Method and apparatus for detecting occurrence of clogging condit

Details Method and apparatus for detecting occurrence of clogging condit Method and apparatus for detecting occurrence of clogging condit

1985-04-09

1987-03-24

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Counting animate or inanimate entities

324 714, G01N 2700

Patent

active

046530789

ABSTRACT:
A method of counting red blood cells suspended in a blood sample is disclosed which can judge the presence or absence of clogging in the sample passage system of a blood cell counting apparatus. In this method, for example, the counting of red blood cells for a period of 200 msec is repeated 50 times, the means value X and standard deviation SD of 50 red blood cell counts each indicating the number of red blood cells per unit time (equal to 200 msec) are calculated, and when one of the red blood cell counts deviates from the mean value X by more than 3SD, such deviation is judged to presage clogging in the sample passage system. Further, each of the red blood cell counts can be displayed on the fluorescent screen of a CRT display.

REFERENCES:
patent: 3259842 (1966-07-01), Coulter et al.
patent: 3768084 (1973-10-01), Haynes
patent: 3921066 (1975-11-01), Angel et al.
patent: 3973194 (1976-08-01), McMorris et al.

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