The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 1994
Filed:
Aug. 17, 1993
Kurt Hoegnelid, Vasterhaninge, SE;
Kenth-Ake-Sune Nilsson, Akersberga, SE;
Siemens Aktiengesellschaft, Munich, DE;
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.