Patent ID: 8690925

Claim:
A locking device for securing a rod-shaped element in a receiving part of a bone anchor, the locking device comprising: a first locking member comprising a first end, a second end, a central axis passing through the first end and the second end, an outer surface with an external thread, a coaxial bore passing through the first locking member, and an internal thread provided along at least a portion of the bore; and a second locking member comprising a first end, a second end, and an outer surface with an external thread configured to cooperate with the internal thread of the first locking member, wherein when the second locking member is positioned in the first locking member, the second locking member is movable along the central axis by rotating the second locking member relative to the first locking member, wherein movement of the second locking member is limited towards the first end of the first locking member by a first stop and towards the second end of the first locking member by a second stop, and wherein at least one of the first stop or second stop is arranged in the bore of the first locking member.