Nickel-titanium alloy including a rare earth element

Details Nickel-titanium alloy including a rare earth element Nickel-titanium alloy including a rare earth element

C - Chemistry, Metallurgy

22

C

C22C 19/03 (2006.01) C22C 1/02 (2006.01) C22C 14/00 (2006.01)

Patent

CA 2658580

Disclosed herein is a nickel-titanium alloy comprising nickel, titanium, and at least one rare earth element, wherein the at least one rare earth element is selected from the group consisting of La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ac, Tn, Pa and U. The nickel-titanium alloy comprises from about 34 at.% to about 60 at.% nickel, from about 34 at.% to about 60 at.% titanium, and from about 0.1 at.% to about 15 at.% at least one rare earth element. The nickel-titanium alloy may further include one or more additional alloying elements. In addition to radiopacity, the nickel-titanium alloy preferably exhibits superelastic or shape memory behavior. Medical devices comprising the nickel-titanium alloy and a method of making them are also disclosed.

L'invention concerne un alliage nickel-titane qui comprend du nickel, du titane et au moins un élément de terre rare, où ledit au moins un élément de terre rare est choisi dans le groupe constitué par La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ac, Tn, Pa et U. L'alliage nickel-titane comprend d'environ 34 % de masse atomique à environ 60 % de masse atomique de nickel, d'environ 34 % de masse atomique à environ 60 % de masse atomique de titane et d'environ 0,1 % de masse atomique à environ 15 % de masse atomique d'au moins un élément de terre rare. L'alliage nickel-titane peut inclure en outre un ou plusieurs éléments d'alliage supplémentaires. En plus de la radio-opacité, l'alliage nickel-titane présente de préférence un comportement superélastique ou de mémoire de forme. L'invention concerne également les dispositifs médicaux qui comprennent l'alliage nickel-titane et un procédé permettant de les fabriquer.

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