(b)(4): during processing of this complaint, attempts were made to obtain complete event, patient and device information.(b)(4).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 similar incidents from this lot.It should be noted that the xience sierra everolimus eluting coronary stent system instruction for use (ifu) states: when treating multiple lesions within the same vessel, stent the distal lesion prior to stenting the proximal lesion.Stenting in this order obviates the need to cross the proximal stent during placement of the distal stent, and reduces the chance of damaging or dislodging the proximal stent.It appears the ifu deviation may have contributed to the reported event.The investigation determined the reported difficulties appear to be related to circumstances of the procedure as it is likely the device interacted with the previously implanted stent while crossing distally causing the reported physical resistance and subsequent stent dislodgement with the patient effect of foreign body in patient.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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It was reported that the procedure was performed to treat a lesion in the chronic total occlusion in the right coronary artery.Two xience sierra stents were successfully implanted in the mid to proximal right coronary artery (rca).The 2.25 x 15 mm xience sierra was advance into the patient anatomy, to treat a diseased portion of the vessel that was distal to the two implanted stents.Resistance was noted advancing through the previously implanted stents; however, the device was able to cross to the target lesion.Once at the target lesion, it was noted that the stent was not on the delivery system.The stent was not seen in the patient anatomy; however, it was felt that the stent was on the delivery system when it was inserted into the patient anatomy.The stent could not be located outside the patient anatomy.A new xience sierra stent was then used to treat the remaining lesion.No additional information was provided.
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