Protection circuit and method for implanted ECG telemetry circui

Details Protection circuit and method for implanted ECG telemetry circui Protection circuit and method for implanted ECG telemetry circui

1986-03-12

1988-05-03

Kamm, William E.

Surgery

Truss

Pad

128697, 128903, A61N 136

Patent

active

047413417

ABSTRACT:
A protection circuit for an implanted telemetry circuit used to telemeter ECG or other low level signals sensed on the same lead whereon high level stimulation or other signals may also appear. The protection circuit includes a first FET switch that selectively connects a buffered monitoring point of the lead to the input of the telemetry circuit whenever a telemetry mode of operation is desired. A second FET switch switchably connects the buffered monitoring point to ground in the presence of any high level signals appearing on the lead, thereby preventing such high level signals from being applied to the telemetry circuit.

REFERENCES:
patent: 4114627 (1978-09-01), Lewyn et al.
patent: 4228803 (1980-10-01), Rickards
patent: 4300566 (1981-11-01), Stindt et al.
patent: 4506677 (1985-03-01), Lambert
patent: 4537201 (1985-08-01), Dellevedove et al.
patent: 4543955 (1985-10-01), Schroeppel
patent: 4558702 (1985-12-01), Barreras et al.
patent: 4567892 (1986-02-01), Plicchi et al.

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