A surgical access port that includes a cylindrical member having a proximal end and a distal end and defining a longitudinal axis; at least two lumen extending through the cylindrical member along the longitudinal axis; at least one cavity defined in the cylindrical member and positioned radially within the at least two lumen; and a source of inflation fluid coupled to the at least one cavity, the source of inflation configured to permit selectable inflation of the at least one cavity, whereby inflation of the at least one cavity increases the radial distance between the at least two lumen.