(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.Date of event estimated.The unique device identifier (udi) is unknown because the part lot numbers were not provided.It is indicated that the device is not returning for evaluation; therefore, a failure analysis of the complaint device could not be completed.The investigation concluded that a cause for the reported tip detachment and deployment lock issue could not be determined.The lot history record (lhr) 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.Based on the information reviewed, there is no indication the issue was caused by or related to the design, manufacture or labeling of the device.
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