Safety injection syringe used in medicine for injecting liquid medicine comprises a cylinder, a connecting rod inserted into the hollow passage of the cylinder, a drive group and a needle holder inserted into the pump of the drive group

摘要

A safety injection syringe comprises a cylinder (10) with a hollow passage and a cover, a connecting rod (20) inserted into the hollow passage of the cylinder, a drive group (30) inserted into the cover of the cylinder and having a plunger (31) and a plunger pump (32) and a needle holder (40) inserted into the plunger pump of the drive group. Preferred Features: The front end (121) of the cover has a hole with a first pressing surface and a second pressing surface. The diameter of the second pressing surface is larger than the diameter of the first pressing surface.