The subject product was returned to omsc for investigation.The investigation confirmed that the coating on the cutting wire was torn and the cutting wire was broken.The broken section was melted and burned.The length of the coating was approximately 10.0 mm shorter than the specification.There were no other abnormalities related to the breakage in the subject device.As the checking of the manufacturing record of the same lot, nothing abnormal was detected.The length of the cutting wire.The length of coating on the cutting wire.Outer appearance of coating on the cutting wire.Movement of the cutting wire.This type of damage is most likely related to the operator's technique.As the results of the investigation, omsc assumes that the damage of the coating and cutting wire occurred due to contacting with the metal part of the forceps elevator of the endoscope.The exposed cutting wire from the damaged coating contacted or came close to the metal part of the forceps elevator while activating the output, which caused spark and a part of the cutting wire became extremely hot, resulting in breakage.The coating broke off and came off from the cutting wire because of the user handling after the cutting wire was broken.
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