The use of a medical syringe mainly includes key steps such as checking the instrument, selecting the injection site, disinfection, needle insertion, medication injection, and safe handling.
Core Usage Steps:
Checking the Syringe: Before use, ensure the packaging is intact, the needle is not bent or barbed, the syringe graduations are clear, and the plunger slides smoothly. Check that the medication is clear, free of impurities, and not expired.
Preparing the Medication: For medications that require mixing, such as insulin, gently roll the vial between your palms to avoid vigorous shaking that may create air bubbles. When drawing the medication, keep the syringe vertically upward and gently tap the tube to expel air until a small amount of medication spills from the needle tip, ensuring accurate dosage.
Selecting the Injection Site: Common subcutaneous injection sites include the abdomen (fastest absorption), the outer thigh, the outer upper arm, and the buttocks. Different sites have different absorption rates; rotate between sites regularly to avoid fat hyperplasia or induration.
Skin Disinfection: Using a 75% alcohol swab, wipe the injection site in a spiral motion from the center outwards, covering a diameter of approximately 5 cm. Allow the alcohol to evaporate and dry naturally before inserting the needle to prevent stinging or contamination.
Correct Needle Insertion: Pinch the skin to form a crease, and quickly and vertically insert the needle into the subcutaneous tissue at a 90-degree angle (adjust the angle as needed for thinner individuals). When using a shorter needle, it can be inserted directly without pinching the skin.
