It was reported that while in use the ventilator shut down without any audible alarm and the screen went black.The patient was removed from the ventilator and placed on an alternate ventilator.A patient desaturation was noted, but was able to be corrected after the patient was given supplemental o2 (delivery method not defined) and being placed on an alternate ventilator.The patient was not harmed or injured as a result of the reported event.The service engineer (se) inspected the device.The se found all the alarms working and registering the event log.Review of the ventilator diagnostic report found multiple therapy driven error codes and a 'low internal battery' error code.The se replaced the power management (pm) board.The unit was checked overall, run in tested, cleaned, functionally tested and no abnormality was confirmed.
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