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Optimal pulse defibrillator

  • US 5,645,573 A
  • Filed: 06/07/1995
  • Issued: 07/08/1997
  • Est. Priority Date: 10/12/1994
  • Status: Expired due to Fees
First Claim
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1. An improved implantable defibrillator apparatus for producing a capacitive-discharge defibrillation waveform to be delivered through at least two electrodes adapted for implantation in a human patient, the implantable defibrillator apparatus including a self-contained human implantable housing having electrical connections to at least two electrodes adapted for implantation in the human patient, the implantable housing containing a waveform-generating capacitor means for storing an electrical charge, means for charging the waveform-generating capacitor means, and means for selectively discharging the electrical charge in the capacitor means through the at least two electrodes in response to a control signal from a means for sensing of a cardiac arrhythmia in the human patient, the improvement comprising:

  • the means for selectively discharging including means for controlling the discharge of the capacitor means through the at least two electrodes to produce a defibrillation waveform comprising at least one electrical pulse having a predetermined optimum pulse duration that is set by the apparatus according to at least one pre-selected criterion selected from the set consisting of a fixed duration for the pulse waveform, a fixed tilt for truncation the pulse waveform, a minimum duration of the pulse waveform, a minimum tilt for the pulse waveform, and any combination thereof.

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