Manufacturers will have the transition period to apply for certification under the MDR for devices currently certified under the Medical Devices Directive (MDD). Certificates issued to the MDD during the transition period will remain valid for the entirety of their certification period (no longer than five years), unless that exceeds four years after the date of application. If you do not receive certification during the transition period, and your MDD certificate expires, you will have to remove products from the market in the EU until they have been certified under the MDR.