Patent ID: 6192274
Filing Date: 2001-02-20
Classification: A61N

Abstract:
Two-chamber pacemaker (100), comprising:atrium sensing means (EA, 107) for sensing electrical activity in the atrium (A) and ventricle sensing means (EV, 105) for sensing electrical activity in the heart chamber (V) of a heart (H) and for emitting corresponding output signals,refractory switching means (100B) for influencing the processing of output signals of the atrium sensing means for a predetermined refractory period, following the appearance of an output signal from the atrium or the ventricle sensing means,ventricle stimulation means (106, EV) for generating stimulation pulses and the transmitting of these pulses to the ventricle anda stimulation control unit (100A) for controlling the time when the stimulation pulses are emitted,characterized in thata signal pattern memory (114) is provided for storing a signal sequence pattern, which reflects a predetermined sequence of heart activities, or a predetermined number of specified activities,a signal sequence memory (113) is provided for storing a sequence of output signals from the atrium sensing means and the ventricle sensing means,comparator means (115) are provided for comparing a sequence of output signals with the stored signal sequence pattern or the number of predetermined activities and for emitting an output signal if the two coincide, andrefractory changeover means (116) are provided for adjusting a shortened refractory time for the refractory switching means in dependence on the output signal from the comparator means.