×

Method and an apparatus for determining blood components

  • US 4,997,769 A
  • Filed: 04/13/1990
  • Issued: 03/05/1991
  • Est. Priority Date: 06/21/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for spectrophotometrically determining the concentration of a number of hemoglobin derivatives comprising at least deoxyhemoglobin and oxyhemoglobin or parameters derived from the concentration of individual hemoglobin derivatives, including the oxygen saturation fraction, in whole blood, comprisingtransmitting light to the blood under test,determining the modification caused by the blood on the light transmitted to the blood at a number of individual wavelengths, wherein one of the individual wavelengths is above 535 nm and is a wavelength at which the ratio between absorption due to turbidity and absorption due to hemoglobin derivative is relatively high, anddetermining the concentrations or the derived parameters on the basis of the light modification at the individual wavelengths and on the basis of predetermined coefficients representing the light absorption characteristics of each of the hemoglobin derivatives at each of the individual wavelengths, any error on the determination values due to turbidity being substantially compensated for by utilizing predetermined coefficients representing an absorption characteristic of turbidity at each of the individual wavelengths.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×