The affected device was tested by dräger service and the logbook was saved for further analysis.The reported event could be confirmed on the basis of the logbook.On august 04, 2022 at 14:25 system time, data recording stopped unexpectedly during ventilation in spn-cpap/vs mode.There are no further entries in the logbook and on august 5th.During the on-site analysis, the device could not be started initially.In the device test, the circuit board pba m48.3 was identified as the cause of the malfunction.The device could be repaired by replacing the pba including the usd cards.In case of a complete loss of function of the ventilator the ventilation stops, and the safety valve opens automatically to the ambient allowing the patient for spontaneous breathing.The screen turns black and the secondary acoustic alarm system (piezo speaker) of the ventilation unit will be activated in order to alert the user to the situation.This alarm is energized from an independent power source and will be last for at least 2 minutes.The number of similar cases, related to the same root cause, is within the expected range of the respective risk assessment and thus accepted.
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