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A main energy delivery electrical circuit for use in an implantable cardioverter defibrillator device comprises a low power output primary defibrillator battery, a high power output intermediate power intensifying capacitor system, a switch for permitting the intermediate power intensifying capacito

A main energy delivery electrical circuit for use in an implantable cardioverter defibrillator device comprises a low power output primary defibrillator battery, a high power output intermediate power intensifying capacitor system, a switch for permitting the intermediate power intensifying capacitor system to rapidly charge a main energy delivery capacitor, and a main energy delivery capacitor. The main energy delivery capacitor is configured for discharging, in a first pulse, an electrical charge derived from the primary battery, and for discharging certain subsequent pulses of electrical charge derived from the intermediate power intensifying capacitor system. The circuit permits the implantable cardioverter defibrillator device to deliver multiple closely spaced defibrillation pulses to a heart.

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A main energy delivery electrical circuit for use in an implantable cardioverter defibrillator device, comprising: a) a low power output primary defibrillator battery; b) a high power output intermediate power intensifying capacitor system; c) switch means, electrically connected to the intensifying

A main energy delivery electrical circuit for use in an implantable cardioverter defibrillator device, comprising: a) a low power output primary defibrillator battery; b) a high power output intermediate power intensifying capacitor system; c) switch means, electrically connected to the intensifying capacitor system and the primary defibrillator battery, for selectively switching between the primary defibrillator battery and the intensifying capacitor system; d) a high voltage transformer system electrically connected to the switch means; and a main energy delivery capacitor system connected to the transformer system for storing, in a first pulse to be discharged, an electrical charge from the primary defibrillator battery and for storing, as at least one subsequent pulse to be discharged, an electrical charge derived from the intensifying capacitor system, such that the electrical circuit permits the implantable cardioverter defibrillator device to deliver multiple closely spaced defibrillation pulses to a heart.