Method for producing strain induced austenite

Details Method for producing strain induced austenite Method for producing strain induced austenite

2011-08-02

2011-08-02

Isabella, David (Department: 3738)

Prosthesis (i.e., artificial body members), parts thereof, or ai

Arterial prosthesis

Stent structure

C623S001190, C623S001150

Reexamination Certificate

active

07988722

ABSTRACT:
This invention relates to medical devices comprising shape memory alloys which have been subjected to a thermal and mechanical treatment to increase the austenite start temperature Asto As′ such that the shape memory alloy is martensitic at body temperature and when subsequently subjected to a controlled deformation, the shape memory alloy preferentially reverts to the parent phase. The shape memory alloy comprises nickel, titanium and a ternary element, preferably 3 at. % to about 20 at. %. The ternary element is insoluble in a Ni—Ti matrix. In a preferred embodiment, the element is selected from the group consisting of niobium, tantalum and zirconium.

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