Optics: measuring and testing – With sample preparation
Patent
1991-11-14
1993-12-28
Heyman, John S.
Optics: measuring and testing
With sample preparation
356 72, 377 10, 324 714, G01N 1510, G01N 3349
Patent
active
052744310
ABSTRACT:
The particle counting apparatus is intended to count the number of particles such as blood corpuscles, by passing through a minute aperture, and detecting the particles electrically. In this particle counting apparatus, the liquid specimen is passed into the minute aperture at a specific flow rate by means of a liquid specimen discharge device, and the particles are counted preliminarily, and the dilution proportion of the liquid specimen is determined when the value of this preceding counting is over a specific value. According to this dilution proportion, the liquid specimen discharge device and diluent discharge device discharge so that the flow rates may be as specified, and the mixture is passed through the minute aperture for main counting. In this way, if there are many particles, simultaneous passes do not occur in the detecting region.
REFERENCES:
patent: 4330745 (1982-05-01), Hayashi
patent: 4522493 (1985-06-01), Tamagawa et al.
patent: 4586190 (1986-04-01), Tsuji
patent: 4653078 (1987-03-01), Aritomi et al.
patent: 4710021 (1987-12-01), von Behrens
patent: 4747685 (1988-05-01), Suzuki
patent: 5194909 (1993-03-01), Tycko
Heyman John S.
TOA Medical Electronics Co., Ltd.
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