A variable-length member provided to allow changes of length of the variable length member in one direction, to prevent changes in the length of the variable length member in the opposite direction, the ratchet mechanism having an operating configuration, 2 and a capable of pivoting of the mounting member around the pivot axis above Tsu, the polyaxial joint mounting member for mounting the bone variable length member, comprising a variable length member, ratchet spinal devices. [Selection] Figure Figure 1一方向における可変長さ部材の長さの変更を可能にし、逆の方向における可変長さ部材の長さの変更を防止する、作動構成を有するラチェット機構を備える可変長さ部材であって、2つ以上の枢動軸を中心とする装着部材の枢動が可能な、可変長さ部材が骨に装着するための多軸関節装着部材を備える、可変長さ部材を備える、ラチェット式脊椎デバイス。【選択図】図1
