Implantable cardiac pacemaker with automatic control of the connection of a probe and the implantation of the case

An active implantable medical device comprising:

• a case, said case comprising a generator and a power supply battery connected to the generator, said battery having an output current, and said generator producing stimulation impulses from said output current including monopolar stimulation impulses and bipolar stimulation impulses;
• a connector head connected to said case and equipped with at least two terminals capable of being connected to electrodes of a detection and stimulation probe, said probe capable of being a monopolar probe or a bipolar probe;
• and
• a circuit for detecting the presence of a probe connected to the connector, said circuit comprising:
• a battery consumption scanning circuit connected between the battery and the generator and coupled to the battery output current and having a resistor and an output corresponding to a measured value of the current;
• a first comparator having as a first input the measured value of the current over a first time interval and as a second input a pre-programmed threshold current value, and an output corresponding to a probe connected to said connector head terminals when said measured value of the current exceeds said pre-programmed threshold current value;
• and
• a detector circuit responsive to the measured value of the current not exceeding the pre-programmed threshold current value coupled to said at least two terminals and having an output signal responsive to a spontaneous depolarization detected at said terminals;
• a counter responsive to said detector circuit output signals for accumulating a count of detected depolarizations;
• and
• a second comparator having as a first input the accumulated count of detected spontaneous depolarizations and as a second input a pre-programmed counting threshold, and an output corresponding to a signal of suspicion of implantation in response to the accumulated count crossing the counting threshold.