An implantable medical device, such as a stent or graft, having asperities on a designated region of its outer surface is disclosed. The asperities can serve to improve retention of one or more layers of a coating on the device and to increase the amount of coating that can be carried by the device....http://www.google.se/patents/US20050033412?utm_source=gb-gplus-sharePatent US20050033412 - Method of making an implantable medical device
