To use an insulin needle, first put the insulin cartridge into the insulin pen, sterilize the head of the insulin cartridge, load the needle, empty the air from the needle, that is, you can set one unit at a time, and squeeze forward until the insulin is squeezed out of the needle. 75% alcohol can be used to disinfect the skin at the injection site, after the alcohol evaporates, pick up the insulin needle, insert it vertically, and inject insulin until it makes a “click” sound, which means that the required insulin has been completely injected, and at this time you can’t pull out the insulin needle directly, and you need to linger for 10 seconds before pulling out the needle. Insulin needles in the clinic mainly include long-acting insulin, short-acting insulin, premixed insulin. They are mainly used for patients with type 1 diabetes and patients with type 2 diabetes who need insulin treatment. The use of insulin needles is recommended to go to the hospital under the professional guidance of doctors.