently compressible stent having a fully expanded diameter and a constrained diameter.

9. The stent of claim 1, wherein the plurality of filaments comprise a number of filaments, wherein the braided and wound portions have the same number of filaments.

10. The stent of claim 1, further comprising a biocompatible graft material attached to the stent as an outer covering, an inner liner or a combination thereof.

11. The stent of claim 1, wherein each filament of the plurality of filaments comprises a distinct, individually formed wire of polymer member, and not a portion of slotted metal or cut or etched tubing.

12. The stent of claim 1 further comprising multiple wound portions.

13. The stent of claim 1 further comprising multiple braided portions.

14. The stent of claim 1, wherein the ends of the stent do not contain any protruding loose filament ends.

15. A stent comprising:

a cylindrical configuration having opposed first and second ends and comprising a braided portion; and

a plurality of filaments having filament ends, the filaments being interbraided to form the braided stent portion;

wherein the filaments are bent to define the first opposed end;

wherein the filaments are wound in a repeating, non braided configuration to define the second opposed open end; and

further wherein all of the filament ends are proximally disposed at the second opposed open end of the stent.

16. The stent of claim 15, wherein none of the filament ends are disposed at the first end of the stent.

17. The stent of claim 15, wherein the repeating, non-braided configuration is selected from the group consisting of a zig-zag configuration, a helical configuration, a non-helical configuration, a polygonal configuration and combinations thereof.

18. The stent of claim 15, wherein the filaments comprise wires.

19. The stent of claim 15, wherein the filaments comprise nitinol.

20. The stent of claim 15, wherein the filaments comprise nitinol wires.

21. The stent of claim 15, wherein the stent is a shape memory expandable and resiliently compressible stent having a fully expanded diameter and a constrained diameter.

22. The stent of claim 15, further comprising a biocompatible graft material attached to the stent as an outer covering, an inner liner or a combination thereof.

23. The stent of claim 15, wherein each filament of the plurality of filaments comprises a distinct, individually formed wire of polymer member, and not a portion of slotted metal or cut or etched tubing.

24. The stent of claim 15, wherein the ends of the stent do not contain any protruding loose filament ends.