An infusion pump includes a housing. The housing includes a tube port adapted to receive an intravenous (“IV”) tube. The tube port includes a tube channel and a rib. The tube channel has an inlet and an outlet end. The rib is positioned along the channel adjacent the outlet end. The rib is formed to extend towards the tube when the tube is passed through the tube port thereby indenting the tube and tending to prevent full occlusion of the tube. The tube port may also include a plurality of ribs positioned around a perimeter of the tube port on the exterior side of the housing. The plurality of ribs are configured to prevent an occlusion in the tube when the tube is bent on the exterior side of the housing.