Method and apparatus for determining hematocrit

Details Method and apparatus for determining hematocrit Method and apparatus for determining hematocrit

1976-09-21

1978-01-10

Rolinec, Rudolph V.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Erosion

235 92PC, 328115, G01N 2700

Patent

active

040681696

ABSTRACT:
An apparatus and method are provided for measuring hematocrit. A diluted blood sample is passed through a well-known conductivity sensor providing a sensor pulse for each sensed blood cell. Each pulse has a peak amplitude corresponding to the size of a blood cell passing through the sensor. During a first time period initiated by passing of the sensor pulse above a threshold level, the sensor pulse is coupled to peak detecting means, and a signal indicative of the level of the peak is generated and stored. The value of each stored signal is added to an integrator for a fixed period of time. The value stored by the integrator is thus indicative of hematocrit level for a known sample volume.

REFERENCES:
patent: 3439267 (1969-04-01), Coulter et al.
patent: 3812425 (1974-05-01), Miller
patent: 3878369 (1975-04-01), Gahwiler
patent: 3890568 (1975-06-01), Coulter et al.
patent: 3921066 (1975-11-01), Angel et al.
patent: 3973189 (1976-08-01), Angel et al.

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