Abstract: A power management system for an implantable device is disclosed. One application is an implantable cardioverter/defibrillator. Charging circuits for implantable cardioverter/defibrillators require relatively large currents from the power supply. The present power management system provides extended device operation and reduced charge cycle time. The present system monitors both current and voltage drawn from the power supply to prevent a loss of system voltage. Elective replacement indication is performed using charging information provided by the present power management system.

Abstract: A power management system for an implantable device is disclosed. One application is an implantable cardioverter/defibrillator. Charging circuits for implantable cardioverter/defibrillators require relatively large currents from the power supply. The present power management system provides extended device operation and reduced charge cycle time. The present system monitors both current and voltage drawn from the power supply to prevent a loss of system voltage. Elective replacement indication is performed using charging information provided by the present power management system.

Abstract: An automatic implantable defibrillator/cardioverter having a non-committed defibrillation/cardioversion algorithm. The defibrillator/cardioverter includes an ECG amplifier with automatic gain control (AGC) which detects the electrical activity of the heart for analysis by a cardiac condition detector. Logic is provided which receives input from the ECG amplifier and the cardiac condition detector for analyzing the heart activity. The non-committed defibrillation algorithm sensing begins upon the determination of an arrhythmia. The capacitor is charged while the heart activity is simultaneously monitored. After the capacitor is charged, a check is made on the duration of the last detected R-R interval while so charging the capacitor, and a comparison is made between this R-R interval and a preset value. If the last R-R interval is greater than the preset value, a non-committing period is entered which lasts approximately 2 seconds.