Visual inspections were performed on the returned device.The reported premature deployment was confirmed as the stent was returned partially exposed but not flowered.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a review of the complaint history identified no other complaints reported from this lot.The investigation determined that the reported premature deployment was likely due to inadvertent mishandling.It is likely that during removal of the stylet, the tip was inadvertently pulled such that the stent slightly pulled out from the distal sheath.It may also be possible that the stylet was not removed per the instructions for use.The delivery system preparation section instructs to gently twist and pull to remove the tip mandrel.If the tip mandrel is not easily removed, do not use the device.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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