J. T. Baker Chemical Company

General Science Corporation

Robert Baxter, Jr

Frank J Antoci

William J Tynes, Iii

George F Martin

Pasquale M Petrucci

A system is provided for the automatic measurement of red and white blood cell counts and other blood parameters. The system includes hydraulic apparatus for the aspiration of a blood sample and the proper measurement of the parameters thereof. During operation, the system directs an operator at each step of the procedure, allowing only permitted functions to be performed, thereby decreasing the opportunity for operator error. Each blood cell count is performed twice and the answers compared, an indication of instrument malfunction being presented to the operator if the measurements do not agree within a predetermined percentage. The system monitors itself to detect malfunctions which may occur and alerts the operator to the occurrence of a malfunction.

Automatic blood analyzing system

Circuitry for the correction of error occasioned during the counting of platelets in a hematology system. A coincidence corrected platelet count is provided as an input to a rate counter which provides a plurality of output signals representative of different percentages of the input count. A read-only memory is employed to store data representing correction factors for different hematocrit values. Gating circuitry is enabled by output signals from the read-only memory representing a selected hematocrit correction factor, the enabled gate circuits providing pulses representative of selected percentages of the input count and which are combined to provide an output pulse train which is the corrected platelet count.

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Stratford, CT, United States of America

Robert Baxter, Jr