Unique Device Identification (UDI) is the electronic identity card of medical device products. The unique identification data carrier is the medium for storing or transmitting the unique identification of medical device. The unique identification database is the database for storing the product identification and associated information of the unique identification of medical device. The three together form the unique identification system of medical device.

The unique identification of medical devices includes product identification (DI) and production identification (PI). The product identification is the unique code that identifies the registrant/registrant, the model, specification and packaging of the medical device; The production identification consists of the codes of the relevant information of the medical device production process. According to the regulatory and practical application requirements, it can include the serial number of the medical device, production batch number, production date, expiration date, etc.