초록 ▼

A dual chamber pacemaker having an atrial escape interval which is varied on a beat-to-beat basis in response to the measured time from a ventricular event to the next atrial sensed event. Additionally, a portion of the atrial escape interval is bifurcated into a first sensing portion T1 and a secon

A dual chamber pacemaker having an atrial escape interval which is varied on a beat-to-beat basis in response to the measured time from a ventricular event to the next atrial sensed event. Additionally, a portion of the atrial escape interval is bifurcated into a first sensing portion T1 and a second sensing portion T2 wherein atrial sense events occurring during T1 may be ignored by the pacemaker, while atrial sense events falling within T2 are used to compute a new atrial escape interval and are used to resynchronize the pacemaker and are used to inhibit the otherwise scheduled atrial pace event.

대표청구항 ▼

In a pacemaker of the type having: (a) an atrial sense amplifier for producing atrial sense event signals (AS) in response to atrial depolarizations; (b) a ventricular sense amplifier for producing ventricular sense event signals (VS) in response to ventricular depolarizations; (c) an atrial pulse g

In a pacemaker of the type having: (a) an atrial sense amplifier for producing atrial sense event signals (AS) in response to atrial depolarizations; (b) a ventricular sense amplifier for producing ventricular sense event signals (VS) in response to ventricular depolarizations; (c) an atrial pulse generator for producing atrial stimulating pulses in response to atrial pace event signals (AP); (d) a ventricular pulse generator for producing ventricular stimulating pulses in response to ventricular pace event signals (VP); (e) timing means for timing V-A escape intervals and for generating said atrial pace event signals at the conclusion of said V-A escape intervals and for timing A-V escape intervals and for generating said ventricular pace event signals at the conclusion of said A-V escape intervals, said V-A escape intervals initiated by the occurrence of said ventricular pace event signals or said ventricular sense event signals, said A-V escape intervals initiated by the occurrence of said atrial sense event signals or said atrial pace event signals, the improvement wherein; (f) said timing means includes means for dividing each said V-A escape interval into a first time interval and a subsequent second time interval, said timing means initiating timing of said A-V escape intervals in response to the occurrence of said atrial sense events during one of said second time intervals, but not in response to the occurrence of a said atrial sense event signal during one of said first time intervals, said timing means including means responsive to one of said atrial sense event signals occurring within one of said second time intervals to decrease the duration of a subsequent one of said V-A escape intervals and the duration of said first time interval therein.