Medical Device Reprocessing Association of Ontario (MDRAO) Practice Exam

How are most single-use medical devices typically sterilized?

1. By autoclaving

2. By chemical disinfection

3. By gamma irradiation

4. By steam sterilization

The correct answer is: By gamma irradiation

Most single-use medical devices typically undergo sterilization through gamma irradiation. This method is particularly effective for materials that are sensitive to heat, moisture, or pressure, making it an optimal choice for a wide range of plastic devices that cannot withstand traditional sterilization methods like steam. Gamma irradiation uses high-energy gamma rays to penetrate the product and kill microbial life, ensuring that the devices are sterile and safe for use in medical settings. Gamma irradiation is a preferred sterilization method for single-use devices as it does not require high temperatures or prolonged exposure times, which can compromise the integrity of certain materials. This sterilization method is also effective in eliminating a broad spectrum of pathogens, achieving sterility assurance levels that meet regulatory requirements. In contrast, other sterilization methods such as autoclaving or steam sterilization involve high heat and pressure, which could potentially damage or degrade some single-use devices. Chemical disinfection is typically not suitable for achieving the level of sterility required for devices intended for invasive procedures. Therefore, gamma irradiation is often the best method for sterilizing single-use medical devices while ensuring their functionality and safety upon usage.