How To Calculate Allowable Limits For Esterilización con óxido de etileno
Ensuring patient safety is the highest priority in Esterilización con óxido de etileno. Medical devices must undergo rigorous EtO residual testing to verify they meet the strict limits defined by ISO 10993-7. These compounds—Ethylene Oxide (OE), Clorhidrina de etileno (CADA), and Ethylene Glycol (P.EJ)—can be hazardous to health if not properly managed.
The Calculation of Allowable Limits (Alabama)
El Allowable Limit (Alabama) is the maximum acceptable dose of a specific toxin (like EO) a patient can be exposed to. It is calculated based on tolerable intake and biological factors.
$$TE = TI \times BW \times UTF$$
$BW$: Body Weight (kg)
$UTF$: Utilization Factor
Current ISO 10993-7 Allowable Limits
| Exposure Category | Duración del contacto | EO Limit (mg/d) | ECH Limit (mg/d) |
|---|---|---|---|
| Limited Exposure | First 24 Horas | 4.0 | 9.0 |
| Prolonged Exposure | 1 – 30 Días | 2.0 | 2.0 |
| Permanent Exposure | > 30 Días | 0.1 | 0.4 |
Methods of EtO Residual Analysis
To determine the residue levels, Ethylene Oxide sterilization technology relies on two primary extraction methods. Either method is sufficient for regulatory compliance:
This method replicates the actual patient exposure during normal product use. It extracts only the fraction of Residuos de EtO that the patient would likely interact with.
This method estimates the total majority of Residuos de EtO within the device through repeated extractions until negligible amounts remain.
Ensure Compliance with BOCON BCS Series
Achieving these strict Ethylene Oxide residual limits requires a high-performance sterilization cycle. BOCON Esterilizadores ETO serie BCS are engineered with advanced vacuum and heated aeration protocols to accelerate gas removal. Our equipment helps manufacturers streamline ISO 10993-7 compliance while maintaining rapid production turnarounds.
