| 主权项 |
1. A device for creating endoscopic operating space, the device comprising:
an external cannula; an internal cannula disposed in the external cannula; an expandable retractor disposed at a distal end of the device and cooperable with the external cannula and the internal cannula, the expandable retractor being displaceable between an unexpanded position and an expanded position; an actuator cooperable with the expandable retractor, the actuator displacing the expandable retractor between the unexpanded position and the expanded position, wherein the internal cannula is displaceable longitudinally relative to the external cannula, and wherein the actuator displaces the internal cannula relative to the external cannula to thereby displace the expandable retractor between the unexpanded position and the expanded position; and wherein the expandable retractor comprises a plurality of extensions secured to a distal end of the internal cannula, a cap secured over a distal end of the external cannula and having through holes through which the plurality of extensions are movable, and a membrane positioned over the cap, wherein in the unexpanded position, distal ends of the extensions are positioned flush with or adjacent the cap and the membrane is collapsed, and wherein in the expanded position, the internal cannula is longitudinally displaced relative to the external cannula, the extensions are positioned through the through holes, and the membrane is expanded and covering the extensions. |
