Investigation - evaluation: a review of the complaint history, drawings, device history record, documentation, instructions for use (ifu), manufacturing instructions, specifications, and quality control of the returned device was conducted during the investigation.The device was not returned for evaluation, thus, a device failure analysis could not be completed.A lot search for the distribution center indicated that all devices from lot 8094141 were distributed to customers; therefore, no representative device from the same lot could be investigated.Previously completed and similar complaints were reviewed, however, it was unable to be determined with certainty what could have led to the reported failure.The complaint device was not returned; therefore no physical examination could be performed.However, a document-based investigation was performed.There is no evidence to suggest the finished product was not made to specifications.Review of the device history record of the finished product shows no nonconforming events that could contribute to this failure mode.A complaint history search revealed that there were no other reported complaints for this lot number.Based on the information provided and the results of our investigation, a definitive root cause cannot be determined at this time, however appropriate measures have been initiated to address this failure mode.Monitoring will continue to be performed for similar complaints.
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