Abstract: An anchor guide for a trocar comprising a tubular body, formed by a plurality of substantially circular sectors, moveable radially toward and away from a longitudinal axis of the tubular body between a first position where they flank one another, according to a first substantially circular arrangement with diameter generally equal to that of the tubular body, and a second position at which they are generally equidistant from one another, according to a second substantially circular arrangement of greater diameter than that of the first arrangement. Each sector is rotatably connected to a support element and a manual operation member is provided, moveably connected to the support element, for moving the sectors from the first to the second position and vice versa.

Abstract: An anchor guide for a trocar comprising a tubular body, formed by a plurality of substantially circular sectors, moveable radially toward and away from a longitudinal axis of the tubular body between a first position where they flank one another, according to a first substantially circular arrangement with diameter generally equal to that of the tubular body, and a second position at which they are generally equidistant from one another, according to a second substantially circular arrangement of greater diameter than that of the first arrangement. Each sector is rotatably connected to a support element and a manual operation is provided, moveably connected to the support element, for moving the sectors from the first to the second position and vice versa.

Abstract: A trocar for thoracic surgery, comprising a guide duct for surgical instruments adapted to be inserted in a body opening of access to the thoracic cavity. The duct is formed by a plurality of sectors arranged about its axis and articulated to a support frame. A sector expander is associated with the duct for opening the sectors from an initial insertion position in the body opening to a final maximum expansion position in which they are moved away from the axis to a greater extent than in the configuration assumed in the initial position. The expander includes a control ring nut movably connected to the sectors and the support frame such that rotation of the ring nut in one direction, results in the sectors movement away from the axis. Associated with the ring nut is a device for locking the rotation in the direction opposite that of the expansion direction.