A catheter comprises a catheter body having a bending plate transducer disposed at or near its distal end. The bending plate transducer is typically a unimorph, bimorph, or other conventional vibratory transducer capable of imparting pressure waves in a direction generally normal to the plane of the...http://www.google.se/patents/US5931805?utm_source=gb-gplus-sharePatent US5931805 - Catheters comprising bending transducers and methods for their use
