Thermoelastic and superelastic Ni-Ti-W alloy
First Claim
Patent Images
1. Radiopaque tubing, comprising:
- a tubular-shaped body wherein the body includes a nickel-titanium superelastic alloy with a ternary element including tungsten;
wherein the tubular-shaped body is formed from a nickel-titanium-tungsten tubing having an austenite finish temperature of −
15°
to 0°
C., wherein the body is radiopaque.
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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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Citations
17 Claims
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1. Radiopaque tubing, comprising:
-
a tubular-shaped body wherein the body includes a nickel-titanium superelastic alloy with a ternary element including tungsten;
wherein the tubular-shaped body is formed from a nickel-titanium-tungsten tubing having an austenite finish temperature of −
15°
to 0°
C., wherein the body is radiopaque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A superelastic, radiopaque metallic tubing for medical applications, comprising:
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a tubular-shaped body, wherein the body includes a superelastic nickel-titanium alloy and the alloy further includes tungsten;
wherein the tubular-shaped body is formed from a nickel-titanium-tungsten tubing that has undergone cold forming and heat treating and has an active austenite finish temperature Af defined by −
15°
C.≦
active Af≦
0°
C. - View Dependent Claims (10, 11, 12, 13)
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14. Radiopaque tubing for medical applications, comprising:
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a tubular body including a nickel-titanium alloy with at least a ternary element including tungsten, and the tubular body has an austenite finish temperature of −
15°
C. to 0°
C.; and
wherein the tubular body includes approximately 5 to 12 atomic percent tungsten such that the tubular body is radiopaque. - View Dependent Claims (15, 16, 17)
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Specification