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    • 10. 发明授权
    • Polyaxial bone anchoring device
    • 多轴骨锚固装置
    • US09585698B2
    • 2017-03-07
    • US13618000
    • 2012-09-14
    • Lutz BiedermannWilfried MatthisMichael Kegel
    • Lutz BiedermannWilfried MatthisMichael Kegel
    • A61B17/70
    • A61B17/7037
    • A polyaxial bone anchoring device includes an anchoring element having a shaft and a head; a receiving part having a channel for receiving a rod therein, a coaxial bore and a seat portion for receiving the head; a pressure element having a head contacting surface portion; wherein the head is pivotable with respect to the receiving part and can be fixed at an angle by exerting pressure via the pressure element onto the head, and wherein the head has an oversize with respect to the head contacting surface portion such that an interference fit is achieved that clamps the head by the friction between the head and the head contacting surface portion. The curved outer surface portion has a largest diameter and the head contacting surface contacts the head at least in a region including the largest diameter.
    • 提供了一种多轴骨锚固装置,其包括具有用于锚固在骨中的轴(2)和头部(3)的锚固元件(1),所述头部具有弯曲的外表面部分; 具有顶端(5a)和底端(5b)的接收部分(5),用于在其中容纳杆的通道(12),在顶端(5a)的方向上延伸的同轴孔(51) 底端(5b)和用于在底端接收头部的座部(52); 布置在所述孔内的压力元件(6),所述压力元件具有接触所述头部的弯曲外表面部分的头部接触表面部分(62,63) 其中所述头部相对于所述接收部件可枢转,并且可以通过经由所述压力元件施加压力而以一定角度固定到所述头部上,并且其中所述头部在所述弯曲外表面部分中相对于所述头部接触表面部分具有过大尺寸 使得通过外表面部分和头部接触表面部分之间的摩擦来实现夹头。