Thermoelastic and superelastic Ni-Ti-W alloy
First Claim
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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 nickel-titanium superelastic alloy includes;
30 to 52 atomic percent titanium,5 to 12 atomic percent tungsten, anda balance of nickel;
wherein the tubular-shaped body is formed from a nickel-titanium-tungsten tubing having an austenite finish temperature (Af) 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.
113 Citations
12 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 nickel-titanium superelastic alloy includes; 30 to 52 atomic percent titanium, 5 to 12 atomic percent tungsten, and a balance of nickel; wherein the tubular-shaped body is formed from a nickel-titanium-tungsten tubing having an austenite finish temperature (Af) of −
15°
to 0°
C., wherein the body is radiopaque.- View Dependent Claims (2, 3, 4, 5)
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6. A superelastic, radiopaque metallic tubing for medical applications, comprising:
-
a tubular-shaped body including; an atomic percent of nickel of 50.8, an atomic percent of tungsten greater than or equal to 5 and less than or equal to 12, and a balance of titanium; wherein the tubular-shaped body has an active austenite finish temperature Af defined by −
15°
C.≦
active Af≦
0°
C. - View Dependent Claims (7, 8, 9)
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10. Radiopaque tubing for medical applications, comprising:
a tubular body having an austenite finish temperature of −
15°
C. to 0°
C.; andwherein the tubular body includes 5 to 12 atomic percent tungsten, 50.8 atomic percent of nickel, and a balance of titanium such that the tubular body is radiopaque, having a radiopacity comparable to a stainless steel tubing having a thin coating of gold. - View Dependent Claims (11, 12)
Specification