Surgical seal

A seal for laparoscopic port comprising: a base adapted to engage a cannula, the base including an axial aperture for a surgical instrument; a multiplicity of jaws mounted on the base, the jaws being movable radially with respect to the aperture between an open position wherein a shaft of the surgical instrument may pass freely and a closed position wherein the jaws engage said shaft and provide a restraining force restraining radial movement of the shaft; and an actuator rotatable to urge the jaws to move between said open position and said closed position; wherein the actuator includes a click stop arrangement adapted to provide frictional engagement at a position intermediate the open and closed positions to hold the jaws at the intermediate position