1. After blood vessels are selected for peripheral vein sampling, the needle is punctured with conventional scalp needle holding method. When blood is returned, the needle is fixed with the infusion patch, the needle handle and connector are fixed with the left finger, the vacuum tube is held in the right hand, and the end of the blood collection device is pierced into the vacuum tube. A good blood test tube should be selected before blood collection, and a tube should be changed immediately after collection. The needle Angle of blood collection should be selected according to the patient's fat and thin blood vessels.

2. It is used for the patients who have difficulty in venous blood collection of extremities such as hemorrhagic shock and systemic edema. The success rate of venous blood collection by vacuum vein needle is high. After routine skin disinfection, the operator holds the blood collecting needle in the right hand at the femoral vein location at 90° with the skin to enter the needle, stop the needle when blood returns, the right hand is fixed, the left hand takes the vacuum blood collection, the needle is inserted into the test tube, the blood automatically enters the test tube, and the needle is removed when the required blood volume is reached.

3. The vacuum blood sampling needle was used for series infusion, washing or pouring, and two or more bottles of the same or no incompatibility liquid were connected in series for infusion or washing, and the blood sampling needle was used for blood sampling before infusion.