Patent ID: 8792089

Claim:
A device for determining a concentration of a constituent of blood in a hose line of an extracorporeal blood circuit of an extracorporeal blood treatment apparatus, comprising: a clamping unit comprising a first receiving element and a second receiving element configured to clamp the hose line such that the hose line clamped between the first and second receiving elements has a square cross-section; a measurement unit configured to couple electromagnetic radiation through the hose line into the blood and measure the electromagnetic radiation emerging through the hose line from the blood; and a computing and evaluation unit configured to determine the concentration of a constituent of blood, said computing and evaluation unit cooperating with the measurement unit; wherein the clamping unit comprises an actuation mechanism configured to apply a clamping force such that the first and second receiving elements are moved towards one another from a first position releasing the hose line into a second position clamping the hose line, the actuation mechanism comprising an electric motor for driving the actuation mechanism.