The device was sent into the depot for a repair unrelated to this incident.Cardio help repair, complete pm ,full functional, calibration and safety tests as per service manual.Unit passed all tests.The cardio help was tested with a test circuit for 4 days at 4000 rpm with lpm set at 4.00.Unit ran 24 hours for 4 days wit now failures.Per the local cardiothoracic account manager the device was not being blamed for the patient incident.As stated by the customer, the affected hardware (hls-set/hls-module, used cannula) is no longer available.Therefore no further investigation possible.Customer suspected as most probable root cause "issue related to cannula positioning and or possible occlusion of some kind".
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