No lot number was provided; therefore, device history record review could not be performed.A product sample was received for evaluation.Visual testing was performed.Visual inspection found the rotating collar (luer lock) is missing on returned filter.Each flat filter contains retention edge which is designed to hold rotating collar connected with filter.Retention edge on returned sample was found to be damaged and therefore it could not hold rotating collar in place.The root cause of the reported issue was found to be user overtightening the connection.No information has been provided to date this remediation mdr was generated under protocol (b)(4), as a result of warning letter cms# (b)(4).
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