Pacemaker with switchable circuits and method of operation of sa

Details Pacemaker with switchable circuits and method of operation of sa Pacemaker with switchable circuits and method of operation of sa

1985-09-19

1987-05-19

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

046659196

ABSTRACT:
A device such as a cardiac pacemaker or other implantable biomedical device, and method of operation thereof, containing one or more switchable circuits. A control system, preferably incorporating a microprocessor, controls predetermined changes of the operating characteristics of the switchable circuits. In a cardiac pacer embodiment, a circuit such as the input amplifier can be switched to have different characteristics, e.g. filter setting and sensitivity, during predetermined portions of the pacer cycle. Further, the operation of a circuit can be monitored over a plurality of operating cycles, with controlled switching of the circuit characteristics as a function of cumulative monitored circuit performance. A specific example of the invention is shown for changing characteristics of a filter circuit used in a pacer which adjusts the pacer rate as a function of determined stimulus-T wave time interval.

REFERENCES:
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patent: 4114627 (1978-09-01), Lewyn et al.
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patent: 4228803 (1980-10-01), Rickards
patent: 4266551 (1981-05-01), Stein
patent: 4305396 (1981-12-01), Wittkampf et al.
patent: 4325384 (1982-04-01), Blaser et al.
patent: 4381786 (1983-05-01), Duggan
patent: 4390022 (1983-06-01), Calfee et al.
patent: 4436093 (1984-03-01), Belt

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