Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-05-18
1991-11-19
Westin, Edward P.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356 41, 128633, G01J 100
Patent
active
050668595
ABSTRACT:
An improved blood analyzing device is disclosed for measuring the hematocrit and oxygen saturation levels of a quantity of blood. The device comprises a housing having a carriage assembly electrically interfaced thereto. Disposed within the carriage assembly is a light emitting means and a plurality of light detecting optical sensors which are used to provide hematocrit and oxygen saturation signals based on the scattering of light within a blood containment vessel disposed within the carriage. Signals generated from the sensors are processed by control electronics disposed within the housing so as to output a hematocrit measurement which is compensated for the effects of oxygen saturation, pH, and temperature, and an oxygen saturation measurement which is compensated for the effects of hematocrit, pH, and temperature.
REFERENCES:
patent: 4304488 (1981-12-01), Asakura et al.
patent: 4444498 (1984-04-01), Heinemann
patent: 4447150 (1985-05-01), Heinemann
patent: 4745279 (1988-05-01), Karkar et al.
patent: 4776340 (1988-10-01), Moran et al.
An article from IEEE Transactions on Biomedical Engineering, "A Miniature Hybrid Reflection Type Optical Sensor for Measurement of Hemoglobin Content and Oxygen Saturation of Whole Blood", Mar. 1988.
An article from IEEE Transactions on Biomedical Engineering, "Role of Light Scattering in Whole Blood Oximetry", Mar. 1986.
An article from Medical & Biological Engineering & Computing, "Back-Scattering of Light by Red Cell Suspensions", 1979 issue.
Karkar Maurice N.
Velnosky James C.
Beyer James E.
Westin Edward P.
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