Phase-separated polymer coatings
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Abstract
The present invention includes a drug release system. The drug release system comprises a bulk polymer phase and a polymeric drug-enriched phase within the bulk polymer phase. At least one, drug is incorporated into the drug-enriched phase.
245 Citations
85 Claims
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1-43. -43. (canceled)
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44. a drug-delivery stent comprising a coating, wherein the coating includes:
a first-polymer phase comprising a first-polymer, a second-polymer phase comprising a second-polymer, and a drug;
wherein, the second-polymer phase is substantially or completely immiscible in the first-polymer phase, and the drug is preferentially incorporated in the second-polymer phase.- View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A method of coating a stent comprising incorporating a drug preferentially in a second-polymer phase during a coating process, wherein the coating process comprises:
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forming a coating composition comprising a first polymer for a first polymer phase, a second polymer for a second polymer phase, a drug, and a solvent;
wherein the second polymer is substantially or completely immiscible in the first polymer;
applying the composition to a stent; and
removing the solvent from the composition to form a coating including the first-polymer phase, the second-polymer phase, and the drug, wherein the drug is preferentially in the second-polymer phase. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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71. A drug-delivery stent comprising a coating, wherein the coating includes:
a first-polymer phase comprising a first-polymer, a second-polymer phase comprising a second-polymer, and a drug;
wherein, the second-polymer phase is partially or substantially phase-separated from the first-polymer phase, and the drug is preferentially incorporated in the second-polymer phase.
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72. A method of coating a stent comprising incorporating a drug preferentially in a second-polymer phase during a coating process, wherein the coating process comprises:
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forming a coating composition comprising a first polymer for a first-polymer phase, a second polymer for a second-polymer phase, a drug, and a solvent;
applying the composition to a stent; and
removing the solvent from the composition to form a coating with the drug preferentially in the second-polymer phase, wherein the second-polymer phase is partially or substantially phase-separated from a first-polymer phase.
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73. A therapeutic composition for coating stents comprising:
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a first polymer component;
a second polymer component, wherein the second polymer component at least partially separates from the first polymer component when a coating is formed from the composition; and
a drug being preferentially enriched in the second polymer component when the coating is formed from the composition. - View Dependent Claims (74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85)
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Specification