Patent ID: 8548543

Claim:
An implantable medical device comprising: a hermetically sealed housing, wherein the hermetically sealed housing comprises one or more sensor openings defined therethrough; an optical sensor configured to generate a signal representative of a physiological condition, wherein the optical sensor comprises: a first optical sensor portion comprising at least one light emitting device and at least one light detecting device, wherein the at least one light emitting device and the at least one light detecting device are configured to emit light through a first optical window located within the one or more sensor openings and to detect light through the first optical window, respectively; a second optical sensor portion comprising at least one light emitting device and at least one light detecting device, wherein the at least one light emitting device and the at least one light detecting device are configured to emit light through a second optical window located within the one or more sensor openings and to detect light through the second optical window, respectively, wherein the at least one light emitting device of the first optical sensor portion is configured to emit light at a first wavelength and the at least one light detecting device of the second optical sensor portion is configured to detect light of the first wavelength, and further wherein the at least one light emitting device of the second optical sensor is configured to emit light of a second wavelength and the at least one light detecting device of the first optical sensor is configured to detect light of the second wavelength; and a control module coupled to the first and second optical sensor portions to control the emission and detection of light through the first and second optical windows.