When insulin is subcutaneously infused using the insulin infusion set, it will require the needle to be inserted into the fat layer under the skin together with the plastic tube. The tube will remain undamaged under the adipose layer after the needle is removed. A steel needle may be used instead of the plastic tube. The insertion method is one of the differences of insulin infusion sets. Although a majority of users prefer using their hands, some users opt to push it. A spring-loaded device can be used in injecting rather than using the hand.
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