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Implantable cardiac defibrillator employing bipolar sensing and telemetry means

  • US 4,614,192 A
  • Filed: 03/23/1983
  • Issued: 09/30/1986
  • Est. Priority Date: 04/21/1982
  • Status: Expired due to Term
First Claim
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1. An implantable defibrillation system for automatically defibrillating the heart of a patient comprising:

  • detecting means for detecting fibrillation of the heart;

    defibrillation means responsive to said detecting means for generating and applying to said heart at least one high-energy defibrillating pulse, said defibrillating means including a storage capacitor and a high voltage inverter means for charging said storage capacitor, said high voltage inverter means capable of emitting radio frequency (RF) signals during the charging of the storage capacitor, said RF signals capable of being detected externally of the patient;

    counting means responsive to said defibrillating means for maintaining defibrillating pulse count information and for providing the pulse count information to a telemetry means;

    telemetry means connected to said counting means and said high voltage inverter means for receiving the pulse count information and for transmitting information signals indicative of said pulse count information externally of the patient, wherein said telemetry means includes frequency modulation means for frequency modulating the RF signals emitted by said inverter means during the charging of said storage capacitor in accordance with the pulse count information, said telemetry means being responsive to a telemetry control signal to transmit said information signals;

    control means for receiving an activation signal generated externally of the patient and, in response to said activation signal, for providing an inverter start signal to said high voltage inverter means to initiate the running of said inverter means and to discharge said storage capacitor upon completion of the running of the inverter means, and to provide a telemetry control signal to said telemetry means; and

    external activation means for generating an activation signal external of the patient.

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