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Cardiac pacer

  • US 3,908,667 A
  • Filed: 01/17/1973
  • Issued: 09/30/1975
  • Est. Priority Date: 01/17/1973
  • Status: Expired due to Term
First Claim
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1. A heart pacing apparatus comprising a free-running means for generating a heart simulating electrical pulse stimulus having a predetermined interpulse period and pulse duration;

  • electrode means comprising means for monitoring the beating action of the heart for detecting the presence of a naturally occuring R-wave and adapted to be positioned relative to the heart for directing said free-running pulse stimulus into the heart for stimulating heartbeat action;

    coupling means for interconnecting said electrode means and said pulse stimulus generating means;

    amplifier means operatively connected to said monitoring means for initially amplifying said detected R-wave to provide an initially amplified output signal having a predetermined level therefrom when said R-wave is received;

    monostable multivibrator means operatively commected to said amplifier means for receiving said initially amplified output signal and generating a singleshot pulse therefrom having a predetermined pulse duration; and

    means responsive to said single-shot pulse stimulus for inhibiting the generation of said free-running pulse stimulus to said heart until said one present interpulse period after the last naturally occurring detected R-wave, said monostable multivibrator means comprising at least a first transistor means and a second transistor means operatively connected together for generating said single-shot pulse, said first transistor means providing both additional amplification of said detected R-wave in said amplifier means and cooperating with said multivibrator means second transistor means for raising said level of said initially amplified output signal to a predetermined value to cause said multivibrator means to provide said single-shot pulse;

    whereby said naturally occurring R-wave inhibits the generation of said stimulating pulse and synchronizes the timing of the next succeeding stimulating period.

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