Radiopaque coating for biomedical devices
First Claim
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1. An intraluminal medical device for placement within a vascular structure comprising:
- a. a flexible body; and
b. a porous columnar metallic coating comprising a plurality of independent columnar structures separated from one another by an opening and disposed on at least a portion of the flexible body, wherein(i) the porous columnar metallic coating extends in a substantially normal direction from a surface of at least a portion of the flexible body;
(ii) flaking of the porous columnar metallic coating being less than 1% of the porous columnar metallic coated surface when the flexible body and porous columnar metallic coating are strained up to 8%; and
(iii) the combination of the size of the columnar structures of the porous columnar metallic coating and the size of the openings between the columnar structures of the porous columnar metallic coating results in an emissivity in the visible spectrum range of at least 80%.
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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.
126 Citations
30 Claims
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1. An intraluminal medical device for placement within a vascular structure comprising:
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a. a flexible body; and b. a porous columnar metallic coating comprising a plurality of independent columnar structures separated from one another by an opening and disposed on at least a portion of the flexible body, wherein (i) the porous columnar metallic coating extends in a substantially normal direction from a surface of at least a portion of the flexible body; (ii) flaking of the porous columnar metallic coating being less than 1% of the porous columnar metallic coated surface when the flexible body and porous columnar metallic coating are strained up to 8%; and (iii) the combination of the size of the columnar structures of the porous columnar metallic coating and the size of the openings between the columnar structures of the porous columnar metallic coating results in an emissivity in the visible spectrum range of at least 80%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An intraluminal medical device for placement within a vascular structure comprising:
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a. a flexible body fabricated from a shape memory alloy having an Af value below body temperature; and b. a porous columnar metallic coating disposed on at least a portion of the flexible body comprising a plurality of independent columnar structures separated from one another by an opening, wherein (i) the independent columnar structures extend in a substantially normal direction from a surface of at least a portion of the flexible body; (ii) the flexible body and porous columnar metallic coating are operable to withstand strains up to 8%, wherein flaking of the porous columnar metallic coating is less than 1%; and (iii) the combination of the sizes of the independent columnar structures of the porous columnar metallic coating and the sizes of the openings between the independent columnar structures results in an emissivity in the visible spectrum range of at least 80%. - View Dependent Claims (25, 26)
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27. An intraluminal stent, comprising:
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a. a substrate body fabricated from a shape memory alloy, wherein the shape memory alloy comprises first Af value below body temperature before a porous columnar metallic coating is applied to a surface of at least a portion of the substrate body; and b. the porous columnar metallic coating comprising a plurality of independent columnar structures separated from one another by a space, wherein each of the independent columnar structures extend in a substantially normal direction from the surface of at least a portion of the substrate body and the porous columnar metallic coating has an emissivity in the visible spectrum range of at least 80%. - View Dependent Claims (28, 29, 30)
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Specification