A method for focussing vibrational energy upon a target volume within a surrounding contiguous medium imparts high intensity energy upon the target volume from low level energy sources. A plurality of standing compression waves are established within the medium along corresponding longitudinal...http://www.google.com.au/patents/US5725482?utm_source=gb-gplus-sharePatent US5725482 - Method for applying high-intensity ultrasonic waves to a target volume within a human or animal body 
