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10 core medical-device terms every newcomer should know, explained
Medical devices are a heavily regulated field, and the terminology is the language of its rules. Here are the 10 most-cited core terms, explained in one pass for onboarding and cross-team communication.
Market routes: 510(k) and PMA
- 510(k): a US FDA premarket notification. Submitted before low/moderate-risk devices (Class I/II, with some Class III exceptions) enter the US market, on a 'substantial equivalence' (compare to a marketed device) route;
- PMA (premarket approval): the FDA's scientific and regulatory review for highest-risk (Class III) devices, requiring sufficient scientific evidence (usually clinical data) on an 'independent proof' route, akin to a device-grade NDA. Implantable pacemakers and heart valves typically fall here.
Regional access: NMPA and CE
- NMPA: China's National Medical Products Administration, formerly CFDA (renamed after the 2018 reform). Regulation follows the Regulations on the Supervision and Administration of Medical Devices (State Council Order 739) and supporting rules, managed in three risk classes;
- CE marking: the EU conformity mark; for devices it rests mainly on MDR (2017/745) and IVDR (2017/746). It requires a technical file (risk management, clinical evaluation, performance and biocompatibility), and high-risk products must pass a notified body.
Product type: IVD and SaMD
- IVD (in-vitro diagnostic device): reagents/instruments/systems that test human samples (blood, urine, tissue, body fluids) outside the body; itself a subclass of medical devices, risk-classified by jurisdiction;
- SaMD (software as a medical device): software that achieves a medical purpose without being part of a hardware device, able to run on phones/tablets/cloud. Unlike software inside a device (SiMD); regulation stresses 'risk-based scalability' and explores pre-certification and machine-learning change management.
Systems and traceability: QMS, CAPA, GCP, UDI
- QMS (quality management system): a system spanning organization, responsibilities, procedures, processes and resources; devices must conform to ISO 13485 and national rules (e.g. FDA 21 CFR 820);
- CAPA (corrective and preventive action): a systemic process to identify, investigate and correct nonconformities, eliminate root causes and prevent recurrence; mandated by ISO 13485 and the FDA, and a defective CAPA is a critical finding in inspections;
- GCP (good clinical practice): the international ethical and scientific standard protecting subjects and ensuring data integrity, with a device-specific standard (e.g. ISO 14155);
- UDI (unique device identification): a DI (static, identifying maker and model) plus a PI (dynamic: lot, serial, expiry), human- and machine-readable, supporting lifecycle traceability and recall.
The BIO angle
FAQ
What is the difference between 510(k) and PMA?
510(k) is a 'substantial equivalence' comparison route for low/moderate-risk devices; PMA is an 'independent proof' route for highest-risk (Class III) devices, usually requiring clinical data, akin to a device-grade new-drug application.
What do NMPA, CE and FDA each cover?
NMPA is China's regulator, CE marking corresponds to the EU's MDR/IVDR, and the FDA is the US regulator. Exporting to different markets requires the matching access route and technical files.
What is UDI made of?
A DI (device identifier, static, identifying maker and model) and a PI (production identifier, dynamic, with lot, serial and expiry), human- and machine-readable, supporting traceability and recall.
Do material suppliers relate to these terms?
Yes. A customer's QMS, CAPA, registration files and UDI traceability all rely on upstream material TDS/CoA, biocompatibility data and lot traceability; material documentation is part of the device compliance chain.
Related reading
- US Unique Device Identification (UDI) at a Glance: Rules, Format, Exemptions and GUDID | BIO Insights
- Reading ISO 13485 Through PDCA: the Logic Behind the Quality System | BIO Insights
- Device Biological Evaluation and Test Standards (ISO 10993 / GB/T 16886) at a Glance | BIO Insights
Note: an original analysis compiled from public industry information; figures and conclusions per official/original sources. Not investment advice.
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