| 摘要 |
A syringe containing drug to be injected, the syringe includes an injection tube, a needle mounted at the front end of the injection tube, a rubber sealing jacket stopper jacketing on the peak of the needle and an injection tube core movably and hermetically put inside the injection tube, which is characterized in that the injection tube core consists of an ampule of cylindrical bottle shape and a piston, the back end of the ampule is closed and at its front end there are a flange and a neck portion, the central through hole of the flange and the neck portion is interpenetrated with the inner cavity of the bottle-shaped injection tube core; the outside top of the piston appears as a cone, and its outside lower part is a cylinder matching the inner wall of the injection tube, while the inside top of the piston appears as an inner cone, and the form of its inside lower part matches the shapes of the flange and the neck portion located at the front end of the ampule; at the cone-shaped top of the piston there is a slit linking up the inside and the outside of the top and inclined to the axis of the piston, so that a one-way valve which could be opened outwardly is formed at the cone-shaped top.
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