Medical drill device and medical drill system

A medical drilling apparatus comprising:

• wherein each at least one mandrin entraining face comprises a planar surface
• a drill that is cannulated, the drill comprising a longitudinal channel extending coaxially with a longitudinal axis of the drill;
• a drilling apparatus coupling portion at a proximal end of the medical drilling apparatus, the drilling apparatus coupling portion configured for coupling to a handle or a drilling machine in a rotationally fixed manner;
• and
• a mandrin comprising a proximal mandrin portion and a distal mandrin portion,
• the distal mandrin portion configured for inserting into and closing the longitudinal channel of the drill over a length of the drill in a drilling position,
• the drill further comprising a drill proximal end, a drill distal end, and a drill coupling portion in a region of the drill proximal end, and
• the drill coupling portion and the proximal mandrin portion forming the drilling apparatus coupling portion,
• wherein the drill coupling portion has at least one drill entraining face extending parallel to the longitudinal axis, wherein the proximal mandrin portion has at least one mandrin entraining face extending parallel to the longitudinal axis, and wherein the at least one drill entraining face and the at least one mandrin entraining face abut against one another in face-to-face contact in the drilling position to thereby prevent relative rotation between the drill and the mandrin about the longitudinal axis, wherein each at least one mandrin entraining face comprises a planar surface.