Implantable expandable medical devices having regions of differential mechanical properties and methods of making same
First Claim
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1. An implantable, geometrically expandable, endoluminal, nickel-titanium stent, comprising:
- a) a plurality of circumferential support members, each having a plurality of generally linear members interconnected by plurality of first hinge members thereby forming a generally sinusoidal array;
b) a plurality of interconnecting members each having at least one second hinge member interconnecting adjacent pairs of circumferential rings;
c) wherein when introduced in vivo, the plurality of first hinge members are in a substantially austenite phase, and the plurality of second hinge members are in a substantially martensite phase.
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Abstract
An implantable expandable medical device in which selected regions of the device are in a martensite phase and selected regions are in an austenite phase. The martensitic regions exhibit pseudoplastic behavior in vivo and may be deformed without recovery under in vivo body conditions. In contrast the austenitic regions exhibit superelastic behavior in vivo and will recover their pre-programmed configuration upon deformation or release of an applied strain
128 Citations
6 Claims
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1. An implantable, geometrically expandable, endoluminal, nickel-titanium stent, comprising:
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a) a plurality of circumferential support members, each having a plurality of generally linear members interconnected by plurality of first hinge members thereby forming a generally sinusoidal array;
b) a plurality of interconnecting members each having at least one second hinge member interconnecting adjacent pairs of circumferential rings;
c) wherein when introduced in vivo, the plurality of first hinge members are in a substantially austenite phase, and the plurality of second hinge members are in a substantially martensite phase. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification