Abstract: An extracorporeal blood treatment apparatus includes an extracorporeal circuit, a dialysis fluid circuit, and a dialyzer. A blood side and a dialysis fluid side of the dialyzer are separated by a membrane. A control unit automatically empties the dialyzer by setting a reduced pressure or negative pressure in the dialysis fluid circuit and by a passage of fluid from the blood side to the dialysis fluid side via the membrane. Once fluid has passed from the blood side to the dialysis fluid side and the blood side has been emptied, the control unit brings about a passage of air from the blood side to the dialysis fluid side via the membrane, and a displacement of the fluid out of the dialysis fluid side toward a dialysis fluid outflow by continued setting of the reduced pressure or negative pressure in the dialysis fluid circuit.

Abstract: An extracorporeal blood treatment device includes an extracorporeal circuit, a dialyzer, a dialyzing liquid circuit and a control unit. A venous section and an arterial section of the extracorporeal circuit each includes a sensor configured to acquire a hematocrit percentage in a liquid flowing through the corresponding section. The control unit controls reinfusion of blood such that a dialyzing liquid is supplied from the dialyzing liquid circuit via a dialyzer membrane to the extracorporeal circuit, which displaces blood present in the extracorporeal circuit towards a patient to return the blood to the patient via the venous section and arterial section. Reinfusion in the corresponding section of the extracorporeal circuit is discontinued if it is acquired by the corresponding sensor or calculated or predicted by the control unit based on information acquired by the corresponding sensor that the hematocrit percentage falls below a predetermined limit value.

Abstract: An extracorporeal blood treatment device and a method for automatic priming of an extracorporeal blood treatment device. The device includes an extracorporeal circuit, a dialyser, a dialysis liquid circuit and a control unit. The control unit is designed to control the priming such that a liquid is delivered from the dialysis liquid circuit via a membrane of the dialyser to the extracorporeal circuit, and to actuate valves and/or pumps in the dialysis liquid circuit such that pressure builds up in the dialyser on the dialysis liquid side. The control unit actuates a flow machine in the extracorporeal circuit to perform a push cycle, in which the flow machine pushes air into the extracorporeal circuit, and a pull cycle, in which the flow machine draws air out from the extracorporeal circuit, to assist a transfer of the liquid through the membrane of the dialyser during the priming process.

Abstract: A method of manufacturing pumps of different performances for use in a blood treatment device, preferably a dialysis machine, having a pump housing or a pump housing portion for supportingly holding two gear wheels in meshing engagement. The method includes the step of primary shaping of a universal pump housing blank with all features common to the different pumps as well as with such oversizes as to allow machining for manufacturing all different pumps from the same primary-shaped pump housing blank. The method also includes the step of individualizing the universal pump housing blank by machining in the region of the oversizes to achieve the respective performance.

Abstract: A method for referencing a pressure or force sensor configured to measure pressure in a tube filled with fluid. The pressure or force sensor is located in an extracorporeal circuit and integrated into or inserted in a clamping device The method includes: (1) referencing a force or pressure reference signal which the pressure or force sensor outputs, with a force or pressure reference signal measured by a force or pressure reference sensor; and (2) using a dialysis fluid side force or pressure reference sensor in a dialysis fluid circuit configured to detect the pressure in the dialysis fluid circuit, for referencing a pressure sensor or force sensor in the extracorporeal circuit. A device uses a dialysis fluid side force or pressure reference sensor in the dialysis fluid circuit that detects pressure in the dialysis fluid circuit, for referencing at least one pressure or force sensor in the extracorporeal circuit.

Abstract: A device and method for calibrating a first pressure sensor. The method includes: a) recursive analysis and forecasting of at least one correction function for finding a correction signal for the correction of a drift signal with the aid of a corresponding pressure reference signal, which is measured by the first pressure reference sensor, at constant internal pressure and at constant internal tube temperature; b) first calibration of a force signal, measured by the first pressure sensor and corrected using the correction signal, with the pressure reference signal, which is measured by the first pressure reference sensor, prior to an active use of the tube; and c) second calibration of the force signal, measured by the first pressure sensor and corrected using the correction signal, with the pressure reference signal, which is measured by a second pressure reference sensor during an active use of the tube.