Olympus medical systems corp.(omsc) could not investigate the device, because the 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.The exact cause has been unknown; however, the following are supposed to be the cause of the cracks of the lid of the device.Due to the opening and closing operation of the lid of the device, a stress was repeatedly applied to the lid.The lid was cracked because of some strong impact.The lid was cracked because of effects of chemical substances.
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