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发明授权
CN104783886B 低切迹螺钉座及定位压环的装配方法 有权

低切迹螺钉座及定位压环的装配方法
摘要：
一种低切迹螺钉座，涉及骨科手术用椎弓根螺钉技术领域，特征在于卡合凸起的上方设有容纳定位压环限位凸环的凹槽，其内径大于定位压环的限位凸环直径；置棒槽左右两侧的环体上部设有向外凸起、与卡合凸起相配合的限位凸环，限位凸环上侧或下侧的环体外壁上设有向外凸起的防转凸块，卡合凸起上设有与防转凸台相配合的防转卡槽。其安装方法是：将定位压环的限位凸环与两个U形槽相对的由装配孔上方向下装入钉座主体内的内螺纹和卡合凸起之间的凹槽时，转动定位压环至钉座主体内壁上的内螺纹和卡合凸起之间的凹槽内、防转凸台与防转卡槽相对处，向下冲压定位压环。本发明具有直径小、低切迹等优点。
摘要（英）：

The low profile screw base comprises a screw base body and a positioning compression ring. An assembly hole penetrates longitudinally through the screw base body. A U-shaped slot for a connecting rod to pass through is provided on an upper portion of the screw base body. The inner wall of the screw base body on the opposite sides of the U-shaped slot is provided with internal threads. Snapping protrusions are formed on the inner wall of the screw base body on the opposite sides of the U-shaped slot below the internal threads. A lower ball socket matched with the round head of the ball screw is arranged in the assembly hole of the lower portion of the screw base body. The positioning compression ring used for compressing the round head is snap fitted above the lower ball socket and below the snapping protrusions (6).

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