Medical device for use in pain therapy

A method for distance monitoring of an electrode during pain therapy by electrical neurostimulation, the method comprising the steps of:

• generating an electrical monitoring signal with a signal generator of a medical device;
• emitting the electrical monitoring signal via an electrode, the electrode connected to the signal generator of an invasive component of the medical device, the electrode arranged at a distance from a nerve, and the electrical monitoring signal triggering a motor reaction and/or a sensory reaction with action on the nerve, a form of the motor reaction and/or the sensory reaction depending on the distance from the nerve;
• detecting the form of the motor reaction and/or the sensory reaction by a detection apparatus of the medical device and/or by medical personnel;
• monitoring the distance from the nerve depending on the form of the motor reaction and/or the sensory reaction.