Pacer demand-rate test mode control

Details Pacer demand-rate test mode control Pacer demand-rate test mode control

1977-04-21

1978-07-25

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

041023455

ABSTRACT:
In an implanted heart stimulating device of the demand type, test mode circuitry is arranged to cause the temporary generation of stimulation impulses at the demand-rate in the presence of naturally occurring heartbeats. The test mode circuitry may cause dependence of the heart-stimulation rate upon the level of the power source within the test mode or at least a portion of the test mode, but is arranged to provide a heart-stimulation rate independent of the level of the power source in the ordinary demand mode. The test mode circuitry is operative, through a relatively simple bias-modifying circuit, to force the pacer to generate at least several stimulating impulses at the demand-rate immediately following cessation of that portion of the test mode in which stimulation impulses are generated at a rate dependent upon the level of the power source. Subsequently, the pacer reverts to the ordinary (i.e., non-forced) demand mode.

REFERENCES:
patent: 3651799 (1972-03-01), Daynard
patent: 3661152 (1972-05-01), Berkovits
patent: 3662759 (1972-05-01), Dabolt
patent: 3837348 (1974-09-01), Thaler

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