Patent ID: 7095491

Claim:
Method for controlling a device for measuring quantitative proportions of blood constituents, in which electromagnetic radiation of different radiation frequencies is passed through a blood-containing vessel, and at least a portion of the radiation exiting the vessel is detected by sensors and fed to an evaluating device, wherein at least two radiation detection sensors ( 2 , 3 , 4 ) are positioned a certain distance apart and that the evaluating device is assigned a calibration characteristic curve, which is determined by an individual calibration measurement, in which at least one constant is used as the calibration criterion and is determined from at least one measurement variable ( 22 ) detected by the sensors ( 2 , 3 , 4 ), wherein during the measuring procedure a standard calibration function ( 13 ) is combined with a scattering determination ( 14 ) and the results of the standard calibration function ( 13 ) as well as the output value of the scattering determination ( 14 ) are combined with each other by a combiner ( 16 ) according to an algorithm preset as an individual calibration function, an output value of the comparator ( 16 ) is combined with a measurement variable ( 17 ) and the combination of the output value of the combiner ( 16 ) and the measurement variable ( 17 ) yields the respective target quantity ( 18 ).