| 摘要 |
A safe retractable type syringe comprising a needle set, a barrel and a plunger, the needle set is inserted into and connected with the inner wall of the barrel from the front end of the barrel, and is pulled back into the barrel to be connected with the barrel after injection. The syringe is characterized in that, the bottom of the needle set has on the periphery thereof at least one first annular flange, the front end of the barrel has on its inner wall a second annular flange and at least two protruding ribs equidistantly away from the second annular flange; this can improve the state of connecting of the needle set with the barrel, the needle set and the barrel thus are tightly engaged with each other, thereby liquid medicine can be sealed, and the operations to insert with a force and connect and pull the needle set into the barrel are both easy; thereby manufacturing of the engaging structure of the needle set and the barrel can be easier.
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