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Because the needles have bacteria after use, they cannot be reused. And some backward and poor areas, due to needles discarded, were mistakenly picked up and wounded by children, resulting in infection. In order to prevent the used needle from being used twice. This design is an improved design of the original needle and the ampoule, so that the used needle can be combined with the ampoule; the needle is hidden in the medicinal ampoule to prevent secondary use or accidental injury. This reduces the occurrence of large-scale infectious diseases caused by the common use of needles.