Blood purification device having improved serviceability

A blood purification device to perform blood purification treatment through a blood purifier, the blood purification device comprising:

• a dialysate supply-and-discharge unit that supplies a dialysate to the blood purifier and discharges a waste liquid from the blood purifier;
• an extracorporeal circulation unit comprising an extracorporeal circulation part to extracorporeally circulate blood of a patient through the blood purifier;
• and
• a control unit capable of controlling the dialysate supply-and-discharge unit and the extracorporeal circulation unit,
• wherein the dialysate supply-and-discharge unit comprises a water removal control part to control an amount of water removed from the blood, the water removal control part comprising:
• a balance control mechanism that delivers liquids so that an amount of the dialysate supplied to the blood purifier from the balance control mechanism is equal to an amount of the waste liquid removed from the blood purifier by the balance control mechanism,
• a bypass tube that bypasses the balance control mechanism, and
• a water removal pump for removing water from blood circulated through the extracorporeal circulation unit, the water removal pump being arranged on the bypass tube such that removal of water from the blood circulated through the extracorporeal circulation unit increases the amount of the waste liquid to be more than the amount of the dialysate supplied to the blood purifier, and
• wherein the extracorporeal circulation unit is configured as a separate component from the dialysate supply-and-discharge unit.