A review of the complaint history, device history record, drawings, trends, and quality control of the returned device was conducted during the investigation.The complaint devices were not returned; therefore no physical examination could be performed.However, a document-based investigation was performed.There is no evidence to suggest the finished products were 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 could not be determined.Numerous design verification and validation activities have been performed to ensure that this device meets design requirements.Per the [quality engineering] risk assessment, no further action is required.Monitoring will continue to be performed for similar complaints.
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