Unravelling the DHF, Technical File and Design Dossier

Design History File (DHF), Technical File and Design Dossier are important regulatory documents for a medical device. Design Control and Design History File are regulatory documents for medical devices in the FDA, while the Technical File and Design Dossier serve the same purpose for the EU's regulatory body, the MDD.

The Design History File

The history of the Design History File is an interesting one. It evolved out of the FDA's realization, over time and experience; that the major part of a device's problems was happening during the design stage and change phases, regardless of whether it was a new product or a changed one. This led to the birth of the concept of Design Control, aimed at tracking, monitoring and correcting the design elements at every stage from start to finish.

Outstanding characteristics of the Design History File

What should the Design History File contain?

The DHF should contain the following:

Now, the Technical File and Design Dossier

In short and simple terms, one can understand the Technical File and the Design Dossier as the EU's version of the Design Control and the DHF. In other words, what Design Control and Design History File are for the FDA; the Technical File and Medical Device (MDD) are for the Medical Device Directive.

What should the TF and DD contain?

These files should have all the basic sections needed to support the requirements of the Medical Device Directive (MDD), Essential Requirements (for that product), and the company's "Declaration of Conformity" for that product:

General Information/Product Description/EC Authorized Representative
Classification Determination
Essential Requirements
Risk Analysis
Labeling
Product Specifications
Design Control
Clinical Evaluation
System Test Reports
Functional Bench Testing
Lab Testing
Sterilization validation (or AAMI TIR 28 Analysis)
Packaging Qualifications
Manufacturing
Sterilization
Conclusion
Declaration of Conformity
Appendix

Differences between the Technical File and Design Dossier

At a broad level, in general terms, while the Technical File is for MDD Class I and Class II a or II b; the Design Dossier is for MDD Class III devices

While Technical Files are retained in the premises of the manufacturer or the Authorized Representative for review of the Competent Authorities or/and Notified Body; Design Dossiers need to be submitted to the Notified Body for review before the product gets its CE-marking.