The position of subcutaneous needle injection is often selected at the lower edge of deltoid muscle of upper arm, abdominal wall on both sides, back, front and outside of thigh. It is mainly used for low-dose subcutaneous administration, vaccination and local anesthesia. The injection method of subcutaneous needle is as follows: tighten the local skin with one hand and hold the syringe with the other hand to show the finger and fix the needle bolt. The inclined plane of the needle is upward and at an angle of 30-40 degrees with the skin. Quickly stab 1 / 2-2 / 3 of the needle stem into the subcutaneous skin, loosen the hand tightening the skin, pump the piston, and slowly inject the injection solution if there is no blood return. Avoid inserting the needle into the muscle layer. In addition, ensure that the needle does not penetrate into the blood vessel.
