1. Field of the Invention
The present invention relates generally to a hypodermic syringe and, more particularly, to such a hypodermic syringe having a plunger pull-out stopping structure.
2. Description of the Related Art
Regular hypodermic syringes are commonly designed having the plunger breakable after use of the syringe. A safety hypodermic syringe of this design has a stop flange formed on the inside wall of the barrel for stopping the plunger in position for breaking. However, this stop flange cannot positively stop the plunger inside the barrel. If the user pulled the plunger backwards from the barrel with an excessively high pulling force after use of the syringe, the plunger may be moved over the stop flange out of the barrel. If increasing the size of the stop flange is increased to prevent the plunger from falling out of the barrel, the installation of the plunger in the barrel becomes difficult.