Patent ID: 7819914

Claim:
An implantable medical device comprising: a substantially cylindrical intraluminal scaffold which is expandable from a first diameter for delivery into a vessel, to a second diameter for expanding the vessel, the intraluminal scaffold having a luminal surface and an abluminal surface, the distance between the luminal surface and the abluminal surface defining the wall thickness of the intraluminal scaffold, the intraluminal scaffold also including a plurality of openings extending from the luminal to abluminal surface; a primer layer including multiple layers, the primer layer covering the luminal surface, the abluminal surface and the surfaces of the plurality of the openings; a first coating comprising a material having a first electric charge affixed to the primer layer; a second coating comprising a material having a second electric charge affixed to the first coating only in the plurality of openings, the second electric charge being opposite of the first electric charge; and at least one therapeutic agent deposited in at least one of the plurality of openings, wherein the second coating is configured as an intermediate layer between the first coating and the at least one therapeutic agent.