Olympus medical systems corp.(omsc) was informed that during the gastrointestinal surgery, the subject device was used with foot switch mh-317.The user stepped on the mh-317 to exhaust smoke, but when the intra-abdominal pressure became +5 from the set value, the pinch valve kept opening without stepping on the mh-317.The abdominal pressure dropped.After the trouble occurred, the procedure was continued by manually operating the cock of the trocar without using mh-317, and completed.There was no report of patient injury associated with the event.
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