A bone anchoring device (1) is provided that includes an anchoring element (2) having a shaft (3) for anchoring in the bone and a head (4), a receiving part (5) having a top end (51) and a bottom end (52), a recess (55) for receiving a rod (20) therein, a coaxial bore (53) extending from the top end (51) in the direction of the bottom end (52) and a seat (54) for receiving the head near the bottom end (52)； a pressure element (6) which is movable within the bore (53) and an element (8) made of a polymer material which is arranged between the head (4) and the pressure element (6). The bone anchoring device (1) is provided for improved handling during surgery and to be manufactured in a simple manner. The head (4) is pivotable with respect to the receiving part (5) and can be fixed at an angle by exerting pressure via the pressure element (6) onto the head (4), and wherein the pressure element (6) can assume a first position in which the element (8) and the pressure element (6) are in direct contact such that the pressure element (6) exerts a preload force onto the head (4) via the element (8) in which the head (4) is maintained at an angular position by friction before locking the head (4).本案提供一種骨骼固定裝置(1)，包含固定元件(2)，有固定於骨骼內之軸部(3)，和頭部(4)，容納件(5)，有頂端(51)和底端(52)，凹部(55)，可供容納桿件(20)，共軸腔孔(53)，從頂端(51)按底端(52)方向延伸，和支座(54)，可在底端(52)附近容納頭部(4)；壓力元件(6)，可在腔孔(53)內移動；和聚合物材料製之元件(8)，配置在頭部(4)和壓力元件(6)之間。本案提供骨骼固定裝置(1)，可以簡單方式，改進在手術之際或在製造中之處理。頭部(4)可相對於容納件(5)樞動，並可經壓力元件(6)對頭部(4)施壓，而固定於某一角度，其中壓力元件(6)可佔有第一位置，此時元件(8)和壓力元件(6)可直接接觸，使壓力元件(6)經由元件(8)對頭部(4)施以預負載力，在頭部(4)鎖定之前，利用摩擦把頭部(4)維持在一角度位置。
