The application belongs to the technical field of medical devices, and particularly relates to a nested loosing needle device for injectable
medicine, which comprises an injection structure, an injection needle body and a loosing needle body. The injection needle body is arranged on the port of the injection structure and used for
puncturing the
skin and injecting
medicine. The loosing needle body has an inner through hole and is used for being sleeved on the outer periphery of the injection needle body to realize the switching between the two states of the exposed injection needle body and the retracted loosing needle body. One end of the loosing needle body is smoothly connected with the injection needle body and used for
puncturing the
skin. The composite sleeve design realizes the loosing and
medicine injection functions of the needle device, significantly reduces the operation times, reduces the pain of patients, and improves the treatment efficiency and safety for complex diseases such as
connective tissue diseases, bone joint diseases and
soft tissue diseases. The design fills the blank of the multifunctional needle device in the prior art and has significant clinical application value.