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High-efficiency filters in hospital operating theatres
High-efficiency filters in hospital operating theatresDepending on the number of airborne dust particles with a particle size greater than or equal to 0.5 μm allowed in the cleaned air, purified laminar flow operating theatres can be divided into four levels: 100,000, 10,000, 1,000, and 100. They, the higher the number, the lower the level of purification.The operating room air filter replacement cycle is as follows: rough low-efficiency filter resistance has exceeded the rated initial resistance of 60 Pa, or equal to 2 × design or operation of the initial resistance of 3-6 months, more than the standard at any time to replace the medium efficiency filter resistance has exceeded the rated initial resistance of 80 Pa, or equal to 2 ×. Design or operate the initial resistance for 6-12 months. If the resistance exceeds the standard, the sub-high efficiency filter resistance has exceeded the rated initial resistance of 100 Pa, or equal to 2 x the design or initial operating resistance (low resistance and high efficiency). 3 times) for more than 1 year, exceeds the standard, at 160 Pa initial resistance, or equal to 2 x design or operating initial resistance for more than 3 years when exceeding the high-efficiency filter resistance, any time exceeds the standard replacement level line for laminar flow supply ceiling high-efficiency filter replacement time. A clean operating theatre is one with an air cleanliness level of not less than 100,000. Maintenance Management The entire cleaning equipment system requires careful maintenance and repair by special maintenance personnel and the development of effective and practical measures. (1) The bonnets should be cleaned weekly. (2) The condition of the ventilator should be tested once a week. (3) Filtration equipment should be regularly inspected, repaired, and maintained to ensure proper operation and good performance. Test and secondary filters every 30 days and clean with detergent. It is good to use one set for cleaning. Depending on the application, the primary and secondary filters should be replaced every 3 to 6 months. The filters should be dry before replacement. Without the initial and intermediate filters, the equipment cannot operate, thus extending the life of the more expensive high-efficiency filters. Also, a clean environment around the clean room, proper operation of the air conditioning supply filtration system, and strict usage management practices are key to extending the life of the HEPA filters. (4) After 2 years of operation of the gas supply ceiling, the seals of the inlet and outlet doors should be checked. What to look for when replacing a high-efficiency air filter： 1. Good management of theatre personnel and various items. 2. Powder gloves should not be used in the laminar flow theatre. 3. Folding of various fabrics or bringing personal belongings and books into the operating theatre is strictly forbidden. 4. Emergency surgery should be performed in the outer operating theatre of the surgery and infections should be performed in the operating theatre near the dirt aisle. 5. The station's operating equipment should be operated continuously with intervals sufficient to ensure self-cleaning time. 6. All cleaning shall be carried out with wet cloths during the operation of the decontamination system. 7. The various instruments and equipment entering the operating theatre should be fitted and cleaned before entry. 8. Immediately after the operation, remove, wipe and tidy up various items. 9. After the operation, remove all kinds of dirt and sort and seal the inside of the bag and transport it out of the dirt aisle. 10. wipes surfaces and floors of various equipment such as shadowless lamps, instrument trolleys, anesthetic tables, operating beds, wall cabinets, etc. with disinfectant before and after operations 11. Clean and disinfect isolation shoes worn by staff. 12. Wipe down, clean, and maintain all equipment and floors thoroughly weekly. 13. Clean coarse filters, medium efficiency filters, and air return units once a week. 14. Wet wipe disinfect the coarse filters, and medium efficiency filters and return air screens with 500 mg/L chlorine disinfectant every 2 weeks. 15. Air and equipment surfaces in the clean surgery department are sampled for bacterial cultures and tested once a month for temperature and humidity. The results are registered and kept on file. 16. Medium efficiency filters are changed every 6 months. High-efficiency filters are replaced annually. 17. Monthly monitoring of air, hands, objects, disinfectants, etc., sampling, and summary of rectification of the monitoring is carried out by the infection control team in the operating theatre. 18. Air cleanliness is monitored using the "multi-point controlled sampling" test method. The static method is the primary method and the dynamic method is the supplementary method. The installation of high-efficiency air filters in the operating theatre should comply with the following requirements. 1. After passing the visual inspection, the high-efficiency air filter in the operating room should be installed immediately; 2. The frame where the HEPA filter is installed should be smooth and clean, and the deviation of flatness of each filter installation frame should not exceed 1~2mm; 3. The installation direction of the filter must be correct. The perimeter and interface of the filter should be tightened after installation; 4. When the high-efficiency filter adopts a mechanical seal, it should be sealed by a gas-tight seal ring with a thickness of 6~8mm, which should be tightly attached to the filter frame; the compression of the liner after installation should be even, with a compression ratio of 25~50%; after that, scanning and leakage detection should be carried out; 5. When the high-efficiency filter is hydraulically sealed, the frame should be installed at a leak-free level; there should be no dirt or water in the tank. The height of the sealing fluid in the tank should be 2/3 of the tank depth and the melting point of the sealing fluid should be higher than 50°C. Laminar flow operating theatres require not only a high degree of clean air (the air entering the theatre must first be purified by high-efficiency filters) but also control of the direction of airflow (i.e. the use of laminar flow ultra-clean) devices) to create a positive pressure environment within the theatre. The air flows from clean, high surgical areas to low clean areas, with small, thin layers of air flowing in the same direction and at uniform flow rates, removing and expelling dust particles (dirt particles) and bacteria. |
