Blood coagulation time measuring device

Details Blood coagulation time measuring device Blood coagulation time measuring device

1989-03-01

1990-10-23

Arnold, Bruce Y.

Optics: measuring and testing

By inspection with agitation or rotation

Of container contents

422 73, G01N 2159

Patent

active

049647288

ABSTRACT:
A blood coagulation time measuring device includes a stirrer drive arrangnt for rotating a stirring rod placed inside the measuring vessel when the vessel is inserted in a measuring channel of the device. A light detector assembly within the device determines the degree of coagulation formation in the measuring vessel by transmitting a light beam from a light source through the measuring vessel and onto a photo-electric cell. Light balancing circuitry coupled to the light source and the photo-electric cell automatically adjusts the brightness of the light from the light source in correspondence with the turbidity of liquid in the measuring vessel. A control switch arrangement operates to turn the stirrer drive arrangement on or off in response to operation of the light balancing circuitry.

REFERENCES:
patent: 3307392 (1967-03-01), Owen et al.
patent: 3520659 (1970-07-01), Steinberg et al.
patent: 3736431 (1973-05-01), Childs
patent: 3847482 (1974-11-01), Sokol et al.
patent: 3936192 (1976-02-01), Skala
patent: 3989382 (1976-11-01), Kent et al.
patent: 4116564 (1978-09-01), Renaud et al.

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