Patent ID: 6298266
Filing Date: 2001-10-02
Classification: A61N

Abstract:
A defibrillation waveform generator comprising:an arrhythmia detector adapted to be coupled to a heart, the arrhythmia detector delivering a detection signal in response to detecting fibrillation in the heart;a capacitor:a charging circuit coupled to the capacitor, the charging circuit charging the capacitor to a given voltage;a controller operably coupled to the arrhythmia detector to receive the detection signal, the controller delivering a first control signal, a second control signal, and a third control signal in response to receiving the detection signal;a voltage-to-frequency convertor coupled to the controller to receive the first control signal, the voltage-to-frequency convertor delivering a frequency signal having a frequency correlative to the first control signal;a pulse width modulator coupled to the controller to receive the second control signal and coupled to the voltage-to-frequency convertor to receive the frequency signal, the pulse width modulator delivering a pulse width modulated signal having a frequency correlative to the frequency signal and having a duty cycle correlative to the second control signal; anda switching circuit adapted to be coupled between the capacitor and the heart, the switching circuit being coupled to the controller to receive the third control signal and to the pulse width modulator to receive the pulse width modulated signal, the switching circuit controllably discharging the capacitor across the heart to deliver a defibrillation waveform in response to the third control signal and the pulse width modulated signal.