The returned patient cassette including the allegedly stuck one way valves has been tested and there were no indications of stuck valves.The patient cassette functions as intended.According to the test log, a successful system check out (sco) was performed just prior to the event.There is no recorded sco after the event.Both the trend log and the internal log show that there were difficulties to ventilate the patient.There were alarms indicating a leakage.Based on the lack of technical alarms related to pressure and the lack of negative pressures recorded in the trend log, it is not likely that a stuck inspiratory and/or inspiratory valve contributed to the reported event.Based of the above information, we are unable to determine the root-cause of the reported problem.(b)(4).
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