A draeger technician evaluated the device and the device log file.During testing the device displayed an expiratory flow sensor failure; the customer changed the flow sensor then.The tests were repeated and completed with no further issues.The records in the log file indicate a sudden drop in airway pressure which was not caused by the device itself.Based on experience, this happens when a bronchial suction system is being used intraoperatively.The device responds to this condition with a shut-down of automatic ventilation for safety reasons.The hospital's biomed could neither confirm nor deny that a suction maneuver was performed but this theory is substantiated by the fact that no persisting error condition of the ventilator unit was found when the device was tested in follow-up of the event.The flow sensor issue cannot be put in causal connection to a ventilator failure; it is just the end of life of a consumable accessory which affects monitoring functionality only.It may have occurred after the ventilator shut-down during the period of following manual ventilation.
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