Class II active medical devices include thermometers, sphygmomanometers, electrocardiographic diagnostic instruments, medical cotton wool, medical gauze, thermostatic incubators, glass cupping apparatus, X-ray radiographs, ultrasound, microscopes, biochemistry instruments and so on. Class II medical devices refers to the need for effectiveness should be controlled medical devices, in general, the product mechanism of Class II medical devices has been internationally and domestically recognized, technologically mature.