| 摘要 |
To avoid traditional muscle dissection required in the placement of a screw for a pedicle screw fixation, a retractor (10)is provided having a guide (14 ) of an appropriate length to provide access form the skin surface to the dors al aspect of the vertebra over the pedicle. The retractor (10) has a handle(12) to provide appropriate holding leverage and to maintain the guide (14) so as to stabilize the guide(14) against the lateral aspects of the facet with the paraspinous musculature. The retractor(10) has a channel(22) of an appropria te size to accomodate a variety of tools, including a drill bit or a tap(33). T he channel(22) also provides a pathway for a probe(30) or feeler to inspect the placement of the screw. |
