Implantable heart pacemaker

Details Implantable heart pacemaker Implantable heart pacemaker

1982-08-03

1984-08-07

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

044637608

ABSTRACT:
As the battery of a heart pacemaker is discharged, its internal resistance rises, as a result of which the amplitude of the stimulation pulses decreases. In order to still be able to generate stimulation pulses with an amplitude which lies above the threshold of the heart even given a battery which has already been largely discharged, it is inventively provided that the discharge of the output capacitor can only be triggered given attainment of a specific minimum voltage (V.sub.min) at said output capacitor. That can be advantageously executed with the assistance of a comparator which compares the voltage at the capacitor to a comparison voltage (V.sub.min) and which inhibits the actuation of a switch via a NOR gate until matching has been achieved. The base frequency of the heart pacemaker and the pulse width can be fixed by two monostable flip-flops.

REFERENCES:
patent: 3842844 (1974-10-01), Alferness
patent: 3901247 (1975-08-01), Walmsley
patent: 4114628 (1978-09-01), Rizk
patent: 4423733 (1984-01-01), Grassi et al.

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