(b)(4).Evaluation summary: visual and functional inspection was performed on the returned device.The difficulties were not confirmed.The investigation was unable to determine a conclusive cause for the reported difficulties.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a review of the complaint history of the reported lot revealed no other incidents.Based on the information reviewed, there is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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