| 摘要 |
Disclosed is a device (1) for creating a screw-shaped, especially a worm-shaped recess in a bone. In order to design a device (1) of said type which allows the recess to be quickly and safely introduced, a driving mechanism (3 to 9, 18 to 23) is proposed which applies torques (M1, M3) to the tool (13) via the shaft (9), said torques (M1, M3) extending in the direction of rotation of the tool (13). The first torque (M1) has an at least nearly constant quantity while the second torque (M3) is greater than the first torque (M1) and continuously changes the direction of rotation thereof when material is removed. |
