Optics: measuring and testing – Blood analysis
Patent
1976-02-05
1978-09-26
McGraw, Vincent P.
Optics: measuring and testing
Blood analysis
356 73, 356184, 356197, 73 641, G01N 2100, G01J 348, G01N 2124
Patent
active
041165640
ABSTRACT:
The apparatus comprises a massive body accurately maintained at 37.degree. and having a through horizontal bore in which are disposed in succession a bulb, a first concentrating lens, a test tube containing the sample, an interchangeable optical filter, a second concentrating lens and a photo-electric cell. The test tube is disposed in a blind vertical bore of the body and it contains a small stirrer bar resting on its bottom and made of a magnetic material. A permanent magnet, adapted to be operatively associated with the stirrer bar is rotated below the body, co-axially to the bar, by an electric motor at one of two accurately controlled speeds. The output of the cell is amplified and applied to one inlet of a differential amplifier the other inlet of which receives the output of a memory wherein the response of the cell has been registered at the beginning of a test. The outlet signal from the differential amplifier starts therefore from zero and may be applied to a usual graphically recording apparatus. For an aggregation test there is used a green filter and the motor is rotated at substantially 1100 rpm, while for a coagulation test the filter is violet and the motor rotates at 100 rpm.
REFERENCES:
patent: 3635678 (1972-01-01), Seitz
patent: 3972614 (1976-08-01), Johanson
patent: 3997272 (1976-12-01), George
patent: 4037972 (1977-07-01), Pross
Renaud Serge
Rubel Jean-Paul
Bovernick Rodney B.
Institut National de la Sante et de la Recherche Medicale Inserm
McGraw Vincent P.
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