A method for visualizing the interior of a bodily passageway, comprising providing a visualization system comprising a tube having a distal and a proximal end, at least a portion of the distal end being rotatable visualization apparatus disposed within the system and a helical thread disposed on the exterior surface of the rotatable portion of the tube, the helical thread having a sufficient structural integrity and surface profile, such that when the tube is disposed in the passageway and the helical thread engages the wall of the passageway, rotation of the rotatable portion of the tube induces a relative movement between the tube and the wall of the passageway inserting the system into the passageway rotating the rotatable portion of the tube so as to bring together a site which is to be visualized and the visualization apparatus and using the visualization apparatus to visualize the interior of the passageway.
