Standby heart pacer

Details Standby heart pacer Standby heart pacer

1975-11-05

1977-06-21

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

040305104

ABSTRACT:
A pace pulse generator connects to the heart for stimulating it as required. Heart action due to both natural and artificially stimulated beats is detected. Detected signals are variously processed and stored in a hysteresis circuit which serves as a memory as to the last naturally stimulated heart beat. With the hysteresis circuit set to operate in the negative mode, the hysteresis circuit will wait to determine if a natural beat occurs in a predetermined period of time. If no natural beat occurs, the hysteresis circuit turns on the pulse generator to furnish one or more artificial stimulating pulses until the circuit is reset by occurrence of a naturally stimulated heart beat. With the hysteresis circuit set to operate in the positive mode, the hysteresis circuit similarly waits to determine if a natural beat occurs in a predetermined period of time, but this predetermined period of time is less than the period between the constant rate pulses which are produced by the pulse generator.

REFERENCES:
patent: 3528428 (1970-09-01), Berkovits
patent: 3656487 (1972-04-01), Gobeli
patent: 3688776 (1972-09-01), Kenny
Leatham et al., "The Lancet", vol. 271, Dec. 8, 1956, pp. 1185-1189.
Firth-Cleveland Mfg. Publication No. FCI-955, Issue 2, Jan. 1961, 28 pp.

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