| 摘要 |
PROBLEM TO BE SOLVED: To provide a needle seat for a safety injection syringe, allowing easy pull of a needle into an outer cylinder and preventing the falling of the needle seat. SOLUTION: The needle seat for the safety injection syringe having a hollow columnar body and a connection part provided at the rear end thereof for engagement with the front end of a plunger rod of the injection syringe comprises at least one action part interconnected to the columnar body and at least one engagement part connected to the columnar body. The action part is located to be in two different conditions, an externally expanded condition and an internally contacted condition. In the externally expanded condition, the action part is not engaged with the engagement part, and in the internally contracted condition, the action part is pushed inward with outer force and engaged with the engagement part, showing the internally contracted condition. |
