Device for calculating the blood flow in a vessel access.

摘要

Device for calculating the blood flow in an access to a vessel to a device for extracorporeal blood treatment in which blood comes through an arterial branch of an extracorporeal circuit which is in fluid connection with the vascular access in a blood connection, reaches the processing unit of the blood treatment device of the blood and through a venous branch of the extracorporeal blood circuit, which is in fluid connection with the vascular access in a venous connection, is led back, being connected in the circuit extracorporeal a blood pump, with a control unit (18) for varying the flow rate of the blood pump, an arterial measurement and / or venous ( 20, 22) for measuring the pressure part, pven in the venous branch and arterial (19, 21) respectively of the extracorporeal circuit (2) with open vascular access, whilst blood is flowing therethrough between the artery connection l venous (12, 13) and for measuring the pressure part comp, pven comp in the arterial and venous branch (19, 21) respectively with interrupted vascular access, whilst no blood is flowing therethrough between the blood connection and venous, varying blood flow QB in the extracorporeal circuit between measurements, a memory unit (25) for memorizing the values ​​of blood pressure and / or venous measuring, and a calculation unit (27), which is configured such that, from at least two measured blood pressure values ​​and / or venous part, pven can be determined, with open vascular access and at least two measured blood pressure values ​​and / or venous part comp, pven comp, with interrupted vascular access, the blood flow QF in the open vascular access between the arterial and venous connection.