| 摘要 |
A trocar (800) for use in a minimally invasive surgical procedure includes an elongated body, nozzle means (835) and means for delivering a pressurized flow of fluid to the nozzle means. The elongated body has a generally tubular configuration with coaxially arranged inner (840) and outer (810) walls and longitudinally opposed proximal and distal end portions, with the inner wall (840) defining a lumen to accommodate passage of an instrument (490) therethrough. The nozzle means (835) is operatively associated with the inner wall (840) of the body for directing pressurized fluid into the lumen to develop a pressure differential in an area within a region extending from a location adjacent a distal end portion of the lumen to a location adjacent a proximal end portion of the lumen, to form a fluid seal around an instrument (490) passing therethrough. |
