Surgery – Truss – Pad
Patent
1996-03-29
1998-02-24
Bahr, Jennifer
Surgery
Truss
Pad
A61B 500
Patent
active
057202842
ABSTRACT:
Light of various wavelengths emitted from light sources and transmitted through vital tissues is converted by light sensors and current/voltage transducers, into electric signals. The signals are converted into digital values by an A/D converter. The light source emits light of a wavelength which can be optically absorbed by water. A computer obtains a ratio of variations of the digital values for each wavelength, and calculates the values of tissue terms and the hemoglobin concentration on the basis of the ratios. In the calculation, since tissue terms of the wavelengths have mutual constant relationships, an equation which is prepared so that there exists only one unknown in the tissue terms is used.
REFERENCES:
patent: 5101825 (1992-04-01), Gravenstein et al.
patent: 5277181 (1994-01-01), Mendelson et al.
patent: 5372136 (1994-12-01), Steuer et al.
"Theoretical and Experimental Study on Optical Density of Blood", Japanese Journal of Medical Electronics and Biological Engineering, vol. 30, No. 1 pp. 1-7.
Aoyagi Takuo
Fuse Masayoshi
Kanemoto Michio
Xie Cheng Tai
Bahr Jennifer
Nihon Kohden Corporation
Winakur Eric F.
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