(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.Udi#: in the absence of a reported part number, the udi cannot be calculated.The device was not returned for analysis.The lot history record for this product 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 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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