Optics: measuring and testing – Blood analysis
Patent
1991-03-18
1992-08-18
Rosenberger, Richard A.
Optics: measuring and testing
Blood analysis
73570, 73 6163, 73 6149, 356 40, G01N 3348, G01N 3102
Patent
active
051393280
ABSTRACT:
An automatic hematocrit reader wherein a sample of blood in a microhematocrit capillary tube is banded with a standing wave from an ultrasonic transducer. A light source and photocell combination is used to determine the relative thicknesses of the bands of red blood cells and the bands of plasma. The hematocrit of the sample of blood is electronically calculated from this data. A calibration strip is included so that the device is calibrated each time the hematocrit is determined. The device includes a mechanical interlock/eject system for the microhematocrit capillary tube and is specifically configured so that the operator does not handle or even touch the microhematocrit capillary tube.
REFERENCES:
patent: 3561877 (1971-02-01), Nakada et al.
patent: 4609991 (1986-09-01), Minton et al.
patent: 4848900 (1989-07-01), Kuo et al.
patent: 4854170 (1989-08-01), Brimhall et al.
patent: 4887458 (1989-12-01), Baker et al.
Baker Charles D.
Brimhall Owen D.
McLaughlin Thomas J.
Pham Hoa
Rosenberger Richard A.
Separation Technology, Inc.
Young J. Winslow
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