Whether your product is a medical device under the MDR is the single most important regulatory question you will answer. It determines whether you need CE marking, whether you need a quality management system, whether you face Notified Body audits, and whether your timeline to market is months or years. The answer lives in Article 2(1) of Regulation (EU) 2017/745.

Here is the definition, what it means in practice, and how to apply it to your product.

Article 2(1) of the MDR defines a medical device as:

Any instrument, apparatus, appliance, software, implant, reagent, material, or other article intended by the manufacturer to be used, alone or in combination, for one or more of the following specific medical purposes:

  • Diagnosis, prevention, monitoring, prediction, prognosis, treatment, or alleviation of disease
  • Diagnosis, monitoring, treatment, alleviation of, or compensation for an injury or disability
  • Investigation, replacement, or modification of the anatomy or of a physiological or pathological process or state
  • Providing information by means of in vitro examination of specimens derived from the human body, including organ, blood, and tissue donations

And which does not achieve its principal intended action by pharmacological, immunological, or metabolic means, in or on the human body, but which may be assisted in its function by such means.

The definition also explicitly includes devices for the control or support of conception, and products specifically intended for the cleaning, disinfection, or sterilization of medical devices .

What Is the Key Phrase in This Definition?

"Intended by the manufacturer." These four words are the hinge on which everything turns.

The MDR does not classify products based on what they technically can do. It classifies them based on what the manufacturer intends them to do. Your intended purpose — as expressed in your labeling, instructions for use, promotional materials, and clinical evaluation — determines whether your product is a medical device.

This means the exact same piece of hardware or software can be a medical device or not, depending entirely on the claims the manufacturer makes about it. A heart rate monitor marketed for fitness tracking is not a medical device. The same heart rate monitor marketed for detecting atrial fibrillation is a medical device. The technology is identical. The intended purpose makes the difference.

Tibor has seen this play out with real consequences. One company he worked with spent months pursuing MDR certification before realizing they could modify their intended purpose statement — not the technology, not the product, just the regulatory positioning — and launch as a wellness product first. Months of work and budget, wasted because the intended purpose question was not addressed before any other decision was made.

How Do You Determine If Your Product Meets This Definition?

Work through these three questions:

Question 1: Does your product have a medical purpose as listed in Article 2(1)?

Go through the list. Is your product intended for diagnosis? Prevention? Monitoring? Treatment? Prediction? Prognosis? Alleviation of disease or disability? If your product is intended for any of these purposes — even if that purpose is secondary to a primary non-medical purpose — it likely falls under the definition.

The word "intended" is critical here. If you market a product as a general wellness tool but include claims about detecting health conditions, the medical purpose claim brings the product into scope.

Question 2: Does your product achieve its action pharmacologically, immunologically, or metabolically?

If yes, it is not a medical device — it is a medicinal product, regulated under pharmaceutical legislation. Medical devices achieve their principal intended action by physical means: mechanical, thermal, electrical, radiation-based, or through software algorithms. If the principal mechanism of action is pharmacological (chemical interaction with the body), immunological (acting on the immune system), or metabolic (affecting metabolic processes), the product is a medicine, not a device.

Note the word "principal." A device can have secondary pharmacological or metabolic effects and still be a medical device, as long as those effects are ancillary to the principal physical mechanism of action. Drug-device combination products have their own rules — see Combination Products Under MDR: Drug-Device and Biologic-Device Rules for Startups.

Question 3: Is your product software?

Software can be a medical device under the MDR if it meets the intended purpose criteria. The MDR explicitly includes "software" in the Article 2(1) definition. Standalone software — meaning software that is not part of a hardware medical device — is regulated as a medical device in its own right if it has a medical intended purpose.

This is a major change from the old MDD framework, where standalone software often fell outside the regulatory scope. Under the MDR, software intended for diagnosis, monitoring, or treatment is a medical device and must be classified according to Rule 11 of Annex VIII .

MDCG 2019-11 provides detailed guidance on the qualification and classification of software as a medical device .

What About Products with Both Medical and Non-Medical Functions?

Many startup products straddle the line. A smartwatch that tracks heart rate for fitness and also claims to detect irregular heartbeats. A mental health app that provides general wellness content and also claims to treat anxiety. A sleep tracker that monitors patterns and also claims to diagnose sleep disorders.

The MDR's approach is clear: if the product has a medical intended purpose, even if it also has non-medical purposes, it is a medical device. You cannot escape regulation by bundling a medical function with non-medical functions.

However, you can make strategic decisions about which claims to make. If you remove the medical claims and market purely for wellness, fitness, or general wellbeing, the product may fall outside the MDR's scope. This is a legitimate strategic choice — but it must be genuine. If your marketing materials, sales conversations, or published studies imply a medical purpose, competent authorities can determine that the product is a medical device regardless of what your official intended purpose statement says.

We cover this strategic decision in detail in Borderline Products Under MDR: How to Determine If Your Innovation Is a Medical Device and The Beachhead Strategy: Launching as Wellness First, Then Transitioning to Medical Device.

What About Annex XVI Devices (No Intended Medical Purpose)?

The MDR broke new ground by including certain product groups that have no medical intended purpose but pose similar risks to medical devices. These are listed in Annex XVI and include:

  • Contact lenses and other items intended to be introduced into or onto the eye
  • Products intended to be totally or partially introduced into the human body through surgically invasive means for the purpose of modifying the anatomy or fixation of body parts (excluding tattoo products and piercings)
  • Substances, combinations of substances, or items intended to be used for facial or other dermal or mucous membrane filling by subcutaneous or submucosal injection
  • Equipment intended to be used to reduce, remove, or destroy adipose tissue (liposuction, lipolysis, lipoplasty)
  • High-intensity electromagnetic radiation (e.g., infrared, visible, ultraviolet) intended for use on the human body (including laser and intense pulsed light sources) for skin resurfacing, tattoo removal, hair removal, or other skin treatment
  • Equipment intended for brain stimulation applying electrical currents or magnetic or electromagnetic fields that penetrate the cranium

These products will be subject to the MDR's general safety and performance requirements once common specifications are adopted by the Commission. The practical impact for startups: if your product falls into one of these categories, monitor the common specification adoption timeline — you will need to comply even without a medical intended purpose.

Real-World Classification Decisions

Let me be honest about something: the definition in Article 2(1) looks clear on paper, but applying it to real products can be genuinely difficult. Here are examples from Tibor's practice:

Clear medical device: A software algorithm that analyzes retinal images to detect diabetic retinopathy. Medical purpose (diagnosis of disease), software-based, clearly falls under Article 2(1).

Clear non-medical device: A fitness tracker that counts steps and estimates calories burned. No medical claims, no diagnostic purpose, general wellness. Not a medical device.

Borderline case: A wearable that measures blood oxygen saturation and alerts the user when levels drop below a threshold. Is it a medical device? If marketed for "monitoring your SpO2 for general wellness awareness" — arguably not. If marketed for "monitoring your blood oxygen levels to detect early signs of respiratory conditions" — clearly yes. The technology is identical. The intended purpose determines the answer.

Borderline case: A mobile app that guides breathing exercises. If marketed for "relaxation and stress reduction" — general wellness. If marketed for "treatment of anxiety disorder" — medical device. If marketed for "managing symptoms of COPD through breathing exercises" — medical device.

When you are in the borderline zone, the safest approach is to consult the MDCG guidance on borderline and classification (MDCG 2021-24 ) and, if still unclear, seek a formal opinion from your national competent authority.

What Happens If You Get This Wrong?

The consequences of misclassifying your product run in both directions:

If you treat a non-medical product as a medical device: You spend unnecessary time and money on MDR compliance. This is wasteful but not dangerous.

If you treat a medical device as a non-medical product: You place an unregulated medical device on the market. This is a violation of Article 5 of the MDR, which prohibits placing a device on the market unless it conforms to the regulation. Consequences include market surveillance actions, product recall, fines, and — if a patient is harmed — potential criminal liability depending on the member state.

The asymmetry is clear: the cost of wrongly assuming you are regulated is money. The cost of wrongly assuming you are not regulated is existential.

The Practical First Step

Before you do anything else — before you build a prototype, before you raise funding, before you hire a regulatory consultant — answer this question: Is my product a medical device under Article 2(1) of the MDR?

If the answer is clearly yes: plan your regulatory strategy around the MDR from day one.

If the answer is clearly no: document why. Keep records of your intended purpose analysis. If your product evolves toward medical claims later, reassess.

If the answer is unclear: get clarity before committing resources. This is the highest-ROI regulatory investment a startup can make. A few hours with someone who understands Article 2(1) and the classification rules can save you months of misdirected effort.

Next: MDR Scope: When Does a Product Fall Under the Medical Device Regulation? — where we go beyond the definition to explore the full scope of what the MDR covers.