Multi-coated drug-eluting stent for antithrombosis and antirestenosis
First Claim
1. An article of manufacture comprising:
- a stent body comprising a surface; and
a coating comprising at least two layers disposed over at least a portion of the stent body, wherein the at least two layers comprise a first layer disposed over the surface of the stent body and a second layer disposed over the first layer, said first layer comprising a polymer film having a biologically active agent dispersed therein, and the second layer comprising an antithrombogenic heparinized polymer comprising a macromolecule, a hydrophobic material, and heparin bound together by covalent bonds, wherein the hydrophobic material has more than one reactive functional group and under 100 mg/ml water solubility after being combined with the macromolecule.
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Accused Products
Abstract
A stent having a multi-layered coating adhered to its surface which can prevent restenosis and thrombosis at the implant site. The stent coating is comprised of two layers. The first layer is a polymeric coating with one or more biologically active agent(s) dispersed therein. The second layer is comprised of a hydrophobic heparinized polymer that inhibits blood coagulation and provides a hydrophilic surface for reducing the friction between stent and lesion site. In preferred embodiments of the invention, the multi-layered stent is effective in deterring restenosis and thrombosis at the implant site. In these same preferred embodiments, the multi-layered stent is capable of reducing the burst release of the biologically active agents from the first layer and sustaining a release of an effective amount of these agents for a relatively extended period of time. Methods of applying the multi-layered coating to the stent surface are also part of this invention.
220 Citations
29 Claims
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1. An article of manufacture comprising:
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a stent body comprising a surface; and
a coating comprising at least two layers disposed over at least a portion of the stent body, wherein the at least two layers comprise a first layer disposed over the surface of the stent body and a second layer disposed over the first layer, said first layer comprising a polymer film having a biologically active agent dispersed therein, and the second layer comprising an antithrombogenic heparinized polymer comprising a macromolecule, a hydrophobic material, and heparin bound together by covalent bonds, wherein the hydrophobic material has more than one reactive functional group and under 100 mg/ml water solubility after being combined with the macromolecule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An article of manufacture comprising:
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a stent body comprising a surface; and
a coating comprising at least two layers disposed over at least a portion of the stent body, wherein the at least two layers comprise a first layer disposed over the surface of the stent body and a second layer disposed over the first layer, said first layer comprising a polymer film having a biologically active agent dispersed therein, and the second layer comprising an antithrombogenic heparinized polymer comprising a macromolecule, a hydrophobic material, and heparin bound together by covalent bonds, wherein the hydrophobic material has more than one reactive functional group and under 100 mg/ml water solubility after being combined with the macromolecule and the heparin is selected from recombinant heparin, heparin derivatives, and heparin analogues. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification