The central venous catheter is a silicone and PVC material line placed in the large veins of the body, often placed in the subclavian vein, femoral vein, internal jugular vein, etc. It is divided into various models, including single-lumen, double-lumen and triple-lumen central venous catheters. Clinically, they are more commonly used for patients in emergency departments, ICU wards, anesthesiology departments, hemodialysis units, etc. They are more versatile and can measure central venous pressure to assess the amount of rehydration fluid. For malnourished patients, it can be used as a way to give long-term parenteral nutrition, and for large surgeries with heavy bleeding, large amounts of rapid intravenous fluids can be given through a central venous catheter to maintain blood pressure. Uremic patients are often used as vascular access for hemodialysis, and chemotherapy for tumor patients can be administered through a central venous catheter to prevent phlebitis, making the central venous catheter an important adjunctive treatment material in medical clinics.