Negative pressure clean operating room should be built for patients with infectious diseases.
Methods: Effective measures such as adding exhaust fans should be taken to adjust the exhaust volume so as to change the positive pressure into negative pressure in the clean operating room.
Result: The negative pressure difference of air was used to control the airflow, absorb harmful gases and clean the indoor air in the clean area.
Conclusion: Using negative pressure operating room can fundamentally control and solve the problem of air pollution in operating room. A negative pressure operating room usually includes a ventilation system to allow air to flow from corridors or any adjacent area into the negative pressure operating room, while ensuring that polluted air cannot escape from the negative pressure operating room and into other areas of hospitals and health institutions.
Under natural conditions, air flows from the high pressure zone to the low pressure zone. If the operating room is in a negative pressure state, the outside air will continue to flow into the room from under the door, while preventing the gas pollution particles from escaping from the room and entering the corridor outside. Take a common example of a negative pressure chamber. A bathroom with an exhaust fan is a negative pressure chamber. When the negative pressure condition is formed, close the bathroom door and the fan will stop the bad smell and moisture from escaping from the bathroom.
To create a negative pressure state, it can be achieved by balancing the ventilation system of the room so that the air automatically emitted is more than the air automatically provided. This results in unbalanced ventilation, and the room ventilation system constantly sucks in air from the outside of the room to supplement. In a carefully designed vacuum chamber, air flows completely through a gap (usually about half an inch high) under the door. In addition to the gap, the negative pressure chamber should be as sealed as possible to prevent air from entering through various other cracks and slots, such as all kinds of cracks around windows, wall lighting equipment and sockets. Even if the room has achieved negative pressure conditions, the air leakage from these places may offset or eliminate the negative pressure state of the room.
The minimum pressure difference required to achieve and maintain room negative pressure so that air can flow into the room is very small (0.001 inches of the water gauge). The actual negative pressure depends on the difference between air consumption and supply in the ventilation system and the structure and size of the room, including air flow path and flow opening. If the room is well sealed, it is easy to achieve a negative pressure value higher than 0.001 inch water gauge. However, if the room is not sealed properly, as is the case in many health institutions (especially older ones), a larger negative pressure may require a greater difference in emissions/supplies than the capacity of the ventilation system.
In order to achieve a negative pressure environment under the normal operation of a ventilation system, first of all, adjust the air flow supply and emissions of the room to achieve emissions 10% or 50 cubic feet/minute higher than the supply (depending on the higher value). In most cases, this standard can achieve a negative pressure of at least 0.001 inch water gauge. If the negative pressure of the 0.001-inch water level gauge cannot be achieved, or by increasing the flow difference (within the allowable range of the ventilation system), it is necessary to carefully check whether there are gaps in the room (such as door gaps, window gaps, water pipe devices and various devices embedded in the wall), and then take remedial measures to seal these gaps.
The negative pressure in the room can be changed by changing the operation of the ventilation system or opening and closing the door, corridor door or window of the room. If an operational structure has been established, ensure that all doors and windows of the negative pressure chamber and other areas (e.g. corridor doors affecting air pressure) are properly closed, except where personnel are required to enter or leave the room or area.
How to design the hospital operating room purification project to meet the functional requirements?
Smoke test: Smoke test is a very simple procedure to determine whether the room is in a negative pressure state.
Specific Method: Place a fire tube under the door of the negative pressure chamber and keep it about 2 inches away from the door. Gently squeeze the bulb of the fire pipe to produce a small amount of smoke. Hand-held fire pipe, parallel to the door, the smoke is slowly discharged from the pipeline to ensure that the smoke discharging speed is lower than the air speed. If the room is under negative pressure, smoke will flow into the room from below the door. If the room is under non-negative pressure, the smoke will blow out of the door or remain stationary. The test must be carried out with the door closed, and all windows in the room must be closed. If the air purifier in the room is already in operation (including ventilation cabinet or biosafety cabinet), it must be kept in operation. If there is a reception room in the room, the pressure difference from the corridor to the reception room and from the reception room to the room should be tested.
Established in August 2010, Shandong Aide Purification Engineering Co., Ltd. has devoted ten years to the construction of special departments in hospitals. It is a laminar operation room purification, clean operation room decoration, ICU ward construction, neonatal NICU construction, CCU ward, hospital laboratory, central supply room decoration, laminar flow ward construction, venous configuration center design. Construction of professional enterprises. The main target of service is large, medium and small hospitals with professional contracting qualifications related to purification projects. There are many cases in the industry. Welcome new and old customers to consult. To learn more about the medical purification industry, please pay attention to the Wechat Public No. Aide-188 (Ed Purification and Oxygen Supply)