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This report is being submitted as follow up no.1 to provide the device return date and the completed investigation results.Visual inspection upon receipt revealed no defects.Saline solution was filled in the blood phase.With the blood outlet port side clamped, an air pressure of 2kgf/cm2 was applied to the blood phase from the blood inlet port side, while the actual sample being observed for any leak.No leak was confirmed.Colored saline solution was used for better visibility.The actual sample was built into a circuit with tubes.The procedures instructed in the ifu were followed, and the actual sample was primed with colored saline solution.No air remained inside the oxygenator.After the above test, the saline solution was circulated at the flow rate of 0.5l/min, where an air was applied into the gas phase at 0.5l/min - 20l/min.There was no air bubble going into the blood phase.After the above test, during the circulation at the flow rate of 4l/min., the pump on the cardioplegia side was rotated at the flow rate of 1l/min.There was no air bubble going into the blood phase.After the above test, the saline solution was circulated at the flow rate of 4l/min with the actual sample being set on a position higher than that in above test.There was no air bubble going into the blood phase.After the above test, the saline solution was circulated at the flow rate of 4l/min with the liquid level in the reservoir being lowered to 200ml.There was no air bubble going into the blood phase.The investigation results verified that the actual sample was the normal product with no anomaly related to air entrainment.The exact cause of the reported event cannot be definitively determined based on the available information.The ifu states: "when capiox rx25 oxygenator module is used separately from the hardshell reservoir, set the module so that the upper end of the fibers is lower than the blood level in the venous reservoir.This prevents gaseous emboli from entering the blood phase from the gas phase.Do not obstruct gas outlet port.Avoid build-up of excess pressure in the gas phase to prevent gaseous emboli entering the blood phase.Pressure in the blood phase should always be higher than that in the gas phase to prevent gaseous emboli entering the blood phase.The gas flow rate should not exceed 20 l/min.Excessive gas flow rate will bring about pressure increase in the gas phase, allowing gaseous emboli to enter the blood phase.During recirculation, do not use pulsatile flow and do not stop the blood pump suddenly as these actions may cause gaseous emboli to enter the blood phase from the gas phase due to inertia force.To prevent gaseous emboli from entering the blood phase, make sure that the arterial pump flow rate always exceeds the flow rate of the cardioplegia line.The blood flow rate of the cardioplegia line should not exceed 1l/min.".
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