The present invention discloses a ring, embedded in a bone plate for fixing the relative position of a bone screw and the bone plate. The ring has a sidewall and the sidewall has a plurality of gaps. The ring further comprises a lower holding portion and an upper holding portion, the lower holding portion and the upper holding portion are utilized to hold the ring on one of the surface of the bone plate and the corresponding surface thereof respectively. The present invention is capable of fixing the screw to the through hole of the bone plate in various directions or angles so as to prevent the bone screw from passing through the joint, the smashed area or the area of severe osteoporosis thereof. Furthermore, the present invention is easy to operate, capable of avoiding damage and decreasing the trouble for the operator thereof.本創作揭露一種套環,嵌接於一骨板,用以固定一骨釘與骨板的相對位置,套環具有一側壁,側壁具有複數個空隙。套環進一步包含有一下抵持部以及一上抵持部。上抵持部以及下抵持部係分別抵持於骨板的一表面以及相對應的另一表面。本創作使得骨板之單一樞孔內能提供多方向及多角度的鎖入,使骨釘能以最佳角度鎖入,避免貫穿關節及避開粉碎區域或嚴重骨質疏鬆區,且容易操作並能避免裝置破損,進而減少對醫務人員的困擾。
