| http://www.w3.org/ns/prov#value | - Other surgical instruments and implants, such as drills and bone screws for example, may be inserted and used through the cannula 90 to complete the surgical procedure. [0105] After the surgical procedure is completed, the retractor member 71 is once again grasped with a forceps or surgical pliers, and the cannula 90 is rotated to unscrew and remove the retractor member 71 from the cannula.
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