Thermoelastic and superelastic Ni-Ti-W alloy

Details Thermoelastic and superelastic Ni-Ti-W alloy Thermoelastic and superelastic Ni-Ti-W alloy

2004-08-13

2010-02-09

Sweet, Thomas J (Department: 3774)

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

Arterial prosthesis

Stent structure

C623S001340

Reexamination Certificate

active

07658760

ABSTRACT:
A radiopaque nitinol stent for implantation in a body lumen is disclosed. The stent is made from a superelastic alloy such as nickel-titanium or nitinol, and includes a ternary element including tungsten. The added tungsten in specified amounts improve the radiopacity of the nitinol stent comparable to that of a stainless steel stent of the same strut pattern coated with a thin layer of gold. Furthermore, the nitinol stent has improved radiopacity yet retains its superelastic and shape memory behavior and further maintains a thin strut/wall thickness for high flexibility.

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