New rubber stopper

The new rubber stopper includes a plug face and a plug neck connected thereto. There are two characteristics: First, the middle of the top of the plug face downwards depression, on the one hand, the middle thickness of the plug surface is thinner than the surrounding, the injection needle has a small puncture resistance, the needle drop is less, the rubber plug has less material, and the production cost is low; The distance between the top middle lower end of the plug surface and the bottom of the plug neck reduces the direct contact area between the rubber plug and the drug, reduces the reaction between the rubber plug content and the drug, improves the compatibility of the drug and the rubber plug, and relatively prolongs the effective period of the medicine. . The second is that the neck is made into a certain oblique neck shape, which can prevent skipping during the stoppering process.