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This supplemental report is being submitted to provide additional information.Olympus europa se & co.Kg (oekg) made three requests to the user facility to return the subject device, but the user facility never contacted oekg.Therefore, olympus medical systems corp.(omsc) evaluated based on the content of the proposal and the attached photo.In the evaluation of omsc the following was confirmed, the both ends of the stent appeared breakage due to tensile force.There were no side flaps on both ends.Since the lot number of the subject device was unknown, the dhr for over the past year prior to the date of occurrence was inspected.No abnormalities detected in the dhr of the following inspection items which relate to the reported phenomenon.Process inspection sheet, quality inspection sheet, nonconforming product report.Based on the condition of the subject device in the provided pictures, and the results of similar investigations, it is possible that the stent broke due to the following combination of complexed factors.Due to internal environment of the patient¿s body, such as chemical effects of digestive juices and mechanical effects of peristalsis, structural strength of the side flaps had deteriorated.The stent was forcefully pulled (near the side flaps with low structural strength) by using the forceps under the condition that the stent was difficult to pull out.The above device handling has warned in the instruction manual.However, the subject device could not be confirmed since it was not returned for investigation.Therefore, the exact cause could not be determined.
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