- Published
- Updated
An accessory fitting a connector does not establish clinically equivalent use with an investigational device. A cable, probe, consumable or adapter may change signal quality and operation. Test the compatibility claim against the actual combination and conditions used in the investigation.
Define the assessment
Link the accessory manufacturer, model, version and operating conditions to the device. Distinguish a connectivity test from evidence of adequate performance for intended use. Suitability demonstrated for a component in a different setting is not an automatic conclusion covering every condition of the present investigation.
Worked example
In a hypothetical monitoring study, a different cable is proposed during a stock shortage. The electrical connection works, but signal loss increases during movement. The team reviews affected recordings, movement conditions and implications for endpoint assessment rather than closing the issue with purchasing approval. Participant use awaits the authorised assessment and decision.
Practical checks
- Compare the identifiers of permitted investigation accessories against the stock actually held at sites.
- Ensure compatibility testing represents relevant use conditions and important failure situations.
- Update instructions, training and data-impact assessment together when an accessory changes.
Decision and limitations
Acceptance should show under which conditions the combination performs its intended task. If evidence comes only from a bench test, avoid extending it into unsupported clinical claims. Make unresolved compatibility uncertainty visible in investigation oversight and risk assessment rather than burying it in procurement correspondence.
Frequently asked questions
- Does a successful connection demonstrate compatibility?
- It establishes connection only. Signal, safety, usability and performance consequences still require assessment.
- Can a supplier silently change an accessory?
- A change affecting the controlled investigated combination should undergo the relevant assessment and authorised decision.