Patent ID: 7875285

Claim:
A coating for an implantable medical device, the coating comprising a first region comprising a polymer and a drug incorporated therein and a second region disposed over the first region, wherein the second region comprises a polymer and a material having a melting temperature within the range between about 32° C. and 40° C. for modifying the rate of release of the drug, the polymer in the second region having in a dry state a glass transition temperature within a range of about 35° C. and about 50° C., wherein the polymer in the second region in the dry state contains less than about 1 mass % of water, and wherein when the body temperature of a patient in which the implantable medical device comprising the coating is implanted rises to a temperature above the patient's normal body temperature, the morphology of the coating changes so as to change the release rate of the drug in the coating.