Defibrillator with controllable discharge switch

Details Defibrillator with controllable discharge switch Defibrillator with controllable discharge switch

1993-08-17

1994-10-25

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 5, A61N 139

Patent

active

053585127

ABSTRACT:
Defibrillation of a heart ensues using a charging capacitor connected via a controllable switch arrangement to electrodes arranged in the region of the heart, the switch arrangement being operated to discharge across the heart tissue. In order to limit the initial current to a value not significantly exceeding the minimum value necessary to effect defibrillation, the controllable switch arrangement includes two contacts between which a contact maker, for example a mercury drop, is disposed, which is deformable under the influence of an electro-mechanical transducer. The transducer is arranged such that the contact maker connects the two contacts to one another given a prescribed excursion of the electro-mechanical transducer and, given a change of the excursion departing from the prescribed excursion, varies the electrical resistance between the contacts. The drive of the controllable switch arrangement ensues with turn-on pulses having a pulse height that is variable for setting the desired electrical resistance between the contacts.

REFERENCES:
patent: 4494544 (1985-01-01), Lambert
patent: 4800883 (1989-01-01), Winstrom
patent: 5222492 (1993-06-01), Morgan et al.

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