Apparatus and method for inducing fibrillation

Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems

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607 2, A61N 1362

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active

056499710

ABSTRACT:
A method and apparatus for inducing fibrillation in a patient's heart by delivering a direct current stimulus to the heart from a DC-to-DC converter. The hardware of a conventional implantable cardioverter/defibrillator (ICD) is utilized with a modification to the control algorithms. Particularly, when it is desired to induce fibrillation in a patient's heart, typically during ICD implant defibrillation threshold (DFT) testing, a command is delivered from an external instrument to the ICD to deliver the fibrillation shock. The DC-to-DC converter which is normally used to charge the ICD high voltage capacitors is activated and immediately thereafter or following a short period to allow the high voltage capacitors to charge, the high voltage output switches of the output stage are closed. This delivers the output current from the DC-to-DC converter to the defibrillation electrodes and through the patient's heart. This stimulus is continued for a predetermined time of between about 30 milliseconds to 5 seconds. At that point the output switches are opened and the converter is shut off. This DC stimulus delivered directly to the patient's heart induces fibrillation.

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"Cadence.RTM. Tiered therapy Defibrillator System--V-100 Serial Pulse Generator and Programmer", Physician's Manual, Ventritex, Inc., Jan. 1993.

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