An implantable medical device is adapted for implantation into body tissue. The implantable medical device comprises a housing and a header coupled to the housing. A cavity is located in the header. An ultrasonic transducer adapted to transmit acoustic waves at a communication frequency is located in...http://www.google.co.uk/patents/US7570998?utm_source=gb-gplus-sharePatent US7570998 - Acoustic communication transducer in implantable medical device header
Acoustic communication transducer in implantable medical device header
