In an obturator comprising a forwardly tapered male plug with {HEAD ~ a shaft} extending from {TAIL ~ the forward end} thereof, said plug including locking means for releasable engagement with projecting dogs on a catheter fitting having an inwardly tapered smooth female portion upon insertion of the obturator into the catheter fitting, the improvement comprising: 
extending from
In an obturator comprising a forwardly tapered male plug with { HEAD ~ a shaft } extending from { TAIL ~ the forward end } thereof , said plug including locking means for releasable engagement with projecting dogs on a catheter fitting having an inwardly tapered smooth female portion upon insertion of the obturator into the catheter fitting , the improvement comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH