(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.Date of event - estimate.Evaluation summary: visual inspection was performed on the returned device.The reported break was confirmed.The investigation was unable to determine a conclusive cause for the reported difficulty.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 identified no other incidents from this lot.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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