Measuring and testing – Vibration
Patent
1988-10-12
1989-08-08
Noland, Tom
Measuring and testing
Vibration
73 24, 210748, G01N 2900
Patent
active
048541702
ABSTRACT:
This invention is an ultrasound apparatus for determining hematocrit. A sample of blood in a microhematocrit capillary tube is acoustically coupled to an ultrasound transducer which creates a standing wave in the blood sample. Red blood cells in the blood sample are packed in bands that correspond to the nodes of the standing wave. The thickness of the bands as a function of the thickness of the remaining plasma is an indication of the hematocrit of the blood sample.
REFERENCES:
patent: 4055491 (1977-10-01), Porath-Furedi
patent: 4280823 (1981-07-01), Szonntagh
patent: 4673512 (1987-06-01), Schram
patent: 4743361 (1988-05-01), Schram
Baker Charles D.
Brimhall Owen D.
Peterson Stephen C.
Riddle Merwyn D.
Arana Louis M.
Noland Tom
Separation Technology, Inc.
Young J. Winslow
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