The lot history records have been reviewed with special attention to the manufacturing and inspection of this product and the product was found to have met all specifications prior to shipment.As part of all complaint investigations, an attempt was made to evaluate the subject device as well as the device usage.In this case, no sample was returned.On the basis of the evaluation of the images provided, the alleged delamination of the stent graft covering could not be confirmed since the covering was not visible under x-ray.The stent strut pattern did not appear inhomogeneous and no deficiency could be identified.Potential contributing factors to the reported event have been considered.As the reported event was found to be an isolated incident, no similar investigations of previous complaints could have been reviewed.The reported event may be related to a difficult vessel anatomy or improper balloon dilation.In this case, reportedly the lesion was difficult to pre-dilate.On the information available, the reported event could not be reproduced and a definite root cause could not be determined.The ifu states: "pre-dilate the stented restenotic lumen with a balloon diameter no larger than the previously placed bare metal stent (.).Do not use the device in patients where full expansion of an appropriately sized angioplasty balloon could not be achieved during pre-dilation (.).Post-dilation of the stent graft must be performed with a pta balloon catheter no larger than the previously placed bare metal stent.The stent graft implant cannot be expanded with an angioplasty balloon beyond its stated diameter." also the ifu states: "examine the packaging and endovascular system to determine if there is any damage, defects or if the sterile barrier is compromised.Do not use the device if any of these conditions are observed.".
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