Switched discharge pathways for ICD having multiple output capac

Details Switched discharge pathways for ICD having multiple output capac Switched discharge pathways for ICD having multiple output capac

1996-12-09

1998-06-16

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 139

Patent

active

057662266

ABSTRACT:
A high voltage output system for use with an implantable cardioverter defibrillator (ICD) system provides for switched discharge pathways utilized to achieve a windshield wiper-like output. The high voltage output system includes at least two output capacitors each having at least a separately electrically accessible one of the cathode and anode of the capacitor system. A switching control system selectively discharges the at least two capacitor systems in a repeated alternating sequence such that the one of the cathode and anode of the capacitor systems is discharged through a common electrode and the other of the cathode and anode is electrically connected for at least a portion of the discharge to a second and third defibrillation electrode, respectively. In a preferred embodiment, the cathode of each of the capacitor systems would be connected to a right ventricular (RV) defibrillation electrode, with the second and third defibrillation electrodes being a superior vena cava (SVC) electrode and a housing can (CAN) electrode. By utilizing the selectively switched discharge pathway system of the present invention, the size of the capacitor system can be reduced because the duration of the capacitive discharge is extended as a result of the alternating sequence between at least two capacitor systems, and because the heart is subjected to a more effective defibrillation countershock which continually sweeps across the heart during the capacitive discharge in a windshield wiper-like manner.

REFERENCES:
patent: 5324309 (1994-06-01), Kallok
patent: 5584865 (1996-12-01), Hirschberg et al.

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