Microprocessor-controlled apparatus and method for detecting the

Details Microprocessor-controlled apparatus and method for detecting the Microprocessor-controlled apparatus and method for detecting the

1991-05-20

1992-10-13

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Gelling or coagulation

422 73, G01N 3349

Patent

active

051540827

ABSTRACT:
Apparatus and method for detecting the coagulation of a sample of blood includes a ferromagnetic member, which is immersed in the blood sample and which is magnetically coupled to a reed switch, and an adjustable source of magnetic flux lines, which is also magnetically coupled to the reed switch. As the blood sample coagulates, the ferromagnetic member is displaced from the reed switch and, as a result, the magnetic field coupled to reed switch is reduced. When the ferromagnetic member reaches a predetermined displacement, the reed switch is open, which indicates that blood has coagulated. A microprocessor calibrates the reed switch by adjusting the density of the magnetic flux lines from the adjustable source such that the reed switch is open when the ferromagnetic member reaches the predetermined distance displacement.

REFERENCES:
patent: 3695842 (1972-10-01), Mintz
patent: 3836333 (1974-09-01), Mintz

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