| 摘要 |
A surgical instrument for securing an anchor in a target area of the skull of a living subject to a predetermined driving depth. In one embodiment, the surgical instrument has a driver member, a bit member, a cap member that has a body portion forming a bore therein along a longitudinal axis, wherein inside the bore, a first inner surface is formed with an engagement length and a shape that is complimentary to a shaped surface of a driving engagement portion of the driver member to allow it to have a slidable engagement with the cap member, and a base member that has a body portion and an anchor engagement portion, wherein the engagement length of the first inner surface of the cap member equals the predetermined driving depth.
|
