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Other, other text: this mdr was generated under protocol (b)(4), as a result of warning letter cms# (b)(4).A product sample was received for evaluation.Visual and functional testing were performed.The seals were intact and no physical damage on the device.The technician completed a visual inspection, battery life test, flow rate, c02 testing, and exchanging parts.The reported complaint was not duplicated after powered on the returned 9004051 monitor and the monitor was able to turn on.The battery life test was performed and passed.Internal inspect the main battery pack and did not find any signs of visual defects.The battery was measure at 2.86volt(spec: 3volt).However, during testing an occlusion displayed on the screen along with change filter error message.When these two errors appear the carbon dioxide (c02) function will not function.Technician went into the menu, selected capnograph, and changed the filter change setting to yes.The changed filter error message and occlusion error message was resolved after changed the setting to yes; performed co2 simulation tests and the monitor reads properly.Flow rate read at 178 millimeter ml/min (spec: 150 +/-20 ml/min).C02 test and passed.The change filter error message indicated the monitor have been occluded for 15 minutes or more and the moisture trap should be replaced; after replaced the moisture trap, the change filter setting should be changed to yes to clear the occlusion and change filer error message.However, due to 5 years of usage the main battery will need to be replace as a preventive maintenance.The restrictor will be replaced to adjust the flow rate to specification.The changed filter error was reset.The root cause of the reported issue could not be confirmed as the reported issue could not be replicated at the time of the device evaluation.Due to 5 years of usage the main battery will need to be replace as a preventive maintenance.The restrictor will be replace to adjust the flow rate to specification.The change filter error was reset.
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