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.There is no indication for a manufacturing-related failure.On the basis of the evaluation of the returned device the reported event could not be reproduced.No malfunction of the device was identified.Potential contributing factors to the reported event have been considered.Previous investigations of similar complaints have been reviewed.The use of an inappropriately sized introducer sheath may be a contributing factor to the reported event.In this case, a 7 f introducer sheath was used whereas the recommended minimum introducer sheath size for this device is 9 f.The reported event may be associated with a difficult vessel anatomy which can lead to increased friction during the attempt to deploy the stent graft.Insufficient flushing of the device may be another contributing factor.In this case, it is unknown whether the anatomy was tortuous or calcified and if the system was flushed.On the basis of the information available, a definite root cause for the reported event could not be determined.The ifu indicates that the device must be flushed with sterile saline and: "the use of an appropriately sized introducer sheath is recommended." furthermore, the ifu states: "the safety and effectiveness of the device when placed across a tight bend (.) has not been evaluated.Prior to stent graft deployment, ensure that the proximal (inflow) stent graft end is positioned in a straight section of the lumen to reduce the risk of higher deployment forces and possible endovascular system failure" and "do not kink the delivery catheter or use excessive force during delivery to the target lesion." also the ifu states: "if unusual resistance or high deployment force is encountered during stent graft deployment, abort the procedure, remove the delivery system and use an alternative device.".
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