A polyaxial bone anchoring device is provided comprising an anchoring element (1) having a shank (2) for anchoring in the bone and a head (3), the head having a spherically-shaped outer surface portion (3a) a receiving part (4) configured to be pivotably connected to the head (3), the receiving part (4) having a top end (4a) and a bottom end (4b), a central axis (C) extending through the top end and the bottom end, a transverse channel (52) for receiving a rod (100) and an accommodation space (44) for accommodating the head (3), the accommodation space (44) having a lower opening (45) at the bottom end (4b), a sleeve-like insert piece (5) having a sleeve axis (S) and configured to be positioned around a portion of the head (3) and to pivot in the receiving part (4), the insert piece (5) comprising a spherically-shaped outer surface portion characterized in that the sleeve-like insert piece (5, 5) comprises at least a first part (510, 510) and a second part (520, 520) that are connected together through a guiding structure (51) that permits the first part (510, 510) to move relative to the second part (520, 520) only in a direction transverse to the sleeve axis (S).本案提供一種多軸式骨骼固定裝置,包含:一固定元件(1),具有一幹部(2),供固定於骨骼內,和一頭部(3),該頭部具有一球形外表面部(3a);一容納件(4),構成以樞動方式連接於該頭部(3),該容納件(4)具有一頂端(4a)和一底端(4b),一中心軸線(C)延伸貫穿該頂端和該底端,一橫向槽溝(52),供容納一桿件(100),和一包容空間(44),供包容該頭部(3),該包容空間(44)在該底端(4b)具有一下開口(45);一套筒狀插件(5),具有一套筒軸線(S),構成位於該頭部(3)一部份之周圍,並在該容納件(4)內樞動,該插件(5)包括一球形外表面部;其特徵為,該套筒狀插件(5,5)包括至少一第一組件(510,510)和一第二組件(520,520),透過一導引結構(51)連接在一起,容許該第一組件(510,510)僅在橫越該套筒軸線(S)之一方向,相對於該第二組件(520,520)運動。2‧‧‧幹部3‧‧‧頭部4‧‧‧容納件4a‧‧‧容納件頂端5‧‧‧套筒狀插件5a‧‧‧套筒狀插件頂端5b‧‧‧套筒狀插件下緣6‧‧‧壓力構件7‧‧‧固定螺釘44a‧‧‧包容空間第一段54‧‧‧斜縮部55‧‧‧凹部65‧‧‧凹溝100‧‧‧桿件C‧‧‧中心軸線L‧‧‧縱軸線
