Device evaluation: one smiths medical portex epidural continuous tray was returned for analysis.Visual inspection was performed, and it was noted that rotating collar was missing on returned filter.Each flat filter contained retention edge which is designed to hold rotating collar connected with filter.It was also noted that retention edge on returned sample was found to be damaged and therefore it could not hold rotating collar in place.The returned sample was also tested by syringe filled with water and could be confirmed that no leakage was observed.Based on the investigation results, it was believed that the reported leakage was due to rotating collar detachment which was caused by overtightening by user which conflicted with instructions for use.Based on the evidence, the complaint was confirmed, and the problem source of the reported event was noted to be user interface.
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