An electromechanical transducer device includes a casing having a distal end and a proximal end, and an acoustic wave generator disposed inside the casing for generating an acoustic type vibration in response to an electrical signal. The acoustic wave generator having an axis extending between the proximal...http://www.google.se/patents/US5465468?utm_source=gb-gplus-sharePatent US5465468 - Method of making an electromechanical transducer device
