Digital cardiac pacer with refractory count inhibition

Details Digital cardiac pacer with refractory count inhibition Digital cardiac pacer with refractory count inhibition

A - Human Necessities

61

N

326/1.5

A61N 1/36 (2006.01) A61N 1/372 (2006.01)

Patent

CA 1106450

ABSTRACT OF THE DISCLOSURE A digitally controlled cardiac pulse generator includes a low frequency oscillator and a high frequency oscillator and logic means responsive to said oscillators so that the time between stimulating pulses provided by such pulse generator is determined by the low frequency oscillator and the width of the stimulating pulse is determined by the high frequency oscillator. In addition, logic means are included for comparing the frequency of the low frequency oscillator against the high frequency oscillator to insure against pacemaker runaway. A counter is incremented to a first value when it is reset by a signal which also provides a stimulating pulse. Detection of a signal indi- cating a heart contraction resets the counter. A refractory signal is provided when a certain count is reached to prevent a sensed signal from resetting the counter from the time the counter is reset until the refractory signal is provided.

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