Dual capacitor biphasic defibrillator waveform generator employing selective connection of capacitors for each phase
First Claim
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1. A pulse generator for generating a defibrillation waveform in a defibrillator for discharge between at least two electrodes implanted on or about the heart, said pulse generator comprising:
- a first capacitor;
a second capacitor;
first switch means for connecting the first capacitor and second capacitor in series or in parallel;
lead lines for connecting the first and second capacitors to said at least two electrodes;
means for charging said first and second capacitors;
second switch means for connecting said first and second capacitors to said lead lines; and
switch control means for controlling said first and second switch means to connect said first and second capacitors in parallel for discharge via said at least two electrodes for a first phase of a biphasic waveform, and to connect said first and second capacitors in series for a second phase of said biphasic waveform.
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Abstract
An implantable defibrillator/cardioverter which generates a biphasic defibrillation/cardioversion waveform including a pulse generator comprising two capacitors and a pair of switches for connecting the capacitors in parallel during a first phase and in series during a second phase. The first phase has a small "tilt" between the leading edge voltage and the trailing edge voltage. The second phase has a leading edge voltage which is approximately twice the trailing edge voltage of the first phase.
351 Citations
5 Claims
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1. A pulse generator for generating a defibrillation waveform in a defibrillator for discharge between at least two electrodes implanted on or about the heart, said pulse generator comprising:
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a first capacitor; a second capacitor; first switch means for connecting the first capacitor and second capacitor in series or in parallel; lead lines for connecting the first and second capacitors to said at least two electrodes; means for charging said first and second capacitors; second switch means for connecting said first and second capacitors to said lead lines; and switch control means for controlling said first and second switch means to connect said first and second capacitors in parallel for discharge via said at least two electrodes for a first phase of a biphasic waveform, and to connect said first and second capacitors in series for a second phase of said biphasic waveform. - View Dependent Claims (2)
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3. A method for generating a defibrillation waveform in an implantable defibrillator for discharge between at least two electrodes implanted on or about the heart, said method comprising the steps of:
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providing first and second capacitors; connecting with a first Switch means said first and second capacitors in parallel; discharging said first and second capacitors connected in parallel to generate a first phase of a biphasic waveform; connecting with a second switch means said first and second capacitors in series and in reverse polarity at the end of the first phase; and discharging said first and second capacitors connected in series to generate a second phase of a biphasic waveform.
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4. A method for generating a biphasic defibrillation waveform comprising the steps of:
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generating from a first capacitor and a second capacitor connected in parallel by a first switch means a first phase having a predetermined tilt between a leading edge voltage and a trailing edge voltage; and generating from the first capacitor and the second capacitor connected in series by a second switch means a second phase having a leading edge voltage approximately twice that of the trailing edge voltage of the first phase.
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5. An implantable defibrillation/cardioversion system comprising:
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at least two implanted defibrillation/cardioversion electrodes; a pulse generator connected to the electrodes for generating a defibrillation waveform in an implantable defibrillator/cardioverter for discharge between said at least two electrodes implanted on or about the heart, said pulse generator comprising; a first capacitor; a second capacitor; first switch means for connecting the first capacitor and second capacitor in series or in parallel; means for charging said first and second capacitors; second switch means for connecting said first and second capacitors to lead lines connecting to said at least two electrodes; and switch control means for controlling said first and second switch means to connect said first and second capacitors in parallel for discharge via said at least two electrode for a first phase of a biphasic waveform, and to connect said first and second capacitors in series for a second phase of said biphasic waveform.
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Specification