A programmable digital atrio-ventricular pacer is provided whereby a single programming circuit is utilized for providing program control signals for control of separate ventricular and atrial pacing circuits. The atrial stimulus circuitry is controlled by a multiple bit control signal to cause derivation...http://www.google.es/patents/US4192316?utm_source=gb-gplus-sharePatente US4192316 - Programmable atrio-ventricular pacer
