| 摘要 |
The instrument has a tubular inner shaft arranged in a tubular outer shaft (16) with a longitudinal axis and a distal end (18). The inner shaft has a window (28) arranged in a region of another window (20) of the outer shaft, where the latter window is provided with a cutting element (30a). A fixing element is provided for torque-proof holding of the inner shaft relative to the outer shaft in a preset position. The fixing element is irreversibly detached by rotational movement of the inner shaft about the longitudinal axis relative to the outer shaft. |
