The subject device was returned to omsc for investigation.Omsc checked the subject device and found that the reported phenomenon could not be confirmed and there was no perforation on the subject device.Omsc reviewed the device history record (dhr) of the subject device and confirmed no irregularity.The exact cause of the reported phenomenon could not be conclusively determined.However, based upon the investigation, there was the possibility that the user observed the part where air bubbles were gathered in the insertion tube, consequently the user mistakenly recognized that it was "missing of the ultrasonic propagation fluid medium", because the user stated the ¿missing¿, not stated the ¿leakage¿.
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