Hypodermic syringe and needle assembly

Claim 1

Hypodermic syringe and transfer needle assembly, comprising a cylindrical hypodermic syringe barrel for receiving and holding a vial having a puncturable stopper sealing one end thereof and containing a medicament and the like therein, said barrel having an open end and a closed end, an annular, radially inwardly projecting sealing rib in the barrel adjacent the open end thereof, a plurality of axially extending, circumferentially spaced apart guide ribs on an inner surface portion of the barrel extending from the closed end thereof to the sealing rib, said barrel having a reduced diameter, axially outwardly extending hub on the closed end thereof, said hub having an axial bore therethrough with an enlarged diameter outer end portion, a plurality of axially extending splines in the enlarged diameter outer end portion, said transfer needle assembly having a reduced diameter, axially extending boss thereon adapted to be received in the bore through the hub, said boss having an inner end portion and an enlarged diameter outer end portion defining a shoulder with said inner end portion, a plurality of circumferentially spaced, axially extending splines on the enlarged diameter portion of the boss cooperably engageable with the splines in the bore of the hub to prevent turning of the needle assembly, said shoulder on the boss cooperably engaged with a shoulder in the bore of the hub to limit inward movement of the boss in the hub bore, cooperating snap locking means on the boss and in the bore through the hub to lock the needle assembly to the barrel, said snap locking means including an annular, radially inwardly projecting locking flange in the inner end of the bore through the hub, an annular, radially outwardly projecting flange on the end of said boss adapted to be snapped behind the locking flange in the hub to lock the needle assembly to the barrel, said boss having an axial bore therethrough, a transfer needle fixed in the bore through the boss and including a sharpened end projecting beyond the end of the boss, and a Luer lock needle adapter on the other end of the needle assembly for attachment thereto of a piercing means, said transfer needle extending axially inwardly into thE barrel and adapted to pierce the stopper in the vial for withdrawal of the medicament and the like from the vial and through the transfer needle assembly.