It is a model from the earlobe plane to the umbilical plane with its head turned to one side. It's put in a standard central venipucture and catheterization position, including landmarks such as right arm, clavicle, ribs, sternocleidomastoid muscle, sternoclavicular joint, etc. It can be used for ultrasound-guided subclavian vein and internal jugular vein puncture and catheterization. The model's arm can be used for ultrasound-guided PICC catheter placement.