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Non-invasive method for the in vivo determination of the oxygen saturation rate of arterial blood, and device for carrying out the method

  • US 5,413,100 A
  • Filed: 01/21/1994
  • Issued: 05/09/1995
  • Est. Priority Date: 07/17/1991
  • Status: Expired due to Fees
First Claim
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1. Method for determining the oxygen saturation rate of the arterial blood of a subject, in which the concentration of oxyhemoglobin or HbO2 is compared with the total concentration of hemoglobin, comprising the steps of providing first, second and third light sources emitting in respective wavelength bands including a near infrared wavelength band, a deep red wavelength band and a wavelength band therebetween, selectively directing light emitted from the respective light sources through an appropriate tissue region of the subject, acquiring representative signals of optical absorption through the tissue region, cyclicly exciting the light sources in succession and determining the frequency of the cyclic succession so as to be large as compared with the arterial pulsation frequency of the subject, and calculating concentrations of HbO2, Hb and HbCO to determine the oxygen saturation rate.

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