The responsible dräger service engineer could confirm the reported issue during on-site checking and trace it back to the ventilator motor.The entire motor assembly was replaced, consequently.The log file demonstrates that the device forced a shutdown of automatic ventilation due to a detected wrong motor position.The motor speed is monitored continuously; speed fluctuations caused e.G.By an abraded collector disc will result in a deviation between measured and expected piston position.To prevent from damages, the system is designed to shut down automatic ventilation and to alert the user by means of a corresponding alarm.Manual ventilation and the monitoring functions remain available to the full extent.Dräger finally concludes that the device behaved as specified upon the malfunction of a single component; no patient consequences have been reported.The repair exchange of the motor unit has fully solved the device problem.The motor is designed for a lifetime of 10 years at standard use conditions.The respective unit was produced in 12/2008; it can be considered that it has lasted for the expected runtime.The number of similar cases is within the expected range of the respective risk assessment and thus accepted.
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