This supplemental report is being submitted to provide additional information.Olympus medical systems corp.(omsc) could not investigate the subject device, because the subject device was not returned to omsc.Device history record review indicates that the product was manufactured and tested in accordance with all applicable procedures and met all final product release criteria.Since the subject device was not returned to omsc, the exact cause was unknown.Omsc surmised that the reported phenomenon occurred due to the following causes.- the lamp socket of the subject device was broken due to dropping or hitting the subject device against something hard.- as about 13 years has passed since the manufacture date of the device, the lamp socket of the subject device was broken due to repeated usage over a long period of time.
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