The reported tunneler consists of a flexible grasping forceps threaded through a 7.5-mm inside diameter Teflon tube, the distal end of which is covered by a bonnet to render its insertion atraumatic. It can be applied to advantage in most areas of the body.
Parsonnet V, Driller J. A Tunneler for Bypass Vascular Surgery. Arch Surg. 1973;106(2):236-237. doi:10.1001/archsurg.1973.01350140092028