How To Calculate Allowable Limits For تعقيم أكسيد الإيثيلين
Ensuring patient safety is the highest priority in التعقيم بأكسيد الإيثيلين. Medical devices must undergo rigorous EtO residual testing to verify they meet the strict limits defined by ايزو 10993-7. These compounds—Ethylene Oxide (منظمة أصحاب العمل), Ethylene Chlorohydrin (ECH), and Ethylene Glycol (على سبيل المثال)—can be hazardous to health if not properly managed.
The Calculation of Allowable Limits (AL)
ال Allowable Limit (AL) 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 | Contact Duration | EO Limit (mg/d) | ECH Limit (mg/d) |
|---|---|---|---|
| Limited Exposure | First 24 Hours | 4.0 | 9.0 |
| Prolonged Exposure | 1 – 30 Days | 2.0 | 2.0 |
| Permanent Exposure | > 30 Days | 0.1 | 0.4 |
Methods of EtO Residual Analysis
To determine the residue levels, تكنولوجيا التعقيم بأكسيد الإيثيلين 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 بقايا EtO that the patient would likely interact with.
This method estimates the total majority of بقايا 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 دورة التعقيم. بوكون معقمات ETO من سلسلة BCS are engineered with advanced vacuum and heated aeration protocols to accelerate gas removal. Our equipment helps manufacturers streamline ايزو 10993-7 compliance while maintaining rapid production turnarounds.
