It was reported that the procedure was to treat a calcified, eccentric, 30 mm, 90% stenosed lesion in the right popliteal, artery.The vessel diameter was 6.5 mm and atherectomy was not used.The lesion was prepared with a 7x40 mm armada percutaneous transluminal angioplasty (pta) catheter at 18 atmospheres for 1 minute.The 6.5x60 mm supera self expanding stent (ses) was deployed without issue.At the end of the stent it was noted that the tip of the delivery system was stuck to the stent.Additionally a 7x40 mm armada 35 pta catheter became stuck when it was attempted to be removed.The armada was managed to be removed with mechanical manipulation by rotating and pushing the device.The stent became elongated and was pulled upwards, completely away from the target lesion due to the interaction with the delivery system and the armada.Additional stents had to be placed at the distal and proximal ends of the supera.There were no reported adverse patient sequela.There was no reported clinically significant delay in the procedure.No additional information was provided.
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The device was returned for analysis.The reported difficult to remove and the reported stent migration were unable to be replicated in a testing environment as they were based on operational circumstances.The reported stretched stent was unable to be confirmed as the stent was not returned.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.The investigation determined the reported difficulties appear to be related to circumstances of the procedure as it is likely that interaction with the deployed stent as the tip/nose cone was being retracted resulted in the reported difficult to remove.Manipulation of the device resulted in the reported stretched stent and the reported stent migration.Manipulation of the device and/or interaction with other devices likely resulted in the noted device damages (stretched tip jacket, stretched inner member).The treatment appears to be related to the operational context of the procedure as additional stents had to be placed at the distal and proximal ends of the supera.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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