NITINOL ALLOY DESIGN AND COMPOSITION FOR VASCULAR STENTS
First Claim
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1. A stent and a delivery system for implanting the stent in a body lumen, comprising:
- a cylindrically-shaped stent including a superelastic alloy, wherein the alloy includes a ternary element, and wherein the alloy further includes a substantially small stress hysteresis; and
a delivery system including a sheath having a distal end and a proximal end, wherein the stent is disposed inside the sheath at the distal end, and wherein the delivery system has a small profile.
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Abstract
A stent and a delivery system for implanting the stent 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 in order to minimize the stress hysteresis of the superelastic material. The stress hysteresis is defined by the difference between the loading plateau stress and the unloading plateau stress of the superelastic material. The resulting delivery system has a small profile and includes a sheath covering the stent that has a thin wall.
108 Citations
20 Claims
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1. A stent and a delivery system for implanting the stent in a body lumen, comprising:
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a cylindrically-shaped stent including a superelastic alloy, wherein the alloy includes a ternary element, and wherein the alloy further includes a substantially small stress hysteresis; and a delivery system including a sheath having a distal end and a proximal end, wherein the stent is disposed inside the sheath at the distal end, and wherein the delivery system has a small profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A stent and a delivery system for implanting the stent in a body lumen, comprising:
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a self-expanding, cylindrically-shaped stent including a nickel-titanium alloy, wherein the nickel-titanium alloy includes a ternary element, and wherein the alloy further includes a substantially small stress hysteresis; a delivery system including an inner member having a distal end and a proximal end, wherein the stent is disposed at the distal end; and the delivery system further including a sheath having a distal end and a proximal end, wherein at least the distal end of the sheath is slidably disposed over the stent, and wherein the delivery system has a small profile. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for implanting a stent in a body lumen, comprising the steps of:
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providing a self-expanding, cylindrically-shaped stent including a nickel-titanium alloy, wherein the nickel-titanium alloy includes a ternary element, and wherein the alloy further includes a substantially small stress hysteresis; providing a delivery system including an inner member having a distal end and a proximal end, wherein the delivery system has a small profile; disposing the stent at the distal end of the delivery system; providing a sheath as part of the delivery system, the sheath having a distal end and a proximal end; and slidably disposing the sheath over the stent. - View Dependent Claims (18, 19, 20)
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Specification