Biotronik Crm Patent Ag

Biotronik Mess-und Therapiegerate Gmbh & Co Ingenieurburo Berlin

Wolf Worzewski

Olaf Schermeier

Certain embodiments of the present invention disclose an electrostimulator, in particular an atrial cardiac pacemaker, comprising electrode connections which are connected to a stimulation unit for the delivery of stimulation pulses by way of the electrode connections, and a stimulation control unit which is connected to the stimulation unit and adapted to trigger the delivery of stimulation pulses and to determine the strength of the stimulation pulses and for that purpose to deliver a stimulation control signal to the stimulation unit, and a detection unit which is connected to the stimulation control unit and at least indirectly to the electrode connections and adapted to evaluate electrical potentials at the electrode connections and to detect intrinsic (natural, spontaneous) events. The stimulation control unit is adapted to produce a far-field signal if the detection unit detects an intrinsic atrial event within a predetermined far-field coupling interval which begins after triggering of a ventricular stimulation pulse.

Cardiac pacemaker

Two-chamber pacemaker (,), comprising atrium sensing means (EA,,) as well as ventricle sensing means (EV,,) and refractory switching means (,B) for influencing the processing of output signals from the atrium sensing means for a predetermined refractory time, further comprising ventricle stimulation means (,EV) and a stimulation control unit (,A), which effects a changeover back from a non-atrium synchronous 1:1 operating mode to an atrium-synchronous 1:1 operating mode in dependence on the signals from the atrium sensing means that are influenced by the refractory switching means. A signal pattern memory is provided in this case for storing a signal sequence pattern, which reflects a predetermined sequence of heart activities, a signal sequence memory for storing a sequence of output signals from the atrium and the ventricle sensing means, comparator means for comparing the sequence of output signals to the stored signal sequence pattern and for emitting an output signal if the two coincide, as well as refractory changeover means for adjusting a shortened refractory time for the refractory switching means in dependence on the output signal from the comparator means.

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Berlin, Germany

Wolf Worzewski