It was reported that the procedure was performed on (b)(6) 2020, to treat an 80% stenosed moderately calcified lesion in the left popliteal artery.Laser atherectomy and balloon angioplasty were performed to prepare the lesion.The 5.5 x 40 mm supera stent delivery system was advanced.Some resistance was noted during advancement, due to the vessel anatomy; however, the device was able to be placed at the target lesion.Deployment was initiated, and it was noted that the device seemed to be "stacking", although this was not seen on angiography.It was felt that the stent was deployed, so removal of the stent delivery system was initiated; however, resistance was felt and the stent was noted to be pulled back into the posterior tibial artery and elongated.The stent delivery system was removed, but it was noted that the nose cone and a portion of the delivery system remained in the patient anatomy, on the guide wire.A guide catheter was advanced via contralateral access and the separated segment was pushed into the guide catheter and removed.The patient was placed on dual anti-platelet therapy of aspirin and plavix.On (b)(6) 2020, one day post procedure, the patient presented at follow up visit, with leg pain from the mid calf to the achille's heel.Ultrasound was performed and noted occlusion, with no flow in the posterior tibial artery.On (b)(6) 2020, manual thrombectomy aspiration was performed and the patient was started on xarelto.No additional information was provided.
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Visual and functional analysis was performed on the returned device.The reported difficulty to advance, difficulty removing, and stent stacking were unable to be confirmed due to the condition of the returned unit and the stent was not returned.The tip detachment was confirmed.A review of the lot history record revealed no manufacturing nonconformities that would have contributed to this complaint.Additionally, a review of the complaint history of the reported lot revealed no other complaints.The investigation was unable to determine a cause for the reported difficulties and subsequent patient effects.The tip separation likely occurred as the partially deployed stent was being withdrawn into the introducer sheath causing the tip to separate due to the reduced diameter clearance.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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