| 摘要 |
<p>A surgical instrument for accessing first and second pedicle locations of a spinal column area includes a blade member (20) slidably positionable along first and second wires (14, 16). The instrument has a nested arrangement (12) of members, including a portal member (18) having an elongated aperture (74) to access the first and second pedicle locations. The nested arrangement further includes a plurality of members (24, 26) configured and sized to incrementally expand the access opening to the spinal column area.
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