Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1992-10-27
1994-11-22
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 100
Patent
active
053664850
ABSTRACT:
The present invention is an apparatus to apply an electrical pretreatment of pulses to a fibrillating heart that begins the process of organizing the action of the chaotically contracting myocardial cells, so that the defibrillating waveform applied after the pretreatment can accomplish its task with less energy than would otherwise be required. The same electrodes are employed for both pretreatment and defibrillation. In one preferred embodiment a long-duration, low-voltage pretreatment pulse is generated directly by battery and voltage-conversion circuitry, and is followed by the defibrillation pulse delivered from the previously charged capacitor. In variations on the embodiments, the capacitor is charged during the pretreatment pulse, or between the pretreatment and defibrillation pulses. In other embodiments, pretreatment includes a train of pulses of appreciably lower energy than the defibrillation pulse, and with inter-pulse time adjusted so that necessary capacitor recharging can be accomplished, so that the same capacitor (a component of dominant size) can be used for all pretreatment pulses and for the defibrillation pulse as well. Wide-ranging variations of pulse duration, height spacing and waveform are included, as well as selected polarity inversions.
REFERENCES:
patent: 4637397 (1987-01-01), Jones et al.
patent: 5052407 (1991-10-01), Hauser et al.
Adams Theodore P.
Kroll Mark W.
Angeion Corporation
Getzow Scott M.
Kamm William E.
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