This is a supplemental report to provide additional information.The sterile package of the electrosurgical snare, subject device and packaging materials were not returned for investigation.Only one blue thread that might have been inside of the package was returned.The length of the thread was about 20 cm.The thread was not made out of silk or cotton, and it was possibly made out of twisted synthetic fibers.The manufacturing record was reviewed and found no irregularities.Production process was confirmed.However, the returned thread and non-woven fabric to cause the thread were not used during production process.Occurrence of the similar reported event in the past was investigated.No similar reports have been received over the past year.The returned thread was not used for production process.No abnormalities were detected during production process.Therefore, the exact cause of the reported event could not be identified.It can be inferred that the reported event might have occurred at the facility when the device was taken out from the package, the thread adhered due to static electricity.The instruction manual of the subject device has described pre-use inspection and what to do if there are any irregularities.
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