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Although disposable syringes are widely promoted, its still hard to check whether the syringes have been used, and the risk of reusing syringes is high (especially in terms of HIVAIDS). This new disposable syringe has a ribbon-shaped transparent coat in its internal side. When it is brand new, the coat can not be seen. But when the syringe is used, the liquid will turn the coat into red. Thus people can see the red ribbon symbol which reminds them of the hazard of HIVAIDS and make them discard the used syringes.
LIN Quan, XIANG Wei, HU Tianpei, Fang Yao, PAN Zuoren