A medical apparatus for the introduction of catheters into the human body including: an ECG device having at least three electrodes, positionable on a human body for the detection of surface electrical potential data and adapted to provide at output at least one surface ECG strip； at least one catheter element having a distal ending part positionable inside the human body and having an auxiliary electrode element for the detection of intracavitary electrical potential data, associated with the ECG device for sending to the latter said intracavitary data, the ECG device being adapted to provide at output at least one intracavitary ECG strip；—an electronic device associated with the ECG device for the receipt of at least said intracavitary ECG strip and comprising a data processing module (10) adapted to process at least the intracavitary ECG strip to obtain usage information adapted at least to provide instructions on the insertion of the catheter element in the human body.
