Syringe device

摘要

A syringe device includes a core member received in the plunger and the core member is fixedly connected to a base member to which a needle cannula is connected. When the plunger is pulled, the base member is pulled into the barrel. Two flexible protrusions extend from the plunger and which expand wide when the plunger is pulled to a desired position. The expanded flexible protrusions limit the plunger from being pushed into the barrel again.