An analysis of the device logbook for the period in question shows that the device switched off on 18.01.24 at 09:07.A cause for the switch-off could not be found on the basis of the log recordings.The omniboard and the m48 processor board were replaced on site.The analysis of the components received showed that the omniboard was functioning correctly, but the processor board could be identified as the cause of the reported symptoms.If the processor board is faulty, the device issues an alarm and stops automatic ventilation.In this case, the patient can continue to be ventilated in manual emergency mode or with an emergency manual ventilation bag.As initially reported, the emergency oxygen supply continued to work so that the operation could be completed with the bag.After replacing the components mentioned, no further abnormalities were detected.The field failure rate was assessed as acceptable.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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