The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 1991
Filed:
Nov. 14, 1988
Masahiko Kanda, Osaka, JP;
Kunio Awazu, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A liver function testing apparatus, provides light signals (11, 12) exposing vital tissue (15) to a first light signal that is substantially absorbed by a specific dye dosed into the blood of the vital tissue. The dye is to be taken in and removed by the liver. A second light signal is substantially not absorbed by the specific dye. Optical pulses obtained from the vital tissue are received by a light receiving element (13), the output of which is sampled by an A-D converter (30) to provide digital output signals. On the basis of variable components in the blood, a CPU (34) determines a coefficient of a regression line expression between first and second photoelectric conversion signals, to perform a biocalibration. A value correlated with a specific dye concentration in the blood, is processed on the basis of sampling signals during a prescribed period after an injection of the specific dye and the determined coefficient of the regression line expression, so that a coefficient of a simulation function is obtained as a function of time using the method of least squares. Additionally, an index RMAX expressing the total amount of hepatic cell function is obtained on the basis of the coefficients.