(b)(4).Investigation summary: a device history record review was completed by our quality engineer team for provided material number 306594 and lot number 9112667.The review did not reveal any detected abnormalities during the production process that could have contributed to this defect and all quality tests were found to be within specification.As a sample was unavailable for return, a thorough sample investigation could not be completed.Investigation conclusion: based on the investigation and with no sample analysis the symptom reported by the customer could not be confirmed.Root cause description: based on the investigation results, an exact cause for this incident could not be identified.Rationale: further action has not been determined necessary at this time.Complaints received for this device and reported condition will continue to be tracked and trended.Our quality team regularly reviews the collected data for identification of emerging trends.
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