Patent ID: 9415193
Filing Date: 2016-08-16
CPC Classification: A61L,A61M,F04C

Claim Text:
1. A medical device comprising: a. an expandable member; b. a hydrophilic coating comprising a therapeutic agent disposed around said expandable member; c. a sheath disposed around said coating, wherein said sheath comprises an ePTFE material having a variably permeable microstructure comprised of nodes interconnected by fibrils, and wherein the microstructure is configured to be substantially closed when the sheath is not under a strain so as to limit unintended transfer of therapeutic agent through said sheath; d. wherein said sheath includes a wetting agent; and e. wherein the microstructure is further configured such that when said expandable member and sheath are expanded, said sheath has an open microstructure sufficient to allow fluid external to said sheath to flow through said sheath and contact said therapeutic agent.