DHF

A Design History File (DHF) is a compilation of records that describes the design history of a finished medical device. Required by FDA 21 CFR Part 820 (Quality System Regulation), the DHF documents how design controls were applied throughout the device development process.

What the DHF must contain:
- Design and development planning documents
- Design input requirements
- Design output specifications
- Design review records
- Design verification results
- Design validation results
- Design transfer records
- Design change documentation

Key elements documented:
1. Design Input - User needs, intended use, performance requirements
2. Design Output - Specifications, drawings, software code
3. Design Reviews - Meeting minutes, decisions, action items
4. Verification - Testing that outputs meet inputs
5. Validation - Testing that device meets user needs
6. Risk Management - Hazard analysis, FMEA, risk controls
7. Traceability - Requirements to testing to final device

DHF vs DMR vs DHR:
- DHF - Design History File (development records)
- DMR - Device Master Record (manufacturing specifications)
- DHR - Device History Record (production batch records)

Regulatory importance:
- Required for FDA QSR compliance
- Demonstrates design control compliance during audits
- Essential evidence for 510(k) and PMA submissions
- Similar requirements in EU MDR Technical Documentation

The DHF should be maintained throughout the product lifecycle and updated for design changes.