How to use the insulin needle, first put the insulin refill into the insulin needle, disinfect the head of the insulin refill, install the needle, empty the air from the needle, that is, you can set one unit at a time, squeeze forward until there is insulin squeezed out of the needle, this time means that the air has been emptied. After setting, you can use 75% alcohol to disinfect the skin of the injection site, and after the alcohol evaporates, pick up the insulin needle and inject insulin vertically until there is a “click” sound, which means that the required insulin has been injected completely. At this time, you should not pull out the insulin needle directly, but try to keep it inside for 15 seconds before pulling out the needle. There is no need to squeeze and sterilize the skin at the injection site, and this is the whole process of using the insulin needle.