Stents with hybrid coating for medical devices
First Claim
1. A stent comprising:
- a substantially tubular body;
a first coating disposed over said body, said first coating including a polymeric material, a first therapeutic agent admixed in said polymeric material, and a crosslinking agent; and
a second coating disposed over said first coating including a second therapeutic agent, wherein said crosslinking agent binds said second therapeutic agent to said polymeric material.
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Accused Products
Abstract
A device such as a stent is provided with a hybrid coating including a time released, restenosis inhibiting coating and a non-thrombogenic coating to prevent clotting on the device. One first coat or layer includes a polymer, a crosslinking agent, and pacitaxel, analogues, or derivatives thereof. The first coat preferably includes a polymer having Taxol admixed therein so as to be releasable over time. The first coat preferably includes a polyfunctional aziridine as the crosslinking agent. The second coat preferably includes heparin to inhibit clot formation on the device. The crosslinking agent can covalently bond to both the first coat polymer and the second coat heparin. A stent can be provided with a first coat including an aqueous dispersion or emulsion of a polymer and an excess of crosslinking agent. The first coating can be dried, leaving a water insoluble polymer coating. A second aqueous coating including a solution or dispersion of heparin can be applied over the first coating, the heparin becoming covalently bound to the crosslinking agent on the first coating surface. The resulting stent can inhibit restenosis while preventing blood clot formation on the stent.
801 Citations
16 Claims
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1. A stent comprising:
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a substantially tubular body;
a first coating disposed over said body, said first coating including a polymeric material, a first therapeutic agent admixed in said polymeric material, and a crosslinking agent; and
a second coating disposed over said first coating including a second therapeutic agent, wherein said crosslinking agent binds said second therapeutic agent to said polymeric material. - View Dependent Claims (2, 3, 4, 5)
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6. A stent comprising:
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a substantially tubular body;
means for inhibiting restenosis;
means for adhering said restenosis inhibiting means to said stent body and releasing said restenosis inhibiting means from said stent body over time; and
means for rendering said stent body non-thrombogenic.
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7. A stent comprising:
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a substantially tubular body;
a polymer having organic acid functional groups;
a first coating layer including a first therapeutic agent admixed with said polymer and a polyfunctional crosslinking agent covalently bonded to said polymer organic acid functional groups; and
a second coating layer disposed over said first coating layer including a second therapeutic agent covalently bonded to said polyfunctional crosslinking agent. - View Dependent Claims (8, 9, 10, 11)
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12. A method for providing a substrate with a biocompatible and restenosis inhibiting coating comprising the steps of:
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coating said substrate with a first aqueous coating composition including a polymer having organic acid functional groups, a first therapeutic agent, an excess of a polyfunctional crosslinking agent having functional groups capable of reacting with organic acid groups;
drying said first coating composition to obtain a substantially water insoluble coating layer still including functional groups being reactive with organic acid groups;
forming a non-thrombogenic surface over said first coating composition by contacting said dried first coating composition with a second aqueous coating composition including heparin; and
drying said second coating, to bond said heparin to said excess crosslinking agent. - View Dependent Claims (13, 14, 15, 16)
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Specification