A bone anchor (1, 101, 201), comprising: a main body defining a longitudinal axis (26) and comprising: a head (6, 106, 206) and a shank (2) at least one longitudinal recess (3, 103, 203) having a first end formed at the head (6, 106, 206) and a second end formed at the shank (2), the recess (3, 103, 203) extending from the first end through a portion of the head (6, 106, 206) and along a portion of the shank (2) to the second end, wherein the recess (3, 103, 203) is configured to receive therein a pin-shaped element (4, 104, 204) a stop (36) being provided at the second end of the recess (3, 103, 203), said stop (36) being configured to engage or abut a distal end portion (43) of the pin-shaped element (4, 104, 204) a locking structure (5, 105, 205) being provided adjacent the first end of the recess (3, 103, 203), said locking structure (5, 105, 205) being configured to engage and exert a biasing force on a proximal end portion (42, 142, 242) of the pin-shaped element (4, 104, 204) towards the stop (36) such as to stress and bend an intermediate portion (44) of the pin-shaped element (4, 104, 204) in a transverse direction (E) away from the shank (2).一種骨骼固定器(1,101,201),包括:一主體,界定一縱軸線(26),並包括:一頭部(6,106,206);和一幹部(2);至少一縱向凹部(3,103,203),具有形成於該頭部(6,106,206)之一第一端,和形成於該幹部(2)之一第二端,該凹部(3,103,203)從該第一端貫穿該頭部(6,106,206)之一部位,並沿該幹部(2)之一部份,延伸至該第二端,其中該凹部(3,103,203)構成容納一銷形元件(4,104,204);一止動部(36),設在該凹部(3,103,203)之該第二端,該止動部(36)構成結合或頂緊該銷形元件(4,104,204)之一末梢端部(43);一鎖定結構(5,105,205),設在鄰接該凹部(3,103,203)之該第一端,該鎖定結構(5,105,205)構成結合該銷形元件(4,104,204)之一基端部(42,142,242),並朝該止動部(36)施以一偏壓力,致使該銷形元件(4,104,204)之一中間部(44),按一橫向(E)背離該幹部(2),受到拉力和彎曲。1‧‧‧骨骼固定器2‧‧‧幹部3‧‧‧凹部4‧‧‧銷形元件5‧‧‧鎖定結構6‧‧‧頭部22‧‧‧骨骼螺紋23‧‧‧尖部24‧‧‧螺紋峰25‧‧‧螺紋根32‧‧‧凹溝部33‧‧‧鑽孔41‧‧‧銷部42‧‧‧基端部43‧‧‧末梢端部60‧‧‧截球形輪廓61‧‧‧頸部62‧‧‧平頂面63‧‧‧結合部
