A receiving part is provided for receiving a rod for coupling the rod to a bone anchoring element, the receiving part including a receiving part body (5) with a rod receiving portion (9) with a channel (12) for receiving the rod, and a head receiving portion (16) for accommodating a head (3) of the bone anchoring element, the head receiving portion (16) having an open end (17) and being flexible so as to allow introduction and clamping of the head a locking ring (8) embracing a head receiving portion, wherein the locking ring exerts a force onto the head receiving portion to lock the head therein and a pre-locking ring (80) embracing the head receiving portion wherein the pre-locking ring exerts a force onto the head receiving portion so as to clamp the head in a pre-locking condition.本案提供一種容納件,可供容納桿件,把桿件聯結於骨骼固定元件,此容納件包含:容納件本體(5);具有桿件容納部(9),含有容納桿件用之凹溝(12);和頭部容納部(16),可包容骨骼固定元件之頭部(3),頭部容納部(16)有開口端(17),具有撓性,容許引入和夾持頭部;鎖環(8),包圍頭部容納部,其中鎖環施力於頭部容納部,把頭部鎖定於其內;以及預鎖環(80),包圍頭部容納部,其中預鎖環施力於頭部容納部,在預鎖狀態下夾持頭部。3...骨骼固定元件頭部5...容納件本體8...鎖環9a...桿件容納部第一端9b...桿件容納部第二端16...頭部容納部18...空心段20...開縫21...凸部80...預鎖環P1...鎖環第一位置
