Device evaluation results: the portex oxygen/aerosol nasal cannula was returned for investigation.The investigator checked all the lines for any signs of occlusion using air as well as 5x-20x microscopy.All of the interior flow pathways throughout the entire device looked to be proper in appearance, and no obstructions, or occlusions were identified.The customer reported product problem was not confirmed.The problem source of the reported product problem was unknown.A root cause was not established.
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