A method and apparatus for arterial reperfusion through non-invasive ultrasonic action transforms supplied energy into ultrasound signals and transmits the ultrasound signals into a body sufficiently to influence the dissolution of thrombus in a blood vessel in the body. A transducer for the transmitting...http://www.google.se/patents/US5713831?utm_source=gb-gplus-sharePatent US5713831 - Method and apparatus for arterial reperfusion through noninvasive ultrasonic action 
