| 摘要 |
A pre-filled syringe is provided with a retractile needle. The needle end of a syringe (100) is enclosed in a sterile chamber (109) within a casing (108) sealed by a cap (110) with a break-off tip (112). The barrel of the syringe is movable within the casing from a remote pre-injection position to a forward injection position and back again. When the barrel is moved forward a first end of the needle passes through the opening of the cap (110) and then the opposite end comes in contact with the injectant (128). When the barrel is withdrawn to a pre-injection position, the needle is retracted within the casing and is prevented from re-entering the opening in the cap. |
