Patent ID: 8262613

Claim:
A medical device, comprising: a balloon that is expandable from an unexpanded state to an expanded state; an elastic sheath over said balloon, said elastic sheath being expandable from an unexpanded state to an expanded state and having at least one slit therein, said slit having a first side and a second side, wherein said first side and said second side are substantially closed in the unexpanded state, and said first side and said second side pull away from each other in the expanded state; and a drug agent carried by the medical device such that when said at least one slit is substantially closed, said drug agent is substantially retained by the elastic sheath, wherein when said balloon is in the unexpanded state, said elastic sheath is in the unexpanded state, and when said balloon is expanded to the expanded state, said elastic sheath is expanded to the expanded state and said at least one slit is substantially open such that said drug agent is delivered from said medical device.