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Method for spectrophotometric blood oxygenation monitoring

  • US 8,788,004 B2
  • Filed: 12/12/2011
  • Issued: 07/22/2014
  • Est. Priority Date: 07/26/2002
  • Status: Active Grant
First Claim
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1. A method for non-invasively determining an absolute non-pulsatile blood oxygen saturation level within a subject'"'"'s tissue, said method comprising the steps of:

  • providing a sensor having at least one transducer in communication with a processor, the transducer having at least one light source, a first light detector spaced apart from the light source by a first distance, and a second light detector spaced apart from the light source by a second distance, wherein the first distance is less than the second distance;

    transmitting light signals from the light source into the subject'"'"'s tissue, wherein the transmitted light signals include a plurality of wavelengths;

    sensing the light signals using the first light detector and the second light detector, and communicating information representative of the sensed light signals to the processor;

    determining an attenuation of the transmitted light signals for each of the plurality of wavelengths using the processor to process the information representative of the sensed light signals; and

    determining the absolute non-pulsatile blood oxygen saturation level within the subject'"'"'s tissue using the processor, which determining includes determining a difference in attenuation between the plurality of wavelengths.

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