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, said alloy exhibiting a stress-strain curve that approximates the idealized stress-strain curve of binary nickel-titanium,wherein the body is radiopaque and the tubular-shaped body includes a strut pattern with struts no greater than 0.0046 inch in width.
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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
19 Claims
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1. Radiopaque tubing, comprising:
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a tubular-shaped body wherein the body includes a nickel-titanium superelastic alloy with a ternary element including tungsten, said alloy exhibiting a stress-strain curve that approximates the idealized stress-strain curve of binary nickel-titanium, wherein the body is radiopaque and the tubular-shaped body includes a strut pattern with struts no greater than 0.0046 inch in width. - View Dependent Claims (2, 3, 4, 5, 6, 7, 17)
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8. 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, said alloy exhibiting a stress-strain curve that approximates the idealized stress-strain curve of binary nickel-titanium; wherein the tubular-shaped body is formed from a nickel-titanium-tungsten tubing that has undergone cold forming and heat treating and the tubular-shaped body includes a strut pattern with struts no greater than 0.0046 inch in width. - View Dependent Claims (9, 10, 11, 12, 18)
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13. Radiopaque tubing for medical applications, comprising, wherein said alloy exhibits a stress-strain curve that approximates the idealized stress-strain curve of binary nickel-titanium;
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a tubular body including a nickel-titanium alloy with at least a ternary element including tungsten, said alloy exhibiting a stress-strain curve that approximates the idealized stress-strain curve of binary nickel-titanium; and wherein the tubular body includes approximately 5 to 12 atomic percent tungsten such that the tubular body is radiopaque and the tubular-shaped body includes a strut pattern with struts no greater than 0.0046 inch in width. - View Dependent Claims (14, 15, 16, 19)
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Specification