SINGLE USE SYRINGE WITH NEEDLE MOUNT HAVING FLEXIBLE ARMS WHICH ARE MOVED RADIALLY INWARD AND ENGAGED BY PLUNGER DURING INWARD MOVEMENT, WITH ARMS GUIDED TO RESIST LATERAL MOVEMENT DURING PLUNGER RETRACTION

摘要

PCT No. PCT/AU96/00226 Sec. 371 Date Dec. 22, 1997 Sec. 102(e) Date Dec. 22, 1997 PCT Filed Apr. 19, 1996 PCT Pub. No. WO96/32977 PCT Pub. Date Oct. 24, 1996A syringe (10) comprises a barrel (12), a plunger (14) and a retractable needle mount (16). The needle mount (16) is secured in an opening in one end (20) of the barrel by resiliently flexible arms (64) having shoulders (62) which cooperate with shoulders (32) defined in recesses (28) of the barrel wall (36) by insert ring (24) seated on step (22). The plunger piston (96) has slots (114) in an end face thereof which closely receive the distal portions (74) of the arms (64) widthwise. The slots (114) have surfaces (116) which act on the arms to disengage the arms from the recesses (28) and catches (122) which cooperate with catch surfaces (80) on the arms so that the needle mount (16) is withdrawn with the plunger (14). The barrel (12) includes integrally hinged guide members (126) to axially orientate the plunger (14) relative thereto and the plunger has catch means (140) which cooperates with the guide member (126) to secure the withdrawn plunger.