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This report is being submitted as follow up no.1 to update and to provide the completed investigation results.The actual device was received for evaluation.Visual inspection revealed that the three-way valve attached by the customer to the venous blood inlet port on the reservoir had been broken.On the remainders of the actual sample, there was not any other obvious anomaly, such as a break, in the appearance.The broken three-way stopcock was replaced with a factory-retained yellow cap.The actual sample was, then, built into a circuit with tubes and saline solution was circulated in it.No leak was observed.Subsequently, the blood phase of the oxygenator module was filled with saline solution.With the blood outlet port side clamped, an air pressure of 2kgf/cm2 was applied to the blood phase from the blood inlet port.No leak was observed.Then, the water phase of the heat exchanger housed in the oxygenator module was filled with water.With the water outlet port side clamped, an air pressure of 3kgf/cm2 was applied to the water phase from the water inlet port.No leak was observed.Colored water was used for better visibility of the behavior of the solution.Based on the provided information and investigation results, there is no definitive evidence that this event was related to a device defect or malfunction.The investigation results verified the returned sample was of the normal product.The exact cause of the reported event cannot be definitively determined based on the available information.
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