SAFE INJECTION DEVICE, SYRINGE AND ASSEMBLY METHOD FOR SAFE INJECTION DEVICE

摘要

The present invention discloses a safety injection device, which relates to the field of medical instruments, including a needle, a needle hub, an elastic member, a slider, a needle shield, a protective sleeve, and an outer cover. The needle hub, the elastic member, the slider, the needle shield and the protective sleeve are sleeved in sequence with the needle as a shaft. The slider is configured to rotate irreversibly after a single use. The safety injection device according to the present invention has a simple and reasonable structure, and is safe, stretchable, and easy to use. In addition, it avoids fear of the needle tip during injection when use. After use, the injection device utilizes the eccentric principle to prevent from being fully depressed again, and the needle tip will not be exposed again, thereby more effectively avoiding the risk of cross infection caused by accidental contact with the needle tip after use. This structure makes it difficult to return to the initial position to be used after use, so that the injection needle is safer after use and will not be used again, which effectively avoids cross infection. After use, the injection device utilizes its colored and raised slider as a warning indicating that it has been used.