Patent ID: 8858487

Claim:
A blood purification apparatus comprising: a blood purifier including a blood purification membrane performing blood purification in the blood purification membrane; an arterial blood circuit with a proximal end connected to the blood purifier and a blood pump disposed in the arterial blood circuit; a venous blood circuit with a proximal end connected to the blood purifier; an arterial air trap chamber connected to the arterial blood circuit; a venous air trap chamber connected to the venous blood circuit; an overflow line extending from a top of the venous air trap chamber for discharging replenishment fluid in the venous air trap chamber to the ambient conditions by causing the replenishment fluid to overflow; a dialysate introduction line introducing a dialysate into the blood purifier; a dialysate discharge line discharging the dialysate from the blood purifier; a fluid infusing line enabling a replenishment fluid to flow in from one end, and another end connected directly to the arterial air trap chamber or directly to the venous air trap chamber; a fluid supplying device supplying the replenishment fluid flowing in the fluid infusing line to the arterial blood circuit or the venous blood circuit via the arterial air trap chamber or the venous air trap chamber; and during priming, the other end of the fluid infusing line is connected to the same site as that of a blood purification treatment process, a tip of the arterial blood circuit is directly connected to a tip of the venous blood circuit in a communication state, and the blood purification apparatus further includes a control device capable of controlling discharge of the replenishment fluid from the overflow line, by driving the blood pump in normal rotation or reverse rotation direction while supplying the replenishment fluid from the fluid infusing line.