Patent ID: 6954669

Claim:
A system to generate a defibrillation waveform, comprising: an implantable defibrillator comprising a set of capacitors and switching circuitry connected to the capacitors and operative to selectively discharge the capacitors so as to generate a first phase of a biphasic defibrillation pulse waveform wherein the first phase of the waveform has at least three distinct voltage peaks; wherein the set of capacitors comprises first, second and third capacitors; and wherein the switching circuitry is operative to: generate a first step of the pulse waveform by discharging the capacitors while the first, second and third capacitors are connected in parallel; generate a second step of the pulse waveform by discharging the capacitors while the first and second capacitors are connected in parallel and the third capacitor is connected in series; and generate a third step of the pulse waveform by discharging the capacitors while the first, second and third capacitors are connected in series.