Atraumatic stent and method and apparatus for making the same

Patent metadata

Field	Value
Publication number	US-10947651-B2
Application number	US-201916364772-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Jan 26, 2009
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A method of braiding a stent includes braiding a number of elongate filaments around a mandrel using tensioned braiding carriers without spooling the filaments to the tensioned braiding carriers to form a braided stent having atraumatic ends.

First claim

What is claimed is:

1. A method of making a braided stent comprising:
securing a plurality of filaments to a first end of a mandrel, the first end of the mandrel having a larger diameter than a body of the mandrel; and
braiding the plurality of filaments along the first end and the body of the mandrel to form a stent with a flared region at a first end, the flared region having a larger diameter than a body of the stent, wherein a braid angle in the flared region of the stent is substantially the same as a braid angle in the body of the stent.

2. The method of claim 1 , wherein the braid angle is 110 degrees+/−3 degrees in both the flared region and body of the stent.

3. The method of claim 1 , wherein braiding includes forming the stent with closed loops at the first end of the stent and closed loops at a second end of the stent.

4. The method of claim 1 , wherein securing the plurality of filaments to the mandrel includes looping an intermediate portion of each filament around one of a plurality of securement projections on the first end of the mandrel, wherein braiding the plurality of filaments includes braiding opposing ends of each filament, thereby forming the stent with closed loops at the first end.

5. The method of claim 4 , wherein a second end of the stent is formed by bending the plurality of filaments into closed loops.

6. The method of claim 4 , wherein each securement projection is longitudinally and circumferentially staggered from a circumferentially adjacent securement projection.

7. The method of claim 4 , wherein each securement projection has a single filament looped therearound.

8. The method of claim 1 , wherein the mandrel defines first parallel helical pathways and second parallel helical pathways that intersect the first parallel helical pathways, wherein during the step of braiding the plurality of filaments, one filament is positioned in each helical pathway.

9. The method of claim 8 , wherein the mandrel has a plurality of raised projections that define the first parallel helical pathways and the second parallel helical pathways, wherein during the step of braiding the plurality of filaments, the plurality of raised projections provide for a substantially constant braiding angle for the plurality of filaments along an entirety of the stent.

10. The method of claim 9 , wherein at least one of the plurality of raised projections has a pyramid shape.

11. The method of claim 9 , wherein securing the plurality of filaments to the mandrel includes looping the plurality of filaments around a plurality of securement projections on the first end of the mandrel, wherein the plurality of raised projections have a different shape than a shape of the plurality of securement projections.

12. The method of claim 9 , wherein the mandrel includes a transition region between the first end and the body of the mandrel, the transition region being sloped and including some of the plurality of raised projections.

13. The method of claim 1 , wherein the mandrel further comprises raised projections aligned in a plurality bands, the plurality of bands including circumferential bands and longitudinal bands, wherein the raised projections in each circumferential band are circumferentially offset from the raised projections of at least one other circumferential band, and the raised projections in each longitudinal band are longitudinally offset from the raised projections of at least one other longitudinal band.

14. A method of making a stent comprising:
securing an intermediate portion of a plurality of filaments to a first end of a mandrel, the mandrel having a second end and a body extending between the first and second ends, the first end having a larger diameter than the body;
braiding opposing ends of each of the plurality of filaments with a substantially constant braid angle along an entirety of the mandrel, thereby forming a stent having a flared first end region with a diameter larger than a body of the stent and a substantially constant braid angle along an entire length of the stent.

15. The method of claim 14 , wherein the braid angle is 110 degrees+/−3 degrees in both the flared first end region and body of the stent.

16. The method of claim 14 , wherein braiding includes forming the stent with closed loops at a second end of the stent.

17. The method of claim 14 , wherein the mandrel has a plurality of raised projections that define first parallel helical pathways and second parallel helical pathways that intersect the first parallel helical pathways, wherein during the step of braiding, one filament is positioned in each helical pathway and the plurality of raised projections provide for the substantially constant braid angle along the entire length of the stent.

18. The method of claim 17 , wherein securing the intermediate portion of the plurality of filaments includes looping the intermediate portion of each filament around one of a plurality of securement projections on the first end of the mandrel, wherein each securement projection is longitudinally and circumferentially staggered from a circumferentially adjacent securement projection.

19. The method of claim 18 , wherein the plurality of raised projections all have a different shape than the plurality of securement projections.

20. A method of making a stent comprising:
looping in an intermediate portion of each of a plurality of filaments around projections at a first end of a mandrel;
braiding opposing ends of each of the plurality of filaments around a body of the mandrel to form a stent having a flared first end, a body, and a second end, wherein the flared first end has a larger diameter than the body, wherein a braid angle in the flared first end is substantially the same as a braid angle in the body and the second end; and
forming loops at the second end of the stent.

Assignees

• Boston Scient Scimed Inc

Inventors

• Lilburn Steve
• Norton Paul K
• Zupkofska Michael E
• Bedard Louis
• Harding Glenn

Classifications

• D04C3/48 Primary

  Auxiliary devices · CPC title

• D04C3/14

  Spool carriers · CPC title

• D04C1/06 Primary

  Braid or lace serving particular purposes · CPC title

• D10B2509/06

  Vascular grafts; stents · CPC title

• A61F2002/91525

  within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude · CPC title