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 incidents from this lot.It is possible that the distal sheath of the delivery system was entrapped or bent in the anatomy such that the ratchet was unable to properly/fully deploy the stent resulting in the reported difficult to advance and the reported activation/deployment failure; however this cannot be confirmed.The investigation determined a conclusive cause for the reported difficult to advance and the reported activation/deployment failure cannot be determined.Manipulation and/or interaction with the anatomy/other devices as the device was being removed from the patient likely resulted in compromising the device; thus, resulting in the reported tip material separation outside of the anatomy.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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