Standards
ISO 11135
In one line
Standard for development, validation, and routine control of ethylene oxide (EO) sterilization.
Definition
ISO 11135 specifies requirements for EO sterilization processes for medical devices, including microbiological qualification, dose setting, process challenge devices, and parametric release options.
Ethylene oxide sterilization validation typically uses biological indicators and process challenge devices, often with overkill approaches such as half-cycle methods, to show a sterility assurance level of 10^-6. Validation also covers product and packaging compatibility, EO residuals (assessed under ISO 10993-7) and aeration. Increasing environmental regulation of EO emissions in the US and EU is pushing manufacturers to reduce EO use or move to alternatives.
Why it matters
EO sterilization capacity has been a persistent supply-chain risk; ISO 11135 conformance is essential to qualify alternative sites.
Common pitfalls
- •A common pitfall is the failure to re-validate the sterilization process after changes to the product, packaging, or equipment, which can compromise sterility assurance.
- •Another mistake is neglecting to perform routine biological indicator testing or chemical indicator monitoring, leading to undetected sterilization failures.
- •Assuming that a generic sterilization cycle is appropriate for all devices, without specific validation for each product, can result in inadequate sterilization.
- •Improper storage and handling of ethylene oxide gas cylinders or sterilized products can compromise sterility and safety.
- •Not adequately training personnel involved in the sterilization process can lead to procedural errors and non-compliance with the standard.
Sources