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System for pulse oximetry SPO.sub.2 determination

  • US 5,503,148 A
  • Filed: 11/01/1994
  • Issued: 04/02/1996
  • Est. Priority Date: 11/01/1994
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring oxygen saturation of hemoglobin in arterial blood said apparatus connected to a probe which produces a series of sets of data values, each of said sets including first and second data values, each of said data values in a set being indicative of light absorption of arterial blood, said arterial blood having pulsatile and non-pulsatile components, each of said data values being measured at a respective one of two light wavelengths said apparatus comprising:

  • means for storing a plurality of said sets of data values received from said probe;

    means for computing a ratio of a first effective optical extinction coefficient of said pulsatile component of said arterial blood at a first one of said two light wavelengths to a second effective optical extinction coefficient of said pulsatile component of said arterial blood at a second one of said two light wavelengths, said ratio of effective optical extinction coefficients being determined by two variable least squares processing n of said sets of data values, where n is a positive integer greater than 2, to compensate for noise in said sets of data values at both of said first and second wavelengths; and

    means for determining said oxygen saturation of said hemoglobin using said ratio.

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