| 摘要 |
A single use retractable syringe ( 10 ) has an inner barrel ( 44 ) supporting a needle ( 16 ) at one end and is slidable within an outer barrel ( 11 ). In the packaged condition the inner barrel is in a position relative to the outer barrel such that the needle can be attached to a Luer connection on the inner barrel and projects from a first end ( 18 ) of the outer barrel. The inner barrel has first and second latching means ( 40, 41, 43 ) adjacent each end, respectively, and the outer barrel has retaining means ( 48 ) on the inner wall surface adjacent the second end thereof. When the inner barrel first latching means ( 40 ) is engaged with the retaining means the syringe is in position ready for use and after the first full depression of a plunger the inner barrel is released and moves to a position where the second latching means ( 41, 43 ) becomes permanently engaged with the retaining means. The needle is then fully enclosed within the outer barrel and the inner barrel projects from the second end ( 19 ) of the outer barrel.
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