| 摘要 |
The present invention is a leakproof needle cover structure improvement. It relates to a safety hypodermic syringe with the needle and the needle holder retractable to the syringe, in which the needle cover has a cap at its end part, and leakage-proof ring is formed around the inside of the cap, such that when the needle cover sheathing on the needle retracts, the cap will simultaneously cover the aperture of the barrel, thus effectively prevent the leakage of residual medicament kept in the barrel.
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