unit of use
as defined in Regulation (EU) 2017/746 of the European Parliament and of the Council of…
4.
if applicable, the ‘unit of use’ UDI-DI (where a UDI is not labelled on the device at the level of its ‘unit of use’, a ‘unit of use’ UDI-DI shall be assigned so as to associate the use of a device with a patient),