Why Sterilization Method Selection Matters
For medical devices intended to be supplied sterile, selecting the appropriate sterilization method is one of the most consequential decisions in product development. The choice affects material compatibility, packaging design, regulatory strategy, turnaround time, and cost.
Ethylene Oxide (EO) Sterilization
EO sterilization uses a gas that penetrates packaging and device materials to kill microorganisms. It is compatible with a wide range of materials including plastics, electronics, and heat-sensitive components. Typical cycle times range from 10–48 hours including aeration. Primary concerns include EO residual limits (FDA/ISO 10993-7) and environmental emissions management.
Gamma Irradiation
Gamma irradiation uses cobalt-60 radioactive sources to deliver ionizing radiation that destroys microbial DNA. It offers deep penetration, no residuals, and fast turnaround. The primary limitation is potential material degradation, particularly in certain plastics, adhesives, and electronics exposed to high doses.
Electron Beam (E-Beam) Sterilization
E-beam sterilization uses accelerated electrons to deliver a high dose rate in a very short exposure time. It offers excellent dose control and faster throughput than gamma, with less penetration depth—making it best suited for lower-density products.
How to Choose
The selection process involves material compatibility testing, validation per ISO 11135/11137, packaging qualification, and regulatory considerations. Command Medical's team guides clients through method selection and sterilization validation with experienced partners.
