| 摘要 |
A syringe (10) with needle retraction arrangement is adapted for automatically retracting the hollow needle (30) into a hollow plunger (70) after use so as to prevent the used needle from contacting with anybody. The syringe provides a closure seat (73) at one end of a hollow plunger, wherein when the closure seat is intentioanlly pushed towards a mounting seat (60) affixed in a mounting portion of a hollow barrel (20), a pusher member (74), which is detachably connected with the closure seat, presses a tip head (31) of a hollow needle as well as an O-ring (50) thereon to slide towards a needle hub (23), to compress a compression spring (40) to store a resilient force. When the engagement of the O-ring between the ring groove of the tip head and the annular wall of the O-ring passage is released, the resilient force stored in the compression spring will upwardly push the tip head of the hollow needle to press against the pusher member and breaks its connection with the closure seat to open an entrance aperture provided on the closure seat, so that the hollow needle, the pusher member and the compression spring will all be retracted into the receiving cavity of the hollow plunger automatically.
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