Laminar flow operating room requires not only high cleanliness of air (air entering the operating room must be purified by high efficiency filter first), but also control the direction of air flow (that is, use laminar flow ultra-clean device) to make the air flow from the operating area with high cleanliness to the area with low cleanliness, taking away and discharging dust particles and bacteria in the air flow; Laminar flow is a thin air flow, which is transported in the same direction at a uniform speed; The flow direction of purified air can be divided into vertical laminar flow and horizontal laminar flow. The ceiling of the operating room is installed directly above the operating bed, and the airflow blows vertically. The air return ports are located at the lower parts of both sides of the wall (but it is not advisable to use four corners or four sides to return air) to ensure the cleanliness of the operating table. Generally, the laminar flow operating room is a "positive pressure" environment, and its air pressure depends on its different areas (such as operating room, aseptic preparation room, hand brush room, etc.). ).
Different levels of laminar flow operating rooms have different air cleanliness standards. For example, the domestic standard I laminar flow operating room has a cleanliness level of 5, and the number of dust particles per cubic foot is ≥0.5μm, and the number of dust particles per liter is ≤ 100 or ≤3.5. The standard of secondary laminar flow operating room is cleanliness level 6, with dust particles ≥0.5μm per cubic foot of air ≤ 1000 or ≤35 per liter of air. The standard of three-level laminar flow operating room is cleanliness level 7, with air dust particles ≥0.5 μm≤ 10000 per cubic foot or ≤352 per liter. And so on.
In the controlled space environment, different levels of laminar flow systems have different air replacement rates. The higher the cleanliness, the faster the replacement speed, and vice versa.
The wall of laminar flow operating room should be painted with special coating with bacteriostatic effect, with bright light and soft color, and no need to clean and rinse with water.