Medical-Grade Position Sensors: EtO and Autoclave Sterilization
Author: David Marriott, Spectra Symbol CEO
The need for the sterilization of tools and equipment is essential for the operation of many industries, but perhaps most importantly in the medical industry. Medical equipment is regularly exposed to harmful microorganisms and used by doctors and patients who may be vulnerable to those microorganisms.
Position sensors, like other components, undergo various sterilization processes to qualify for use in medical spaces. Spectra Symbol is a leader in manufacturing sensors for medical applications that can withstand harsh sterilization processes. Each sterilization process is different in the ways it stresses components. This article evaluates two of the more popular sterilization methods for sensors: ethylene oxide sterilization and autoclaving.
Ethylene Oxide Sterilization
Ethylene Oxide (EO or EtO) sterilization uses a gas mixture to penetrate packaging and other materials, killing microorganisms at lower temperatures than autoclave. Steam and high heat is still used in the process and reaches levels of 120°F to 135°F (48°C to 57°C). This method is best suited for:
- Heat and Moisture-Sensitive Materials: EO is ideal for sterilizing items that cannot withstand the high temperatures and high humidity of an autoclave like certain plastics, electronics, and components with intricate designs.
- Complex Instruments: EO’s ability to permeate small crevices makes it effective for sterilizing endoscopes and other instruments.
- Sterile Packaging: Because the gas can pass through porous packaging, EO is often used for pre-packaged medical devices like syringes and catheters.
Autoclave Sterilization
Autoclaves use pressurized steam to sterilize equipment, typically operating at temperatures of 121-134°C. This method is best for:
- Heat-Resistant Instruments: Stainless steel surgical tools and glassware can endure the high heat and moisture of an autoclave.
- Reusable Items: Items such as linens, surgical drapes, and some types of silicone or rubber products are commonly sterilized in autoclaves.
- Bulk Sterilization: Autoclaves are efficient for processing large loads of similar items in a single cycle.
Which Sterilization Method to use for your Sensors
When deciding between EO and autoclave for electrical components like sensors, it often depends on the robustness of the product. Typically, sensors and other electronics struggle to handle autoclaving temperatures as most electronics are only rated for temperatures up to 85C.
Many companies choose EO because of its lower heat and moisture, and its ability to sterilize intricate objects and materials. However, not all electrical components can withstand this process. Spectra Symbol provides sensors that can be safely sterilized using EO. These sensors are then used in compliance with regulation in medical and other industries. If you have questions about how our sensors may react to the autoclave process, please reach out to us here.
Use Cases of Sensors in Medical Devices
Sensors are found just about everywhere and the medical industry is no exception. Some examples are:
- Surgical robots for surgeries that require great precision
- Diagnostic equipment like endoscopes and x-ray machines
- Implanted devices like a pacemaker or insulin pump
Conclusion
EO sterilization is an effective form of sterilization and can be used with Spectra Symbol’s top-quality position sensors. If you have questions about Autoclave sterilization, please reach out to us so we can work on a custom solution.