Insulin needles are disposable and must be replaced with new needles each time they are used, and cannot be reused. Some diabetic patients, especially type 1 diabetic patients, need to be treated with insulin injections, and the frequency of insulin injections varies depending on the choice of long-acting, medium-acting and short-acting drugs. However, each time you inject insulin, you need to change to a new insulin needle. The repeated use of needles will often result in blunting of the needle, increase the irritation to the skin, or lead to deviation of the insulin injection dose, cause fluctuation of blood sugar, and in serious cases, lead to cross infection, or even needle breakage inside the skin, causing unnecessary harm and impact to patients. In addition, when diabetic patients apply insulin, they must follow the doctor’s prescription for regular and quantitative injections, not to miss or change the dose on their own, and pay attention to proper exercise to keep their blood sugar in a stable state.