Yuhuan New Times Machinery Equipment Co., Ltd. tells you that choosing the right needle length for needle-resistant insulin pen needles is the key to ensuring safe, reliable, leak-free and discomfort-free injection of insulin into the subcutaneous tissue. The choice of needle length should be considered individual, including the user's body size, insulin type, etc. The shorter the needle, the higher the safety and the better the passage tolerance.

The thickness of skin and subcutaneous fat in the Chinese population is similar to that in other countries. The average skin thickness is 1.91 mm for the upper arm, 2.10 mm for the thigh, 2.47 mm for the abdomen, and 2.68 mm for the buttocks. Women had slightly higher average skin thickness than men, and those with higher body mass index (BMI), a proxy for obesity, had slightly higher skin thickness than those with lower levels, but these parameters did not affect the choice of needle length. The average subcutaneous fat thickness was 7.23 mm for the upper arm, 7.37 mm for the thigh, 12.14 mm for the abdomen, and 10.48 mm for the buttocks. The thickness of subcutaneous fat in women is slightly higher than that in men. The vertical insertion of the 4mm needle avoids injecting insulin into the muscle in 99% of patients. The longer the needle, the higher the risk of an intramuscular injection, especially in the upper arm. 4mm needles are recommended for all populations: 4mm needles enter the subcutaneous tissue, with minimal risk for intramuscular (or intradermal) injections, and are safe for both adults and children, regardless of age, gender and body mass index (BMI).

Young children and very thin adults should use a 4mm needle, which needs to be pinched and inserted vertically. When using a 4mm needle for other people, there is no need to pinch the skin; whether or not the skin is pinched, the 4mm needle should be inserted vertically; if a child uses a 5mm needle The 4mm needle should be squeezed into the skin for injection; obese patients use a 4mm needle, which is safe and effective, and a 5mm needle is also acceptable; when injecting, avoid pressing the skin to cause depressions to prevent the needle from penetrating too deeply and reaching the muscle tissue. Compared with other long needles, using short needles to inject insulin is safer and more effective, and patients experience less pain.