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Defibrillator waveform generator for generating waveform of long duration

  • US 5,634,938 A
  • Filed: 10/25/1995
  • Issued: 06/03/1997
  • Est. Priority Date: 01/30/1992
  • Status: Expired due to Term
First Claim
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1. A system for generating a defibrillation waveform including a defibrillator and an electrode structure, the system comprising:

  • a single capacitor having a capacitance of at least 200 microfarads;

    means for charging said capacitor to a maximum voltage of less than 400 volts;

    switch means for connecting said capacitor to said electrode structure; and

    switch control means for controlling said switch means to connect said capacitor to said electrode structure for discharge via said electrode structure in a first polarity for a first phase of a biphasic waveform, and to connect said capacitor to said electrode structure in a polarity opposite said first polarity for a second phase of said biphasic waveform;

    the first phase having duration equal to or greater than said second phase, the total duration of the first and second phases being at least 15 milliseconds, a trailing edge voltage of said first phase being greater than fifty percent of a leading edge voltage of the first phase and the biphasic waveform having a fixed tilt so as to produce a fixed low tilt biphasic waveform.

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