| 摘要 |
A surgical drill wherein a driven spindle is formed with an axial through bore and accommodates an axially movable clamping member which can either engage or release an elongated drilling tool. A nut is employed to move the clamping member between a first axial position in which the clamping member receives torque from the spindle and rotates the tool, and a second axial position in which the tool can be shifted axially of the clamping member and spindle so as to move a desired length of the tool beyond the spindle, to wit: a length which is sufficient to permit deeper penetration into a bone or the like but not enough to permit uncontrolled flexing of the tool. The axial length of the toll may exceed several times the axial length of the spindle.
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