Shantou Institute of Ultrasonic Instruments Co., Ltd. (Siui)

Siui manufactures digital color Doppler ultrasound imaging systems, including the Apogee 5500, Apogee 5300, and Apogee 5800 models. These are medical imaging devices used for diagnostic purposes.

Siui is based in the United States. The company operates from its headquarters in the US, where it designs and manufactures its ultrasound imaging systems.

Siui's devices are listed in the FDA 510(k) registry. This means they have been notified to the FDA and are cleared for market under the 510(k) process, which is for devices deemed substantially equivalent to existing devices.

Siui's ultrasound imaging systems are classified as Class II medical devices. Class II devices are those that require more regulation than Class I but less than Class III, and they typically require special controls to ensure their safety and effectiveness.