An acoustic transducer includes a support structure which holds an acoustic pulse generator having both a front application face and a rear face. An acoustic absorber is attached to the rear face of the pulse generator. An acoustic isolator is positioned between the acoustic absorber and a support structure/heat...http://www.google.es/patents/US5629906?utm_source=gb-gplus-sharePatente US5629906 - Ultrasonic transducer
