Apparatus for determining the concentration of light-absorbing m

Details Apparatus for determining the concentration of light-absorbing m Apparatus for determining the concentration of light-absorbing m

1995-04-27

1998-06-16

Bahr, Jennifer

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

600322, A61B 5000

Patent

active

057661251

ABSTRACT:
Light beams of different wavelengths, emitted from a light generating device, are transmitted through a living tissue. The transmitted light beams are converted into electrical signals by a photoelectric transducing device. A pulsation calculating device calculates a pulsation of an absorbance of tissue of a living tissue for each wavelength on the basis of the output signal of the photoelectric transducing device. By using this, a pulsation ratio calculating device calculates the ratio of the pulsations of the absorbance values. A concentration calculating device puts the output signal of the pulsation ratio calculating device into a formula having a single unknown on the tissue term, which is constructed on the basis of the fact that a predetermined relation is present between the tissue terms of the respective wavelengths, thereby calculating a value of the tissue term and the concentration of light absorbing material in blood.

REFERENCES:
patent: 4714341 (1987-12-01), Hamaguri et al.
patent: 5028787 (1991-07-01), Rosenthal et al.
patent: 5127406 (1992-07-01), Yamaguchi
patent: 5560355 (1996-10-01), Merchant et al.
"Theoretical and Experimental Study of Optical Attenuation of Blood," Takuo Aoyagi, revised Oct. 14, 1991, R&D Center, Nihon Kohden Corporation.

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