The insulin pen needles on the market are mainly different in size and length. First of all, let's talk about the size of the needle. We use the English letter G to express the size of the needle. The larger the number in front of G, the thinner the needle. For example, a 32g needle is thinner than a 31G needle. The thinner the needle, the less pain and tissue bruises caused by the injection.
For children and adolescents, generally, 4, 5 or 6 mm needles can be used for injection, and 4 mm needles can be used for direct vertical injection. 5 or 6 mm needles need to be pinched from the skin to form a skinfold before injection (avoid intramuscular injection) need to be pinched at 45 degrees. You will know more about safety insulin needles. For children or adolescents, an insulin pen needle with a diameter of more than 6mm is not generally used to reduce the risk of muscle injection. For adults, the shorter needle is chosen for the thinner group, and the longer needle is chosen for the obese group. If the longer needle is used for the thinner group, it will touch the muscle tissue, while the shorter needle used for the obese group may lead to the leakage of insulin from the injection site, resulting in inaccurate injection measurement.
In addition to the specifications of the insulin pen needle, the thickness and hardness of the needle will also affect the use. The thickness of the needle will affect the flow rate, because when the thickness of the needle is the same, the thinner the needle is. This means that the interior of the needle contains more liquid, the flow rate is faster, and it minimizes the risk of blockage.