Sterilizers play a crucial role in the in vitro diagnostic (IVD) industry, being widely applied inreagent production, consumable processing, equipment maintenance, and quality control to ensure product sterility, safety, and accuracy of test results. Specific application scenarios and examples are as follows:
I. Sterilization Applications in IVD Reagent Production
1.Sterilization of Production Water and Solutions
-Scenario: Large quantities of sterile water, buffer solutions, diluents, and other liquids are required during the production of IVD reagents (e.g., biochemical reagents, immunological reagents, and molecular diagnostic reagents).
-Sterilization Methods:
-Autoclave (High-Pressure Steam Sterilizer): Used for heat-resistant solutions (e.g., normal saline, culture media) to thoroughly eliminate microorganisms via 121°C moist heat sterilization.
-Filtration Sterilizer: For thermolabile solutions (e.g., enzymes, antibodies, fluorescent probes), a 0.22μm filter membrane is used to remove bacteria and fungi while avoiding thermal degradation of active ingredients.
-Example: Polymerase solutions in PCR kits require filtration sterilization to ensure no nuclease contamination.
2.Sterilization of Production Environment and Equipment
-Scenario: Surface sterilization of equipment and tools, as well as air disinfection, in cleanrooms (e.g., Class 10,000/100,000 clean zones).
-Sterilization Methods:
-Hot Air Oven (Dry Heat Sterilizer): For glassware (e.g., test tubes, pipettes) and metal tools via high-temperature dry heat sterilization (160-180°C for 2 hours).
-Hydrogen Peroxide (H₂O₂) Sterilizer: Utilizes vaporized hydrogen peroxide for surface and space sterilization of biological safety cabinets, clean benches, and pass-through boxes, offering no residue and minimal equipment corrosion.
-Example: In immunodiagnostic reagent production lines, pipette tips and reaction cuvettes are used after dry heat sterilization.
II. Sterilization of IVD Consumables and Containers
1.Sterilization of Disposable Consumables
-Scenario: Disposable consumables such as blood collection tubes, petri dishes, centrifuge tubes, and PCR tubes must be sterile during mass production.
-Sterilization Methods:
-Ethylene Oxide (EO) Sterilizer: Suitable for heat-sensitive plastic consumables (e.g., polypropylene centrifuge tubes) via EO gas penetration, featuring strong penetration and low-temperature processing (37-63°C) without affecting consumable properties.
-Radiation Sterilizer (γ-ray/Electron Beam): For rapid sterilization of large batches of consumables, with strong penetration and no chemical residue, suitable for reagent bottles and syringes.
-Example: Vacuum blood collection tubes are sterilized with ethylene oxide during production to prevent microbial contamination in the tubes, avoiding sample degradation.
2.Sterilization of Reusable Containers
-Scenario: Re-sterilization of laboratory glass containers (e.g., volumetric flasks, beakers) and metal instruments before reuse.
-Sterilization Method: Autoclave (moist heat sterilization) at 121°C for 30 minutes to thoroughly eliminate spores.
III. Sterilization Maintenance of IVD Equipment and Instruments
1.Internal Sterilization of Laboratory Equipment
-Scenario: Piping and reaction pools of automated analyzers (e.g., clinical analyzers, hematology analyzers, PCR instruments) require regular sterilization to prevent cross-contamination.
-Sterilization Methods:
-Chemical Disinfection + High-Temperature Sterilization: Equipment-integrated sterilization programs (e.g., sodium hypochlorite solution circulation followed by high-temperature drying).
-Ultraviolet (UV) Lamps: Air and surface disinfection for biological safety cabinets and clean benches (auxiliary method).
-Example: Sample probes and reagent probes of hematology analyzers are cleaned with 75% ethanol daily, and piping is periodically sterilized via high-temperature steam.
2.Sterilization in Biosafety Laboratories
-Scenario: Laboratories handling infectious samples (e.g., COVID-19 nucleic acid testing samples) need to sterilize waste, exhaust air, and wastewater.
-Sterilization Methods:
-Autoclave: Infectious waste (e.g., sampling tubes, protective clothing) is sterilized at 121°C for 30 minutes for harmless disposal.
-Built-in UV Lamps in Biological Safety Cabinets: Irradiate the work surface for 30 minutes after experiments to kill residual microorganisms.
IV. Quality Control and Compliance Requirements
1.Sterilization Efficacy Validation
- The IVD industry must comply with standards such asISO 13485 (Medical Device Quality Management System) andGMP. Sterilizers require regular validation of sterilization efficacy (e.g., biological indicator challenge tests).
-Example: A biological indicator containing *Bacillus subtilis* is used, and post-sterilization incubation is conducted to detect microbial growth.
2.Data Recording and Traceability
- Sterilizers must have real-time monitoring and recording functions for parameters such as temperature, pressure, and time to meet FDA 21 CFR Part 11 (electronic record compliance) requirements, ensuring traceability of the sterilization process.
V. Sterilization Requirements for Special IVD Products
-Microbiological Testing Reagents: Culture media and identification cards require strict sterilization to avoid interference from contaminating bacteria in test results.
-Nucleic Acid Purification Reagents: Centrifuge columns and magnetic beads need to be free of DNase/RNase contamination, achieved via dry heat or radiation sterilization.
-Point-of-Care Testing (POCT) Products: Packaging materials for glucose test strips and antigen detection kits must be sterile, using ethylene oxide or radiation sterilization.
Summary
The core role of sterilizers in the IVD industry is toguarantee product sterility, covering the entire process from raw material processing and production to end-use. With the development of IVD technology toward high sensitivity and high throughput, the requirements for precision and compliance of sterilization are continuously increasing, driving the evolution of sterilizers toward intelligence (e.g., automatic program control) and green technology (e.g., low-residue EO alternatives).
