A coupling assembly is provided 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), the recess having a bottom, and an accommodation space (54, 54') for accommodating a head (3) of an anchoring element (1), the accommodation space having an opening (55, 55') at the second end (5b) sized so as to permit the insertion of the head (3) and a bore extending from the accommodation space to the first end (5a), a retainer element (6, 6') configured to be positioned a least partially in the accommodation space (54, 54') and sized so as to at least partially encompass an inserted head (3)； wherein the retainer element (6, 6') comprises at least one spring portion (66a, 66b； 66') that is compressible in an axial direction and that extends in an axial direction at least up to a position toward the first end (5a) of the receiving part that is higher than the bottom of the channel (52) for the rod.本發明係為一種聯結總成，包括一容納件(5,5')，具有一第一端(5a)、一第二端(5b)，及一中心軸(C)延伸通過第一端(5a)及第二端(5b)，一凹部(52)用以容納一桿件(100)，該凹部具有一底部，及一容納空間(54,54')用以容納一固定元件(1)之頭部(3)，該容納空間在第二端(5b)具有一開口(55,55')，其尺寸允許頭部(3)之插入，及一腔孔從該容納空間延伸至第一端(5a)，一保持元件(6,6')配置成至少部分定位於容納空間(54,54')中，其尺寸俾至少部分地環繞一插入之頭部(3)；其中保持元件(6,6')包括至少一彈簧部(66a,66b；66')，可軸向地壓縮，及朝容納件之第一端(5a)軸向延伸至少達到一位置比桿件通道(52)之底部高。
