A draeger fse could confirm the issue upon on-site evaluation of the electronic log file and has replaced the ventilator motor.The workstation passed all consecutive tests and is now back in use again.The replaced motor was handed over to the manufacturer for evaluation.Evaluation of the motor in the manufacturer's lab revealed that there were several positions where the motor did not provide mechanic power due to a mechanically abraded collector disc.The motor speed is being monitored continuously and, the speed fluctuations result in a deviation between measured and expected ventilator piston position.To prevent from damages the system is designed to shut down automatic ventilation and to alert the user to this condition by means of a corresponding alarm.Manual ventilation and the monitoring functions remain available to the full extent which - in the particular case, enabled the user to finish the surgical procedure.Drager finally concludes that the device responded as specified upon the malfunction of a single wear-and-tear component; no patient consequences have been reported.The repair exchange of the motor assembly has fully solved the reported problem.Proper function of the entire device was verified by testing after the repair measures.The number of similar cases, related to the same root cause, is within the expected range of the respective risk assessment and thus accepted.
|