| 摘要 |
An intravenous injection unit includes a needle set which has a first end connected with a hose and a needle is connected to a second end of the needl e set. A protrusion and a wing extend from an outer periphery of the needle set, an d a sleeve is movably mounted to the needle set and the wing and the protrusion are movably engaged with the slot. A plurality of stop plates extend from an inn er periphery of the first end of the sleeve inclinedly and inward so that the sleeve is moved toward the needle set after use till the protrusion moves over and is engaged with the stop plates, such that the needle is received in the sleeve and the needle set cannot be moved again.
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