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Reliable noninvasive measurement of blood gases

  • US 5,630,413 A
  • Filed: 08/12/1994
  • Issued: 05/20/1997
  • Est. Priority Date: 07/06/1992
  • Status: Expired due to Fees
First Claim
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1. A quantitative analysis instrument for noninvasive measurement of two or more blood gas parameters present in blood containing tissue of a human, said instrument comprising:

  • a. a source of at least three different wavelengths of light, said wavelengths being in the range of 500 to 2500 nm;

    b. optics for directing said wavelengths of light into said tissue;

    c. at least one detector for measuring the intensities of at least a portion of said wavelengths of said light emerging from said tissue at, at least, three wavelengths of said light during the systolic and diastolic portions of the cardiac cycle;

    d. electronics for processing said measured intensities to estimate the values at least two of pH, PCO2, and [HCO3- ] and a measure of oxygen saturation in said blood based on the intensity variations of said wavelengths of light due to blood pulsations; and

    e. means for indicating said estimated values of said blood gas parameters.

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