A safety device for hypodermic needles

The invention relates to a safety device for a hypodermic needle, which comprises at least a cover body unit, a casing unit, a base unit, and a needle unit, etc. Wherein, the casing unit is a hollow pipe body with l-shaped chute in the periphery, and its front end is provided with an opening for the casing body unit to sleeve; The base unit is a hollow pipe body with a convex part in the periphery, and its rear end can be fixed in different injection barrels, and its front end is provided with a class segment for the needle unit to be fixed, and when the casing unit is inserted, the convex part can just move in the L-shaped chute, and is well guided; Thus, a retractable hypodermic needle safety device can be constructed without changing the original injection cylinder and needle structure, and the operation position is located behind the needle to ensure its safety in use.

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