Single capacitor truncated damped sinusoidal defibrillation waveform
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
Apr 10, 1997
filing date -
Apr 12, 1996
priority date (Note) -
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Abstract
A method and apparatus for delivering a truncated damped sinusoidal external defibrillation waveform which, when applied through a plurality of electrodes positioned on a patient's torso will produce a desired response in the patient's cardiac cell membranes is provided. The method includes the steps monitoring a patient-dependent electrical parameter and determining a duration based on the parameter determined. A first set of charge storage capacitors is then charged. A first truncating switch is then closed to discharge the first set of capacitors. Then, after the duration period that was calculated has expired the switch is opened to truncate the waveform. The computation of discharge duration is made as a function of the desired cardiac membrane response function, a patient model and a defibrillator circuit model.
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