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Implantable defibrillation system and method for producing only short pulse waveforms

  • US 5,591,210 A
  • Filed: 08/24/1994
  • Issued: 01/07/1997
  • Est. Priority Date: 09/29/1992
  • Status: Expired due to Fees
First Claim
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1. An improved process for operating an implantable defibrillator system to produce a monophasic truncated capacitive-discharge defibrillation countershock, the implantable defibrillator system being a self-contained human implantable device including a pulse-generating capacitor means for storing an electrical charge, means for internally charging the pulse-generating capacitor means, and means for selectively discharging the electrical charge in the pulse-generating capacitor for a specified pulse duration as a countershock to be delivered through electrodes implanted in a human patient in response to a sensing of a myocardial arrhythmia in the human patient, the improvement comprising the steps of:

  • selecting a capacitance value and a maximum charging voltage for the pulse-generating capacitor means such that a delivered energy of the countershock is less than 25 joules; and

    controlling the means for selectively discharging the electrical charge so as to only deliver the countershock as a waveform having a maximum duration of less than 5.99 milliseconds and a tilt of greater than 50%.

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