| 摘要 |
A disposable syringe includes a hollow barrel, an annular outer neck and inner neck mounted on the top of the hollow barrel respectively, a first cavity contained in the inner neck and having two opposite abutting edges, a needle located in the inner neck and having a lower end secured in the top of the hollow barrel and an upper end projecting from the inner neck, a rotary cap rotatably mounted on the outer neck and containing a second cavity aligning with the first cavity, a guide slot contained in the top of the rotary cap to receive the needle therein and connecting to the first cavity, and a drive knob pivotally received in the second cavity and having a first end portion containing a needle hole to receive the needle therein, a mediate portion abutting one of the two abutting edges of the first cavity, and a second end portion secured to the rotary cap to rotate therewith.
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