With abluminal side of a stent masked, the luminal side of the stent is selectively coated with a substance, such as an anti-coagulant, a platelet inhibitor and/or a pro-healing substance. The stent can be masked by inserting it into a rigid mandrel chamber or by compressing a masking sleeve onto the...http://www.google.com/patents/US7867547?utm_source=gb-gplus-sharePatent US7867547 - Selectively coating luminal surfaces of stents
