Patent ID: 8500671

Claim:
An apparatus for extracorporeal blood treatment in a single-needle operation, comprising: a first blood-conveyance device configured to convey blood into a blood-collection device; a second blood-conveyance device configured to convey blood out of the blood-collection device; and a control unit configured to adjust a delivery rate Q b of the first blood-conveyance device and a delivery rate Q SN of the second blood-conveyance device, wherein the control unit is configured such that the operation of the first and second blood-conveyance devices is continuously switched over between an arterial phase and a venous phase, whereby in the arterial phase during simultaneous operation of the first and second blood-conveyance devices, the delivery rate Q b of the first blood-conveyance device is greater than the delivery rate Q SN of the second blood-conveyance device, such that blood is removed from the patient in the arterial phase, and in the venous phase during simultaneous operation of the first and second blood-conveyance devices, the delivery rate Q b of the first blood-conveyance device is smaller than the delivery rate Q SN of the second blood-conveyance device, such that blood is fed to the patient in the venous phase.