MULTILAYER STENT
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Accused Products
Abstract
A composite stent having a substrate tube made of stainless steel, a nickel-cobalt-chromium-molybdenum alloy, or chonichrome with at least one metal cladding tube is disclosed. Specifically, the substrate tube is placed within a metal cladding tube made of platinum, gold, tantalum, tungsten, platinum-iridium, palladium, or nickel-titanium, preferably with an interference fit therebetween. The composite, laminate tube then undergoes a series of rolling or cold drawing processes interspersed with heat treating to release built up stresses. When the final diameter of the laminate tube is reached, the cladding has been laminated to the exterior of the substrate tube by a bond generated from the rolling and/or cold drawing operations. The finished laminate tube is then cut by laser cutting or chemical etching to form a suitable stent pattern.
106 Citations
55 Claims
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1-38. -38. (canceled)
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39. A laminate stent for implantation within a body lumen, comprising:
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a substrate tube formed from a superelastic alloy and having an exterior surface; a first cladding layer formed from a metallic radiopaque material and bonded to the exterior surface of the substrate tube; a second metallic cladding layer comprising a NiTi alloy bonded to the first layer thereby forming a laminate tube; and a stent pattern formed in the laminate tube such that the resultant laminate stent includes a plurality of radially expandable cylindrical elements disposed generally coaxially and interconnected by elements disposed between adjacent cylindrical elements, the cylindrical elements and the interconnecting elements being entirely formed of the substrate tube, the first radiopaque cladding layer, and the second metallic cladding layer. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification