Method and apparatus for detecting boundary surface between bloo

Details Method and apparatus for detecting boundary surface between bloo Method and apparatus for detecting boundary surface between bloo

1982-07-27

1984-12-11

Turk, Arnold

Chemistry: analytical and immunological testing

Process or composition for determination of physical state...

7386301, 7386321, 204403, 324 65R, 422 68, 422101, 436 63, 436150, 436177, G01N 2702, G01N 3348

Patent

active

044878362

ABSTRACT:
A method and an apparatus for detecting a boundary surface between a blood plasma and a blood corpuscle suspension obtained after centrifuging are disclosed. An impedance across a pair of electrodes is measured by applying an A.C. voltage across the electrodes at such a frequency that impedances of the blood plasma and the blood corpuscle suspension are made greatly different from each other. When the impedance changes abruptly, it is determined that the electrodes have passed through the boundary surface.

REFERENCES:
patent: 3635094 (1972-01-01), Oberli
patent: 4055799 (1977-10-01), Coster et al.
patent: 4343782 (1983-08-01), Shapiro
patent: 4368423 (1983-01-01), Liburdy

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