Why is the needle at 30-40 degrees to the skin during hypodermic injection?

Quite professional. Subcutaneous injection: It is a method of injecting a small amount of liquid medicine into the subcutaneous tissue. Location: On the lower edge of the deltoid muscle of the upper arm, the outer side of the upper arm, the abdomen, the back, and the outer side of the thigh. During subcutaneous injection, the angle of needle penetration should not exceed 45 degrees to avoid penetrating the muscle layer. By the way: the injection angle of the intradermal injection needle is 5 degrees. The injection angle of the hypodermic needle is 30--40 degrees. The injection angle of the intramuscular injection needle is 90 degrees.

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