The Korean Medical Device Law classifies medical devices into four categories (ⅰ, ⅱ, ⅲ and ⅳ).
Class ⅰ : medical devices with little potential danger;
Class ⅱ : medical devices with low potential danger;
Class iii: medical devices with moderate potential danger;
Class ⅳ : high-risk medical devices. Classification of medical devices based on: degree of risk, contact area and contact time with human body, product safety and effectiveness.