Low leakage current medical instrument

Details Low leakage current medical instrument Low leakage current medical instrument

1976-11-19

1979-05-22

Spear, Jr., Frank A.

Liquid purification or separation

With heater or heat exchanger

For filter

128908, 210321B, B01D 3100

Patent

active

041558529

ABSTRACT:
A medical instrument, specifically shown as a dialysis machine, incorporates an electrically isolated and hermetically sealed high thermal flux heater in conjunction with means for vectorially cancelling alternating current signal components generated in the operation of the machine. Because of electrical coupling between the medical instrument and a human patient blood stream, large ground leakage currents can result in electrical shock for a patient if the ground wire of the machine becomes open circuited. However, the combination of a specially modified dialysate fluid heater with an extremely large and dependable isolation resistance and operating mode dependent vectorial compensation for resistive and capacitive leakage current permits total leakage current from chassis to ground to be brought below a hitherto unattainable 1 microamp level.

REFERENCES:
patent: 3352779 (1967-11-01), Austin et al.
patent: 3513540 (1970-05-01), Boggs
patent: 3573551 (1971-04-01), Sircom
patent: 3670206 (1972-06-01), Sircom
patent: 3722680 (1973-03-01), Smith
patent: 3757169 (1973-09-01), Beresnikow
patent: 3946738 (1976-03-01), Hewton et al.

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