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This remediation mdr was generated under protocol b10009704, as a result of warning letter cms# 617147.A device history record (dhr) review was conducted which indicated all inspections were completed and no issues were noted during manufacture.The device was received in good condition.During initial testing, dut (device-under-test) cycled when child setting was selected.When selector switch was moved off of this position toward adult setting, it was noted that there was a constant flow of gas present: the reported issue was confirmed.Also, leak was noted at the nrv (non-return valve) filter and filter assembly, which was no longer in use.The root cause of the reported issue was deemed to be design-related.Action(s) taken to mitigate the reported issue(s): replaced nrv, variable restrictor, and piping; performed functional check and device cycled at all tidal volume settings.
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