Device for extracorporeal blood treatment and method for operating an extracorporeal blood treatment device

Abstract

The invention relates to an apparatus for extracorporeal blood treatment, the apparatus comprising: a hydraulic system B comprising a plurality of lines (7), (9), the hydraulic system being used to provide a dialysate for a dialyzer (3); and a control system (15) comprising a plurality of electrical components (17A), (17B), (17C). In addition, the invention relates to a method for operating an apparatus for extracorporeal blood treatment, the apparatus comprising: a hydraulic system comprising a plurality of lines, the hydraulic system being used to provide a dialysate for a dialyzer; and a control system comprising a plurality of electrical components, wherein the dialysate is prepared using a liquid supplied to the apparatus for extracorporeal blood treatment. The extracorporeal blood treatment apparatus is a blood treatment apparatus having a central interface (11) in order to be able to supply a liquid, in particular a permeate (pure water), to the machine. The blood treatment device is characterized in that a cooling device (19) is provided for cooling at least one electrical component (17A), (17B), (17C) of a control system (15), wherein the cooling device uses a liquid, in particular a permeate (purified water), which is centrally supplied to the device for dissipating heat from the electrical component. The cooling device (19) has at least one cooling body (21) which can be cooled by means of a liquid and is in thermal contact with the at least one electrical component (17A), (17B), (17C), wherein the cooling device (19) has at least one inlet (22A) and at least one outlet (22B), wherein the inlet is fluidically connected to a connection (11) for the inflow of liquid and the outlet is fluidically connected to an outflow (10), (31).

Description

Technical Field

[0001] The invention relates to an apparatus for extracorporeal blood treatment, the apparatus comprising: a hydraulic system with a plurality of lines for providing a dialyzer or a dialysis treatment, wherein during the treatment, the dialyzer is flowed through by the dialyzer and / or the dialyzer is supplied as a substitute to an extracorporeal blood hose system; and a control system comprising at least one, usually a plurality of electrical components. In addition, the invention relates to a method for operating an apparatus for extracorporeal blood treatment, the apparatus comprising: a hydraulic system with a plurality of lines for providing a dialyzer or a dialysis treatment, wherein during the treatment, the dialyzer is flowed through by the dialyzer or the dialyzer is supplied as a substitute to an extracorporeal blood hose system; and a control system comprising at least one, usually a plurality of electrical components, wherein the dialyzer is prepared using the liquid supplied to the apparatus for extracorporeal blood treatment. Background Art

[0002] During dialysis, the blood to be treated flows through the blood chamber of the dialyzer, which is divided into a blood chamber and a dialysate chamber by a semipermeable membrane in an extracorporeal blood circuit, while the dialysate flows through the dialysate chamber of the dialyzer. The extracorporeal blood circuit includes: a blood conveying line, which leads to the blood chamber; and a blood output line, which leaves the blood chamber. The hydraulic system of the device for extracorporeal blood treatment has a line leading to the dialyzer for conveying fresh dialysate and a line leaving the dialyzer for conveying the used dialysate to the outflow portion. A pump is provided for conveying the liquid. The control of all components of the device for extracorporeal blood treatment is carried out by means of a control system, which includes multiple electrical components. The control system can be composed of one or more components. The description is exemplarily directed to the dialysate. For the purposes of the present invention, the term dialysate also includes the case of blood filtration, in which the dialysate is not conveyed to the dialysate chamber, but is conveyed to the blood conveying line and / or the blood output line as a substitute, and the liquid is extracted via the dialyzer. For the purposes of the present invention, the term dialysis includes all combinations of said methods.

[0003] The dialysate can be produced in the dialyzer from a permeate (pure water) and one or more concentrates. The dialyzer has a water connection for conveying the permeate. The dialysate is arranged in the hydraulic system of the machine. However, so-called "bedside stations" are also known and are embodiments in which the dialysate is conveyed to the dialyzer from the outside.

[0004] When "water" or "pure water" is mentioned below, this is also understood to mean the dialysate or flushing liquid which is supplied to the dialyzer from the outside or provided in the dialyzer. "Water" and "pure water" can have the same meaning or different meanings for the purposes of the present invention. Whether water can also be pure water is inferred from the technical circumstances for a person skilled in the art. It is questionable whether the terms are to be understood as synonyms.

[0005] Dialysis machines are increasingly being constructed in a compact manner. The reason for this development is the improved space saving of transport possibilities in the case of limited space in the clinic or in the area of ​​home dialysis. Another development is that thermal cleaning or thermal disinfection methods have become generally accepted in dialysis machines and are becoming increasingly important. The use of chemical agents can be reduced in particular by the methods mentioned. During thermal disinfection, the permeate heated to a temperature of more than 80° C. and / or the permeate mixed with a disinfectant circulates in the hydraulic system. The terms thermal cleaning and thermal disinfection are to be understood synonymously in this specification, unless a person skilled in the art infers from the context that it must be one or the other of the methods described. In principle, disinfection also has a cleaning effect, while cleaning does not necessarily have to cause disinfection. Thus, for example, cleaning can be carried out at a significantly lower temperature than disinfection.

[0006] In dialysis machines with a compact design, thermal management becomes increasingly challenging. Especially during thermal disinfection, the temperature within the housing of the dialysis machine can rise significantly. High temperatures inside the housing are necessary or at least helpful for reaching the temperatures required for thermal disinfection. The air temperature inside the device can be 50° C. or 65° C.

[0007] High air temperatures are problematic for electrical components of the control system, such as power semiconductors or processors. The problem is further exacerbated by the fact that in compact dialysis devices, the electronics are located in close spatial proximity to components of the hydraulic system.

[0008] Many electronic components only tolerate temperatures of up to a maximum of 45° C. / 50° C. In addition, the durability of the electrical components decreases significantly when certain temperatures are exceeded. Therefore, sufficient cooling of the electrical components is necessary. Cooling of the electrical components is usually carried out with the aid of known cooling bodies, on which the components are mounted. However, this cooling has proven to be insufficient when the temperatures in the housing interior are high.

[0009] Therefore, the prior art includes the following dialysis machines, which have an additional fan, which is controlled as required. The thermal problem can be solved by means of a fan. However, the use of a fan is associated with disadvantages.

[0010] Firstly, fans cause additional production costs. It should be taken into account that fans have only a limited lifespan. In addition, fans increase the ingress of dust into the device. In addition, higher noise levels are caused. In addition, air cooling in countries with very high external temperatures has not always been found to be suitable. Summary of the invention

[0011] The invention is therefore based on the object of creating an apparatus for extracorporeal blood treatment in which the above-mentioned disadvantages are avoided. In particular, the invention is based on the object of providing an apparatus for extracorporeal blood treatment which operates reliably even at high external temperatures. A further object of the invention is to specify a method by means of which an apparatus for extracorporeal blood treatment can be operated without the above-mentioned disadvantages.

[0012] The solution to this object is achieved according to the invention by means of the features of the independent claim. The dependent claims relate to preferred embodiments of the invention.

[0013] The device for extracorporeal blood treatment according to the invention is a blood treatment device which has a central interface so that liquid, in particular permeate (pure water), can be fed to the machine. The liquid can be used to prepare a dialysate or for thermal disinfection. Since the liquid is fed, a sufficient amount of liquid is available. The temperature of the liquid is as independent of the room temperature as possible and can be set to a preset value by means of a central supply device, which preset value can also be below the room temperature which is as high as possible.

[0014] The device has a cooling device for cooling at least one electrical component of the control system, and the cooling device uses a liquid, especially a permeate (pure water), which is centrally supplied to the device to conduct away the heat of the electrical component. The cooling device has at least one cooling body that can be cooled by means of a liquid, and the cooling body is in thermal contact with at least one electrical component, wherein the cooling device has: at least one inlet, which is fluidly connected to an interface for liquid inflow; and at least one outlet, which is fluidly connected to an outflow portion. The thermal contact is preferably a contact contact or a directional contact, wherein the cooling body directly contacts the circuit board, for example, or the cooling body is oriented so that its cooling effect is effectively transferred to the electrical component. This can be achieved in the following way: the cooling body is arranged, for example, at a distance of less than 30 cm, preferably 20 cm or 10 cm from the electrical component.

[0015] With the aid of a cooling device, it is possible to cool individual, multiple or all thermally loaded electrical components of an apparatus for extracorporeal blood treatment. In particular, it is possible to cool individual, multiple or all thermally loaded electrical components which have the following specifications: they should not be heated above 45° C. or 50° C. or they can withstand temperatures of more than 45° C. or 50° C. during thermal disinfection or thermal cleaning when the apparatus is in operation without cooling. In this context, electrical components are understood to mean all electrical or electronic components of a control system. A control system is understood to mean all electronic devices of an apparatus for extracorporeal blood treatment, that is, all electrical or electronic components or assemblies which can also form individual circuits or assemblies. The cooling device can also include a plurality of cooling bodies.

[0016] It is not important for the present invention how the cooling body is formed, the cooling body is in thermal contact with at least one component and is cooled by means of liquid. But what is decisive is that the cooling body is in thermal contact with the liquid so that heat can be conducted out. The cooling body formed of a heat-conducting material, such as aluminum, can be rinsed from all sides by liquid and / or thoroughly rinsed by liquid. For example, a channel can be formed in the cooling body. Liquid can flow in via one or more inlets and flow out via one or more outlets. Liquid can be discarded subsequently. Liquid is guided to an outflow portion, which can be an additional outflow portion or the outflow portion can be an outflow portion for used dialysate that exists by default in the dialysis machine.

[0017] Cooling at least one cooling body by means of liquid is preferably carried out in the following operating mode of the device for extracorporeal blood treatment, in which the thermal load is the highest. This operating mode can be a thermal disinfection of the hydraulic system, in which a liquid heated to a preset temperature flows through at least a part of the pipeline of the hydraulic system. The present invention is advantageously utilized: in a dialysis machine, the inflow section for supplying a liquid, especially a central liquid supply of a permeate, is usually not included in the thermal disinfection cycle. Therefore, the cooling device can be connected to the inflow section or to a bypass line connected to the inflow section fluid, which bypass line can be connected to the outflow portion. The cooling device can therefore be operated independently of thermal disinfection. By this arrangement in the inflow section, it can be additionally realized that the waste heat of the electrical component heats the cooling liquid, which is then at least partially or completely guided into the hydraulic system and does not need to be heated as much as for treatment, for thermal disinfection. Therefore, energy saving can be achieved.

[0018] A preferred embodiment provides that the hydraulic system has a liquid configuration device, which has an inlet, wherein a connection for the inflow of liquid is connected to the inlet of the liquid configuration device via an inflow line. The inflow line forms an inflow section for the central liquid supply. The liquid can be a dialysate, wherein the liquid configuration device is a dialysate configuration device.

[0019] In this regard, the liquid preparation device is understood to be all components of the dialysis machine for preparing the liquid, for example, for preparing, heating or venting the dialysis fluid. The liquid preparation device can include, for example, an input chamber or venting chamber for collecting the liquid or a heating device.

[0020] If the liquid preparation device has an inlet chamber for collecting the liquid, the inlet of the liquid preparation device can be the inlet of the inlet chamber. Therefore, the inflow section only includes the area upstream of the inlet chamber, so that when the delivery of liquid to the inlet chamber is interrupted or adjusted, the hydraulic system can be thermally disinfected independently of the delivery of liquid to the cooling device. In a particularly preferred embodiment, a mechanism for interrupting or adjusting the flow of liquid is provided in the inflow line.

[0021] The various embodiments have different configurations for installing the cooling device in an existing fluid system of a dialysis machine.

[0022] In a first embodiment, the inflow line has: a first section, which connects the interface for the inflow of liquid to the inlet of the cooling device; and a second section, which connects the outlet of the cooling device to the inlet of the liquid configuration device. The cooling device is therefore connected to the inflow line. During thermal disinfection, the delivery of liquid to the hydraulic system can be interrupted so that the liquid only flows to the cooling device. The outlet of the cooling device can be connected to the outflow fluid via a bypass line, and the outflow can be an additional outflow or an already existing outflow of the dialysis machine. In order to interrupt or adjust the liquid flow in the bypass line, the following mechanism is provided, which can be a valve or a throttle valve. The mechanism for interruption can also be a pump or a different combination of the mentioned mechanisms.

[0023] A particularly preferred embodiment provides that the cooling device has a temperature sensor for measuring the temperature of an electrical component which is in thermal contact with the cooling body and a control unit which actuates a mechanism for interrupting or regulating the flow of the liquid in the bypass line so that the temperature is below a predefined limit value. The control unit of the cooling device can also be a component of a central control and computing unit for the extracorporeal blood treatment.

[0024] In another embodiment, the first section of the additional cooling liquid pipeline connects the interface or inflow pipeline for the inflow of the liquid to the inlet of the cooling device, wherein the outlet of the cooling device is fluidly connected to the outflow portion via the second section of the cooling liquid pipeline, and the outflow portion can be an additional outflow portion or an already existing outflow portion of the dialysis machine. A mechanism for interrupting or adjusting the flow of the liquid is preferably provided in the cooling liquid pipeline. The cooling liquid pipeline is therefore a bypass pipeline. In this embodiment, the adjustment of the flow of the liquid can also be carried out in a manner related to the temperature of at least one component.

[0025] In another alternative embodiment, the first section of the flushing liquid pipeline branches off from the inflow pipeline and leads to the inlet of the cooling device, wherein the outlet of the cooling device is connected to the outflow portion fluid via the second section of the flushing liquid pipeline. Such a flushing liquid device can already be present in the dialysis machine to flush and / or disinfect the inflow section with liquid. The pipeline is then not only used for flushing and / or disinfecting the inflow section, but also for the inflow of liquid to the cooling device. The flushing liquid pipeline is therefore a bypass pipeline again. Temperature adjustment can also be performed again here.

[0026] Instead of temperature adjustment of the shutoff mechanism or valve in the pipeline, the shutoff structure or valve can also be time-controlled. For example, the shutoff mechanism or valve can be completely or partially opened or closed by the control unit in a preset time interval. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be described in detail below with reference to the accompanying drawings.

[0028] The accompanying drawings show:

[0029] Figure 1 A greatly simplified schematic diagram shows a first exemplary embodiment of a blood treatment apparatus according to the invention having a cooling device,

[0030] Figure 2 A second embodiment of a blood treatment apparatus according to the invention is shown,

[0031] Figure 3 A third embodiment of a blood treatment apparatus according to the invention is shown,

[0032] Figure 4 A fourth embodiment of a blood treatment apparatus according to the invention is shown. DETAILED DESCRIPTION

[0033] Figure 1 A greatly simplified schematic diagram of an embodiment of a blood treatment apparatus according to the invention is shown. The blood treatment apparatus comprises an extracorporeal blood circuit A and a hydraulic system B, which are only schematically shown. The extracorporeal blood circuit A comprises a blood chamber 1, and the hydraulic system B comprises a dialysate chamber 2 of a dialyzer 3. The blood chamber 1 and the dialysate chamber 2 of the dialyzer 3 are separated by a semipermeable membrane 4. In order to provide the dialysate, the hydraulic system B has a liquid preparation device 5, in particular a dialysate preparation device, which has an inlet 5A and an outlet 5B for a liquid for dispensing the dialysate, in particular a permeate (pure water). The permeate can be collected in an input chamber 6. In order to prepare the dialysate, the permeate is mixed with one or more concentrates. The remaining components 5C of the dialysate preparation device 5 are arranged in a central cavity 6. The permeate is mixed with one or more concentrates. Figure 1From the outlet 5B of the dialysate configuration device 5, a dialysate delivery line 7 leads to the inlet 2A of the dialysate chamber 2 of the dialyzer 3. The dialysate is transported by means of a dialysate pump 8. The outlet 2B of the dialysate chamber 2 is connected via a dialysate outlet line 9 to an outflow 10 for the used dialysate.

[0034] The description relates to the following phases, in which the patient is treated. In preparation for or after the treatment, the device does not need to have components of the extracorporeal blood circuit A and the dialyzer 3, or the dialysate delivery line 7 can be short-circuited with the dialysate discharge line 9 while bypassing the dialyzer 3. In addition, the device can have a disinfectant concentrate connection. Via the disinfectant concentrate connection, concentrated disinfectant can be supplied to the hydraulic system B and the desired disinfectant concentration can be provided in the hydraulic system B by mixing with water, which can be supplied to the hydraulic system B via the inflow section 14.

[0035] The permeate is supplied to a blood treatment apparatus at a central connection 11, which is connected to the inlet 6A of the inlet chamber 6 of the dialysate preparation device 5 via an inlet line 12. An inlet valve 13 is provided at the inlet 6A of the inlet chamber 6, so that the hydraulic system B can be separated from the inlet section 14.

[0036] exist Figure 1 Only the components of the hydraulic system B that are relevant to the invention are shown. The hydraulic system B can also include further components 30 , such as a balancing unit.

[0037] Furthermore, the blood treatment apparatus has a control system 15 which can include a plurality of circuits with electrical components. Figure 1 Only one circuit 16 having a plurality of components 17A, 17B, 17C is shown.

[0038] The blood treatment apparatus is provided with an operating mode for thermal disinfection of the hydraulic system B, in which the hydraulic system is flushed with a liquid which is supplied to the blood treatment apparatus at the central connection 11 .

[0039] For this purpose, the liquid, in particular the permeate, is heated to a temperature of more than 80° C. During thermal disinfection, the air temperature in the interior of the housing 18 of the blood treatment apparatus rises, which results in a thermal load on the electrical components 17A, 17B, 17C.

[0040] For cooling the electrical components 17A, 17B, 17C, a cooling device 19 is provided, which is described below for one embodiment. The electrical components 17A, 17B, 17C are located on a printed circuit board 20, which is mounted on a cooling body 21 so that the components are in thermal contact with the cooling body. The cooling body 21 has one or more channels with an inlet 22A and an outlet 22B so that a liquid can flow through the cooling body in order to remove heat from the cooling body. As cooling liquid for the cooling body, a permeate liquid is used which is centrally supplied to the machine.

[0041] In this embodiment, the cooling body 21 is connected to the inlet pipeline 12. The inlet pipeline 12 includes a first section 12A and a second section 22B, wherein the first section connects the interface 11 with the inlet 22A of the cooling body 21, and the second section connects the outlet 22B of the cooling body 21 with the inlet 6A of the input chamber 6. A bypass pipeline 23 is branched from the second section 12B of the inlet pipeline 12, and the bypass pipeline leads to the outflow portion 10. A bypass valve 24 is provided in the bypass pipeline 23.

[0042] During thermal disinfection, the inlet valve 13 at the input chamber 6 remains at least partially closed, so that the hydraulic system B is separated from the inlet section 14. The bypass valve 24 in the bypass line 23 is opened, so that the cold permeate for heat dissipation flows into the cooling body 21. The permeate then flows out into the outflow 10.

[0043] In one embodiment, in order to control the liquid flow, the cooling device 19 can have a control unit 25, which can be a component of the control and computing unit of the blood treatment device, that is, a part of the control system. The control unit 25 is connected to a temperature sensor 27 via a measuring line 26, which measures the temperature of the electrical component 17C of the circuit 16, and is connected to the inlet valve 13 and the bypass valve 24 via a control line 28. The control unit 25 compares the temperature measured by the temperature sensor 27 with a preset limit value, which is lower than the permitted operating temperature of the component. If the temperature is higher than the limit value, the control unit 25 opens the bypass valve 24, so that the permeate flows through the cooling body 21 for heat dissipation. If the temperature is lower than the limit value, the control unit 25 closes the bypass valve 24, so that the liquid flow is interrupted. Instead of the valve, a throttle valve can also be arranged in the bypass line 23, which presets a specific flow rate. The control unit 25 can also adjust the liquid flow into the hydraulic system B by only partially opening and closing the inlet valve 13. The control unit 25 can also control the liquid flow in the inlet line 12 so that the liquid flows primarily into the hydraulic system B, if such a flow is required due to the requirements of the hydraulic control. If the flow is not sufficient for cooling, the control unit 25 can cause a flow via the bypass line 23 as a secondary measure, for example by opening the valve 24.

[0044] In all the embodiments described here, a pump (not shown in the drawings) can be provided in the device, by means of which the liquid can be pumped through the bypass line. The pump can be, for example, a peristaltic pump or a diaphragm pump. In the described case, the pump 24 can be a peristaltic pump or a diaphragm pump.

[0045] Figure 2 A second embodiment of a blood treatment apparatus is shown, which differs from the first embodiment in the installation of a cooling device 19. Corresponding parts are provided with the same reference numerals. In the second embodiment, the cooling body 21 is not connected to the inlet line 12. A first section 29A of an additional cooling liquid line 29 branches off from the inlet line 12, which leads to the inlet of the cooling body 21. A second section 29B of the cooling liquid line 29 connects the outlet 22A of the cooling body 21 to the outflow portion 10. In order to adjust the coolant flow, a valve 24' is provided in the second section 29B of the cooling liquid line 29. The valve 24' in the cooling liquid line 29 can be adjusted by a control unit 25, such as the bypass valve 24 in the bypass line 23 of the first embodiment, in relation to the temperature measured by means of a temperature sensor 27.

[0046] Figure 3 A third embodiment of a blood treatment apparatus is shown, which differs from the second embodiment in that the valve 24″ for controlling the liquid flow is not arranged in the second section 29B of the cooling liquid line, but in the first section 29A. The liquid flow can be regulated as in the second embodiment. In addition, the third embodiment differs from the second embodiment in that the second section 29B of the cooling liquid line 29 does not lead to an outflow for used dialysate, but to an additional outflow 31 for the coolant. However, the second section 29B of the cooling liquid line 29 can also be connected to the outflow 10 for used dialysate in the third embodiment ( Figure 1 and 2 ). The third exemplary embodiment with a separate outflow 31 for the coolant has the advantage that contamination of the inflow section 14 by used dialysate emerging from the outflow 10 is excluded.

[0047] Figure 4Another alternative embodiment of a blood treatment apparatus is shown, which performs flushing or disinfection of the inflow section 14. For flushing or disinfection, a flushing liquid line 32 is provided in such a blood treatment apparatus, which branches from the inflow line 12 upstream of the inlet 5A of the dialysate preparation device 5, in particular at the end of the inflow section 14, for example, branches from the inflow line 12 upstream of the inflow valve 13 and preferably close to the inflow valve 13, and leads to a separate outflow section 31. The cooling body 21 is connected to the flushing liquid line 32 in this alternative embodiment. The flushing liquid line 32 includes a first section 32A, which branches from the inflow line 12 and leads to the inlet 22A of the cooling body 21, and a second section 32B, the first section branches from the inflow line 12 and leads to the inlet 22A of the cooling body 21, and the second section connects the outlet 22B of the cooling body 21 to the separate outflow section 31. The valve 24'" for regulating the coolant flow can be arranged in the second section 32B of the flushing liquid line 32. That is, in this exemplary embodiment, an already existing line is used to convey the coolant, which is otherwise used to convey the flushing liquid. The valves 13 and 24'" can be controlled as in the above-described embodiment.

Claims

1. A device for extracorporeal blood treatment, comprising: a hydraulic system (B) comprising a plurality of pipes (7, 9), the hydraulic system being used to provide a dialysate for dialysis treatment; and a control system (15) comprising at least one electrical component (17A, 17B, 17C), wherein the hydraulic system (B) has at least one interface (11) for allowing a liquid to flow into the device for extracorporeal blood treatment, in, The device for extracorporeal blood treatment comprises: an outflow for used dialysate, and a cooling device (19) for cooling at least one of the electrical components (17A, 17B, 17C) of the control system (15), the cooling device having at least one cooling body (21) which can be cooled by means of a liquid and which is in thermal contact with the at least one electrical component (17A, 17B, 17C), wherein the cooling device (19) has at least one inlet (22A) and at least one outlet (22B), the inlet being fluidically connected to the interface (11) for the inflow of liquid, and the outlet being fluidically connected to the outflow (10) for used dialysate or to the outflow (31) for the coolant, wherein the outflow (31) for the coolant is independent of the outflow (10) for used dialysate, It is characterized in that The hydraulic system (B) comprises a liquid configuration device (5) having an inlet (5A), wherein a connection (11) for the inflow of liquid is connected to the inlet (5A) of the liquid configuration device (5) via an inflow line (12), and wherein a bypass line (23, 29, 32) exits from the inflow line (12) and is fluidically connected to the outflow (10) for the used dialysate or the outflow (31) for the coolant, The liquid used to cool the cooling body (21) is the coolant.

2. The device for extracorporeal blood treatment according to claim 1, It is characterized in that The liquid configuration device (5) has an input chamber (6) for collecting liquid, wherein the inlet (5A) of the liquid configuration device (5) is the inlet (6A) of the input chamber (6).

3. The device for extracorporeal blood treatment according to claim 2, It is characterized in that A mechanism (13) for interrupting or adjusting the flow of liquid in the inlet pipeline (12) is provided downstream of a branch portion of the bypass pipeline (22, 29, 32) branching from the inlet pipeline (12).

4. The device for extracorporeal blood treatment according to any one of claims 1 to 3, It is characterized in that The inlet pipe (12) has a first section (12A) and a second section (12B), wherein the first section connects the interface (11) for allowing liquid to flow in with the inlet (22A) of the cooling device (19), and the second section connects the outlet (22B) of the cooling device (19) with the inlet (5A) of the liquid configuration device (5).

5. The device for extracorporeal blood treatment according to claim 1 or 2, It is characterized in that A first section (29A) of the bypass line (29) connects the connection (11) for the inflow of liquid or the inflow line (12) to the inlet (22A) of the cooling device (19), wherein the outlet (22B) of the cooling device (19) is fluidically connected to the outflow (10) for used dialysate or the outflow (31) for coolant via a second section (29B) of the bypass line (29).

6. Apparatus for extracorporeal blood treatment according to any one of claims 1 to 3, It is characterized in that A mechanism (24, 24', 24") is provided for interrupting or adjusting the flow of liquid in the bypass line (23, 29, 32).

7. The device for extracorporeal blood treatment according to claim 6, It is characterized in that The cooling device (19) comprises: a temperature sensor (27) for measuring the temperature of an electrical component (17A, 17B, 17C), the electrical component being in thermal contact with the cooling body (21); and a control unit (25), the control unit controlling a mechanism for interrupting or adjusting the flow of liquid in the bypass line (23, 29, 32) so that the temperature is below a preset limit value.

8. A method for operating an apparatus for extracorporeal blood treatment according to any one of claims 1 to 7, wherein a dialysate is prepared from a liquid supplied to the apparatus for extracorporeal blood treatment, It is characterized in that In order to cool at least one electrical component of the control system, the electrical component is brought into thermal contact with a cooling body which is cooled by means of a liquid intended for preparing the dialysis fluid.

9. The method according to claim 8, It is characterized in that The liquid used to prepare the dialysate is the permeate.

10. The method according to claim 8 or 9, It is characterized in that The temperature of the at least one electrical component is measured and the inflow of liquid supplied to the device for extracorporeal blood treatment is regulated such that the temperature of the at least one electrical component is below a predefined limit value.

11. A method for operating an apparatus for extracorporeal blood treatment according to any one of claims 1 to 7, wherein the apparatus for extracorporeal blood treatment is provided with an operating mode for performing a thermal disinfection of the hydraulic system, wherein a liquid heated to a preset temperature flows through at least a portion of the lines of the hydraulic system, It is characterized in that During the thermal disinfection operating mode, the cooling body is cooled by means of a liquid supplied to the device for extracorporeal blood treatment, while the liquid heated to a preset temperature flows through at least a portion of the lines of the hydraulic system.

12. The method according to claim 11, It is characterized in that The liquid used for thermal disinfection is the penetrant.

13. The method according to claim 11 or 12, It is characterized in that The temperature of the at least one electrical component is measured and the inflow of liquid supplied to the device for extracorporeal blood treatment is regulated such that the temperature of the at least one electrical component is below a predefined limit value.

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