Braided stent having tapered filaments

• US 6,325,822 B1
• Filed: 01/31/2000
• Issued: 12/04/2001
• Est. Priority Date: 01/31/2000
• Status: Expired due to Term

• Current Assignee: Lifeshield Sciences LLC (Acacia Research Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Chouinard, Paul F., Haverkost, Patrick A., Roberts, George T., Peiffer, Dennis A.
• Primary Examiner(s): Recla, Henry J.
• Assistant Examiner(s): HO, TAN-UYEN THI
• Application Number:
  US09/494,980
• Time in Patent Office: 673 Days
• Field of Search: 623/1-1-, 623/1.51, 623/1.52, 623/1.53, 623/1.54, 623/1.42, 623/1.43, 623/901
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2220/0008 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2250/0036 differing in thickness
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: D04C 1/06 Braid or lace serving particular purposes
• CPC Class Codes: D04C 3/48 Auxiliary devices
• CPC Class Codes: D10B 2509/06 Vascular grafts; stents

Abstract

A method and stent for treating a lumen, the stent comprising a plurality of continuous filaments braided together, at least one filament comprising a tapered filament having at least one first region having a first, relatively-larger cross-sectional area and at least one second region having a second, relatively-smaller cross-sectional area. The stent itself may have a tapered diameter, such as from one end to the other.

Claims

1. A stent for deployment in a lumen, the stent comprising a plurality of continuous filaments braided together, at least one filament comprising a tapered filament having at least one first region having a first cross-sectional area and at least one second region having a second cross-sectional area, wherein the first cross-sectional area is larger than the second cross-sectional area.

2. The stent of claim 1 wherein all of the plurality of continuous filaments are tapered filaments.

3. The stent of claim 2 wherein one end portion of the braided stent comprises the first region of said tapered filaments and an other end portion of the braided stent comprises the second region of said tapered filaments.

4. The stent of claim 2 wherein each tapered filament comprises at least two first regions and the stent comprises at least two opposite ends and a middle, the ends of the stent comprising the first regions of the tapered filaments and the middle of the stent comprising the second region of the tapered filaments.

5. The stent of claim 2 wherein each tapered filament comprises at least two second regions and the stent comprises at least two opposite ends and a middle, the ends of the stent comprising the second regions of the tapered filaments and the middle of the stent comprising the first region of the tapered filaments.

6. The stent of claim 1 wherein the stent comprises an end having atraumatic end windings.

7. The stent of claim 6 wherein the end having the atraumatic end windings comprises a braided end having continuous apices.

8. The stent of claim 6 wherein the end having the atraumatic end windings comprises a non-braided end.

9. The stent of claim 8 wherein the atraumatic end windings comprise continuous apices.

10. The stent of claim 1 wherein the stent tapers from a first end having a first diameter to a second end having a second diameter smaller than the first diameter.

11. The stent of claim 10 wherein the stent comprises the first region of the tapered filament having the first cross-sectional area at the first end of the stent and the second region of the tapered filament having the second cross-sectional area at the second end of the stent.

12. The stent of claim 10 further comprising an intermediate portion of the stent having a third diameter intermediate the fist and second diameters.

13. The stent of claim 1 wherein the tapered filament further comprises a third region having a cross-sectional area intermediate the first and second cross-sectional areas.

14. The stent of claim 13 wherein the stent comprises the third region of the tapered filament having the third cross-sectional area in an intermediate portion of the stent having a third diameter intermediate the first and second diameters.

15. The stent of claim 1 wherein the stent comprises a first portion and a second portion, wherein the second portion is more flexible than the first portion and comprises the second region of the tapered filament having the second cross-sectional area.

16. The stent of claim 1 wherein the tapered filaments comprise wire.

17. The stent of claim 16 wherein the wire comprises one of:

nitinol or stainless steel.

18. The stent of claim 1 wherein the tapered filaments comprise polymeric material.

19. The stent of claim 1 wherein the stent comprises a radially compressed configuration for introduction into the lumen and a radially expanded configuration for deployment within the lumen.

20. The stent of claim 19 wherein the stent is expandable between the radially compressed configuration and the radially expanded configuration by one of:

balloon expansion, self-expansion via spring elasticity, or self-expansion via a thermally or stress-induced return of a pre-conditioned memory material.

21. The stent of claim 1 wherein the stent comprises one of:

a 1;

1 single filament braiding ratio, a 2;

2 single filament braiding ratio, or a 1;

1 paired filament braiding ratio.

22. A method for treating a diseased lumen of a human being, the method comprising the step of deploying within the lumen a stent comprising a plurality of continuous filaments braided together, at least one filament comprising a tapered filament having at least one first region having a first cross-sectional area and at least one second region having a second cross-sectional area, wherein the first cross-sectional area is larger than the second cross-sectional area.