Pacer demand-rate test mode control

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

A - Human Necessities

61

N

326/1.2

A61N 1/36 (2006.01) A61N 1/37 (2006.01)

Patent

CA 1104655

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 made 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.

301002

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