A stent that is adapted for introduction into a body passageway and which releases at least one biological agent after being inserted in the body passageway. The release of the at least one biological agent can be a controlled release via molecular diffusion through a non-porous polymer layer. ...http://www.google.co.uk/patents/US20060136051?utm_source=gb-gplus-sharePatent US20060136051 - Coated medical device
