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It was reported that the procedure was to treat a 90% stenosed de novo lesion in the posterior descending artery (pda) with heavy calcification and moderate tortuosity.After a cutting balloon was used for pre-dilatation, the 2.25x33mm xience skypoint stent delivery system (sds) was attempted to be advanced to the target lesion; however, the sds became stuck with the guidewire during advancement.Therefore the sds was attempted to be removed from the anatomy, during removal the sds also met with resistance and had to be removed with the guidewire as a single unit when the stent dislodged from the delivery system.An unsuccessful attempt to remove the dislodged stent was made with snare device.An additional stent was advanced to embed the dislodged stent into the target lesion to complete the procedure.There was no adverse patient sequela.No additional information was provided.
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The device was returned for analysis.The reported stent dislodgement was confirmed.The reported difficulty to advance and difficulty to remove was confirmed through observation.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.The investigation was unable to determine a conclusive cause for the reported difficulties; however, factors that could contribute to a difficult to advance include, but are not limited to, inner diameter of guide wire lumen, outer diameter of the guide wire, patient¿s anatomical morphology, damage to the guide wire, damage to the catheter, and/or accumulation of procedural contaminants in the guide wire lumen.Factors that could contribute to a dislodged stent include, but are not limited to, improper or inadequate crimping at the time of manufacture, forced sheath removal, handling of the stent during preparation, interaction with challenging anatomy, and/or interaction with accessory devices.Factors that could contribute to a difficult to remove include, but are not limited to, damage to the balloon, stent wall apposition, interaction with challenging anatomy, and/or interaction with accessory devices.The product risk assessment identifies this as a foreseeable event; as such, design and manufacturing controls and mitigations have been established for potential causes.In this case, it is possible that the stent delivery system (sds) interacted with the heavily calcified, moderately tortuous, and 90% stenosed lesion and/or guide wire during advancement, resulting in the reported difficult to advance.Further interaction with the challenging anatomy and/or guide wire during removal, as resistance was noted, possibly resulted in the reported difficult to remove and subsequent dislodged stent; however, this cannot be confirmed.The reported treatment appears to be related to operational context of the procedure.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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