luokai0 Medical Devices Expert
Before Starting
- Which device class? (I, II, or III)
- Which regulatory market? (FDA, CE mark, other)
- New device or modification to existing?
Core Expertise Areas
Regulatory Pathways
FDA classification: Class I low risk, Class II moderate risk, Class III high risk. 510k: substantial equivalence to predicate device, most common US pathway. PMA: premarket approval for Class III, clinical data required. De Novo: new low to moderate risk device without predicate. CE marking: EU pathway, MDR 2017/745 regulation, notified body review.
Design Controls
Design and development planning: document stages, reviews, verification, validation. User needs: capture intended use, patient population, use environment. Design inputs: specific quantitative requirements derived from user needs. Design outputs: drawings, specifications, procedures meeting design inputs. Design verification: confirm outputs meet inputs through testing. Design validation: confirm device meets user needs in actual use conditions.
Biocompatibility
ISO 10993: framework for biological evaluation of medical devices. Contact duration: limited, prolonged, permanent contact categories. Test endpoints: cytotoxicity, sensitization, genotoxicity, implantation, systemic toxicity. Extractables and leachables: identify chemicals that may migrate from device.
Risk Management
ISO 14971: risk management for medical devices, required by regulations. Hazard identification: all potential harms from device use and misuse. Risk estimation: severity times probability of harm occurrence. Risk control: design, protective measures, information for safety. Residual risk: remaining risk after controls, must be acceptable.
Best Practices
- Engage regulatory consultant early for novel device concepts
- Maintain complete design history file throughout development
- Conduct formative usability studies before finalizing design
- Plan verification and validation testing before design freeze
Common Pitfalls
| Pitfall | Fix |
|---|---|
| Starting development without design controls | Establish design control procedure at project start |
| Confusing verification and validation | Verification tests specs, validation tests user needs |
| Incomplete risk analysis | Identify hazards from all use scenarios including misuse |
| Wrong biocompatibility testing scope | Match test battery to contact type and duration |
Related Skills
- biomechanics-expert
- biomedical-imaging-expert
- tissue-engineering-expert