(b)(4).The device was not returned for analysis.The investigation was unable to determine a conclusive cause for the reported difficulties; however the treatment appears to be related to the circumstances of the procedure.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 identified no other incidents from this lot.Based on the information reviewed, there is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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