Endosteal guide pin, positioning trocar and trocar for removing said pin

A trocar for positioning an endosteal guide pin, wherein it includes a first part comprising the guide pin, said pin including a head intended to be provisionally implanted in a bone, and a guide rod, coaxial with and rigidly connected to the head, ending in a free end, and adapted such that it is at least flush with the skin surface of the patient when the pin is in the implanted position in the bone, the positioning trocar further comprising a second hollow part to which the first part is coupled in a removable manner by means of a rigid connection system including a first coupling means provided on said pin and a cooperating coupling means provided on the positioning trocar, the guide rod of the guide pin being fitted inside the hollow part such that it slides, and the pin including a second coupling means intended at least to ensure the rigid connection thereof to a removal trocar, and wherein the removable rigid connection system further includes a rotation locking element provided on the head of the pin and a cooperating locking element provided in the hollow part of the trocar in order to prevent rotation of the guide pin relative to the hollow part of the positioning trocar around the axis of said positioning trocar.