Safety apparatus for extracorporeal blood treatment

A blood purification device comprising:

• an extracorporeal blood circuit with a blood inflow to a dialysis unit for blood removed from a patient and a blood outflow from the dialysis unit for blood being guided back into the patient, wherein the dialysis unit comprises an inflow for a dialysis solution and a dialysate outflow,
• a citrate anticoagulation apparatus, wherein citrate is supplied to the extracorporeal blood circuit at a citrate supply point upstream of the dialysis unit and a substitute medium dosing apparatus, wherein substitution medium is supplied at a substitution medium supply point downstream of the dialysis unit,
• a control loop for controlling the acid-base balance of the blood, wherein bicarbonate is supplied to the blood by means of an aqueous bicarbonate-containing solution, wherein at least one measuring means for measuring a blood buffer parameter is associated with the control loop and upstream of the citrate supply point in the extracorporeal blood circuit, wherein the blood buffer parameter is selected from the group consisting of bicarbonate concentration and CO2 partial pressure, and wherein a signal corresponding to the measured actual value of the blood buffer parameter can be supplied to a control apparatus, which regulates the actual value of the blood buffer parameter via the supply of bicarbonate to a predeterminable intended value or intended value range,
• at least one pH-measuring means, which is arranged upstream of the citrate supply point in the extracorporeal blood circuit, wherein a signal corresponding to the pH value can be supplied to an alarm apparatus, which triggers an alarm signal if a predeterminable pH value or a pH-value range is exceeded or undershot,
• wherein the arrangement of the at least one measuring means for measuring a blood buffer parameter located upstream of the citrate supply point in the extracorporeal blood circuit and the at least one pH-measuring arranged upstream of the citrate supply point are configured to detect and prevent or treat disturbances of the acid-base balance during an extracorporeal blood purification selected from the group of compensated acidosis, non-compensated acidosis, compensated alkalosis and compensated or non-compensated alkalosis,
• at least one additional measuring means for measuring a blood buffer parameter that is associated with the control loop and arranged downstream of the dialysis unit and upstream of the substitution medium supply point in the extracorporeal blood circuit, and
• at least one additional pH-measuring means that is arranged downstream of the substitution medium supply point in the extracorporeal blood circuit, wherein a signal corresponding to the pH value can be supplied to the alarm apparatus, which triggers an alarm signal if a predeterminable pH value or pH-value range is exceeded or undershot.