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Ring-to-ring cardiac electrogram pacemaker

  • US 5,265,602 A
  • Filed: 07/13/1992
  • Issued: 11/30/1993
  • Est. Priority Date: 07/13/1992
  • Status: Expired due to Term
First Claim
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1. An implantable cardiac pacemaker system, comprising:

  • a pulse generator, adapted to produce cardiac stimulating pulses;

    a bipolar transvenous atrial pacing/sensing lead coupled to said pulse generator, said atrial lead having a first atrial conductor therein coupled to a tip electrode at a distal end of said lead and a second atrial conductor therein coupled to a ring electrode spaced apart from said tip electrode, said distal end of said lead disposed in a patient'"'"'s atrium such that electrical signals in said atrium are received by said atrial ring electrode and conducted by said first atrial conductor;

    a bipolar transvenous ventricular pacing/sensing lead coupled to said pulse generator, said ventricular lead having a first ventricular conductor therein coupled to a tip electrode at a distal end of said lead and a second ventricular conductor therein coupled to a ring electrode spaced apart form said tip electrode, said distal end of said ventricular lead being disposed in the patient'"'"'s ventricle such that electrical signals in said ventricle are received by said ventricular ring electrode and conducted by said first ventricular conductor;

    an EGM amplifier circuit having first and second inputs, adapted to produce an output signal corresponding to a difference between voltages applied to said first and second inputs;

    switching circuitry, adapted to selectively couple said second atrial conductor to said first input of said EGM amplifier circuit and said second ventricular conductor to said second input of said EGM amplifier circuit, such that said atrial electrical signals are applied to said first EGM amplifier circuit input and said ventricular electrical signals are applied to said second EGM amplifier circuit input.

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