The puncture point of traditional PICC puncture is performed in the visible vessels of the patient’s elbow, which requires visible or palpable vessels in the elbow and thicker vessels for it to work. After placement, the patient’s movement will be affected to a certain extent, and it is not advisable to do repeated stretching movements. There are certain requirements for the patient’s blood vessels and certain restrictions on the patient’s activities. The PICC puncture is performed by applying the Seidinger technique under ultrasound guidance, and the puncture point is moved up to the upper arm, so that the patient’s movement is basically unrestricted and the limitation that the patient cannot be placed due to the poor vascular condition of the elbow is overcome. The incidence of phlebitis and venous thrombosis in patients is also lower than that of traditional PICC puncture methods due to the upward shift of the puncture site.