The investigation was performed based on a screenshot of the error code entries as the device log could not be downloaded by the biomed.An evaluation of the log extract shows that during the case in question the supervisor function of the software detected a stalled motor.In this case a shutdown of automatic ventilation is forced.This is a safety measure to prevent from mechanical damages to the ventilator unit.The user is alerted to the shutdown of automatic ventilation by a corresponding alarm; manual ventilation remains possible and, the other device functions like gas dosage and monitoring remain unaffected.According to the biomed the problem was solved by removing and reseating of the motor.Therefore it can be assumed that high friction at the spindle or the piston/diaphragm has caused the reported symptom.After the repair action the device was returned to use without further problems reported.Dräger finally concludes that the device behaved as specified upon the detected malfunction; no patient consequences have been reported.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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