Programmable cardiac pacemaker.

摘要

A programmable pacemaker apparatus having means for receiving programme information from an external source, means for generating and delivering stimulus signals, means for sensing the occurrence of natural heart-beats in a patient, and a battery source powering the apparatus. A microprocessor (50) combined with program instructions stored in a memory controls the operation of said pacemaker. A controller circuit means external to said microprocessor and interconnected therewith for controlling its operating state has means for determining the occurrence of given events. Said controller means further comprises means for stopping operation of said microprocessor on command from said microprocessor and for starting operation of said microprocessor upon determination of one of said events, whereby said microprocessor normally is on less than about 25 % of the time. The pacemaker offers selectable flywheel and overdrive modes.