An adapter (20) comprising a pair of rails (46) extending upwardly from a lower surface (38) and longitudinally in a direction from a long end (30) toward a short end (32) and converging to be parallel with the pair of edges (34) to define a third opening between the pair of rails (46) above the lower surface (38) for receiving the cannula (22) and stylet (24) transversely to the lower surface (38). An awning (48) positioned longitudinally between the first end and the second end and extending between and connecting the pair of rails (46) to define a first opening (42). The lower surface (38) defining a recess (50) disposed adjacent the short end (32) and extending from a second opening (44) into the channel (40) for receiving the flange (28) of the trocar (26) and defining a groove (52) for guiding the cannula (22) and the stylet (24) into the first opening (42). An indicia (54) extends from an upper surface (36) next-adjacent to the short end (32) to identify the second end for receiving the trocar (26).
