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Medical Device – Definition, Classes and Regulation

A medical device is an instrument, apparatus, or substance intended for diagnostic or therapeutic purposes. It is subject to strict regulatory approval requirements.

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Things worth knowing about "Medical Device"

A medical device is an instrument, apparatus, or substance intended for diagnostic or therapeutic purposes. It is subject to strict regulatory approval requirements.

What Is a Medical Device?

A medical device is any instrument, apparatus, appliance, software, implant, reagent, material, or other article intended by the manufacturer to be used for human beings for one or more specific medical purposes. The principal intended action of a medical device is not achieved by pharmacological, immunological, or metabolic means – this is the key distinction between a medical device and a medicinal product (drug).

Medical devices can be used for the diagnosis, prevention, monitoring, prediction, prognosis, treatment, or alleviation of disease. They also include products intended to investigate, replace, or modify the anatomy or a physiological process, as well as products supporting contraception.

Legal Framework

In the European Union, the term medical device is defined and regulated by the EU Medical Device Regulation (MDR, Regulation (EU) 2017/745), which replaced the older Directive 93/42/EEC. This regulation imposes stricter requirements on safety, clinical evaluation, and post-market surveillance. Products placed on the European market must carry the CE marking, indicating their conformity with applicable regulations.

In the United States, medical devices are regulated by the Food and Drug Administration (FDA) under the Federal Food, Drug, and Cosmetic Act.

Classification of Medical Devices

Medical devices are classified according to their potential risk to patients and users:

Class I: Low risk (e.g., bandages, walking aids, wheelchairs)
Class IIa: Medium risk (e.g., hearing aids, contact lenses, ultrasound equipment)
Class IIb: Higher risk (e.g., ventilators, defibrillators, X-ray equipment)
Class III: High risk (e.g., heart valves, coronary stents, cochlear implants)

As the risk class increases, so do the requirements for clinical evidence, conformity assessment, and ongoing surveillance.

Examples of Medical Devices

The range of medical devices is extremely broad. Common examples include:

Diagnostic devices such as blood pressure monitors and blood glucose meters
Implants such as hip prostheses, pacemakers, and dental implants
Surgical instruments such as scalpels and forceps
Wound care and dressing products
Software as a medical device (e.g., diagnostic algorithms, health monitoring apps)
In vitro diagnostics (IVD) such as pregnancy tests and COVID-19 rapid tests

Clinical Evaluation and Safety

Manufacturers of medical devices are required to conduct a clinical evaluation to demonstrate the safety and performance of their product based on clinical data. This can be done through clinical investigations, review of scientific literature, or post-market clinical follow-up.

After a device is placed on the market, manufacturers are also obligated to conduct post-market surveillance and report serious incidents or recalls to the relevant competent authorities – a process known as vigilance.

Difference Between Medical Devices and Medicinal Products

A commonly asked question concerns the difference between medical devices and medicinal products (drugs). While medicinal products achieve their principal action through pharmacological, immunological, or metabolic means, a medical device achieves its principal intended action by physical or mechanical means. Combination products – such as a drug-eluting stent – are subject to special regulatory rules.

References

European Parliament and Council of the EU: Regulation (EU) 2017/745 on Medical Devices (MDR), Official Journal of the EU, 2017.
U.S. Food and Drug Administration (FDA): Overview of Medical Device Regulation. Available at: https://www.fda.gov/medical-devices
Yock, P.G., Zenios, S., Makower, J. et al.: Biodesign: The Process of Innovating Medical Technologies. Cambridge University Press, 2015.

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