Biotronik Mess-und Therapiegerate Gmbh & Co Ingenieurburo Berlin

Jos Backers

A dual-chamber cardiac pacemaker having a stimulation control unit for time control of the production and output of the stimulation pulses, and a method of operating the pacemaker according to the current invention are provided. The pacemaker comprising switching means for switching over from an asynchronous to a vestibule-synchronous mode, criterion memory means for storage of at least one switching-over criterion for mode switching-over, and a processing unit for processing signals from the atrium sensing means and the ventricle sensing means and the timer for checking fulfilment of the switching-over criterion, wherein the criterion memory means has a signal sequence memory for storage of a predetermined selection of signal sequence patterns reflecting an electrical activity of the heart and the processing unit has comparison means for comparison of the electrical activity detected by the atrium sensing means and the ventricle sensing means in a plurality of successive cardiac cycles to the stored signal sequence patterns and the stimulation control unit further has counting means connected to the comparison means on the input side for counting the number of cardiac cycles in which identity of the detected electrical activity was established with one of the pre-stored signal sequence patterns, within a predetermined total number of successive cardiac cycles.

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Oudenburg, Belgium

Jos Backers