Multi-mode microprocessor-based programmable cardiac pacer

Details Multi-mode microprocessor-based programmable cardiac pacer Multi-mode microprocessor-based programmable cardiac pacer

1980-11-14

1984-12-04

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

044858183

ABSTRACT:
An implantable, microprocessor-based cardiac pacer provides physiologically adaptive pacing in four fundamental modes: ventricular-inhibited; atrial-synchronized ventricular with or without ventricular sensing; and atrial-ventricular (AV) sequential. In the AV sequential mode, the pacer automatically shifts to atrial synchronous ventricular pacing when the atrial rate exceeds the programmed minimum rate. Temporary pacing modes are available for treatment of arrhythmia and either atrial or ventricular overdrive pacing via chest wall stimulation. The pacer continuously monitors tachyarrhythmia and automatically enters and exits a special arrhythmia response mode. Eight parameters can be altered one at a time or reprogrammed to a standard set in a single programming step using pre-existing magnetic programmers. A weak battery is signified by substituting a lower frequency voltage-sensitive backup oscillator and by dropping the atrial beat in the magnet rate. Sense amplifier blanking is executed in software while rate limit is executed in both software and separate hardware circuits.

REFERENCES:
patent: 4038991 (1977-08-01), Walters
patent: 4114627 (1978-09-01), Lewyn et al.
patent: 4166470 (1979-09-01), Neumann
patent: 4181133 (1980-01-01), Kolenik et al.
patent: 4222385 (1980-09-01), Backhouse
patent: 4312355 (1982-01-01), Funke
patent: 4313441 (1982-02-01), Buffet

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