| 摘要 |
A pre-filled hypodermic syringe adapted for use with a retractable-type needle unit ( 18 ). The syringe has a barrel ( 10 ) provided with a piston member ( 14 ). The piston member ( 14 ) includes a plastics portion ( 30 ) mounting a dislodgeable blocking portion ( 36 ) of chemically inert material in such a way that the plastics portion ( 30 ) is not in contact with the pre-filled contents of the syringe.
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