Systems and methods for communicating with an implant within a patient's body using acoustic telemetry includes an external communications device attachable to the patient's skin. The device includes an acoustic transducer for transmitting acoustic signals into the patient's body and/or for receiving...http://www.google.com.au/patents/US7617001?utm_source=gb-gplus-sharePatent US7617001 - Systems and method for communicating with implantable devices
