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Physiological parameter confidence measure

  • US 8,718,735 B2
  • Filed: 06/03/2011
  • Issued: 05/06/2014
  • Est. Priority Date: 03/01/2005
  • Status: Active Grant
First Claim
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1. A method of determining a measure of confidence in a physiological parameter, the physiological parameter determined by transmitting multiple wavelengths of optical radiation into a tissue site and detecting the optical radiation after tissue attenuation, the method comprising:

  • deriving physiological data responsive to the intensity of three or more wavelengths of optical radiation transmitted into a tissue site and detected after tissue attenuation;

    estimating a physiological parameter based upon the physiological data;

    providing a plurality of data sets, each of the data sets based on related predetermined physiological data at the three or more wavelengths;

    selecting at least one data set from the plurality of data sets based on the estimated physiological parameter; and

    determining a measure of confidence in the estimated physiological parameter based upon the selected at least one data set and the derived physiological data.

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