| 摘要 |
A bone screw (S1) comprises a threaded shank (10) having an axis of rotation . A head (14) is integral with the shank (10), and the head (14) includes a surface (20) disposed generally normal to the axis. A plurality of drive receivers (24) are disposed about the surface (20) wholly remote from the axis. Each of the drive receivers (24) is adapted for engagement with a cooperating driver element (44) of a rotary driver (D1) so that the head (14) and thereb y the shank (10) may be rotated about the axis.
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