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Optical sensor and method for detecting a patient condition

  • US 8,260,415 B2
  • Filed: 12/21/2007
  • Issued: 09/04/2012
  • Est. Priority Date: 12/21/2007
  • Status: Active Grant
First Claim
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1. An implantable medical device for monitoring blood flow pulsatility in a volume of body tissue in a patient, the device comprising:

  • at least two electrodes for sensing cardiac electrical signals;

    a light source for emitting a light signal, anda light detector for receiving the light signal emitted by the light source and scattered by the volume of body tissue, the light detector emitting a signal correlated to the received light signal, the light detector signal having an alternating current component correlated to pulsatility of blood flow within the volume of body tissue; and

    a processor configured to receive the cardiac electrical signals, sense events as R-wave events from the cardiac electrical signals, gate the light detector signal for monitoring the alternating current component at a time delay following a sensed R-wave event, receive the gated light detector signal, determine a patient condition in response to the alternating current component of the gated light detector signal, and detect T-wave oversensing in response to the gated light detector signal.

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