A receiving part for receiving a rod for coupling the rod to a bone anchoring element is provided, the receiving part including a receiving part body (555") 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 and a locking ring (880800) embracing the head receiving portion, wherein the locking ring exerts a force onto the head receiving portion to lock the head therein wherein the locking ring (880800) includes a spring portion (8390100) which cooperates with a portion (930314142) of the receiving part body so as to clamp the head in a pre-locking condition.本案提供一種容納桿件用之容納件,供桿件聯結於骨骼固定元件,容納件包含:容納件本體(5;5;5");具備桿件容納部(9),有凹溝(12)供容納桿件;和頭部容納部(16),供包容骨骼固定元件之頭部(3),頭部容納部(16)有開口端(17),呈撓性,容許引進和夾持頭部;以及鎖環(8;80;800),包圍頭部容納部,其中鎖環對頭部容納部施力,把頭部鎖定於其內;其中鎖環(8;80;800)包含彈簧部(83;90;100),與容納件本體之一部份(9;30,31;41;42)合作,把頭部夾持於預鎖定狀態。3...骨骼固定元件之頭部6...桿件8...鎖環9...桿件容納部16...頭部容納部21...凸部30...凹部31...肩部81a...斜縮內表面83...鎖環之第三部P2...預鎖定位置
