An implantable barometric pressure sensor coupled with an implantable medical device (IMD) provides a barometric pressure related, reference pressure value for use in combination with an absolute pressure value measured by an implantable absolute pressure sensor coupled to the IMD. In one embodiment,...http://www.google.com.au/patents/US6234973?utm_source=gb-gplus-sharePatent US6234973 - Implantable medical device for sensing absolute blood pressure and barometric pressure
