Crush resistant stent
First Claim
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1. A method for maintaining the patency of a body lumen, comprising:
- providing a substantially cylindrically-shaped stent having crush-resistant superelastic properties;
implanting the stent in the body lumen;
providing projections which form on an outer wall surface of the stent and thereby at least partially penetrate an inner wall surface of the body lumen, thus facilitating the attachment of the stent to the inner wall surface of the body lumen so that as an external force is applied to the body lumen, the stent will not migrate and the stent temporarily at least partially collapses, the stent returning to the substantially cylindrical shape to thereby maintain the patency of the body lumen when the external force is removed; and
inducing formation of the projections through an isothermal phase transformation.
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Abstract
The present invention is directed to a method for maintaining the patency of a vessel via a stent while minimizing both the risk of permanent vessel collapse and the risk of dislodgment of the stent from the implant site if the stent is temporarily deformed due to external forces. The method utilizes a crush-resistant stent having either shape memory or superelastic properties.
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Citations
25 Claims
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1. A method for maintaining the patency of a body lumen, comprising:
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providing a substantially cylindrically-shaped stent having crush-resistant superelastic properties;
implanting the stent in the body lumen;
providing projections which form on an outer wall surface of the stent and thereby at least partially penetrate an inner wall surface of the body lumen, thus facilitating the attachment of the stent to the inner wall surface of the body lumen so that as an external force is applied to the body lumen, the stent will not migrate and the stent temporarily at least partially collapses, the stent returning to the substantially cylindrical shape to thereby maintain the patency of the body lumen when the external force is removed; and
inducing formation of the projections through an isothermal phase transformation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for maintaining the patency of a body lumen, comprising:
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providing a substantially cylindrically-shaped stent having crush-resistant superelastic properties;
implanting the stent in the body lumen;
providing projections that form on an outer wall surface of the stent;
inducing formation of the projections through an isothermal phase transformation;
wherein the stent is formed from a metal alloy selected from the group of metal alloys consisting of copper-zinc, copper-zinc-aluminum, copper-zinc-gallium, copper-zinc-tin, copper-zinc-silicon, copper-aluminum-nickel, copper-aluminum-zinc, copper-tin, gold-cadmium, nickel-aluminum, or iron-platinum.
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18. A stent for maintaining the patency of a body lumen, comprising:
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a cylindrically shaped body having an outer wall surface, and including a plurality of cylindrical elements arranged coaxially;
connecting members interconnecting adjacent cylindrical elements;
wherein the stent includes a superelastic alloy that undergoes a first isothermal phase transformation when stressed; and
projections formed in the outer wall surface through a second isothermal phase transformation during expansion of the stent. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification