It was reported that the procedure was performed to treat a lesion in the mildly calcified, mildly tortuous, 70% stenosed popliteal artery.A 5.5x40mm supera self-expanding stent was thought to be fully deployed, but the stent was partially deployed.The tip became stuck with the stent, and the stent could not be released.After manipulation, the stent jumped, then released and was implanted.There were no adverse patient effects and no clinically significant delay in the procedure.No additional information was provided.
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The device was not returned for analysis.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 similar incidents.The investigation determined that the reported difficulties were due to case circumstances.It is likely that the distal sheath of the delivery system was entrapped or bent in the anatomy such that the ratchet was unable to properly engage the stent resulting in partial deployment.The difficulty removing and malposition of the stent was the result of pulling back the delivery system with the stent partially deployed.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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