Co-authored by: Benedikt Marijnen, LLM – European Lawyer
In the past year I’ve spoken to hospital 3D lab managers across Europe who were operating under the assumption that Article 5.5 of EU MDR covered their work. It’s an understandable assumption. Article 5.5 is the provision that gives health institutions some breathing room from the full weight of the MDR, and on the surface it seems like it was written with hospital labs in mind.
But for most labs, it doesn’t apply. And the distinction matters enormously for how you set up your compliance framework.
What your lab most likely produces
If your lab receives a CT scan, a DICOM file, and a clinician’s instructions, and you produce an anatomical model, surgical guide or implant for a named patient’s upcoming procedure, you are making a custom-made device.
Take a concrete example: a maxillofacial surgeon requests patient-specific osteotomy guides for a fibula reconstruction. Your team segments the imaging data, designs the guides in CAD, validates the fit on a virtual model, and prints them (or outsources printing) for that patient’s operation. Every step of that workflow is driven by one patient’s anatomy and one clinician’s written instructions.
That is the definition of a custom-made device under EU MDR Article 2(3):
“Any device specifically made in accordance with a written prescription of any person authorised by national law by virtue of that person’s professional qualifications which gives, under that person’s responsibility, specific design characteristics, and is intended for the sole use of a particular patient exclusively to meet their individual conditions and needs.”
One patient. One prescription. One device. The definition is not ambiguous.
So what is Article 5.5, and why doesn’t it apply?
Article 5.5 creates a conditional exemption for devices that a health institution manufactures in-house for use across multiple patients within that institution, specifically where no equivalent device is commercially available.
Recital 30 of the MDR makes the scope explicit:
“Health institutions should have the possibility of manufacturing, modifying and using devices in-house and thereby address, on a non-industrial scale, the specific needs of target patient groups which cannot be met at the appropriate level of performance by an equivalent device available on the market.”
Target patient groups — plural. This is a population-level concept. Think of a specialised surgical instrument your department developed for a specific technique, used routinely on any suitable patient. That is an Article 5.5 device. A surgical guide designed around one patient’s anatomy is not.
The MDR definitions are separate. The pathways are separate. Applying Article 5.5 to custom-made device production is a misclassification.
The conditions for Article 5.5, even if it did apply
For completeness: Article 5.5 is not a blanket exemption even when it does apply. The following conditions must all be met:
- The device is not transferred to another legal entity
- Manufacture and use occur under an appropriate quality management system
- The institution can document that no equivalent device is commercially available at the appropriate level of performance
- The institution informs its competent authority upon request
- An annual list of such devices is published
- Additional requirements apply to Class IIb and Class III devices
If any condition cannot be demonstrated, the exemption falls away and full MDR obligations apply.
What the custom-made pathway actually requires
Custom-made devices are not exempt from the MDR. There is no CE marking requirement, but the regulation applies in full. Specifically:
Annex I — General Safety and Performance Requirements (GSPR) Every custom-made device must meet the GSPRs. This means demonstrating that the device is safe, performs as intended, and that risks are reduced as far as possible.
Annex XIII — Technical documentation A technical file must be established for each device type. This includes design rationale, materials, manufacturing process, validation, and a clinical evaluation.
Declaration of conformity A written statement must be issued for each custom-made device before it is put into service, confirming compliance with the applicable requirements.
Post-market follow-up The manufacturer (your lab), is responsible for monitoring device performance after use and acting on any issues identified.
Quality management system An appropriate QMS must be in place covering the entire production process.
The ISO 13485 question
This comes up constantly. ISO 13485 certification is not a legal requirement for custom-made device manufacturers. You do need a quality management system that covers design controls, production, post-market follow-up, and document management, but the MDR does not mandate ISO 13485 certification specifically.
There is another important point here: ISO 13485 and the MDR are not the same thing, and certification to ISO 13485 does not automatically mean you meet all MDR requirements. The two frameworks overlap significantly but have different scopes. I cover this in detail in a separate article on whether ISO 13485 is necessary for hospital 3D labs.
For hospital 3D labs producing custom-made devices, there are in practice two sensible approaches. The first is to implement a quality system scoped specifically to the MDR custom-made requirements, covering exactly what the regulation asks for, nothing more. This is lean, practical, and fully compliant. The second is to implement in parallel a reduced ISO 13485-aligned system that satisfies MDR obligations now but is structured in a way that allows expansion to full ISO 13485 certification later, if your institution wants to pursue that. Both are legitimate paths, and which one fits depends on your lab’s size, ambitions, and existing infrastructure.
A quick reference: the two pathways side by side
| Custom-Made Device | Article 5.5 Device | |
|---|---|---|
| Basis | Written prescription, named patient | In-house manufacture for institutional use |
| For how many patients? | One, exclusively | Multiple (target patient group) |
| CE marking required? | No | No |
| Full MDR applies? | Yes | No (conditional exemption) |
| Annex I (GSPR) applies? | Yes | Yes |
| Annex XIII applies? | Yes | No |
| QMS required? | Yes | Yes |
| Declaration per device? | Yes | No |
The bottom line
If your lab produces devices to individual patient prescriptions, you are in the custom-made device space. Article 5.5 does not cover your core output. The MDR applies, but with the right framework in place, compliance is entirely achievable without turning your lab into a full blown medical device manufacturer.
The first step is simply getting the classification right. Everything else follows from there.
Questions about how this applies to your 3D lab’s specific situation? Feel free to contact us to explore how structured compliance management for custom-made devices works in practice.