Selection and isolation apparatus for use with ECG device

Details Selection and isolation apparatus for use with ECG device Selection and isolation apparatus for use with ECG device

1985-11-21

1988-05-10

Kamm, William E.

Surgery

Truss

Pad

128696, 128902, 128908, A61B 504

Patent

active

047428317

ABSTRACT:
Isolation circuitry for use with diagnostic ECG devices provides high common mode rejection and low leakage current using optoisolators in conjunction with an isolating operational amplifier. A predetermined pattern of binary input signals selectively energizes, via the optoisolators, a plurality of switches interposed between electrodes positioned on a patient's skin and the isolating operational amplifier. This selection couples a predetermined combination of electrodes to the isolating operational amplifier to provide the desired ECG output. The output from the isolating operational amplifier may be coupled directly to a recording device or coupled to a circuit which processes the ECG signal before the signal is recorded.

REFERENCES:
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patent: 3880146 (1975-04-01), Everett et al.
patent: 3910257 (1975-10-01), Fletcher et al.
patent: 3922686 (1975-11-01), France et al.
patent: 4037586 (1977-07-01), Grichnik
patent: 4106494 (1978-08-01), McEachern
patent: 4245649 (1981-01-01), Schmidt-Anderson
patent: 4245650 (1981-01-01), Welker et al.
"Analog Dialog", vol. 5, No. 2, Feb.-Mar. '71, pp 10-11.
Markus, Modern Electronic Circuits Reference Manual, p. 532, "Heart Monitor" (McGraw-Hill, 1980).
Olschewski, "Unique Transformer Design Shrinks Hybrid Isolation Amplifier'3 s Size and Cost", Electronics, Jul. 20, 1978, pp. 105-112.

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