Replacement cycle and precautions of high efficiency air filter in clean operating room of hospital
When replacing the high-efficiency air filter in the clean operating room of the hospital, it is forbidden to contaminate the operating room with dust and glue brought by the high-efficiency filter. When sealing, it is recommended to clean the inside of the box where the filter is placed. If you can't replace it, you can contact the factory to clean and replace it.
After updating the high-efficiency filter, it is recommended to test whether the cleanliness of the initial installation is achieved. If not, dust particle counter can be used to measure. Generally, there are three reasons why the cleanliness is not achieved:
A. filter itself.
B. the filter and installation box are not well sealed,
C. if the problem in the operating room is not clear, you can contact the manufacturer to give a cleaning plan!
Before installation of high efficiency air filter in operating room, the following conditions shall be met:
1. Clean room (area) building decoration and piping route have been completed and accepted
2. The clean room (area) has been completely cleaned and cleaned, and the purification air conditioning system has been cleaned and continuously commissioned for more than 12h;
3. The installation site and relevant parts of the high efficiency filter have been cleaned and wiped;
4. The appearance of the high-efficiency filter shall be inspected, and the frame, filter paper, sealant, etc. shall be visually inspected, without deformation, fracture, falling off and other damages;
The high-efficiency filter belongs to the hospital purification consumables. In order to ensure the cleaning effect, it is generally replaced every other period of time. Now most purification areas install the high-efficiency filter at the ceiling air supply outlet. The installation method and the confirmation before installation completely determine whether the high-efficiency filter has any leakage point.
Pay attention to the following problems when installing the high efficiency filter.
1. During the transportation and storage of high efficiency filter, it shall be placed in the direction marked by the manufacturer. During transportation, handle with care to prevent violent vibration and collision, so as to avoid damage caused by man.
2. Before the installation of high efficiency filter, clean and wipe the clean room. If there is dust in the air conditioning system, clean and wipe it again to meet the cleaning requirements. If the high efficiency filter is installed in the technical mezzanine or ceiling, the technical mezzanine or ceiling shall also be fully cleaned and wiped.
3. After the clean room and purification air conditioning system meet the cleaning requirements, the purification air conditioning system must be put into trial operation. After continuous operation for more than 12h, clean and wipe the clean room again and install the high efficiency filter immediately.
4. Before the installation of the high efficiency filter, the package must be unpacked at the installation site for visual inspection, including whether the filter paper, sealant and frame have burr and rust (metal frame): whether there is product certificate and whether the technical performance meets the design requirements. Then carry out leak detection. (see Appendix VI and I) those qualified after inspection and leakage detection shall be installed immediately. During installation, the resistance of each filter shall be reasonably adjusted. For unidirectional flow, the difference between the rated resistance and the average resistance of each filter on the same air inlet or air supply surface shall be less than 5%.
5. The frame for installing high efficiency filter shall be flat. The allowable deviation of the flatness of the installation frame of each high efficiency filter shall not be greater than 1mm. And keep the arrow on the outer frame of the filter consistent with the air flow direction. When it is installed vertically, the fold of filter paper shall be perpendicular to the ground.
6. When the sealing between the high efficiency filter and the frame generally adopts the methods of gasket, self-adhesive, negative pressure sealing, liquid tank sealing and double ring sealing, the packing surface, filter frame surface, frame surface and liquid tank must be wiped clean. The thickness of the gasket shall not exceed 8mm, and the compression ratio shall be 25% ~ 30%. The joint form and material shall meet the design requirements, and there shall be no leakage at each joint of the frame. When using double ring sealing strip, do not block the hole on the ring cavity when pasting the seal; both double ring sealing and negative pressure sealing must keep the negative pressure pipeline unblocked.
7. At present, most filters in China are installed by gasket method. Because sponge rubber plate is closed hole type and has good air tightness, it is generally used as sealing material. If necessary, it is better to apply a little glass glue evenly on the sealing strip. When connecting the filter and the static pressure box, the stress around should be even. After 24 hours, the glass glue is dry before running the purification system.
Replacement cycle of high efficiency filter of purification system in operating room reference:

The high efficiency filter of the operating room purification system is an important guarantee for the sterile environment of the operation. According to the relevant national specifications, the high efficiency filter of the operating room needs to be replaced every 2-3 years to ensure the purification effect.

Preparation for high efficiency filter replacement in operating room:
1. Manage the access of personnel and various articles in the operating room.
2. Powder gloves shall not be used in laminar flow operating room.
3. It is forbidden to fold all kinds of cloth dressings or bring personal belongings, books and newspapers into the operating room.
4. The emergency operation should be performed in the most lateral operating room of the operating department, and the infection operation should be performed in the operating room close to the dirt channel.
5. Connect the operation equipment to operate continuously, and ensure enough self-cleaning time at intervals.
(2 infection prevention management)
6. All cleaning work shall be wiped with wet cloth during the operation of purification system.
7. Before entering the operating room, all kinds of instruments and equipment shall be installed and wiped clean.
8. After the operation, the site should be cleaned, wiped and sorted out.
9. After the operation, all kinds of dirt shall be removed, sealed in the classification bag and transported out from the dirt channel.
10. Before and after operation every day, wipe the surface and ground of various equipment such as shadowless lamp, instrument car, anesthesia table, operating table, wall cabinet, etc. with disinfectant once respectively.
11. Clean and disinfect the isolation shoes worn by the staff after use.
12. Wipe, disinfect, clean and maintain all equipment and ground once a week.
13. Clean the coarse filter, medium efficiency filter and air return device once a week.
14. Wet wipe the coarse filter, medium efficiency filter and return air net with 500 mg / L chlorine containing disinfectant every two weeks.
15. The air and equipment surface of clean operation department shall be sampled for bacterial culture every month, and the temperature and humidity shall be tested once. And register the results for record.
16. Replace the primary and intermediate efficiency filters every 6 months. Replace the high efficiency filter every year.
[3 monitoring management]
17. The infection control team in the operating room shall carry out the monitoring sampling inspection of air, hand, material table, disinfectant and the rectification summary of the monitoring work every month.
18. Air cleanliness monitoring adopts "multi-point control sampling" detection method. Static method is the main method, dynamic method is the auxiliary.
Install high efficiency filter in operating room to avoid dust operation:
The installation of high efficiency air filter in operating room shall meet the following requirements:
1. The high efficiency air filter in the operating room shall be installed immediately after passing the appearance inspection;
2. The frame for the installation of high efficiency filter shall be flat and clean, and the flatness deviation of the installation frame of each filter shall not exceed 1-2 mm;
3. The installation direction of the filter must be correct. After installation, the filter and the interface shall be tight without leakage;
4. When the high-efficiency filter adopts mechanical seal, it shall be sealed with air tight gasket with a thickness of 6-8 mm, which shall be tightly attached to the filter frame; after installation, the gasket shall be evenly compressed with a compression ratio of 25-50%; after installation, it shall be scanned for leakage detection;
5. When the high efficiency filter is sealed by hydraulic pressure, the tank rack shall be installed horizontally without leakage; there shall be no dirt and moisture in the tank. The height of the sealing liquid in the groove should be 2 / 3 of the groove depth, and the melting point of the sealing liquid should be higher than 50 ℃.
The arrangement of high efficiency filter shall meet the following requirements:
1. When the filter is arranged on the air supply surface of the lower part of the plenum parallel to the decorative layer or the current sharing layer, the full distribution ratio of the filter shall not be less than 0.75.
2. When it is arranged on the side of the static pressure box, it can be arranged on one side or the opposite side. The full distribution ratio of the side filter shall not be less than 0.75. The air flow in the static pressure box shall be fully mixed.
3. When restricted by floor height and indoor maintenance not allowed, the air supply surface with leakage resistance function can be used to arrange the filter outside the static pressure box, but it should be as close to the static pressure box as possible, and the air flow in the static pressure box should be fully mixed; the full distribution ratio of clean air flow should be less than 0.85.
4. For clean areas lower than level 100, when the air supply outlets are arranged centrally, the final stage high-efficiency filter in the air supply outlets can be arranged centrally or dispersedly, but the air supply surface must be provided with a current sharing layer.
5. For all clean rooms in class 100 laminar flow operating room, double side lower return air shall be used; when the distance between two sides is not more than 3m, one side lower return air can be used, but four corners or four sides return air shall not be used. Upper return air can be used for clean corridor and clean corridor.
6. The 100 level laminar flow operating room shall adopt indoor return air, and no residual pressure valve shall be set to return air to the corridor.
7. The hundred level laminar flow operating room must be equipped with an upper air vent, which should be located at the top of the patient's head side. The air burst speed of the exhaust outlet shall not be greater than 2m / s.
When replacing the high efficiency air filter equipment in the operating room, attention should be paid to:
1. Manage the access of personnel and various articles in the operating room.
2. Powder gloves shall not be used in class 100 laminar flow operating room.
3. It is forbidden to fold all kinds of cloth dressings or bring personal belongings, books and newspapers into the operating room.
4. The emergency operation should be performed in the most lateral operating room of the operating department, and the infection operation should be performed in the operating room close to the dirt channel.
5. Connect the operation equipment to operate continuously, and the interval time shall ensure enough self purification time.
6. All cleaning work shall be wiped with wet cloth during the operation of purification system.
7. All kinds of instruments and equipment entering the operating room shall be installed and wiped clean before entering.
8. After the operation, the site should be cleaned, wiped and sorted out.
9. After the operation, all kinds of dirt shall be removed, sealed in the classification bag and transported out from the dirt channel.
Clean operating room project is a professional, comprehensive and difficult project, with complex design and construction and high technical risk. Therefore, it puts forward high professional and technical requirements for purification engineering company, which requires purification engineering company to have high technical adaptability and flexibility. The purification engineering company is required to have an engineering team with rich experience in design, manufacturing, installation, comprehensive commissioning and after-sales maintenance to strictly guarantee the quality of purification engineering. For more knowledge of medical purification industry, please pay attention to WeChat public address: Aide-188 (Ed purify oxygen supply).