The present invention discloses a device for surgery of stabilizing bone segments. The device includes a screw assembly, at least one supporting member, an extending member, and a fastening member. The supporting member connects to one of arms of a receiver of the screw assembly. The extending member includes a connecting part and at least one extending part. The connecting part is located at one end of the extending member opposite to the receiver. The extending part has a through hole. The extending part connects to the arms with that the supporting member passes through the through hole, and parts of the supporting member protrude from the extending part to the connecting part. The fastening member is sleeved on the connecting part, and has at least one pressing groove. The supporting member is located between the connecting part and the pressing groove. The pressing groove includes a releasing position and a pressing position for the supporting member. When the fastening member is rotated relative to the connecting part, the supporting member is moved between the releasing position and the pressing position along the pressing groove relative to the fastening member.本發明揭露一種用於穩定骨節段手術之裝置，其包括一螺釘組件、至少一支撐件、一延長件以及一鎖固件。支撐件連接於螺釘組件之一容置件的其中一側壁。延長件包括一連接部及至少一延長部。連接部位於延長件相對於容置件的一端。延長部具有一穿孔。延長部以穿孔穿過支撐件並連接於二側壁，且支撐件部分突出延長部至連接部。鎖固件套設於連接部，鎖固件具有至少一緊迫槽，支撐件位於連接部與緊迫槽之間。緊迫槽包括支撐件之一釋放位置及一緊迫位置。當鎖固件相對於連接部被轉動時，支撐件相對於鎖固件沿緊迫槽於釋放位置及緊迫位置之間移動。
