Abstract: A combination for accessing a body conduit includes a trocar for creating a hole into the body conduit. A cannula included in the trocar has a cylindrical wall with an outside diameter and an inside diameter. An elastomeric tube having a channel extending between a proximal end and a distal end is movable between a normal state wherein the tube has a first outside diameter greater than the outside diameter of the cannula and a stretched state wherein the tube has a second outside diameter less than the inside diameter of the cannula. A stylet having a length longer than the length of the tube in the normal state engages the tube at its distal end and is operable to move the tube from the normal state to the stretched state permitting the tube to be inserted into the cannula and through the cannula into the body conduit.