| 摘要 |
A spinal fixation system includes an elongated spinal rod (R) and a number of vertebral fixation elements (10), each including a vertebra engaging portion (11) and a rod engaging portion (13) formed by a pair of posts extending from the vertebra engaging portion. The vertebral fixation elements are engaged to the spinal rod each by way of a top-loading clamp (20) that permits access directly from the top of the instrumentation site for tightening the system. The clamp includes a body (21) defining an elongated bore (22) configured to receive the spinal rod (R) therethrough and a pair of threaded bores (29) from opposite top and bottom surfaces of the body, each intersecting the rod bore (22). The clamp further includes a projection (24) extending from the body terminating in a T-bar (26) having a clamping surface (27) directed inwardly toward the elongated bore configured to engage the pair of posts (14) of the vertebral fixation element (10). A set screw (30) is threaded into one of the threaded bores (29) to bear against the spinal rod disposed within the rod bore.
|
