Cardiac pacing apparatus with electromagnetic interference prote

Details Cardiac pacing apparatus with electromagnetic interference prote Cardiac pacing apparatus with electromagnetic interference prote

1976-08-03

1978-05-30

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

040918181

ABSTRACT:
A cardiac pacing apparatus of the type having a first signal processing channel which functions in the demand mode is disclosed including a second signal processing channel for detecting electromagnetic interference and causing the pacing apparatus to revert to a safe operating rate in the presence of such interference. In a preferred embodiment, the second signal processing channel has an enhanced high-frequency response with respect to that of the first signal processing channel in order to optimize interference detection. The second channel may receive an input from either a conventional cardiac sensing and pacing electrode, or else a second electrode, remote from the heart, may be provided for interference detection. When electromagnetic interference is detected by the second signal processing channel, an override of the conventional demand pacer inhibit function occurs and the pacing apparatus is switched to a safe operating rate, which may be either an appropriate predetermined fixed rate or a rate-limited rate synchronous with the detected electromagnetic interference. In an alternate embodiment, the gain of the second signal processing channel is reduced with respect to that of the first channel, and the pacing apparatus is switched to a safe operating rate upon the detection of electromagnetic interference having an amplitude level above that of natural cardiac signals.

REFERENCES:
patent: 3678937 (1972-07-01), Cole et al.
patent: 3881493 (1975-05-01), Cannon
patent: 3903897 (1975-09-01), Wollons et al.
patent: 3920024 (1975-11-01), Bowers
patent: 3972334 (1976-08-01), Wickham

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