This supplemental report is being submitted to provide additional information.The subject device has not been returned to olympus medical systems corp.(omsc) for evaluation.Omsc reviewed the manufacturing history (dhr) of the subject device and confirmed no irregularity.The exact cause of the stent been left in the instrument channel could not be conclusively determined.However, based on the past similar complaints, the possible cause was due to user mishandling or abnormality of the endo-therapy accessory.For the dirt in the light guide lens, omsc reviewed previous complaints and found that there was the same complaint with the same device.(mfr.Report #8010047-2020-07939) the evaluation confirmed that there was also a air leakage in the device at that time.The exact cause could not be conclusively determined.However, there is a possibility that the dirt could have been attributed to fluid ingress through the leaky instrument channel or the deteriorated adhesive around the light guide lens.
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