| 摘要 |
A prefilled syringe is disclosed which comprises a syringe body with a slidable piston defining a compartment therein containing a substance to be injected. An injection needle is arranged for communicating with said compartment through said piston and sleeve means are provided around the needle in slidable relationship with said syringe body. A compression spring is urging the sleeve means in a position in which the same surround the tip of the needle and the syringe body is closed before and after an injection. |
