Variable density braid stent

• US 7,763,011 B2
• Filed: 12/22/2003
• Issued: 07/27/2010
• Est. Priority Date: 12/22/2003
• Status: Active Grant

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Ortiz, John, Musbach, Frank, Molaei, Masoud, Gerberding, Brent C.
• Primary Examiner(s): Stephens; Jacqueline F.
• Application Number:
  US10/744,533
• Publication Number:
  US 20050137680A1
• Time in Patent Office: 2,409 Days
• Field of Search: 604/103, 604/103.01, 604/103.02, 604/103.05, 604/104, 604/509, 604/510, 623/1.16, 623/1.13, 623/1.11, 623/1.23, 606191-198
• US Class Current: 604/509
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2250/0015 differing in density or specific weight
• CPC Class Codes: A61F 2250/0023 differing in porosity
• CPC Class Codes: A61F 2250/0048 differing in mechanical expandability, e.g. in mechanical, self- or balloon expandability
• CPC Class Codes: D04C 1/06 Braid or lace serving particular purposes

Abstract

A stent comprises at least one stent member woven to form a substantially tubular body that defines a flow path. The tubular body comprises a first region and a second region. In the first region the at least one stent member defines a plurality of first region openings and in the second region at least one first portion of the at least one member and at least one second portion of the at least one member are engaged together to form at least one primary strand. The at least one primary strand defines a plurality of second region openings. The at least one of the plurality of second region openings is in fluid communication with the flow path. The plurality of second region openings provide the second region with a greater porosity than the first region.

Claims

1. A stent comprising:

a plurality of stent members, the plurality of stent members interwoven to form a substantially tubular body, the substantially tubular body defining a flow path therethrough, the substantially tubular body comprising a first region and a second region, the second region being immediately adjacent to the first region,

the first region comprising the plurality of stent members interwoven to form a first braid defining a plurality of first region openings,

the second region comprising at least one second braid, the at least one second braid comprising at least one strand, the at least one strand comprising at least two of the plurality of stent members, the at least one second braid defining a plurality of second region openings, at least one of the plurality of second region openings being in bodily fluid communication with the flow path, the plurality of second region openings providing the second region with a greater porosity than the first region.

2. The stent of claim 1 wherein the substantially tubular body further comprises a third region, the third region being immediately adjacent to the second region, the third region comprising at least one third braid, the at least one third braid comprising at least one strand defining a plurality of third region openings, the at least one strand of the at least one third braid comprising at least four of the plurality of stent members, at least one of the plurality of third region openings being in bodily fluid communication with the flow path, the plurality of third region openings providing the third region with a greater porosity than the first region.

3. The stent of claim 2 wherein the at least one of the plurality of third region openings has a greater area than any one of the plurality of first region openings.

4. The stent of claim 2 wherein the at least one of the plurality of third region openings has a greater area than any one of the second region openings.

5. The stent of claim 2 wherein the at least one of the plurality of third region openings has an area of about 0.05 mm² to about 0.3 mm².

6. The stent of claim 2 wherein the second braid comprises at least two strands, the at least two strands of the second braid are braided together to form the at least one third braid.

7. The stent of claim 1 wherein the at least one of the plurality of second region openings has a greater area than any one of the plurality of first region openings.

8. The stent of claim 1 wherein each of the plurality of first region openings has an area of about 0.005 mm² to about 0.15 mm².

9. The stent of claim 1 wherein the at least one of the plurality of second region openings has an area of about 0.05 mm² to about 0.3 mm².

10. The stent of claim 1 wherein the at least one member has a diameter of about 0.001 inch to about 0.00125 inch.

11. The stent of claim 1 wherein at least two of the plurality of members of the first braid are braided together to form the at least one second braid.

12. The stent of claim 1 wherein at least a portion of the tubular body is self-expandable, balloon expandable and/or hybrid expandable.

13. The stent of claim 1 wherein at least a portion of one of the first region and the second region is balloon expandable and at least different portion of one of the first region and the second region is self-expandable.

14. The stent of claim 1 wherein the at least one stent member is at least partially constructed from a shape memory material.

15. The stent of claim 1 wherein the at least one stent member is at least partially constructed from nitinol.

16. The stent of claim 1 wherein at least a portion of the stent is coated with at least one therapeutic agent.