Cardiac pacer employing discrete frequency changes

Details Cardiac pacer employing discrete frequency changes Cardiac pacer employing discrete frequency changes

1976-12-17

1978-06-20

Kamm, William E.

Surgery

Truss

Pad

128419PG, A61N 136

Patent

active

040956032

ABSTRACT:
In the implantable cardiac pacer disclosed herein, a drop in battery voltage is signalled by a discrete change in the stimulation frequency of the pacer. Reliably distinct frequencies are obtained by digitally dividing, by two different integer factors, a stable high frequency pulse signal generated by a mechanically controlled oscillator, for example a piezoelectric crystal controlled oscillator.

REFERENCES:
patent: 3557796 (1971-01-01), Keller, Jr. et al.
patent: 3635224 (1972-01-01), Berkovits
patent: 3757793 (1973-09-01), Fester et al.
patent: 3841336 (1974-10-01), Daynard
patent: 3854472 (1974-12-01), Girot et al.
patent: 3870050 (1975-03-01), Greatbatch
patent: 3903897 (1975-09-01), Woollons et al.

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