Sterilization is a validated process used to render a product free from viable microorganisms. Common modalities include ethylene oxide (EO), gamma radiation, electron beam, and steam. Each method follows its own standard: ISO 11135 for ethylene oxide, ISO 11137 for radiation and ISO 17665 for moist heat. A sterility assurance level of 10^-6 is the usual target for terminally sterilized devices. FDA has pushed to reduce ethylene oxide emissions, and EPA rules finalized in 2024 have led manufacturers to explore alternatives such as vaporized hydrogen peroxide.

Why it matters

FDA has prioritized reducing EO use due to environmental concerns, accelerating adoption of alternative modalities under ISO 11135 and related standards.

Common pitfalls

•Failing to re-validate sterilization processes after significant product or process changes can lead to non-sterile devices.
•Assuming a sterilization method validated for one device material or design is automatically suitable for another can result in sterilization failures.
•Inadequate documentation of sterilization validation and routine process control can lead to regulatory non-compliance during audits.
•Choosing a sterilization modality solely based on cost without considering material compatibility and biological safety can compromise device integrity and patient safety.
•Not performing routine biological indicator testing or dose audits can obscure a failing sterilization process until a recall is necessary.

Sources

FDA Sterilization · FDA
ISO 13485 Standard Page · ISO
GHTF/IMDRF Process Validation Guidance · IMDRF/GHTF

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Common comparison patterns

Regulatory pathway choice - 510(k) vs PMA, 510(k) vs De Novo, Abbreviated vs Special 510(k).
Quality systems - QSR vs ISO 13485, QMSR vs QSR.
Software classification - SaMD vs SiMD, Locked vs adaptive AI.
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