iMechanica - durability - Comments

Fatigue Tests with Nitinol Stents in peripheral arteries

iker — Fri, 17 Aug 2007 02:31:32 -0400

Dear all,

I've read your interesting comments concerning Fatigue tests and Nitinol stent topics. As you know there are several concenrs from the medical field about which fatigue test should be performed (radial cpmpression and/or bending and/or axial compression and/or torsion) with nitinol stents for peripheral application. As, mechanical engineer working with physicians I try to get from them "real data and values". I mean, which is the bending value of the arteries, axial compression and so on.

You all, as expert in such interesting field, could you please, which Fatigue test you think should ne necessary to perform and which loading conditions

my best regards and I looking forward hearing soon from you

iker

Zhigang, This is the link to

Xiao-Yan Gong — Wed, 04 Oct 2006 09:42:56 -0400

Zhigang,

This is the link to NDC's paper on Nitinol fatigue. http://www.nitinol.info/pdf_files/001.pdf

I will upload my collection of Nitinol fatigue and papers to my web site and let you know as soon as I have it done. The poll result came from "Stent Summit 06" conference at Cleveland Clinic in August 2006.

This link takes you to the ASTM fatigue to fracture and beyond task group's file archieve and tell you the stent industry's activity on this subject. If you have trouble to access it, please let me know.

http://finance.groups.yahoo.com/group/allmembersASTMF043006/files/Fatigue%20to%20Fracture%20and%20Beyond%20task%20group/

Xiao-Yan Gong, PhD

Any good refs of industrial efforts on implant reliability?

Zhigang Suo — Tue, 03 Oct 2006 08:43:37 -0400

Xiao-Yan:

This post, as well as your earlier post, Mechanics in Medical Implant Industry, is very helpful to us at universities. They point to a rich field that few of us know much about. One of my new PhD students came in yesterday to say that he would love to work on your problems. He was showing me a printout of your post!

As you know, we at universities have limited resources and time, just like everyone else. Each one of us cannot afford to do many things at the same time. Before we commit to anything, we do what academics do: we read background materials, and try to link new problems to our old strengths.

You will find more willing and effective collaborators if you give us some references to the problem. For example, do you have a reference to the industrial poll on Nitinol fatigue, which you alluded to in your comment?

We would love to read more and in depth of your writings on this exiting topic. To save your time, perhaps you can upload some preprints. Of course, you can always make hyperlinks or cite journal paper.