| 摘要 |
<p>An apparatus for surgical instrument location comprises a generally cylindrical tube ( 10,12,14 ) one end of which preferably includes teeth ( 20 ) for securing the tube to an area of bone to be prepared for an implant. An insert ( 60 ) fits within the tube and has a longitudinal aperture ( 64 ) the lateral edges of which define an operational area for an instrument inserted through the aperture. Means are provided for selectively positioning the aperture at a desired longitudinal and rotational position within the tube. An outer end ( 66 ) of the aperture is shaped, and forms a camming surface which, in co-operation with a cam follower on the surgical instrument, varies the longitudinal position of the instrument within the tube as the instrument is moved laterally across the operational area. Different sizes and shapes of tube may be provided, along with different inserts for each tube, allowing the surgeon to select an appropriate combination. The apparatus provides an inexpensive passive guidance system for use in minimal access surgery. The apparatus further protects surrounding tissues from debris.</p> |
