A safety catheter needle comprises a cannula removably inserted in a catheter and associated with a cannula holder, said catheter associated with a catheter holder being in turn removably attached to said cannula holder, the cannula having a distal extremity or tip comprising a deformed part and provided with a protection device associated with the catheter holder movably containing the cannula and moving within the catheter holder when the cannula is drawn out from the catheter. The protection device comprises a principal body containing a moving body rotating about an axis at right angles to a longitudinal axis of the cannula and capable of interacting with a fixed part of the catheter holder while the cannula is being drawn out, said interaction bringing about rotation of the rotating moving body within the principal body and immobilising the distal extremity of the cannula within the former.
