Extracorporeal blood treatment apparatus and method for monitoring pressures in an extracorporeal blood treatment apparatus

Extracorporeal blood treatment apparatus, comprising:

• a blood treatment device;
• an extracorporeal blood circuit coupled to the blood treatment device and comprising a blood withdrawal line connected to a blood inlet port of the blood treatment device and blood return line connected to a blood outlet port of the blood treatment device;
• a blood pump, wherein a pump section of the extracorporeal blood circuit is configured to be coupled to the blood pump;
• a first pressure sensor located in a first measurement site on the on the blood withdrawal line upstream of the blood treatment device;
• a second pressure sensor located in a second measurement site on the blood return line downstream of the blood treatment device;
• an electronic control unit operatively connected to the first pressure sensor and to the second pressure sensor, wherein the electronic control unit is configured to:
• receive, from the first pressure sensor, a signal correlated to a measured blood pressure in the first measurement site;
• receive, from the second pressure sensor, a signal correlated to a measured blood pressure in the second measurement site;
• and
• correct the measured blood pressure of at least one of:
• the first pressure sensor through a mathematical correction model to obtain an actual blood pressure in a first reference site other than the first measurement site, wherein a first circuit section is positioned between the first reference site and the first measurement site, and the mathematical correction model is a model of at least one pressure drop in the first circuit section;
• and
• the second pressure sensor through a mathematical correction model to obtain an actual blood pressure in a second reference site other than the second measurement site, wherein a second circuit section is positioned between the second reference site and the second measurement site, and the mathematical correction model is a model of at least one pressure drop in the second circuit section.