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Some diabetic children should do drug injection two or three times a day, which not only hurt their skin, but also get their heart hurt for they will suffer the embarrassment by others’ unfriendly attention when being injected. Designed for these diabetic children, this needleless injector can be used to inject liquid medicine into the skin from the tube installed in the front of the syringe with the pressure generated by high voltage devices. Moreover, shaped like a water pistol, this injector can effectively reduce children’s fear towards injection, and avoid being exposed to others’ unfriendly attention.