Electrode isolation amplifier

Details Electrode isolation amplifier Electrode isolation amplifier

1989-11-08

1992-03-31

Pellegrino, Stephen C.

Surgery

Truss

Pad

128746, 128419R, A61B 504

Patent

active

050998560

ABSTRACT:
A system for detecting and transmitting body electrical signals in the presence of ambient electrical interference that uses a transmiter circuit including an amplifier coupled to and in close proximity to two or more body electrodes, a light pulse generator that receives its input from that amplifier and provides a pulse-duration-modulated series of light pulses, and a remote receiver including a transducer which demodulates the transmitted light pulses into electrical pulses of corresponding duration and frequency and a demodulator which accepts those electrical pulses and produces an amplified replica of the original signal developed between the body electrodes, thereby effectively providing complete electrical isolation of the electrode amplifier from the remaining bioelectrical signal analysis equipment. A valuable additional feature of the invention is a complete electrostatic shield around the amplifier-transmitter as well as the electode leads, so that the small amount of residual capacitive coupling to the amplifier circuit itself is effectively shunted to the same average (body) potential as that of the electrodes.

REFERENCES:
patent: 3794841 (1974-02-01), Cosentino et al.
patent: 3896274 (1975-07-01), Fraim et al.
patent: 4037586 (1977-07-01), Grichnik
patent: 4539441 (1985-09-01), Eggert et al.
patent: 4566464 (1986-01-01), Piccone et al.
patent: 4679002 (1987-07-01), Sherwin et al.
patent: 4689819 (1987-08-01), Killion
patent: 4709702 (1987-12-01), Sherwin
patent: 4784144 (1988-01-01), Ono et al.
patent: 4967038 (1990-10-01), Gevins et al.
"Electrical Safety in Hospitals-Reduction of Leakage Currents by use of a Double Screened Mains Transformer", J. Pontoppidan et al., Bio-Med Eng. (GB), vol. 9, No. 1, Jan. 1974, 21-23.

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