Technical file summary TR-002: evidence depth across two routes

1. Key takeaways

Technical reference file TR-002, Summary of Technical Documentation for Demonstrating Compliance with the Safety and Performance Essential Principles for Medical Devices, governs the structure of the summary, not the full technical file. Under the two evidence routes the summary carries different depth. On Route 1, CAB certification review, the conformity assessment body has already completed its assessment, so the summary functions as a presentation of conclusions to MDD. On Route 2, reference jurisdiction approval, MDD must itself judge whether the foreign approval covers the Hong Kong, China Essential Principles, so the summary has to carry fuller argumentation. Writing one version for both routes is one of the most frequent causes of requests for further information.

The distinction matters because it changes the drafting task, not merely the length. A conclusion-style summary reports what has been established elsewhere. An argument-style summary has to establish the bridge between a foreign approval and the local principles.

• Structure is fixed, depth is not. TR-002 prescribes the sequence of content; the amount of reasoning behind each item follows from the route.
• Route 1 presents conclusions, Route 2 argues equivalence. The same headings serve two different purposes.
• Indexability beats completeness. A short, tightly ordered summary outperforms a long, loosely ordered one, a practical estimate rather than a published rule.
• Route 2 must address local differences. Label language, warnings and intended population are the usual points where a foreign approval does not automatically map onto Hong Kong, China requirements.
• The summary and the checklist must interlock. Page references in the summary have to match the locations recorded in the Essential Principles checklist.

2. Legal basis

TR-002 sets the structure and content of the technical documentation summary. It operates alongside TR-001, Certification Review Principles for Medical Devices, which defines the principles the conformity assessment follows, and TR-004, which supplies the Essential Principles being addressed. GN-04 governs the certification review framework and the bodies that carry it out. GN-02 sets the dossier preparation requirements for Class II, III and IV general medical devices, within which the summary sits.

One detail of GN-04 deserves attention. Paragraph 6.6 deals with additional conditions attached to a certification review, which means the outcome of Route 1 can itself carry qualifications. Where those conditions exist, the summary has to reflect them rather than present an unqualified conclusion.

3. Expert insights

TR-002 and TR-001 are a matched pair. TR-001 defines the principles of the certification review; TR-002 defines the summary of the technical documentation that demonstrates conformity with the Essential Principles. On Route 1 the two documents together form the common language between the conformity assessment body and MDD. Reading only one of them produces a summary that follows the skeleton but misses what the skeleton is for.

The summary is not an abridged technical file. Its function is to let the reviewer locate evidence quickly, so indexability matters more than completeness. A 200-page summary with loose structure is reviewed less efficiently than a 30-page summary with clear entries, and the difference shows up as review time and as the number of questions raised. This is a practical estimate. The reasoning behind it is simple: the reviewer is not reading for pleasure but navigating to a specific clause.

On Route 2 the summary must answer the local difference question. The Essential Principles of Hong Kong, China and the technical requirements of a foreign jurisdiction may diverge, for example on label language, warning wording or intended population. If the summary does not explain how those differences are covered, the reviewer has no basis for judging the equivalence of the foreign approval. The summary then fails not because the product is deficient but because the argument is missing.

On the reference approval route the summary and the checklist must bite together. The evidence the TR-002 summary points to has to sit at the same location marked in the Essential Principles checklist, otherwise the reviewer cannot cross-verify. Two documents that describe the same file differently create work for the reviewer and doubt about the applicant.

Structure discipline signals competence. A summary that follows the TR-002 sequence exactly is easier to assess and conveys that the applicant knows the system. Re-ordering sections to match internal habits forces the reviewer to reconstruct the mapping, which is precisely the cost the summary exists to remove.

4. Practical recommendations

• Keep two templates, one per route. Maintain a conclusion-style template for Route 1 and an argument-style template for Route 2, and select on the basis of the eligibility assessment.
• Align the structure strictly to the TR-002 items. Do not re-order chapters, so that the reviewer can follow the file against the reference document.
• Add a local differences chapter on Route 2. Set out the Hong Kong, China specific labelling, language and warning requirements and explain how each is covered.
• Cross-check against the checklist before submission. Compare the summary page references with the locations cited in the Essential Principles checklist, entry by entry.
• Test the index, not the prose. Ask whether a reviewer can reach the evidence for any given principle in three steps, and treat failure as a drafting defect.

5. Verification checklist

• □ The applicable route has been confirmed and the matching summary template selected.
• □ The summary structure follows the TR-002 item order strictly.
• □ A Route 2 dossier contains a chapter on local differences.
• □ The references in the summary match those in the Essential Principles checklist.
• □ The current version of TR-002 has been confirmed.
• □ Indexability check completed: a reviewer can locate the evidence for any principle within three steps, a practical estimate.

Regulatory information verified as at 29 October 2026. The legislation, guidance and effective dates described in this article are limited to the content published by the official sources listed under legal basis on that date; where those sources are updated, the latest published version prevails.

How GRZAN can help. GRZAN provides medical device and IVD registration, quality system, authorised representative and local testing support for Hong Kong, China. Our team prepares MDACS-compliant dossiers, coordinates evidence of reference approvals and ISO 13485 certificates, and supports post-market vigilance obligations. Business enquiries: info@grzanglobal.com