(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.The unique device identifier (udi) is unknown because the part and lot numbers were not provided.The device was not returned for analysis.The lot history record (lhr) could not be reviewed and a similar incident query could not be performed because the product was not returned for evaluation and the part and lot numbers were not reported.The investigation was unable to determine a conclusive cause for the reported difficulties.There is no indication of a product quality issue with respect to the design, manufacture or labeling of the device.
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