Protective coating for a stent with intermediate radiopaque coating
First Claim
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1. A stent for implanting in a body lumen, comprising:
- an elongated tubular body being a substantially radiolucent first metal;
a radiopaque layer of a second metal different from the first metal covering at least a portion of the elongated tubular body; and
a protective layer covering the elongated tubular body and radiopaque layer, the protective layer having a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and to protect the layers from mishandling;
wherein the protective layer includes a polymeric or a ceramic material.
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Abstract
The invention relates to coated stents and the method of making them. A stent that is substantially radiolucent is at least partially coated with a radiopaque layer that makes the stent visible under X-ray or fluoroscopy. A protective layer is coated on the stent and the radiopaque layer to protect both from scratches, flaking, and galvanic corrosion, and to improve both blood and bio-compatability.
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Citations
17 Claims
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1. A stent for implanting in a body lumen, comprising:
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an elongated tubular body being a substantially radiolucent first metal;
a radiopaque layer of a second metal different from the first metal covering at least a portion of the elongated tubular body; and
a protective layer covering the elongated tubular body and radiopaque layer, the protective layer having a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and to protect the layers from mishandling;
wherein the protective layer includes a polymeric or a ceramic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for protecting a stent from the electrochemical reaction that causes galvanic corrosion, the method comprising:
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providing an elongated tubular body being substantially radiolucent first metal;
applying a radiopaque layer of a second metal different from the first metal on at least a portion of the elongated tubular body; and
applying a protective layer on the elongated tubular body and the radiopaque layer in a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and to protect the layers from mishandling;
the protective layer covering all of the radiopaque layer and that portion of the elongated tubular body not covered by the radiopaque layer;
wherein the protective layer includes a polymeric or a ceramic material. - View Dependent Claims (11, 12)
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13. A stent for implanting in a body lumen, comprising:
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an elongated tubular body being a substantially radiolucent first metal; and
a protective layer covering the elongated tubular body, the protective layer having radiopaque means of a second metal different from the first metal for increasing visibility under fluoroscopy, the protective layer having a thickness effective to protect against the electrochemical reaction leading to galvanic corrosion;
wherein the protective layer includes a polymeric or a ceramic material. - View Dependent Claims (14, 15)
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16. A stent for implanting in a body lumen, comprising:
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an elongated tubular body being a substantially radiolucent first metal;
a protective layer covering the elongated tubular body; and
a radiopaque layer of a second metal different from the first metal covering at least a portion of the protective layer so that the stent is visible under fluoroscopic x-ray, the protective layer having a thickness effective to reduce the likelihood of galvanic corrosion between the radiopaque layer and the elongated tubular body;
wherein the protective layer includes a polymeric or a ceramic material.
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17. A stent for implanting in a body lumen, comprising:
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an elongated tubular body being a substantially radiolucent first metal;
a radiopaque layer of a second metal different from the first metal covering at least a portion of the elongated tubular body; and
a protective layer covering at least a portion of the elongated tubular body and having a thickness effective to reduce the likelihood of galvanic corrosion between the elongated tubular body and the radiopaque layer and wherein the protest the layer is biocompatible and blood compatible;
wherein the protective layer includes a polymeric or a ceramic material.
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Specification