The device was not returned for analysis.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 similar incidents from this lot.As there was no damage noted to the device during the inspection prior to use, it is possible that during advancement interactions with the guiding catheter resulted in the reported difficult to advance and resulted in compromising the device such that during deployment the ratchet was unable to properly engage the stent; thus resulting in the reported activation/deployment failure; however this cannot be confirmed.The investigation was unable to determine a conclusive cause for the reported difficulties.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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