“…Tantalum wire mesh has been popular since it is easily shaped and trimmed to suit each individual case (Rob and Bateman, 1949, Edgerton, 1952, Ashley et al, 1955. Another surgeon has recently been using woven nylon as a suitable stent (Conley, 1955). But polyethylene tubing has probably been most widely employed since it is both easily trimmed and provides a more satisfactory mechanical support (Owen, 1952;Cade, Reidy et al, 1953;Negus, 1953).…”