EU MDR class helper

FAQ

How does EU MDR Annex VIII decide Class I, IIa, IIb or III?

Regulation (EU) 2017/745 Annex VIII is a risk-based rule set. Classification follows the device’s intended purpose and factors such as invasiveness, duration of use, body contact, whether the device is active, and whether software provides information used for diagnosis or therapy. If several rules or sub-rules apply, Annex VIII §3.5 says the strictest rule that yields the higher class applies. This helper is a first-pass sketch, not a notified-body determination.

What do transient, short-term and long-term mean under Annex VIII?

Annex VIII Chapter I defines duration of continuous use: transient is normally less than 60 minutes, short-term is normally between 60 minutes and 30 days, and long-term is normally more than 30 days. §3.6 explains how temporary interruptions and immediate like-for-like replacements count toward continuous use. Match your intended-purpose wording to those definitions before locking a class.

How does Rule 11 classify software / SaMD?

Under Annex VIII Rule 11, software that provides information used to take decisions with diagnosis or therapeutic purposes is Class IIa by default. It is Class III when those decisions may cause death or an irreversible deterioration of a person’s state of health, and Class IIb when they may cause a serious deterioration of a person’s state of health or a surgical intervention. Software that monitors physiological processes is Class IIa, or Class IIb when it monitors vital physiological parameters whose variation could result in immediate danger. All other software is Class I. Software that drives or influences a device takes that device’s class (§3.3).

When do surgically invasive or implantable devices land in Class III?

Rules 6–8 start surgically invasive and implantable devices at Class IIa or IIb, then push many of them to Class III for direct contact with the heart, central circulatory system or central nervous system, for biological effect or absorption, for administering medicinal products, for active implantable devices, breast implants, surgical meshes, joint replacements and certain spinal implants, among other listed exceptions. Confirm the exact sub-rule against the intended purpose rather than relying on a single checkbox.

Do Class I sterile, measuring or reusable surgical instruments stay Class I?

Yes for the class letter, with a conformity-assessment twist. MDR Article 51 still places them in Class I, but Article 52(7) requires notified-body involvement for the aspects related to sterility (Is), metrology (Im) or reuse (Ir). This helper does not model those up-classification pathways; treat sterile, measuring and reusable surgical instruments as special Class I cases in your technical documentation plan.

Does an EU MDR class equal an FDA class or 510(k)/PMA path?

No. EU MDR classes (I–III) and FDA classes (I–III) use different frameworks, and US marketing routes (510(k), De Novo, PMA, HUD) are separate from Annex VIII. Use this helper for an EU first pass, then confirm the US route with a pathway analysis. The same intended purpose can land differently on each side of the Atlantic.