Suction machines, also known as aspirators, are medical devices that create vacuum pressure to remove mucus, blood, saliva, vomit, or other secretions from a patient's airway, respiratory tract, or surgical sites, maintaining clear breathing and sterile fields. Using pumps—electric, rotary vane, or diaphragm types—they generate negative pressure (up to 500-600 mmHg adjustable) transmitted through tubing to collection canisters (1-2L glass/plastic with overflow protection), with hydrophobic bacterial filters preventing contamination. Types include portable battery-powered units for home care/ambulances, stationary high-capacity models for ICUs/ORs, manual hand/foot pumps for emergencies, and wall-mounted central systems; catheters (Yankauer, Frazier) suit oral/nasal/tracheal suctioning in neonates, adults, or post-op patients.