Noninvasive device for photoelectrically measuring the property

Details Noninvasive device for photoelectrically measuring the property Noninvasive device for photoelectrically measuring the property

1983-02-17

1986-05-06

Howell, Kyle L.

Surgery

Truss

Pad

128666, 356 41, A61B 500, A61B 600

Patent

active

045865132

ABSTRACT:
A noninvasive device for photoelectrically measuring a property of arterial blood is provided. Light that contacts living tissue with arterial blood is converted into a pair of electrical signals. The electrical signals are processed to provide information of the amplitude of the measured signals and are further processed to produce a final output signal that is substantially a square function of a ratio between the electrical signals representative of the amplitudes.

REFERENCES:
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patent: 3998550 (1976-12-01), Konishi et al.
patent: 4086915 (1978-05-01), Kofsky et al.
patent: 4114604 (1978-09-01), Shaw et al.
patent: 4167331 (1979-09-01), Nielsen
patent: 4407290 (1983-10-01), Wilber
patent: 4453218 (1984-06-01), Sperinde et al.
Landsman et al, Pflugers Arch, vol. 373, 1978, pp. 273-282.
"Optical Transmission and Reflection by Blood," by R. J. Zdrojkowski and N. R. Pisharoty.
"Optical Diffusion in Blood," by Curtis C. Johnson.
"New Contributions to the Optics of Intensely Light-Scattering Materials. Part 1," by Paul Kubelka.

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