Patent ID: 8271093

Claim:
A system for deriving relative physiologic measurement values, comprising: an implantable medical device (“IMD”) operable to determine an absolute physiologic parameter value within a patient's body and communicate the absolute physiologic parameter value outside the patient's body, the IMD including a main body and a remote sensor system adapted to be implanted in the patient's body, the main body including a receiver in acoustic communication with the remote sensor system, the remote sensor system operable to measure an absolute physiologic parameter value within the patient's body and including a transmitter adapted to acoustically communicate the absolute physiologic parameter value to the receiver; an external computing device including communication circuitry configured to wirelessly receive the absolute physiologic parameter value and an integral sensor configured to sense an ambient condition value outside the patient's body, the external computing device comprising a single device operable to both: wirelessly receive the absolute physiologic parameter value from the IMD; and sense an ambient condition value outside the patient's body related to the absolute physiologic parameter value; the external computing device or a backend computing system operable to: calculate a relative physiologic parameter value from the ambient condition value and the absolute physiologic parameter value; and store the calculated relative physiologic parameter value.