The transition from the Medical Devices Directive (MDD) to the Medical Devices Regulation (MDR) represents one of the most significant shifts in European medical device regulation. With the MDD certificates officially expiring on May 26, 2024, manufacturers must confirm that their CE-MDR certificates are valid and fully compliant. This article explains the critical differences between old MDD certification and new MDR-based certification, why legacy MDD certificates no longer offer market access, and practical steps to verify and maintain valid CE-MDR certification.

First, understanding the timeline is essential. Under the EU MDR (2017/745), all medical devices marketed in the European Economic Area must comply with the new regulation. While transitional provisions allowed certain MDD-certified devices to remain on the market under specific conditions, these provisions ended on May 26, 2024. After this date, any device without a valid CE-MDR certificate is considered non-compliant. Notably, devices that had valid MDD certificates and were already placed on the market before the deadline may continue to be available until their individual certificate expiry, but no new devices can rely on MDD certification alone.

The key distinction between MDD and MDR certification lies in the depth of assessment. MDD certification was based on limited clinical evidence and often relied on equivalence claims. In contrast, MDR certification requires comprehensive clinical evaluation, including robust post-market surveillance, unique device identification (UDI), and updated technical documentation. Notified bodies now apply stricter scrutiny to every certification application. Therefore, simply holding an old MDD certificate does not automatically transfer to MDR compliance. Manufacturers must have submitted a formal application for MDR certification and received a significant increase in their surveillance audit before the transition deadline.

To confirm the validity of your CE-MDR certificate, manufacturers should take the following steps:

1. Check the certificate issue date and expiry date. Any certificate issued after May 26, 2024 must explicitly reference the MDR Annex IX or Annex X and show the notified body code (e.g., NB 0123). Certificates referencing only the MDD (e.g., Annex II or Annex V) are invalid for new market access.

2. Verify the scope of the certificate. MDR certificates clearly list the device categories, intended purposes, and any limitations. If your certificate still uses MDD classification rules (e.g., Class II B based on MDD), it must be updated to MDR classification rules (e.g., Class IIb under MDR). Mismatched classification indicates invalidity.

3. Confirm the notified body is designated under MDR. Not all notified bodies that previously handled MDD certification are automatically designated for MDR. The European Commission publishes a list of designated MDR notified bodies (e.g., NB 0123, NB 0459). If your notification body is not on this list, your certificate is not valid under MDR.

4. Assess your technical file. MDR requires significantly more clinical data, including clinical evaluation reports (CER) that comply with MEDDEV 2.7/1 Rev.4 or MDR-specific guidance. If your technical documentation still mirrors MDD requirements—without adequate clinical follow-up, post-market surveillance plan, or risk management updates—the certificate may be non-compliant when questioned by regulators.

5. Review post-market surveillance (PMS) obligations. MDR mandates a PMCF plan and periodic safety updates even for legacy devices. Without these active systems, a certificate can be suspended or withdrawn, even if it was initially valid.

Another critical point involves the "grandfathering" myth. Some manufacturers believed that devices already on the market before MDR could keep their MDD certificates indefinitely. This is incorrect. The transition stipulated that devices with MDD certificates could only continue to be placed on the market until their certificate expiry or until May 26, 2024, whichever was earlier. After that, only devices with a valid MDR certificate can be placed on the market for the first time. Any device not meeting this requirement is subject to removal from the market, and competent authorities may issue sanctions.

For manufacturers currently holding a valid MDD certificate that still has time left, it is critical not to wait. The notified body capacity is limited. Many have large backlogs, and receiving a new MDR certificate can take 12 to 18 months. To avoid market disruption, apply for MDR certification immediately, even if your MDD certificate has several years remaining. This proactive approach ensures a smooth transition and prevents gaps in market access.

Additionally, manufacturers must be aware of the specific transitional rules for custom-made devices, active implantable devices, and IVDs under the IVDR. While the medical device regulation now aligns, separate timelines exist for IVDs, with some Class D IVDs facing later deadlines. Always cross-check your specific device type.

Finally, remember that certificate validity is not a one-time check. Once your CE-MDR certificate is obtained, you must maintain compliance through surveillance audits, vigilance reports, and regular updates to PMS documentation. Any significant change to the device design or intended use may require a new certification. The MDR also introduces stricter requirements for subcontractors and suppliers, so any change in the supply chain must be notified and assessed.

In conclusion, the era of relying on old MDD certification is over. To legally market medical devices in Europe, manufacturers must hold a valid CE-MDR certificate that aligns with the full requirements of EU MDR 2017/745. By verifying the notified body's designation, the certificate's scope and issue date, and the completeness of technical and clinical documentation, manufacturers can ensure their certification remains valid. The transition demands vigilance, thorough documentation, and timely action. Do not assume legacy certificates are still acceptable—confirm your CE-MDR certificate today to protect your market access and patient safety.