Coupling circuit with driven guard

Details Coupling circuit with driven guard Coupling circuit with driven guard

1978-09-07

1980-04-29

Kamm, William E.

Surgery

Truss

Pad

128908, A61B 504

Patent

active

042001099

ABSTRACT:
In signal measurement circuits which are referred to a floating ground and which derive their input signals from electrodes attached to a patient's body, the effects of common mode potentials on the patient's body are minimized without requiring any patient electrodes other than those acting as signal sources, by using an operational amplifier to drive the floating ground toward the common mode potential on the patient's body.
This process is accomplished without significantly degrading the isolation impedance between the measurement circuits and true ground.
The patient is protected from hazardous electrical shock by incorporating a current limiting impedance in the amplifier circuit.

REFERENCES:
patent: 3690313 (1972-09-01), Weppner et al.
patent: 3757778 (1973-09-01), Graham
patent: 3868948 (1975-03-01), Graetz
patent: 3915154 (1975-10-01), Cosentinc
patent: 4023565 (1977-05-01), Ohlsson

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