| 摘要 |
A Maryland dissectors for insertion through a 5 mm trocar tube is disclosed and generally includes a hollow extended aluminum tube, a clevis, a pivot pin, a push rod, Maryland dissector end effector blades, and an actuator for causing reciprocal motion of the push rod. The clevis fixedly engages a first end of the aluminum tube, with the clevis having a hollow bore communicating with the aluminum tube and a pair of parallel, spaced apart, opposed arms extending away from the aluminum tube. The pivot pin extends transversely between the arms of the clevis and engages the clevis arms. The Maryland dissector end effector blades extend away from the aluminum tube and curve away from the longitudinal axis of the aluminum tube. The pivot pin extends through through-holes in the blades which are sized to permit pivotal movement of the blades around the pivot pin and to permit limited angular displacement of the blades relative to the pivot pin. When the Maryland dissector instrument is inserted through the 5 mm trocar tube, the blades angle relative to the pivot pin, and the aluminum tube resiliently flexes. When the blades pass out of the trocar tube the aluminum tube reassumes an unstressed position, and the blades can assume a position perpendicular to the pivot pin, with the blades extending past the projected periphery of the trocar tube.
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