Apparatus and methods are disclosed for inserting electrical leads within a heart. A method is provided for positioning a medical electrical lead in a cardiac vein. The method comprises inserting a lead within a coronary sinus, dispersing at least one vasodilating agent to dilate at least one cardiac...http://www.google.es/patents/US7657323?utm_source=gb-gplus-sharePatente US7657323 - Endovenous device for dispersing a dilating agent
