| 摘要 |
A fixing instrument for spinal surgery comprises two units (1,36) which by means of bone screws (6,7) each may be secured to a vertebra. One of these units (1) includes a block (2) having two rotatably mounted bone screws (6,7) which by means of special locking means (16) are secured against turning after the bone screws have been screwed in. |
