A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.1
A61N 1/36 (2006.01) A61N 1/368 (2006.01)
Patent
CA 1128137
ABSTRACT A generating circuit for producing atrial and ventricular timing signals for a pacemaker which allows independent control of ventricular rate and atrial-ventricular delay. A voltage ramp signal is generated and compared to a reference voltage signal by a voltage comparator which produces an output signal when the ramp voltage reaches the reference voltage. A second voltage comparator compares the reference voltage with a second ramp voltage signal which is generated by offsetting the first voltage ramp signal so that the second ramp signal parallels and leads the first voltage ramp signal by an offset voltage difference. The second voltage comparator produces a second output signal when the second ramp signal equals the reference voltage. Alternatively, the second output signal can be produced by offsetting the reference voltage signal and comparing it to the voltage ramp signal in the second comparator. The first and second output signals provide atrial and ventricular timing signals. The ventricular rate is controlled by adjusting the relationship of the reference voltage and the first voltage ramp signal. The atrial-ventricular delay is independently controlled by adjusting the amount of the offset voltage.
348590
Medtronic Inc.
Smart & Biggar
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