Investigation completed 12/8/2017.Only the ventricular catheter and the distal catheter were returned for investigation; the valve was not returned.Both catheters were patent, no obstruction was noted.Inspection of the catheters under magnification revealed no anomaly.The device history records of the osv ii ref 909712, lot 197979 were reviewed and did not reveal any anomaly.The complaint cannot be verified with the returned products, the most likely cause of the reported underdrainage after 2 weeks of implantation is a valve obstruction.
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