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Absolute calibrated tissue oxygen saturation and total hemoglobin volume fraction

  • US 8,463,346 B2
  • Filed: 06/10/2010
  • Issued: 06/11/2013
  • Est. Priority Date: 06/10/2009
  • Status: Active Grant
First Claim
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1. A method for monitoring a patient condition in a medical device having an optical sensor, the method comprising:

  • advancing the sensor intravascularly to position the sensor along a volume of tissue;

    positioning the sensor along a renal vein, the volume of tissue comprising kidney tissue;

    controlling the optical sensor to emit light comprising at least four spaced-apart light wavelengths;

    detecting light scattered by the volume of tissue, wherein detecting light comprises measuring an optical sensor output signal corresponding to an intensity of the scattered light;

    computing a measure of tissue oxygenation in response to the detected light; and

    detecting hypoxia in the kidney tissue in response to the measurement of tissue oxygenation.

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