This report is being supplemented to provide additional information based on the legal manufacturer's final investigation.A review of the device history record found no deviations that could have caused or contributed to the reported issue.It has been less than 1 year since the subject device was manufactured.Based on the results of the investigation, the root cause of the reported event could not be determined.However, the distal cover likely fell off the scope due to the following: 1.Antifogging agent adhered to the cover, which led to breakage due to chemical attack.As a result, the cover came to be easily detached from the endoscope.2.The cover was insufficiently attached to the endoscope, which caused the cover to easily be detached from the endoscope.3.The cover was pushed at an angle when attached to the endoscope, which led to breakage of the cover.As a result, the cover came to be easily detached from the endoscope.The event can be detected/prevented by following the instructions for use (ifu) which state: ¿chapter 3 preparation and inspection, section 3.5 attaching accessories to the endoscope as below: [attaching the single use distal cover] 1 confirm that the instrument channel outlet of the distal end is opened.2 if the instrument channel outlet is not opened, move the elevator control lever in the opposite direction of the ¿u¿ direction until the forceps elevator stops to make the instrument channel outlet opened.3 gently hold the distal part of the bending section and the single use distal cover.Align the opening side of the single use distal cover with the lenses side of the distal end.4 put your finger onto the center on the top of the single use distal cover and push the top of the single use distal cover straight onto the distal end of the endoscope until the hook of the distal ring is completely visible within the opening of the single use distal cover.5 hold the distal part of the bending section.Pull the single use distal cover gently to confirm that the single use distal cover on the distal end of the endoscope does not slip and come off.6 twist the single use distal cover gently in both directions and confirm that the single use distal cover on the distal end of the endoscope does not slip and come off.7 confirm that the single use distal cover is free of cracks or deformation.8 confirm that there is no adhesion of foreign materials between the distal end of the endoscope and the single use distal cover.¿ olympus will continue to monitor field performance for this device.
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