Patent ID: 8202241

Claim:
A blood purification system comprising a blood purification tubing and a blood purification apparatus, wherein the blood purification tubing has a blood drawing tubing part for feeding blood drawn from a patient to a blood purifier, a blood returning tubing part for returning blood in the blood purifier to the patient, a dialysate supplying tubing part for supplying a dialysate to the blood purifier, a drainage tubing part for performing drainage from the blood purifier, and a replacement fluid supplying tubing part for supplying a replacement fluid to the blood drawing tubing part or the blood returning tubing part, the dialysate supplying tubing part has a dialysate storage container, the drainage tubing part has a drainage storage container, the replacement fluid supplying tubing part has a replacement fluid storage container, the dialysate supplying tubing part, the drainage tubing part, and the replacement fluid supplying tubing part are each located to pass in a first planar panel and in a second planar panel, the dialysate storage container, the drainage storage container, and the replacement fluid storage container are installed in the second planar panel, flow paths connecting the first planar panel and the second planar panel, in the dialysate supplying tubing part, the drainage tubing part, and the replacement fluid supplying tubing part, are composed of a soft tube, the blood purification apparatus has a scale for measuring the second planar panel, and the soft tubes and location of the soft tubes are selected to satisfy the following formulas (1) and (2) when a weight of the second planar panel, with the three storage containers being empty, is B, a value obtained by subtracting the weight B from a weight of the second planar panel, with a liquid having a weight W placed only in the drainage storage container, is Wf, a value obtained by subtracting the weight B from a weight of the second planar panel, with a liquid having the weight W placed only in the dialysate storage container, is Wd, and a value obtained by subtracting the weight B from a weight of the second planar panel, with a liquid having the weight W placed only in the replacement fluid storage container, is Wr, and when each weight of B, Wf, Wd, and Wr is obtained from a numerical value measured by the scale of the blood purification apparatus | Wf−Wr|/W≦ 0.005 (1) | Wf−Wd|/W≦ 0.005 (2).