A harmonized standard for medical devices is a European standard developed by a European standardization organization following a standardization request from the Commission, the reference of which has been published in the Official Journal of the European Union. According to Article 8(1) of Regulation (EU) 2017/745, products that comply with such standards or relevant parts thereof are presumed to be in conformity with the corresponding requirements of the Regulation. This presumption of conformity applies not only to product requirements but also explicitly to system or process requirements for economic operators, including quality management systems, risk management, post-market surveillance, clinical investigations, clinical evaluation, and clinical follow-up. The decisive factor is therefore not the existence of a standard, but the official listing of its reference.
From Standardization Request to Presumption of Conformity
The process begins with a standardization request from the Commission to CEN and CENELEC, specifying the requirements of the Regulation to be covered and the timeframe. The standardization organization develops or revises the standard, often by adopting an international ISO or IEC standard with a European annex documenting the mapping to the general safety and performance requirements. Subsequently, the Commission reviews the standard and publishes the reference in the Official Journal via an implementing decision.
The presumption of conformity only arises upon this publication, and only to the extent of the requirements specified in the decision. It serves as a facilitation of proof, not a fiction of conformity: the manufacturer must still demonstrate that the standard is relevant to their product and its intended purpose, that they apply it in full, and that any remaining requirements are met by other means. Article 8(2) also extends the presumption of conformity to relevant monographs of the European Pharmacopoeia, particularly regarding sutures and interactions between medicinal products and the materials of devices in which they are contained.
Status of Harmonization under the Regulation
The basis is Implementing Decision (EU) 2021/1182 of July 16, 2021, which was amended and expanded by Decisions (EU) 2022/6, (EU) 2022/757, (EU) 2023/1410, and (EU) 2024/815. The consolidated list includes approximately 25 references and is heavily focused on sterilization, packaging, biocompatibility, and management systems. Listed standards include EN ISO 13485:2016 including AC:2018 and A11:2021 for quality management systems, EN ISO 14971:2019 including A11:2021 for risk management, EN ISO 15223-1:2021 for symbols, several parts of the EN ISO 10993 series for biological evaluation, EN ISO 11135 and EN ISO 11137 for sterilization, EN ISO 11607-1 and -2 for packaging, and EN ISO 17664-1 and -2 for processing information.
The inventory is thus much thinner than under the previous directives. Key practical standards are not listed, such as IEC 62366-1 for usability and ISO 14155 for good clinical practice in clinical investigations. Their application remains the professionally recognized state of the art and is expected by Notified Bodies, but it does not trigger a presumption of conformity under Article 8. The manufacturer must then independently justify and document compliance with the respective requirements of the Regulation.
Distinction from National Standards, Common Specifications, and Guidelines
A non-harmonized international or national standard must be distinguished from a harmonized standard. While it can be used as state of the art, it is only one element of the evidence; the publication of the reference in the Official Journal is missing, and thus the legal consequence. Similarly, European standards without a standardization request, which have EN status but are not listed, must be treated separately.
Common specifications are a distinct instrument: the Commission may adopt them via implementing acts under Article 9 if no harmonized standards exist or if they are insufficient; they are binding in the sense that the manufacturer must comply with them or demonstrate an at least equivalent solution. In contrast, guidelines from the Medical Device Coordination Group are neither standards nor legal acts; they describe the agreed interpretation of the Regulation and do not create a presumption of conformity. The system of common specifications is covered in the entry “Common Specifications”.
Relevance for clinical trials
The gap in the list of standards is practically significant for clinical evidence. Because the central standard for good clinical practice in clinical investigations of medical devices is currently not listed in the Official Journal, its application does not create a presumption of conformity for Articles 62 to 80 and Annex XV. Investigation plans, monitoring concepts, and reports must therefore be explicitly mapped against the requirements of the Regulation itself, rather than relying on standard compliance.
Conversely, listed standards provide relief elsewhere: risk management according to EN ISO 14971, biological evaluation according to the EN ISO 10993 series, and the quality management system according to EN ISO 13485 provide recognized evidence building blocks upon which the clinical evaluation can be based. Full-service CROs like Mediconomics support manufacturers in clarifying for each evidence element whether a listed standard supports the requirement or whether an independent justification is necessary, and in documenting this mapping in an auditable manner.
Frequently Asked Questions (FAQ)
When does the presumption of conformity arise?
Only upon publication of the reference to the standard in the Official Journal of the European Union, and only for the requirements of Regulation (EU) 2017/745 specified in the respective implementing decision.
Is the application of a harmonized standard mandatory?
No. The manufacturer can also meet the requirements in other ways, but must then demonstrate and justify the equivalence of the chosen solution themselves. The standard is the simpler path, not the only one.
Are ISO 13485 and ISO 14971 harmonized under the Regulation?
Yes. EN ISO 13485:2016 with AC:2018 and A11:2021, as well as EN ISO 14971:2019 with A11:2021, are included in the list for Implementing Decision (EU) 2021/1182 as amended. In contrast, IEC 62366-1 is not listed there.
Regulatory References
- Regulation (EU) 2017/745, Article 8 – Presumption of conformity through harmonized standards and monographs of the European Pharmacopoeia.
- Regulation (EU) 2017/745, Article 9 – Common specifications as a secondary instrument.
- Implementing Decision (EU) 2021/1182 as amended by Decisions (EU) 2022/6, 2022/757, 2023/1410, and 2024/815 – List of harmonized standards.
- Regulation (EU) No 1025/2012 – Procedures for standardization requests and publication of references.
- Regulation (EU) 2017/745, Annex I – General safety and performance requirements as the reference point for standard mapping.
