Single needle dialysis (SND) is performed with a single needle that often causes blood recirculation. To date, optimal operating conditions of SND have not been determined to minimize recirculation. In this study, we evaluated whether the stopping position of a blood pump roller affected dialysis efficiency. First, we determined three stopping positions with different venous pressures. Then, we estimated recirculation volume at each position based on the flow rate. When a stopping position could achieve the most effective tube occlusion, the recirculation volume was minimized, suggesting that the position allowed optimal dialysis operation.
