With the gradual popularization of central oxygen supply system, central suction system has replaced traditional mechanical suction equipment in many hospitals cooperating with our company. The central suction system is widely used and easy to operate. It is mainly used for the diagnosis and treatment of sputum, blood, concentration and other internal pollutants. Not only improve the ward environment, reduce the physical labor of medical staff, but also continuous suction and ready to use, greatly improve the curative effect. The central suction system is suitable for in-patient wards, especially operating rooms, intensive care units and emergency rooms.