A coupling assembly is provided for coupling a rod to a bone anchoring element, the coupling assembly (4, 4, 4") comprising a receiving part (5, 5") having a first end (5a), a second end (5b) and a central axis (C) extending through the first end (5a) and second end (5b), a recess (52) for receiving a rod (100), and an accommodation space (54) for accommodating a head (3, 3) of an anchoring element (1), the accommodation space having an opening (55) at the second end (5b) sized so as to permit the insertion of the head (3, 3) and a bore (51) extending from the accommodation space to the first end (5a), a retainer element (6, 6, 6") configured to be positioned at least partially in the accommodation space (54) and sized so as to at least partially encompass an inserted head (3, 3) a spring element (7, 7"), separate from the retainer element (6, 6, 6"), configured to be arranged at least partially in the accommodation space (54), wherein the spring element (7, 7") is configured to be compressed in the axial direction and wherein the spring element (7, 7") has such a length in the axial direction that it can be engaged by an inserted rod when the retainer element (6, 6, 6") and the spring element are arranged in the accommodation space (54).本案提供一種聯結桿件於骨骼固定元件用之聯結總成,該聯結總成(4,4,4")包括:一容納件(5,5"),具有一第一端(5a)和一第二端(5b),以及延伸貫穿該第一端(5a)和該第二端(5b)之一中心軸線(C);一凹部(52),供容納一桿件(100);和一包容空間(54),供包容一固定元件(1)之一頭部(3,3),該包容空間在該第二端(5b)具有一開口(55),其尺寸可容許該頭部(3,3)插入,並有一腔孔(51),從該包容空間延伸到該第一端(5a);一扣持元件(6,6,6"),構成至少部份定位於該包容空間(54)內,其尺寸至少部份涵蓋一插入頭部(3,3);一彈簧元件(7,7"),與該扣持元件(6,6,6")分開,構成至少部份配置於該包容空間(54)內;其中該彈簧元件(7,7")構成按軸向被壓縮;且其中該彈簧元件(7,7")在軸向有一長度,當該扣持元件(6,6,6")和該彈簧元件配置於該包容空間(54)內時,可被一插入桿件結合。1‧‧‧骨骼固定元件2‧‧‧幹部3‧‧‧頭部3a‧‧‧球形截面外表部3b‧‧‧凹部4‧‧‧聯結總成5‧‧‧容納件5a‧‧‧容納件第一端5b‧‧‧容納件第二端6‧‧‧扣持元件7‧‧‧彈簧元件8‧‧‧銷件9‧‧‧鎖定元件52‧‧‧U形凹部54‧‧‧包容空間64‧‧‧環形邊緣66‧‧‧開縫圈100‧‧‧桿件C‧‧‧中心軸線E‧‧‧最大直徑
