Evaluation of the returned device found missing parts on the gas inlet, the fio2 and balance were out of specification and no sound, coming from the unit, with any sudden pressure drop.The no sound was a result of a defective reed.Review of dhr 3500cp-g mixer sn (b)(4) found no indication that there were any relevant discrepancies during manufacture of the device and no non-conformance that could have caused or contributed to the reported issue.At this time there is no evidence that a manufacturing non-conformity contributed to the reported complaint, and the instructions for use were reviewed and determined to provide adequate instructions and warnings for the safe and effective use of the device.Therefore, no corrective or preventative actions are necessary.All complaints are trended and reviewed by management on a monthly basis.As part of this monthly review, any excursion above the control limits for this failure mode will be assessed, documented and acted upon as warranted.Manufacturer reference file # (b)(4).
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