The actual device was not returned to the manufacturing facility for evaluation, however, the facility returned an unused sample for evaluation.Therefore the investigation results are based upon the user facility information, the unused sample and the evaluation of the retention samples from the reported product code/lot# combination.Visual inspection revealed no defects.Dimensional testing was conducted and confirmed the samples met manufacturer specification.Functional testing could not reproduce the reported failure.A review of the complaint records for the past two years was conducted with no relevant findings.There is no evidence that this event was related to a device defect or malfunction and the exact cause cannot be determined based on the available information from the user facility and investigation results.(b)(4).All currently available information has been placed on file by qa at the manufacturing facility for appropriate tracking, trending and follow-up.Actual device not returned.
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