An implantable medical device (IMD) is adapted for detecting acoustic chest sounds. The IMD includes a pulse generator having a compartment, the compartment defining an isolated cavity bounded by a back wall. A diaphragm is disposed over and encloses the cavity. An acoustic sensor adapted to sense chest...http://www.google.com/patents/US20070049977?utm_source=gb-gplus-sharePatent US20070049977 - Broadband acoustic sensor for an implantable medical device
