Needle-free syringe is an instrument for injection by pressure. Its principle is that the liquid medicine passes through a very fine hole through high pressure, and then a liquid column is generated, which penetrates the skin and is sprayed under the skin. Its advantage is that it eliminates the fear of needles and the pain of the injected person. Needle-free injection technology was born in Europe and America a hundred years ago, but it has not been widely used. Now its volume is very small, and the injection effect is greatly improved. At present, it is widely used for injection of a small amount of liquid drugs such as insulin and vaccine. The technical advantages of Injex series painless needleless syringes are as follows: 7? 8Injex needle-free syringe eliminates the pain caused by injection (the pain caused by injection is a problem that every patient must face, and it is also the main reason why many patients refuse and do not cooperate with clinical treatment. If the pain is unusually obvious during the injection, it is often because the needle entry site touches the subcutaneous nerve. At this time, if the pain can be tolerated, the needle can be pulled out quickly after injection. If the pain is unbearable, you can re-inject it at another injection site. Injex30 needle-free injection will never hurt again); ? 7? 8 Injex needleless syringe avoids the leakage caused by needle injection (the high pressure of high-pressure needleless syringe makes the injection more rapid and accurate); ? 7? 8 Injex needle-free syringe overcomes fat pad, fat atrophy and other fat conditions (spray injection, diffusion absorption and absorption curve are closer to physiological distribution); ? 7? 8 Injex needle-free syringe will not be infected (high-pressure needle-free injection and professional disinfection equipment ensure aseptic operation to a greater extent to avoid skin infection and damage); ? 7? 8 Injex needle-free syringe can reduce the edema caused by injection in newly treated patients (atomized spray flows into the skin, which has a wider range of action, better and faster absorption, and avoids the edema caused by a large number of injections in the early stage of patients); ? 7? The injection dose of 8 Injex needle-free syringe is accurate (adjustable 0.0 1ml); ? 7? 8Injex needle-free syringe needs no disassembly and cleaning, and the operation is simple and easy to learn (the previous needle-free injection pen needs to be disassembled and cleaned every two weeks); ? 7? 8Injex needle-free syringe is small in size, easy to carry, and can also be used by patients with visual impairment;