Investigation: the disposable set was unavailable for return and investigation.A photograph was provided by the customer.Upon photographic inspection, air was noted on the right side of the return pump header near the reservoir on the cassette and no blood in the line leading into the top of the reservoir.A review of the device history record (dhr) for this unit showed no irregularities during manufacturing that were relevant to this issue.Root cause: the customer stated that this occurred during first return cycle.The absence of blood in the line feeding the reservoir means the inlet pump was not pumping fluid into the reservoir at the time the picture was taken.This indicates that air shown in the return pump did not actually occur during return cycle.A more likely scenario, based on the submitted picture, indicates that the air in the return line actually occurred sometime during blood prime when the return pump reverses and draws anticoagulated blood up the return line until the low level sensor is covered.In doing so, the system removes air from the draw and return lines by pumping it into the reservoir.Visibility of air in this tubing during blood prime without alarming is the normal function of the trima accel system.However, since the run data file is not available for analysis, it cannot be conclusively confirmed the air was present in the line at the end of blood prime just prior to first cycle.
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