Por que usar óxido de etileno (EO) Para esterilização de dispositivos médicos

Horário de publicação: 2024-01-18 | Categoria: Sterilization Science & Material Compatibility

Por que usar óxido de etileno (EO) for Medical Device Sterilization?

Óxido de Etileno (EO) has become the industry standard for low-temperature sterilization. Its primary advantage lies in its exceptional material compatibility—it can effectively sterilize plastics, polímeros, metals, and glass without the structural degradation caused by high-heat steam or radiation.

The Mechanism: Alkylation

EO works through a chemical reaction called alquilação. It disrupts the DNA of bacteria, viruses, and molds, rendering them unable to reproduce. Unlike other methods, EO penetrates deep into complex geometries like long lumens and multi-layered packaging.

O 4 Critical Factors of Cycle Design

Designing a successful Ciclo de esterilização EO requires a delicate balance of four adjustable parameters:

Temperatura Typically 90°F to 135°F. $$+18^\circ F = 2x \text{ Lethality}$$ Higher temps reduce residue and aeration time.

Umidade Water vapor increases material porosity. Relative humidity (RH) should be >30% for consistent microbial deactivation.

Vacuum Depth Essential for gas penetration. Deep vacuum pulses ensure EO reaches the innermost surfaces of complex devices.

EO Concentration Optimized between 400 mg/L and 800 mg/L. Balancing lethality with minimal residual levels is key.

Validação & Compliance Standards

Before moving to production, manufacturers must conduct “worst-case” stability studies to ensure the cycle doesn’t adversely affect coatings, bonds, or functionality. Formal validation must align with:

ISO 11135:2014: Sterilization of health care products — Ethylene oxide.
ISO 10993-7:2008: Avaliação biológica de dispositivos médicos — Parte 7: Resíduos de esterilização por óxido de etileno.

Precision Control with BOCON BCS Series

The flexibility of Tecnologia de esterilização por óxido de etileno is its greatest strength, but it requires equipment capable of exact parameter control. BOCON's Esterilizadores ETO Série BCS offer industry-leading precision in vacuum depth and humidity regulation. Whether you are sterilizing sensitive electronics or complex catheters, our systems ensure you meet SAL 10⁻⁶ while protecting your high-value materials.