Pulse vacuum sterilizerWith the core advantage of "vacuum extraction of cold air+high-temperature and high-pressure sterilization", it is widely used in fields such as medical, pharmaceutical, and food that require extremely high sterilization accuracy. The sterilization effect is directly related to product safety and usage risks, and it needs to be verified through scientific and systematic methods to ensure compliance. Starting from the verification basis, core methods, and key points, this article elaborates on the standardized verification process of sterilization effectiveness.
1、 Verify the core basis and premise
The verification of sterilization effect must strictly follow industry standards. In the medical field, reference should be made to the "Technical Specification for Disinfection of Medical Institutions" and the "Biological Monitoring Method for Wet Heat Sterilizers". In the pharmaceutical industry, the "Good Manufacturing Practice for Drugs" (GMP) should be implemented, and in the food industry, the "National Food Safety Standard - General Hygiene Specification for Food Production" should be followed. Before verification, it is necessary to confirm that the operating parameters of the sterilizer are compliant, such as sterilization temperature (usually 121 ℃ or 132 ℃), pressure (0.105-0.138MPa), pulsation frequency (3-4 times), and insulation time (15-30 minutes), to ensure that the equipment is in normal operation.
2、 Three core verification methods
Physical monitoring is the fundamental verification method, which tracks parameter changes throughout the sterilization process through the temperature and pressure sensors and printing recording devices that come with the sterilizer. During verification, it is necessary to focus on checking whether the vacuum stage has reached the preset vacuum degree (usually ≤ -0.085MPa), whether the heating stage has steadily increased to the target temperature, whether the temperature fluctuation during the insulation stage has been controlled within ± 0.5 ℃, and whether the pressure during the exhaust stage has been orderly reduced to atmospheric pressure. The physical monitoring data needs to be retained and archived. If there are parameter abnormalities (such as slow heating or inadequate vacuum), the use should be immediately stopped and the fault should be investigated.
Chemical monitoring is the key to process validation, which intuitively reflects whether the sterilization process is sufficient by placing chemical indicators. Common indicators include chemical indicator tape, chemical indicator cards, and BD test kits. The BD test needs to be conducted weekly to test the effectiveness of the sterilizer in removing cold air. The BD package containing a specific chemical indicator chart is placed in the empty state of the sterilizer for sterilization. If the color of the indicator chart changes uniformly, it indicates that the cold air is completely removed; If there is uneven discoloration, it is necessary to check the sealing of the vacuum system. When performing batch sterilization, it is necessary to stick indicator tape on the outside of each sterilization package and place indicator cards inside the package. If the indicator reaches the preset color change standard after sterilization, it indicates that the sterilization process is qualified before it can be released for use.
Biological monitoring is the gold standard for effectiveness verification, which determines whether sterilization is complete by detecting microbial residues after sterilization. Using thermophilic Bacillus subtilis spore slices as indicator bacteria, the slices are placed in sterile test tubes and then placed in sterilization packages that simulate actual loads, and operated according to normal sterilization procedures. After sterilization, inoculate the bacterial slices onto nutrient medium and incubate in a constant temperature incubator at 56 ℃ for 48 hours. If the medium is clear and there is no bacterial growth, it indicates that the sterilization is qualified; If turbidity or bacterial colonies appear, emergency procedures should be immediately activated to trace and re verify sterilized items from the same batch. Biological monitoring should be conducted at least once a month, and verification frequency should be increased after new equipment is put into use or repaired.
3、 Verification precautions and result handling
During the verification process, it is necessary to ensure that the load simulation is realistic. Medical scenarios should include different types of items such as surgical instruments and dressings, while pharmaceutical scenarios should simulate drug packaging specifications to avoid distortion of verification results due to load differences. All verification records must be detailed with dates, operators, equipment numbers, and results, and kept for a period of no less than 3 years. If any verification method fails, the sterilizer must be immediately stopped and the cause investigated (such as vacuum system leakage, inaccurate temperature sensor, expired indicator, etc.). After rectification, full verification must be carried out again until all indicators meet the standards before resuming use.
In summary, the sterilization effectiveness verification of the pulsating vacuum sterilizer needs to be combined with the three major methods of physics, chemistry, and biology, forming a dual guarantee system of "process monitoring+result verification". Strictly implementing standardized validation processes is not only a basic requirement to meet industry standards, but also a key measure to prevent sterilization failure risks.