Closed needle currently has two clinical expressions: First, the cannula of the cannula needle part of people also called sealed needle, belongs to a nursing operation, mostly used for long-term infusion patients, can reduce the number of repeated punctures, reduce the patient’s pain, each infusion at the cannula needle connected to the liquid, the end of the infusion with saline or heparin to seal the tube, to avoid blood coagulation blocking the needle, affecting the next intravenous infusion. Second, closed needle is referred to as closed needle, is a treatment means to relieve pain by blocking nerve conduction, improve local tissue nutrition, common pain point closure, tendon sheath closure, joint cavity closure, etc., can be used for acute and chronic injury of synovial membrane or tendon sheath, or some bone and joint disease. When playing closed needle should pay attention to avoid damage to the nerve, avoid the drug directly into the blood vessels, the operation pay attention to the aseptic operation, to avoid causing infection. As the closed drug to hormone, so should strictly control the amount of hormone, pay attention to the interval between the two closed time, avoid multiple treatments in a short period of time, to avoid the degenerative changes in the ligament caused by the local use of hormone too often.