A kind of injection assistor, it includes clamshell, light illuminating unit and electronic control unit； The opening that the clamshell front end is equipped with for visually probeing into injection needle； What clamshell bottom face is arranged in the light illuminating unit, projects light source downward； The electronic control unit is arranged inside what clamshell and electrical connection controls light illuminating unit. So, fixed what human skin surface Hou is touched when operator presses assistor clamshell, the electronic control unit is shinny with integrated circuit control light illuminating unit, make light illuminating unit shadow that can penetrate into skin surface, enable blood vessel that can be developed easily by transillumination, helpful medical staff from clamshell opening peep the correct orientation of blood vessel and smoothly apply needle.一種注射輔助器，其包含殼罩、光照單元與電控單元；該殼罩前端設有可供目視與注射針探入的開口；該光照單元設置於殼罩底端面，使光源朝下投射；該電控單元設置於殼罩內部並電性連結控制光照單元。如此，當操作者將輔助器殼罩壓觸固定於人體肌膚表面後，該電控單元以積體電路控制光照單元發亮，使光照單元光影可滲入肌膚表層，令血管能輕易地被透照顯影，有助益醫護人員自殼罩開口窺得血管正確方位而順利施針。
