Implant having high fatigue resistance, delivery system, and method of use

Patent metadata

Field	Value
Publication number	US-9629734-B2
Application number	US-201314051680-A
Country	US
Kind code	B2
Filing date	Oct 11, 2013
Priority date	Jun 16, 2006
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

According to one aspect of the present invention, a fatigue resistant stent comprises a flexible tubular structure having an inside diameter, an outside diameter, and a sidewall therebetween and having apertures extending through the sidewall. According to other aspects of the invention, processes for making a fatigue resistant stent are disclosed. According to further aspects of the invention, delivery systems for a fatigue resistant stent and methods of use are provided.

First claim

What is claimed is:

1. A method of shape setting an implant comprising a nickel titanium alloy, the method comprising:
(a) restraining the implant on a mandrel having a first diameter and annealing the implant within a first temperature range;
(b) after (a), restraining the implant on a mandrel having a second diameter and annealing the implant within a second temperature range that is higher than the first temperature range; and
(c) after (b), annealing the implant within a third temperature range that is lower than the second temperature range and while the implant is restrained on a mandrel; and
wherein the second diameter is larger than the first diameter.

2. The method of claim 1 , wherein the first temperature range is 482-488° C.

3. The method of claim 1 , wherein the second temperature range is 598-602° C.

4. The method of claim 1 , wherein the third temperature range is 482-488° C.

5. The method of claim 1 , wherein (a) comprises multiple anneals.

6. The method of claim 5 , wherein each of the multiple anneals in (a) are carried out for no longer than 2.5 minutes.

7. The method of claim 1 , further comprising after (a) and before (b), successively restraining and annealing the implant within the first temperature range on mandrels of increasing diameters.

8. The method of claim 1 , wherein (b) comprises annealing the implant at 598-602° C. for 45 to 60 seconds.

9. The method of claim 1 , wherein (c) comprises annealing the implant at 482-488° C. for 5 minutes.

Assignees

• Covidien Lp

Inventors

• Ma Jianlu
• Tatalovich Joe
• Wang Lixiao
• Zhao Xiaoling
• Ranum Dan

Classifications

• A61F2250/0071

  breakable or frangible · CPC title

• A61F2/89

  the wire-like elements comprising two or more adjacent rings flexibly connected by separate members · CPC title

• A61F2/91

  made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes · CPC title

• A61F2210/0004

  bioabsorbable · CPC title

• C22C19/03

  based on nickel · CPC title