Medical devices and methods of making the same
First Claim
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1. A stent, comprising:
- a tubular member defined by struts and openings, the tubular member including at least a first portion comprising an alloy of two or more elements, the alloy having a concentration gradient of at least one radiopaque element within the alloy, the first portion defining an outer surface of the tubular member, wherein the concentration of the at least one radiopaque element increases as a function of distance from the outer surface.
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Abstract
An endoprosthesis, such as a stent, having a layer that can enhance the biocompatibility of the endoprosthesis, and methods of making the endoprosthesis are disclosed.
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Citations
20 Claims
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1. A stent, comprising:
a tubular member defined by struts and openings, the tubular member including at least a first portion comprising an alloy of two or more elements, the alloy having a concentration gradient of at least one radiopaque element within the alloy, the first portion defining an outer surface of the tubular member, wherein the concentration of the at least one radiopaque element increases as a function of distance from the outer surface. - View Dependent Claims (2, 3, 4, 5, 6, 19, 20)
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7. A stent, comprising:
a tubular member defined by struts and openings having a first portion; and a second portion disposed outwardly of the first portion, the second portion being more radiopaque than the first layer and including an alloy of two or more elements, the alloy having a concentration gradient of at least one radiopaque element within the alloy, wherein the concentration of the at least one radiopaque element increases as a function of distance from the outer surface an outer layer of the second portion having a lower oxidation potential than an oxidation potential of an inner layer of the second portion. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A stent, comprising:
a tubular member defined by struts and openings, the tubular member having at least a first portion including a first layer comprising a radiopaque material, and a second layer comprising an alloy of the radiopaque material and at least one additional element, the second layer defining an outer surface of the member, the second layer having a lower oxidation potential than an oxidation potential of the first layer, wherein the alloy of the second layer has concentration gradient of the radiopaque material that varies substantially linearly along a thickness of the second layer. - View Dependent Claims (18)
Specification