(b)(4).Device evaluated by manufacturer: the device was returned for analysis.The advancer, handshake connections, sheath, coil and burr were microscopically and visually examined.The advancer unit and the burr units were received attached together as a single unit.The advancer knob was received tightened in a backward position.There was 1cm of fibrous foreign material (fm) on the coil at the end of the coil where the burr is attached.Inspection of the device presented no kinks or other irregularities to the device.The guidewire used in the procedure was not returned for product analysis, so functional testing was completed with a test rotawire.The rotawire was able to be inserted into the burr and advanced through the device with no issues.Inspection of the remainder of the device presented no other damage or irregularities.The manufacturing batch record review confirmed that the device met all material, assembly and performance specifications.The root cause is not confirmed as there was no evidence of the alleged issue or any anomalies which could have contributed to the reported difficulty.(b)(4).
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