Cap anti-dropping structure and injection pen

Abstract

The utility model belongs to the technical field of syringe, specifically relates to the cap of syringe, the utility model provides a cap anti -drop structure, include: the outer pressure cover and set up the connecting ring at its bottom, the inner bushing, the two through -holes that mirror image set up have in the bushing wall of inner bushing, set up the overhanging piece on the top wall of through -hole, the overhanging piece is provided with the protrusion to the inner bushing outside direction, the needle cover is equipped with mirror image set up two bosses on its inner wall, wherein when the outer pressure cover is assembled with the needle cover, the boss is deformed to the inner bushing center direction by extruding the protrusion and letting the overhanging piece, after the outer pressure cover continues to push, the bottom surface of protrusion moves to the top of boss and bounces to the top surface of boss, the utility model sets up the overhanging piece on the inner bushing and sets up the boss on the needle cover, sets up the boss on the needle cover that connects the needle, realizes the up and down direction spacing effect on the cap, avoids the cap to separate under the friction or the touch state, strengthens the cap connection stable strength.

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