Patent ID: 8177743

Claim:
A medical device, comprising: a balloon that is expandable from a compressed state to an expanded state; a coating on said balloon, said coating comprising a polymer selected from the group consisting of polycarboxylic acids, cellulosic polymers, gelatin, polyvinylpyrrolidone, maleic anhydride polymers, polyamides, polyvinyl alcohols, polyethylene oxides, glycosaminoglycans, polysaccharides, polyesters, polyacrylamides, polyethers, polyurethane dispersions, acrylic latex dispersions, and mixtures and copolymers thereof, said coating having a drug agent incorporated therein, wherein said coating with said drug agent incorporated therein is on said balloon in said compressed state; and an elastic sheath over said coating, said elastic sheath being expandable from a compressed state to an expanded state and having at least one perforation therein; wherein when said balloon is in a compressed state, said elastic sheath is in a compressed state and said at least one perforation is substantially closed such that said drug agent does not pass through said at least one perforation; and wherein when said balloon is in an expanded state, said elastic sheath is in an expanded state and said at least one perforation is substantially open such that said drug agent passes through said at least one perforation.