Overview Of Ethylene Oxide (EtO) Gas Sterilization Technology And Riches Sterilization Equipme
1. Overview of Ethylene Oxide Gas Sterilization
2. Working Principle of Ethylene Oxide Sterilization
3. Applicable Items and Industry Applications
4. Technical Advantages of Riches Ethylene Oxide Sterilizers
4.1 Accurate and Reliable Control System
4.2 Full Temperature Monitoring and Uniform Heating
4.3 Dual-Path Sensors and Safety Monitoring
4.4 Safe Operation with Negative Pressure
4.5 Pneumatic Control and Safety Dosing System
4.6 Environmental Emissions and Residual Gas Treatment
5. Summary
1. Overview of Ethylene Oxide Gas Sterilization
Ethylene oxide (EtO) gas sterilization is a low-temperature sterilization technology widely used in the medical, pharmaceutical, and laboratory fields. It is particularly suitable for heat- and moisture-sensitive medical devices and equipment that cannot be sterilized using traditional high-temperature and high-pressure steam sterilization methods. Ethylene oxide is a broad-spectrum biocide that effectively kills bacteria, viruses, fungi, and their spores, achieving complete sterilization. Due to its low molecular weight and strong penetrating properties, ethylene oxide gas can penetrate materials and the tiny gaps in complex structures, achieving disinfection tasks that are difficult for other sterilization methods. Therefore, it has become the preferred sterilization method for a variety of precision instruments, electronic equipment, plastic products, and disposable medical supplies.
2 How Ethylene Oxide Sterilization Works
Ethylene oxide sterilization destroys the protein, DNA, and RNA structures of microorganisms through alkylation, thereby inactivating their activity and reproductive capacity. The entire sterilization process is typically carried out in a sealed sterilization chamber and includes pretreatment, vacuuming, humidification, dosing (ethylene oxide), sterilization, ventilation, and desorption steps.
During the sterilization process, temperature, humidity, gas concentration, and exposure time are the four key factors affecting sterilization effectiveness. The operating temperature is typically selected within the range of 37°C–55°C to avoid high temperatures that may damage the material.
3 Applicable Items and Industry Applications
Ethylene oxide sterilization is widely used for a range of items that are vulnerable to high temperatures and humidity, such as:
Surgical implants and catheters
Endoscopes and various flexible and rigid endoscopes
Cardiovascular devices such as heart valves and stents
Medical electronic equipment and sensors
Laboratory plastic consumables and culture media
This sterilization method is not only used in hospital central supply rooms and operating rooms, but is also common in medical device manufacturing plants, laboratories, and research institutes. It is a key technology for ensuring the sterility of medical devices.
4 Technical Advantages of Riches Ethylene Oxide Sterilizers
As a well-known domestic sterilization equipment manufacturer, Riches' industrial and medical ethylene oxide sterilizers excel in safety, reliability, and automation. The following are their key advantages:
4.1 Precise and Reliable Control System
This equipment utilizes a Siemens programmable logic controller (PLC) to fully control the sterilization process, enabling fully automated operation, including automatic door opening and closing, parameter setting, and process monitoring. Equipped with a dot matrix printer and data storage, the system supports the export of sterilization process data and historical traceability, meeting the medical industry's requirements for sterilization process records and audits. 4.2 Temperature Monitoring and Uniform Heating During the Sterilization Process
The device offers two temperature settings: 37°C and 55°C, with a temperature control accuracy of ±2°C during the sterilization phase. A six-sided heating element design, including independently controlled door heating, ensures uniform temperature within the chamber. Multiple temperature sensors monitor the temperature in real time. If deviations occur, a protection mechanism automatically activates, interrupting heating and sounding an audible and visual alarm to prevent damage to items.
4.3 Dual-Path Sensors and Safety Monitoring
The device is equipped with dual temperature and pressure sensors. If one fails, the other automatically takes over monitoring, ensuring continuous and stable operation. This complies with the requirements of the YY0503-202 industry standard and enhances redundancy and reliability.
4.4 Negative Pressure Ensures Operational Safety
The sterilization process maintains a negative pressure within the chamber, effectively preventing ethylene oxide gas leakage. If a leak occurs, the system automatically initiates an emergency purge sequence to remove residual gas and simultaneously sounds an audible and visual alarm, ensuring maximum operator and environmental safety. 4.5 Pneumatic Control and Safe Dosing System
Using disposable pure ethylene oxide gas cylinders reduces transportation and handling risks. The dosing process is fully automated: the pneumatic device activates to puncture the cylinder and release gas only when the chamber door is sealed and the temperature, vacuum, and humidity reach set values. During the residual removal phase, repeated evacuation and injection of fresh air effectively remove residual ethylene oxide from the surface of the object and within the chamber.
4.6 Environmental Emission and Residual Gas Treatment
The equipment offers two emission methods: direct discharge to the atmosphere, which must be piped to an unobstructed area on the rooftop; or using a water-neutralizing detoxifier (Patent No.: 201921955938.3), which converts the ethylene oxide into other compounds before discharge into the sewer. This method has been third-party tested and certified, making it more environmentally friendly and adaptable.
5 Summary
Ethylene oxide gas sterilization technology, due to its high efficiency, low temperature, and strong penetrating properties, has become an indispensable tool in the medical sterilization field. Riches' industrial and medical ethylene oxide sterilizers demonstrate a high level of technology in terms of automated control, temperature management, safety protection, and waste gas treatment. They can meet the multi-faceted needs of hospitals, laboratories, and production sites for sterilization safety, reliability, and traceability, providing users with a customized sterilization solution that complies with standards, is easy to operate, and is environmentally friendly.
