Radiopaque coating for biomedical devices
First Claim
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1. A medical device comprising:
- a. a body at least partially comprising a radio transparent material; and
b. a porous Ta coating on at least a portion of the body;
wherein the Ta coating is sufficiently thick so that the device is radiopaque and the Ta coating is able to withstand the strains produced in the use of the device without unacceptable flaking;
wherein the Ta is applied to the body via one of a generally oblique coating flux or a low energy coating flux.
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Abstract
A medical device has a porous radiopaque coating that can withstand the high strains inherent in the use of such devices without delamination. A coating of Ta is applied to a medical device, such as a stent, by vapor deposition so that the thermomechanical properties of the stent are not adversely affected. The coating preferable has high emissivity. The coating is applied via a generally oblique coating flux or a low energy coating flux.
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Citations
25 Claims
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1. A medical device comprising:
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a. a body at least partially comprising a radio transparent material; and
b. a porous Ta coating on at least a portion of the body;
wherein the Ta coating is sufficiently thick so that the device is radiopaque and the Ta coating is able to withstand the strains produced in the use of the device without unacceptable flaking;
wherein the Ta is applied to the body via one of a generally oblique coating flux or a low energy coating flux. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for depositing a Ta layer on a medical device consisting of the steps of:
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a. maintaining a background pressure of inert gas in a sputter coating system containing at least one Ta sputter target;
b. applying a voltage to said Ta target to cause sputtering; and
c. sputtering for a period of time to produce the desired coating thickness;
wherein the Ta layer has an emissivity in the visible spectrum of at least 80% and wherein the Ta is applied to the medical device via one of a generally oblique coating flux or a low energy coating flux. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A medical device comprising:
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a. a body having an outer layer; and
b. a radiopaque coating on at least a portion of the outer layer;
wherein the coating is applied via one of a generally oblique coating flux or a low energy coating flux using a physical vapor deposition process.
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25. A medical device comprising:
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a. a body at least partially comprising a radio transparent material;
b. a Ta coating on at least a portion of the body;
wherein the Ta coating is able to withstand the strains produced in the use of the device without unacceptable flaking and wherein the Ta is applied to the body via one of the generally oblique coating flux or a low energy coating flux.
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Specification