Abstract: An artificial cardiac pacemaker for use with a heart comprises an output feedback preventing circuit for applying stimulating output pulses developed by the pacemaker to a heart while preventing the pulses from being fed back into the pacemaker and for detecting cardiac signals from the heart. A selective converter circuit is connected to the output feedback preventing circuit and functions to convert negative cardiac signals from the heart into positive signals and apply the signals to a low pass filter circuit which filters the signals to eliminate high frequency noise. A resettable circuit for the refractory period is connected to receive the filtered signals and establishes a predetermined refractory period after each QRS signal from the heart and provides a corresponding trigger signal to a delay circuit which responds thereto to provide a trigger pulse after a predetermined time delay.

Abstract: System for detecting information in an artificial cardiac pacemaker by using energy supplied from the outside of the pacemaker. An energy supplying device supplies energy to the pacemaker from the outside. An energy receiving device in the pacemaker receives the energy. An energy changing device changes the received energy into information energy, according to the information from an information generating device. An information transmitting device transmits the information energy to the outside of the pacemaker.