| 摘要 |
A retractable safety type syringe operatable with single-hand comprises: a barrel with a bottom plate extending externally toward all directions on the rear end thereof; a needle set fixedly connected to the front end of the barrel, the needle set having a first engaging portion on the rear end thereof; and a plunger placed in the barrel, having on the front end thereof a second engaging portion to engage with the first engaging portion, and having an end plate on the rear end of the plunger. Thereby, two fingers can be used to hook the bottom plate of the barrel, and another finger of the same hand can be used to push forwards the plunger for injection; after injection, two fingers can be used to abut against the end plate on the rear end of the plunger, another finger of the same hand can be used to push the bottom plate extending out of the barrel, so that the plunger moves relatively to the barrel to get the function of pulling the plunger rearwards. In this mode, the user can push forwards the plunger and can pull back the plunger only with single-hand.
|
