Patent ID: 7931610

Claim:
A blood purification apparatus comprising: a blood circuit route having an arterial blood circuit route and a venous blood circuit route to circulate extracorporeally blood collected from a patient; a blood pump provided in said arterial blood circuit route; a blood purification device that is connected between said arterial blood circuit route and said venous blood circuit route, and purifies the blood flowing in said blood circuit route; dialysate introduction and dialysate discharge lines that are connected to said blood purification device; a dialysate introduction and discharge device that straddles said dialysate introduction and dialysate discharge lines for the purposes of introducing dialysate from said dialysate introduction line to said blood purification device; and of discharging from said dialysate discharge line the dialysate introduced into said blood purification device; a pressurizing pump that is connected to said dialysate discharge line between said blood purification device and said dialysate introduction and discharge device, and that causes dialysate to flow from said blood purification device into said dialysate introduction and discharge device; a blood concentration device is configured to impart a specific peak to change blood concentration; and a detection device configured to detect the specific peak imparted by said blood concentration device; wherein said blood concentration device comprises: an atmosphere release line, the tip of which is open to atmosphere, that extends from between said pressurizing pump and said dialysate introduction and discharge device in said dialysate discharge line; and a valve unit that can open or close said atmosphere release line; and said blood concentration device is configured to impart said specific peak by rapidly concentrating the blood flowing in said blood purification device for a short period of time.