Liver function testing apparatus

Details Liver function testing apparatus Liver function testing apparatus

A - Human Necessities

61

B

354/22, 73/55

A61B 5/00 (2006.01)

Patent

CA 1328018

ABSTRACT OF THE DISCLOSURE In a liver function testing apparatus, light sources (11, 12) expose vital tissue (15) to first light of a wavelength absorbed by a specific dye dosed into blood of the vital tissue to be taken in and removed by the liver and second light of a wavelength not absorbed by the specific dye. Optical pulses obtained from the vital tissue are received by a light receiving element (13), the receiving output of which is sampled by an A-D converter (30) to be converted into digital signals. On the basis of variable components in the blood, a CPU (34) decides a coefficient of a regression line expression between first and second photoelectric conversion signals, to perform biocalibration. A value correlated with specific dye concentration in the blood is operated on the basis of sampling signals during a prescribed period after injection of the specific dye and the decided coefficient of the regression line expression, so that a coefficient of a simulation function as a function of time is obtained by using the method of least squares and an index RMAX expressing the total amount of hepatic cell function is obtained on the basis of the obtained coefficient. - 43 -

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