Blood purification apparatus with a bypass line that bypasses an ultrafiltration pump

A blood purification apparatus comprising:

• a blood circuit including an arterial blood circuit and a venous blood circuit through which blood of a patient extracorporeally circulates;
• a blood purification device provided between the arterial blood circuit and the venous blood circuit and that purifies the blood flowing in the blood circuit;
• a dialysate introduction line through which dialysate is introduced into the blood purification device, wherein the dialysate is provided at a preset timing;
• a dialysate drain line through which drain liquid from the blood purification device is drained;
• an ultrafiltration pump that removes water from the blood flowing in the blood circuit through the blood purification device,
• a bypass line that bypasses the blood purification device and flows the dialysate in the dialysate introduction line into the dialysate drain line,
• a fluid delivering device that delivers the dialysate in the dialysate introduction line to the blood purification apparatus;
• a dialysate supply line that extends between and connects the dialysate introduction line and the blood circuit;
• a closing device closing a flow route of the dialysate introduction line that extends between a connection to the bypass line and the blood purification device;
• a supply line closing device in the dialysate supply line that closes the dialysate supply line;
• and
• a control device that is a microprocessor that controls pumps, the closing device, and the supply line closing device, and further controls:
• the fluid delivering device,
• wherein while the ultrafiltration treatment is in progress, the control device checks the preset timing to determine whether the preset timing has been reached, and if the preset timing has not been reached, the ultrafiltration treatment is performed without delivery of the dialysate into the bypass line, and if the preset timing is reached, the ultrafiltration treatment is performed with delivery of the dialysate into the bypass line;
• wherein the blood purification apparatus performs substitution or blood return by supplying the dialysate in the dialysate introduction line to the blood circuit,
• wherein, in the ultrafiltration treatment in which the ultrafiltration pump is activated for ultrafiltration while the introduction of the dialysate through the dialysate introduction line into the blood purification device is stopped, dialysate delivery is performed while the introduction of the dialysate into the blood purification device is prevented;
• and
• wherein the preset timing is a timing of an immediate response to a blood return or an emergency fluid infusion and at the blood return or the emergency fluid infusion the control device closes the closing device of the dialysate introduction line and opens the supply line closing device in the dialysate supply line so that dialysate from the dialysate supply line moves fluid to provide the blood return or the emergency fluid infusion.