Multi-mode microprocessor-based programmable cardiac pacer

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

1982-09-30

1984-08-28

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

044678100

ABSTRACT:
An instruction memory for a microprocessor based cardiac pacer is equipped with code means defining improved pacing routines for accomplishing a programmably selectable 2:1 block mode in which every other atrial sense output is automatically ignored above a programmed maximum atrial rate. The 2:1 block option is preselected via the initialization routine. The atrial refractory period becomes programmable by equating it with the programmed maximum rate interval. As an alternative to 2:1 block mode, the pacer also offers VVI fallback pacing routine which can be automatically substituted for the main pacing routine. While atrial tachycardia continues to be monitored during the fallback routine, the criteria for resuming normal pacing are made different from the criteria for entering the fallback routine. In addition, before exiting the fallback routine, the R-R interval is lengthened by an amount to shift the phase of R-waves relative to P-waves. Both refractory periods and the real time clock register are adjusted by the main pacing routine to account for blanking. After any programming, normal operation is resumed by re-entering the main pacing routine as if it were at the end of a ventricular event.

REFERENCES:
patent: 4208008 (1980-06-01), Smith
patent: 4222385 (1980-09-01), Backhouse
patent: 4313441 (1982-02-01), Buffet
patent: 4390021 (1983-06-01), Spurrell et al.
patent: 4418695 (1983-12-01), Buffet
patent: 4424812 (1984-01-01), Lesnick

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