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This report is being supplemented to provide additional information based on the legal manufacturer's final investigation and device evaluation.The broken needle was returned to olympus in a jar and visual inspection of the device found the insertion sheath with a slight bend at the handle boot area.The stopper was missing, possibly removed by user.However, the handle section was functional.The needle slider could extend and retract the needle without issue.The stylet was also present and could be removed or reinserted into the device without restriction.The insertion portion was smooth, and the distal coil was intact.Furthermore, the needle tube and its needle fragment were inspected under a microscope.Olympus observed that the broken needle tube had jagged edges, bend, and measured about 24mm in length.The distal tip of the needle fragment was bent and also measured about 10mm long.A review of the device history record found no deviations that could have caused or contributed to the reported issue.The exact cause of the problem could not be conclusively identified.Based on the results of the investigation, it is likely the needle tube was broken by the following mechanism: 1.The needle tube buckled significantly due to bending force.It might have occurred due to the movement of the patient during the procedure.2.A load was applied to the bent needle tube in a direction to back to straight by pulling the needle slider.This caused the needle tube to bend severely.In addition, regarding buckling near the hard part, it is likely to have been caused by the following factors: - when removing from the tray, a bending load was applied to the needle tube.- during the pre-use inspection, a bending load was applied to the needle tube.- when inserting into the endoscope, a bending load was applied to the needle tube.The instructions for use have the following statement which can prevent the event: "do not force the instrument if resistance to insertion is encountered.Reduce the angulation of the endoscope until the instrument passes smoothly.Attempting to force the instrument could cause patient injury, such as perforation, bleeding, or mucous membrane damage.It could also damage the endoscope and/or the instrument.".
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