The blood vessels of patients with chronic wasting disease are relatively fragile, and the needle should be inserted from the side of the blood vessel. When piercing, the direction of the needle should be parallel to the blood vessel, and the needle should not be too forceful when entering the blood vessel.
3.deflated vein
Special care should be taken when performing venipuncture in patients with profuse bleeding or fluid loss, where the veins are empty and flat due to hypovolemia. In this case, the picking needle method should be used, that is, carefully pierce the needle into the muscle layer of the blood vessel, lay the needle flat, and lift the needle gently to separate the front and rear walls of the blood vessel, so that the needle tip and the bevel slide into the blood vessel. Losing the feeling of resistance, even if there is no blood return, the needle has entered the blood vessel and can be injected.
4.sliding veins
A sharper needle can be used. Use the thumb and index finger of the left hand to fix the two ends of the blood vessel respectively, and insert the needle at a 30-degree bevel on the upper side of the blood vessel.
5.superficial venules
The veins of female patients and children are relatively small, and it is more difficult to puncture. In this case, you can choose a needle with a small bevel, and make preparations before the puncture. Hot compresses can be used to fill and expand the blood vessels to facilitate puncture.
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