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A device functioning normally in a laboratory does not establish that a reported problem never occurred. Conversely, a technical nonconformity does not prove that it caused every clinical event. Link clinical and technical assessments while preserving their separate conclusions.
Define the assessment
Record the returned unit’s condition, conditions during use and limitations of the investigation method. Failure to reproduce a problem and exclusion of the problem are different conclusions. Explain which questions belong to technical specialists, investigators and safety reviewers rather than forcing uncertainty into one definitive failure code.
Worked example
In a hypothetical procedure, a device produces intermittent signal loss but passes a bench test after return. The team examines cable movement, temperature and connection logs. It finds that the test did not represent those conditions. The participant event remains documented while technical assessment is reconsidered; a normal bench result is not reported as proof of no event.
Practical checks
- Link return, handling and examination history to the condition of the device during use.
- Explain how closely the technical test represents the suspected failure conditions.
- Record clinical causality and technical root-cause conclusions separately through authorised reviewers.
Decision and limitations
The report should distinguish confirmed findings, excluded explanations and unresolved questions. An unidentified root cause does not automatically end follow-up. Route recurring patterns and safety implications into appropriate oversight, without unsupported blame of participants or operators.
Frequently asked questions
- Does an unreproduced failure close the event?
- Not automatically. Consider investigation limitations, other records and participant impact together.
- Is technical root cause the same as clinical causality?
- No. The relationship between a technical finding and the clinical event needs a separate qualified assessment.