Electronic capture detection for a pacer

A - Human Necessities – 61 – N

Patent

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A61N 1/365 (2006.01) A61N 1/37 (2006.01)

Patent

CA 2095601

A pacemaker sense amplifier which includes active circuitry which establishes and attempts to maintain a constant field density between two electrodes, effectively clamping them together at substantially fixed relative electrical potential. The amount of current or power provided to the electrodes is monitored and forms the basis of detection of the passing cardiac depolarization wavefront. A timer is used to define a detection window after the generation of a pacing pulse. The occurrence of a detected depolarization within the detection window indicates that the pacing pulse has captured the heart.

L'objet de la présente invention est un amplificateur de détection pour stimulateur cardiaque comportant un circuit actif servant à établir et à maintenir une intensité de champ constante entre deux électrodes, les serrant effectivement l'une contre l'autre à un potentiel électrique relatif essentiellement fixe. La quantité de courant ou de puissance qui parvient aux électrodes est régulée et constitue la base pour la détection du front d'onde de dépolarisation cardiaque. Une minuterie est utilisée pour définir une fenêtre de détection après la production d'une pulsation de stimulation. La détection d'un front de dépolarisation à l'intérieur de la fenêtre de détection indique que l'impulsion de stimulation a capturé le coeur.

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