Visual and functional analysis was performed on the returned device.The reported deployment failure was confirmed.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 similar complaints.The investigation was unable to determine a definitive cause for the reported difficulties.It may be possible that the distal outer sheath was bent or entrapped in the anatomy causing resistance with the thumbwheel and preventing deployment; 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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