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AssigneeVitatron Medical, B.V.
InventorsGustaaf A. Stoop, Malcolm J. S. Begemann, Johannes van der Veen, Marcus O. Filipovich
Estimating the term…
A rate adaptive pacemaker and method of operation, where the sensor-indicated rate is adjusted as a function of sensed sinus rate. The pacemaker is particularly adapted for VDDR operation. The natural sinus rate is compared to the sensor-indicated rate at one or more rates, and the sensor response function is adjusted, or adapted as a function of such comparisons, so as to optimize sensing of the atrial rate and maintenance of synchronous operation. The rate response function may be adjusted specifically at upper pacing limit, and may also be adjusted as a function of comparisons made at other rates.
(Amended). A rate responsive demand pacemaker having a pulse generator for generating and delivering stimulus pulses, rate sense means for sensing natural beats and obtaining a measure of the rate of said natural beats, a rate control for controlling the rate of delivery of stimulus pulses by said pulse generator, rate responsive means for obtaining sensor signals indicative of desired pacing rate and for generating therefrom sensor rate signals (R) in accordance with a rate response function which is a function of said sensor signals over a desired pacing range, said rate control circuit controlling said rate of delivery in accordance with R, characterized by first comparing means for comparing said measure of said natural beat rate and R at a predetermined rate, and adjust means operative during detection of natural beats for adjusting said rate response function as a function of said first comparison.
A pacemaker having a pulse generator for generating and delivering stimulus pulses, rate sense means for sensing natural beats and obtaining a measure of the rate of said natural beats, a rate control for controlling the rate of delivery of stimulus pulses by said pulse generator, rate responsive means for obtaining sensor signals indicative of desired pacing rate and for generating therefrom sensor rate signals (R) in accordance with a rate response function which is a function of said sensor signals over a desired pacing range, said rate control controlling said stimulus pulse rate as a function of R in the absence of sensed natural beats, further comprising rate response adjust means for automatically adjusting said rate response function as a function of said rate measure so as to track said rate measure, and means for limiting said adjusting.
A VDD pacemaker system for pacing a patient, having means for providing an adjustable rate response function, means for providing first criteria and second criteria, rate response means for obtaining sensor signals (S) and determining therefrom pacing rate signals (R) in accordance with said adjustable rate response function, and means for determining a measure of natural atrial rate of the patient, comprising first adjust means for adjusting said rate response function positively when R is lower than said natural rate in accordance with said first criteria, and second adjust means for adjusting said rate response function negatively when R is not below said natural rate in accordance with said second criteria.
Dependencies are inferred from the claim text.