This is a supplemental report for mfr report #8010047-2020-01892.The lid of the subject oer-5 was returned to olympus medical systems corp.(omsc) for evaluation.Omsc confirmed that the subject lid had a crack.The cracks were near the screw fastening part and the molding weld line.As a result of fracture surface analysis of the crack near the screw fastening part, this crack was fatigue fracture.During the following evaluation by omsc, the crack was not duplicated.- omsc repeatedly opened and closed the subject lid.- omsc applied heat to the subject lid.Omsc reviewed the manufacturing history of the subject device and confirmed no irregularity.The exact cause has been unknown; however, the following are supposed to be the cause of the cracks of the subject lid.- due to the strong opening and closing operation of the lid of the subject device, a strong stress was repeatedly applied to the subject lid.The instruction manual of the subject device states the corresponding method in case of an abnormality.
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