For the purpose of firmly clamping a medical guide wire which can be rotated and displaced in a longitudinal opening of an accommodating body, a clamping mechanism is present either just at one end of the longitudinal opening or at each end of the longitudinal opening, the clamping mechanism having a widened opening region, which runs transversely to the longitudinal opening, and a clamping-member arrangement, which is connected to the accommodating body in an elastically flexible manner and has an edge part, which is located in the opening region and against which the guide wire, once pivoted out of the longitudinal opening, can be brought into abutment at the relevant end of the accommodating body and at the clamping-member arrangement, with the capability of the guide wire to be displaced and/or rotated being blocked in the process.
