Dual chamber pacemaker

Details Dual chamber pacemaker Dual chamber pacemaker

1983-02-11

1985-09-10

Kamm, William E.

Surgery

Truss

Pad

A61N 130

Patent

active

045399913

ABSTRACT:
An improved cardiac pacemaker adapted to be programmed into one of a plurality of given modes of operation, including dual chamber modes, and in particular synchronous operation for pacing the patient's ventricle following detection of natural atrial heartbeats. The pacemaker has means for monitoring the time relationship between delivered ventricular stimulus pulses and next succeeding atrial heartbeats, for determining the occurrence of pacemaker induced retrograde P waves, or pacemaker caused tachycardia. The timing, and thus the rate of sensed P signals is processed to determine the desirability of establishing a special P sense window for looking for the occurrence of P signals at rates above a normal maximum operating rate, in which event the stability of the V-A timing is monitored in accordance with predetermined criteria to determine the existence of pacemaker mediated tachycardia, which may be broken up by skipping a ventricular stimulus. During detection of atrial beats at a rate higher then the predetermined maximum operating rate, the synchronous ventricular stimulus rate is maintained at an average at or below the maximum rate, while maintaining a substantially constant A-V interval.

REFERENCES:
patent: 3903897 (1975-09-01), Woolons et al.
patent: 3942534 (1976-03-01), Allen et al.
patent: 4059116 (1977-11-01), Adams
patent: 4163451 (1979-08-01), Lesnick et al.
patent: 4421114 (1983-12-01), Berkovits et al.
patent: 4452248 (1984-06-01), Keller, Jr.

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