Arteriovenous indwelling needle puncture technique 1: selection of scalp veins

The median vein is the first choice, which is the larger one of scalp veins, thick and straight, not easy to slide, easy to fix, followed by superficial temporal vein (this vein is slender and straight, not sliding, obvious exposure), posterior auricular vein (relatively fixed, and slightly straight, or slightly curved, but easy to break).

A 5ml syringe was used to extract 3ml~4ml 0.9% normal saline and connect with trocar. , tighten the head skin disinfection of puncture, left hand holding trocar and skin into 5 ° Angle, quickly after skin, reduce the puncture point, according to the condition of blood vessels in the subcutaneous stealth is about 0.5 cm, needles and blood vessels are parallel, slow stab blood vessels, see after h., immediately stop into the needle, try to intravascular into a small amount of 0.9% saline, needle fixed needle handle no swelling of the left hand, Hold the needle wing with your right thumb and index finger, slowly withdraw the inner needle core, and send the outer cannula into the blood vessel. Fixed with aseptic transparent application, the plastic tube of scalp needle is fixed on the same side of the needle wing in "S" or "U" shape.

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