Through the subclavian puncture method, the puncture point is 1-2 transverse fingers (about 1.5-3cm) below the clavicle in the middle 1/3 of the right clavicle. If the puncture site is too lateral, it will increase the risk of arterial puncture bleeding. Use the center The venous trocar is inserted into the blood vessel (there is a simulated puncture hole on the model), the direction of the puncture site and the length of the catheter insertion can be referred to the relevant medical books.