Dual chamber pacemaker with adjustable blanking and V-A extension
First Claim
1. A dual chamber cardiac pacemaker comprisingmeans for detecting a maximum ventricular heart rate,means for detecting an atrial event during a relative atrial refractory period, andmeans responsive to the heart rate detecting means and to the atrial event detecting means for extending a ventricular-atrial delay period.
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Accused Products
Abstract
A dual chamber pacemaker with variable V-A delay based on detection of multiple criteria before lengthening the V-A delay period. Before the V-A delay period can be extended, the pacemaker must be stimulating the ventricle at a maximum ventricular rate, and an atrial event must be sensed in a relative atrial refractory period. During this interval the pacemaker would not respond to an atrial event that was sensed, but the occurrence of the event would be detected. To optimize a ventricular blanking period, in each cardiac cycle, the energy level of the atrial output pulse and the sensitivity of the ventricular sense amplifier are sampled. Based on these dynamic parameters, the duration of the ventricle blanking period is adjusted for each cycle so that a minimum ventricular blanking period can be maintained without cross-talk.
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Citations
19 Claims
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1. A dual chamber cardiac pacemaker comprising
means for detecting a maximum ventricular heart rate, means for detecting an atrial event during a relative atrial refractory period, and means responsive to the heart rate detecting means and to the atrial event detecting means for extending a ventricular-atrial delay period.
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11. A dual chamber cardiac pacemaker comprising
means for delivering pulses to at least a first chamber of the heart, means for determining the magnitude of pulses delivered by the pacemaker to the first chamber of the heart, amplifier means for sensing events in a second chamber of the heart, means for determining gain of the amplifier means, and means responsive to the magnitude determining means and to the gain determining means for adjusting a blanking period of the amplifier means for the second chamber of the heart, said blanking period adjusting means further comprising first means responsive to the magnitude determining means for making a first adjustment to the blanking period, and second means responsive to the gain determining means for making a second adjustment to the blanking period.
Specification