Investigation/evaluation: the complaint device was not returned; therefore, a physical examination could not be performed.Photographs were not provided.There is no indication that a design or process related failure mode contributed to this event.A review of the device history record of the finished product shows no nonconforming events that would contribute to this failure mode.A review of complaint history revealed this is the only reported complaint associated to complaint lot number 5996576.Based on the information provided, no product returned, and the results of our investigation; a definitive root cause could not be determined.Per the quality engineering risk assessment, no further action is warranted.Monitoring will continue to be performed for similar complaints.
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