How to inject intravenously?

[Materials] Injection tray, sterile dry lo-50ml syringe, needle and liquid medicine injection. [Methods] It is almost the same as venous blood collection. When the blood flows back after needle insertion, loosen the tourniquet and slowly inject the liquid medicine. During the injection, draw as much blood as possible to check whether the needle is still in the vein. [Note] 1. Check the syringe and needle before injection, and check the patient's name and liquid medicine. 2. Before injection, air should be exhausted. If there are many small bubbles attached to the syringe wall, 0.5m 1 air can be pumped. Turn the syringe to merge the small bubbles into large bubbles, and then push the piston to drive them all out. 3. When puncturing, you must calmly grasp the angle and direction of the needle, so as not to puncture the vein and cause hematoma. If the vein is accidentally punctured, you should immediately pull out the needle, press the local area, and choose another vein puncture. 4. Pay attention to the venipuncture methods of different patients, such as obese patients, whose veins are deep and fixed, and then puncture after accurate identification; The vein of emaciated patients is slippery, so the upper and lower ends of the vein must be fixed during puncture; According to the anatomical position of the vein, patients with edema can press the local area with their fingers to temporarily disperse subcutaneous hydrops, and then puncture after exposing the vein; Dehydrated patients can use local hot compress, massage and other methods to dilate and expose blood vessels before puncture. 5. Avoid injecting liquid medicine outside blood vessels. Drugs with strong stimulation to tissues can be injected by guiding first (that is, prepare another syringe and needle filled with normal saline, puncture first when injecting, inject a small amount of normal saline to confirm that the needle is in the blood vessel, then remove the syringe and replace it with another syringe filled with liquid medicine to push the medicine). If there is overflow, stop injection immediately, inject physiological saline or other diluted liquid locally, and use Jinhuangsan externally to prevent tissue necrosis; Report to the doctor at the same time. 6, injection speed should be treated according to the medicinal properties. 7. Patients who need repeated intravenous injection for a long time should pay attention to protecting the vein and choose the injection site from small to large, from far to near in a planned way. If you have phlebitis, don't inject it in this part. Treat it with hot compress, physical therapy or topical anti-inflammatory drugs. 8. After injection, open the syringe piston and soak it in disinfectant.