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(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.The device was not returned for analysis.A review of the lot history record revealed no non-conformances that would have contributed to the reported event.A query of the complaint handling database revealed no other incidents reported from this lot.The investigation was unable to determine a cause for the reported difficulty.There is no indication of a product quality issue with respect to manufacture, design or labeling; therefore, no corrective action is required.
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