How does the hypodermic needle work?

 Bring all the supplies to the bedside, check and explain to the patient in order to obtain cooperation. Select the injection site, disinfect the skin with 2% iodine tincture and 70% alcohol, and let it dry. 2. Inhale the liquid medicine into the syringe, exhaust the air, tighten the skin in your left hand, hold the syringe in your right hand, and fix the needle with your index finger. The oblique surface of the needle is upwards and the skin is at an angle of 30 to 40 degrees. If you are too thin, you can pinch the injection site and pierce the needle quickly For two-thirds of the patient, let go of the fixed needle plug in the left hand, aspirate without returning blood, and then inject the liquid medicine. 3. After the injection, use a sterile cotton swab to lightly press the needle puncture site to quickly remove the needle and clean up the material.

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