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Measuring process for blood gas analysis sensors

  • US 5,922,607 A
  • Filed: 12/11/1996
  • Issued: 07/13/1999
  • Est. Priority Date: 12/13/1995
  • Status: Expired due to Term
First Claim
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1. A method of determining the level of oxygenation of arterial blood SaO2 in tissue in vivo considering optical tissue properties by pulse oximetry, comprising the steps of:

  • a) emitting light through said tissue at a plurality of wavelengths at different instants of time, and different resultant blood flow;

    b) measuring said light received passing through said tissue at said plurality of wavelengths at said instants of time;

    c) calculating a plurality of ratios of differential attenuation vs. time, Ω

    i which can be calculated as ##EQU3## for each wavelength pair i=a,b of different frequencies;

    d) calculating at least one attenuation ratio LAj through said tissue for at least one wavelength where LAj can be calculated as;

    LAj =ln (light intensity received/light intensity emitted);

    e) obtaining calibration data of SaO2 v. Ω

    i for at least one frequency for each said LAj ;

    f) computing the level of oxygenation depending by comparing measured data with the calibration data.

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