After potential removal in cardiac rhythm management device

A - Human Necessities – 61 – N

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A61N 1/37 (2006.01)

Patent

CA 2224455

An apparatus effectively removes after potential occurring after a electrical pulse is delivered in a cardiac rhythm management system such as a pacemaker system or cardioverter/defibrillator system having an electrode used for both sensing electrical activity of the heart and carrying the electrical pulse to the heart and a sense amplifier for detecting the electrical activity from the electrode. The apparatus includes a lowpass filter coupled to the electrode to filter the sensed electrical activity. A highpass filter is coupled between the lowpass filter and the sense amplifier to further filter the electrical activity passed from the lowpass filter. Equilibrium circuitry is included to allow passive filter components of the lowpass filter and the highpass filter to return to an equilibrium state following delivery of the electrical pulse.

L'invention porte sur un appareil éliminant le potentiel consécutif à l'émission d'une impulsion dans un système de gestion du rythme cardiaque tel qu'un stimulateur ou un défibrillateur. Ledit appareil comporte une électrode servant à la fois à détecter l'activité électrique du coeur et à acheminer l'impulsion électrique vers le coeur, et un amplificateur de détection détectant l'activité électrique de l'électrode ainsi qu'un filtre passe-bas relié à l'électrode pour filtrer l'activité électrique détectée, et un filtre passe-haut placé entre le filtre passe-bas et l'amplificateur de détection pour assurer un filtrage supplémentaire de l'activité électrique provenant du filtre passe-bas. Il comporte en outre un circuit d'équilibrage ramenant les composantes passives des filtres passe-bas et passe-haut à un état d'équilibre après l'émission d'une impulsion électrique.

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