27 years... For THIS?
Not a very bright idea in my opinion. And 'using them as intended'. That's the whole problem isn't it. People are NOT using conventional syringes as intended, why would they use these new ones 'as intended'?
There is a much better and 'greener' solution: Every syringeneedle has a protective 'hat' on it before it is used. Fill this 'hat' with a sterilizing liquid. So even if someone does use a syringe more than once, it can be sterilized simply by replacing the 'hat', and flushing it sterile by a small pumping action. And this idea took me only 27 seconds to invent.