New EU Medical Devices Regulation/In Vitro Diagnostics

The EU MDR (2017/745) and IVDR (2017/746) define the technical evidence manufacturers must provide for the European market. Testing covers scope classification, sample handling, biocompatibility and chemical characterization, sterility, electromagnetic compatibility, performance verification, analytical sensitivity, and conformity assessment. A structured program demonstrates safety and performance with documented, reproducible data that meets notified body expectations.

EU MDR/IVDR testing scope and applicable devices

MDR covers devices from non-invasive products such as dressings and medical gauze through to active implantable systems and software. IVDR covers reagents, instruments and systems used for in vitro examination of specimens. Classification follows rules based on invasiveness, duration of contact, energy supply and diagnostic risk. The class determines the depth of testing required. Class III implants and companion diagnostics sit at the top of the evidence hierarchy. They attract full clinical evaluation and extensive bench data. Lower-class devices may rely on a subset of methods, such as biocompatibility screening and basic performance verification. Related testing areas, including Penetration Testing for Medical Devices where connected software is involved, fall within the same general conformity framework when the device incorporates digital functions.

Sample types and preparation

Test articles should represent the finished device, including all processing, sterilization and packaging steps. Residuals from manufacturing can alter results. Sample forms include the intact device, extracts prepared in polar and non-polar solvents, and sectioned components where localized contact is clinically relevant. Extraction conditions — solvent type, temperature, duration and surface-area-to-volume ratio — must be justified against the intended use and documented in the protocol. For extract-based chemical analysis, glassware is silanized or solvent-rinsed to minimize background interference. Sterility samples are taken from routine production lots after full sterilization cycles. Some devices combine electronics and patient-contact materials, as in home-use medical equipment. In these cases, electrical modules and biomaterial coupons are prepared separately so that EMC and biocompatibility testing do not contaminate each other's conditions.

Biocompatibility

and chemical characterization methods
Biological evaluation generally follows the ISO 10993 series. It begins with material characterization rather than animal testing. Chemical characterization uses gas chromatography–mass spectrometry (GC-MS) for volatile and semi-volatile extractables. High-performance liquid chromatography (HPLC) with UV or mass-spectrometric detection handles non-volatile organics. inductively coupled plasma spectroscopy is used for elemental impurities. Identified compounds are then subjected to toxicological risk assessment against tolerable exposure thresholds. This approach matches the analytical strategies discussed for the EU ban on bisphenol A in food contact materials, where targeted HPLC or GC-MS quantification of specific migrants is required. Where in vitro methods remain necessary, cytotoxicity is assessed by elution assays on mammalian cell cultures, measured spectrophotometrically via viability dyes. Sensitization and irritation now lean heavily on in chemico and in vitro alternatives. This reflects the broader shift toward New Approach Methodologies for Animal Testing.

Sterility,

EMC and performance testing methods
Sterility verification combines sterility testing of finished units in validated isolation or direct-transfer culture with bioburden determination. For radiation-sterilized products, dose audits use resistant bacterial spores. Method suitability must be demonstrated for each product family, since antimicrobial excipients can suppress recovery. Electromagnetic compatibility testing per the IEC 60601 series covers emissions and immunity. This includes electrostatic discharge, radiated fields and surge events. Active devices used in assistive contexts increasingly reference newer framework standards such as those developed for active assisted listening systems, which tighten EMC expectations for connected equipment. Performance verification depends on device type. It includes mechanical strength and absorbency for textile-based dressings, flow and pressure accuracy for infusion devices, and functional bench simulation for surgical instruments. Software-driven functions are verified against defined input-output specifications within the same technical documentation set.

Method sensitivity and repeatability

Analytical sensitivity is established during method validation through detection and quantification limits, linearity, recovery and matrix-effect studies. GC-MS and HPLC-MS methods can typically track extractables to low parts-per-billion levels. This matters when compounds lack established safe exposure limits and screening thresholds are applied. Repeatability is demonstrated through independent replicate preparations across different analysts and days. Relative standard deviations and control charts document precision. Biological assays require additional controls: cell passage limits, concurrent positive and negative controls, and acceptance criteria defined before testing starts. For sterility and bioburden methods, recovery efficiency is quantified per the applicable pharmacopoeial or ISO harmonized methods. Results outside acceptance criteria trigger deviation investigation, not silent retesting. Repeat determinations must be justified in the study report.

Standards and conformity assessment

Conformity assessment under MDR and IVDR combines harmonized standards, common specifications and notified body review. The route depends on device class. Manufacturers integrate test reports into the technical documentation alongside risk management files compliant with ISO 14971 and clinical evidence. Standards such as the ISO 10993 series, ISO 11135 and ISO 11137 for sterilization, and the IEC 60601 electrical safety family form the recognized methodological backbone. Sector-specific publications, from semiconductor reliability documents to specialized electrical equipment amendments, are cited where the technology demands them. Accredited laboratories issuing test data must operate under recognized quality systems. Reports should state method versions, deviations and uncertainty where relevant. Because review timelines are long, gap analysis against the regulations before submission reduces the risk of additional testing rounds and delayed certificates.