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Infrared optical measurement of blood gas concentrations and fiber optic catheter

  • US 4,509,522 A
  • Filed: 12/15/1981
  • Issued: 04/09/1985
  • Est. Priority Date: 12/15/1981
  • Status: Expired due to Fees
First Claim
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1. A method of determining the absolute concentrations of CO, CO2 and O2 in blood comprising the steps of:

  • selectively passing infrared light of near 5.13 μ

    m, 4.3 μ

    m and 9.0 μ

    m through a dimension of blood and measuring magnitudes of transmission at absorption peak wavelengths near 5.13 μ

    m, 4.3 μ

    m and 9.0 μ

    m, corresponding to CO, CO2, and O2, respectively;

    comparing said respective transmissions to transmissions through like dimension reference samples of blood whose blood gas concentrations are known;

    determining the absolute concentrations of CO, CO2, and O2, biased on the comparison of transmission through the blood dimension at these wavelengths to transmission through the reference blood samples having known concentrations of CO, CO2, and O2.

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