Screwee / Syringe design

Syringe should be used just once. Reused syringe may infect people with several diseases.
But there are frequent cases of reusing the syringe globally because today’s syringe structure is too easy to reuse. This problem is global issue to solve.

How it works
1. At the end of injection, plunger automatically screws due to inner screwed barrel while keep pushing the plunger.
2. At this moment, plunger rubber will be fastened with a barrel.
3. The locked syringe would make people not to reuse the syringe.