This invention provides a sheath for encompassing at least a portion of a stent to locally deliver a drug to an arterial wall or lumen into which the stent has been inserted, comprising a polymer and a drug incorporated within the polymer, the polymer sheath encompassing at least a portion of the stent...http://www.google.ca/patents/US5383928?utm_source=gb-gplus-sharePatent US5383928 - Stent sheath for local drug delivery
