(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.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 incidents.The investigation was unable to determine a conclusive cause for the reported difficulties.It may be possible that the distal sheath was restricted or entrapped within the anatomy causing the stent to jump during deployment due to built-up tension within the shaft lumens of the delivery system resulting in a spring like release of the stent; however, this could not be confirmed.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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It was reported that the procedure was performed to treat a moderately tortuous lesion in the internal carotid artery.An 8/30 acculink ii self expanding stent delivery system was advanced to the lesion with no resistance; however, the stent was difficult to visualize and appeared to jump on deployment.The stent was ultimately deployed partially inside the target lesion, leaving part of the lesion uncovered.A second unspecified acculink stent was deployed to treat the remainder of the lesion.There was no reported adverse patient sequela and no clinically significant delay in the procedure.No additional information was provided.
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