US Patent 12089879 Internal fixation member set and internal fixation member

An internal fixation member set includes an internal fixation member, an inner member, and an outer member. The outer member has a first opening and a second opening, and rotatably retains a head of the inner fixation member. The inner member is inside the outer member and movable between a first position farther from the head and a second position nearer the second opening than the first position. The head has a first rotation range with the inner member at the first position and a second rotation range with the inner member at the second position. The second rotation range is smaller than the first rotation range with an interference between interference parts. A reference rotational position at which the head is insertable into or extractable from the outer member is included in the first rotation range and is not included in the second rotation range.