The present invention comprises apparatus and methods for maintaining patency in body passages subject to occlusion by invasive tissue growth. The apparatus and methods of the present invention may be used to open and maintain patency in virtually any hollow body passage which may be subject to occlusion...http://www.google.se/patents/US6179824?utm_source=gb-gplus-sharePatent US6179824 - System and methods for electrosurgical restenosis of body lumens
