| 摘要 |
A surgical instrument comprises a first member extending distally from a proximal end and having an opening in a distal region for admitting tissue, and a second member disposed within the first member for moving a cutting implement and causing it to cut tissue that is exposed to the implement through the opening. A knob is attached to the proximal end of the first member and is mounted in rotatable engagement with a hub of the instrument to rotate the first member and selectively change a rotational orientation of the opening with respect to the hub. The knob is axially movable with respect to the hub to a locked position in which the knob nonrotatably engages the hub. |
