Locking device for an external fixator for bone fracture

A locking device (5) of a bone screw (3) for an external fixator (1) for bone fractures, the external fixator (1) comprising at least one support pin (202), wherein the locking device (5) comprises

• a locking element (501) of the bone screw (3);
• a locking pin (502), which is configured to support the locking element (501), the locking element (501) being configured to rotate around the locking pin (502) in a positioning step of the bone screw;
• a coupling element (503), which is provided with a respective coupling seat (503b) configured to receive the support pin (202) by snap-fit coupling and to allow, during the bone screw (3) positioning step, a rotation of the locking device (5) around the support pin (202) and a sliding of the locking device (5) along the support pin (202);
• wherein the locking device (5) comprises:
• a fixing element (504, 505, 506), which is configured to allow the rotation of the locking element (501) with respect to the locking pin (502), the rotation of the locking device (5) around the support pin (202) and the sliding of the locking device (5) along the support pin (202) during the positioning step and is further configured to allow the manual fixing of a position of the locking element (501) in the locking device (5) and the locking device (5) with respect to the support pin (202) in a fixing step, which follows said positioning step, to lock a configuration of the locking device (5) in the external fixator (1).