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Apparatus for combining pacing and cardioverting functions in a single implanted device

  • US 4,440,172 A
  • Filed: 12/11/1980
  • Issued: 04/03/1984
  • Est. Priority Date: 10/02/1980
  • Status: Expired due to Term
First Claim
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1. An implantable defibrillation system for implantation in a patient comprising a ground reference, defibrillating means for generating high-voltage defibrillating pulses, an ECG amplifier for sensing cardiac signals, common conductor means electrically connected to both said defibrillating means and said ECG amplifier for transferring both defibrillating pulses and cardiac signals respectively to and from said patient through said ground reference, said defibrillating means being connected to said common conductor means, and interface means being electrically connected to said amplifier and said common conductor means for limiting the voltage applied to said amplifier during the presence of a defibrillating pulse and for transferring a substantial portion of said cardiac signal to said amplifier during the absence of a defibrillating pulse.

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