Abstract: A probe is provided for a pacemaker which is associated by one of its end portions with the pacemaker and by its opposite end portion with the auricle and the ventricle of the heart. It comprises two conductors which form a one-piece assembly and which are associated with each other by means allowing them to slide axially with respect to each other, namely two tubes or sleeves fitting one into the other and movable with respect to each other. An annular space is provided between said tubes.

Abstract: In order to determine parameter values of an implanted programmable pacemaker, each parameter value is assigned a time .DELTA.T which is a fraction of the pacing period T in the magnetic mode. In a pair of successive pacing intervals with the combined duration of 2T, one interval is shortened and the other lengthened by the amount .DELTA.T. With the pacemaker in the magnetic mode, the parameter value is identified by observing the position of the middle pulse in the double interval 2T.

Abstract: This cardiac stimulator comprises a sealed metal case (2), means for generating electric direct current which are electrically connected to at least one electronic circuit (13) adapted to deliver heart-stimulating pulses, the current generating means, comprising an anode (3), a cathode (4) and an electrolyte, being disposed directly in the case (2). The electronic circuit (13) is enclosed in a sealed cell (12) provided with an output terminal (14) for electrically connecting an electrode (14') and another terminal (15) for electrically connecting one of the anode and cathode poles (3, 4). This stimulator has a low weight and reduced over-all dimensions.

Abstract: A process of regulating by an extra-corporeal control unit an implanted cardiac stimulator comprising a pulse generator and a pair of electrodes, comprises controlling the stimulator so that it functions at a fixed rhythm independent of normal cardiac rhythm and detecting by the extra-corporeal unit successive pulses emitted by the stimulator. After each of selected stimulator pulses detected, and during the whole period between successive stimulator pulses, a train of successive control pulses is transmitted by the control unit and is received by the stimulator as binary information "1". On the contrary, no train of successive control pulses is transmitted during the whole period between other successive stimulator pulses and this is received as binary information "0". The binary information thus received is used to regulate the operation of the stimulator. The extra-corporeal unit displays the pulses emitted by the stimulator to verify that the regulator is effective.