Ultrasound delivery catheters comprising elongate flexible catheter bodies having rigid distal tip or head members inserted into, and affixed thereto. At least one ultrasound transmission member extends longitudinally through the catheter body and is coupled to the distal tip or head member. Additionally,...http://www.google.de/patents/US5542917?utm_source=gb-gplus-sharePatent US5542917 - Ultrasound delivery catheters incorporating improved distal tip construction
