Digital cardiac pacer
First Claim
1. In a digital pulse generator used in conjunction with a lead coupled between said pulse generator and a subject'"'"'s heart, and including a counter which is incremented at a given rate, means responsive to said counter having been incremented to a certain value for providing a first signal to said counter for resetting said counter, said first signal further being provided to means for providing a stimulating pulse over said lead to cause said heart to contract, and sensing means for providing a signal manifesting the sensed contraction of said heart, said sensing means signal being applied to reset said counter, the improvement of a refractory circuit comprising:
- first means for providing a refractory signal in response to said counter having been incremented to a count manifesting a refractory time; and
second means responsive to the signals resetting said counter and said refractory signal for preventing said sensing means signal from resetting said counter from the time said counter is once reset until said refractory signal is provided.
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Abstract
A digitally controlled 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.
9 Citations
7 Claims
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1. In a digital pulse generator used in conjunction with a lead coupled between said pulse generator and a subject'"'"'s heart, and including a counter which is incremented at a given rate, means responsive to said counter having been incremented to a certain value for providing a first signal to said counter for resetting said counter, said first signal further being provided to means for providing a stimulating pulse over said lead to cause said heart to contract, and sensing means for providing a signal manifesting the sensed contraction of said heart, said sensing means signal being applied to reset said counter, the improvement of a refractory circuit comprising:
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first means for providing a refractory signal in response to said counter having been incremented to a count manifesting a refractory time; and second means responsive to the signals resetting said counter and said refractory signal for preventing said sensing means signal from resetting said counter from the time said counter is once reset until said refractory signal is provided. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification