The first category is low-risk medical instruments, which can be guaranteed to be safe and effective through routine management, such as surgical instruments (knives, scissors, pliers, clips, needles, hooks), novel instruments (without electricity), mirrors, reflective lamps, medical magnifying glasses, scraping plates (for traditional Chinese medicine), plasters, breathable tapes, surgical gowns, surgical caps, inspection gloves, surgical covers, etc. The second category is medical devices with moderate risks that need strict control and management to ensure their safety and effectiveness, such as sphygmomanometer, thermometer, electrocardiograph, electroencephalograph, operating microscope, acupuncture needle (special for Chinese medicine), hearing aid, skin suture nail, condom, contraceptive cap, sterile medical gloves, sleep monitoring system software, ultrasonic three-dimensional system software, pulse meter software, etc. The third category is high-risk medical devices that need special measures and strict control and management to ensure their safety and effectiveness, such as pacemakers, external counterpulsation devices, vascular endoscopes, ultrasonic tumor focusing knives, high-frequency electrotome, microwave scalpel, medical magnetic resonance imaging equipment, drill 60 therapeutic apparatus, positron emission tomography (PECT) devices, implantable devices, implantable artificial organs, vascular stents and intravascular catheters.