Etileenoksied (EO Or EtO) Residuals After Sterilization
While Etileenoksied (EO) sterilisasie is the gold standard for medical device compatibility, the potential for chemical residuals post-processing is a critical safety concern. Manufacturers must ensure that all products adhere to ISO 10993-7 (AAMI 10993-7) standards to protect patients from potential toxicity.
Types of Residual Substances
During and after the EO sterilization process, three primary residues may be present based on the chemical interactions within the chamber or packaging:
Standard Limits (AAMI 10993-7)
The permitted limits for Ethylene Oxide residuals depend on the duration and type of patient contact:
| Category | Contact Duration | Limit Requirement |
|---|---|---|
| Limited Use | < 24 Hours | Strict limits for acute exposure |
| Prolonged Use | 24 Hours to 30 Days | Average daily dose limits applied |
| Permanent Use | > 30 Days | Most stringent lifetime dose limits |
Understanding Tolerable Contact Limit (TCL)
Devices with direct surface contact or implants must also pass the Tolerable Contact Limit (TCL). This metric prevents localized skin or tissue irritation caused by the release of EO or ECH. The TCL is calculated by analyzing the device’s total surface area against recorded residual levels.
How BOCON Helps You Meet ISO 10993-7
BOCON’s BCS Series ETO Sterilizers feature advanced integrated aeration systems. By combining heated aeration with high-efficiency vacuum pulses, our equipment significantly accelerates the removal of Ethylene Oxide residuals. This ensures your medical devices reach safe TCL levels faster, reducing lead times and ensuring total compliance with FDA and AAMI standards.