elongate notches where portions of the malleable cannula 316 are shaved or otherwise cut back to expose semi cylindrical channel regions 330 a and 332 a each of which is an extension of a respective one of the fluid carrying lumens 330 332 the notches each extend axially along the malleable cannula 316 from a distal end wall 400 of the malleable cannula 316 to a stop wall 402 spaced axially inwardly i e proximally of the distal end wall 400 the semi cylindrical channel regions 330 a 332 a are each bounded along their lateral edges by alignment ledges 404 406 408 410 also illustrated in fig1 and 20 extending to the outer perimeter of the malleable cannula 316 the third and fourth lumens 334 362 run between the alignment ledges 404 408 and 406 410 with the remaining portion of the malleable cannula 316 that surrounds the third and fourth lumens 334 362 along the notches and defining the semi cylindrical channel regions 330 a 332 b forming a male projection 370 of the malleable cannula 316 the male projection 370 is received in a female mating port 379 as illustrated in fig1 of the tip insert 348 like the triangular tip insert 128 the tip insert 348 includes structural features to direct fluid from the fluid carrying lumens 330 332 of the malleable cannula.