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 deployment failure could be confirmed.The stent graft was found to be loaded in the system.The outer sheath was found to be elongated indicating that increased friction must have affected on the delivery system during the attempt to deploy the stent graft.Potential contributing factors to the reported event have been considered.Previous investigations of similar complaints have been reviewed.This kind of event may be related to a difficult vessel anatomy or a challenging stent placement site.Reportedly, the tracking path was tortuous; the target anatomy was neither tortuous nor calcified.Insufficient flushing of the device may be another contributing factor to this type of event.On the basis of the information available and the evaluation of the sample returned, a definite root cause for the reported event could not be determined.The ifu indicates that the device must be flushed with sterile saline.Also 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." furthermore, 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." the reported application represents an off-label use of the device.The device is indicated for use in the venous outflow of hemodialysis patients dialyzing by either an arteriovenous (av) fistula or av graft.The safety and effectiveness of the device when placed across an aneurysm or a pseudoaneurysm has not been evaluated.
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