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

Abstract

Extracorporeal blood treatment device comprising a hydraulic system (B) with several lines (7, 9) for supplying 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 port (11) for the inflow of a fluid into the extracorporeal blood treatment device, and the extracorporeal blood treatment device has a cooling device (19) for cooling the at least one electrical component (17A, 17B, 17C) of the control system (15), which has at least one liquid-coolable cooling element (21) which is in thermal contact with the at least one electrical component (17A, 17B, 17C) of the control system (15), wherein the cooling device (19) has at least one inlet (22A) which is in fluid communication with the port (11) for the inflow of a fluid.and has at least one outlet (22B) which is in fluid communication with a drain (10, 31), and wherein the cooling element is designed such that the liquid flows through the cooling element (21) and the thermal contact between the at least one electrical component (17A, 17B, 17C) of the control system (15) and the cooling element (21) is a contact contact, characterized in that the permeate supplied centrally to the device for extracorporeal blood treatment is used as the cooling liquid for the cooling element (21).

Description

[0001] The invention relates to a device for extracorporeal blood treatment comprising a hydraulic system with multiple lines for supplying dialysate to a dialyzer or dialysis treatment, wherein, during treatment, the dialyzer is perfused with dialysate and / or the dialysate is supplied as a substitute to an extracorporeal blood tubing system, and with a control system comprising at least one, usually several, electrical components. Furthermore, the invention relates to a method for operating a device for extracorporeal blood treatment comprising a hydraulic system with multiple lines for supplying dialysate to a dialyzer or dialysis treatment.a dialysis treatment wherein, during the treatment, the dialyzer is perfused with dialysate or the dialysate is supplied as a substitute to an extracorporeal blood tubing system, and which has a control system comprising at least one, normally several, electrical components, wherein the dialysate is produced using a fluid supplied to the device for extracorporeal blood treatment.

[0002] In dialysis, the blood to be treated flows through the blood chamber of a dialyzer in an extracorporeal blood circuit. The dialyzer is divided into a blood chamber and a dialysate chamber by a semipermeable membrane, while dialysate flows through the dialysate chamber of the dialyzer. The extracorporeal blood circuit includes a blood supply line leading to the blood chamber and a blood drainage line leading from the blood chamber. The hydraulic system of the extracorporeal blood treatment device has a line leading to the dialyzer for supplying fresh dialysate and a line leading from the dialyzer for draining used dialysate to a drain. Pumps are provided for circulating the fluids. All components of the extracorporeal blood treatment device are controlled by a control system comprising several electrical components. The control system may consist of one or more modules.This description is exemplary for dialysis. For the purposes of the present invention, the term dialysis also includes the case of hemofiltration in which the dialysate is not supplied to the dialysate chamber, but is supplied as a substitute to the blood supply line and / or the blood drainage line, and fluid is removed via the dialyzer. For the purposes of the present invention, the term dialysis includes all combinations of the aforementioned processes.

[0003] The dialysate can be produced in the dialysis machine from permeate (pure water) and one or more concentrates. Dialysis machines have a water connection for supplying the permeate. The dialysate is processed in the machine's hydraulic system. However, so-called "bedside stations" are also known, representing designs in which the dialysate is supplied to the dialysis machine externally.

[0004] When the terms "water" or "pure water" are used below, they also include dialysate or a rinsing fluid that is supplied to the dialysis machine from the outside or provided within the dialysis machine. "Water" and "pure water" can have the same or different meanings within the context of the present invention. Whether the water can also be pure water is clear to a person skilled in the art from the technical context. In case of doubt, the terms are to be understood as synonyms.

[0005] Dialysis machines are becoming increasingly compact. This development is driven by improved transportability and space savings in confined spaces in hospitals or home dialysis settings. Another trend is the widespread adoption of hot cleaning or hot disinfection processes in dialysis machines, with these processes gaining further importance. These methods, among other things, reduce the use of chemicals. In hot disinfection, permeate heated to a temperature above 80°C and / or permeate containing disinfectants circulates in the hydraulic system. The terms "hot cleaning" and "hot disinfection" are used synonymously in this description unless it is clear from the context that one or the other process is being referred to.

[0006] Disinfection generally also has a cleaning effect, whereas cleaning does not necessarily lead to disinfection. For example, cleaning can be done at a significantly lower temperature than disinfection.

[0007] Thermal management is becoming increasingly challenging for compact dialysis machines. Particularly during hot disinfection, the temperature inside the machine's housing can rise significantly. A high internal temperature is necessary, or at least helpful, for achieving the required temperature for hot disinfection. The air temperature inside the machine can reach 50°C to 65°C.

[0008] The high air temperature poses a problem for the electrical components of the control system, such as power semiconductors or processors. This problem is exacerbated by the fact that in compact dialysis machines, the electronics are located in close proximity to the components of the hydraulic system.

[0009] Many electrical components are only rated for a maximum temperature of 45°C / 50°C. Beyond this temperature, the lifespan of electrical components is significantly reduced. Therefore, adequate cooling of the electrical components is essential. This cooling is generally achieved using the familiar heat sinks on which the components are mounted. However, this cooling method has proven insufficient at the high temperatures found inside the housing.

[0010] State-of-the-art dialysis machines therefore include additional fans that are controlled as needed. These fans can solve the thermal problem. However, the use of fans also has disadvantages.

[0011] First, the fans incur additional manufacturing costs. It should also be considered that the fans have a limited lifespan. Furthermore, the fans increase the amount of dust entering the devices. In addition, they result in a higher noise level. Moreover, air cooling has not always proven practical in countries with very high ambient temperatures.

[0012] A device for extracorporeal blood treatment comprising a hydraulic system with several lines for providing dialysate for dialysis treatment and a control system comprising at least one electrical component according to the preamble of claim 1 and a method for operating such a device for extracorporeal blood treatment according to the preamble of claim 1 is known from DE 10 2010 031 802 A1.

[0013] German patent DE 10 2015 217 281 A1 describes a water treatment system for dialysis treatments, comprising a heat exchanger connected to a buffer tank for storing thermal energy. DE 10 2015 217 281 A1 does not address the problem of cooling electrical components with a liquid.

[0014] The invention is based on the objective of creating a device for extracorporeal blood treatment that avoids the aforementioned disadvantages. In particular, the object of the invention is to provide a device for extracorporeal blood treatment that operates reliably even at high ambient temperatures. A further object of the invention is to provide a method by which a device for extracorporeal blood treatment can be operated without the aforementioned disadvantages.

[0015] The solution to these problems is achieved according to the invention with the features of the independent claims. The dependent claims relate to preferred embodiments of the invention.

[0016] The device for extracorporeal blood treatment according to the invention is a blood treatment device that has a central connection for supplying permeate (pure water) to the machine. The fluid can be used for the production of dialysate or for hot disinfection. Since the fluid is supplied, a sufficient quantity of fluid is available. The temperature of the fluid is largely independent of room temperature and can be set to a predetermined value via the central supply, which can also be below a potentially high room temperature.

[0017] The device includes a cooling unit for cooling at least one of the electrical components of the control system. This unit uses permeate (pure water) supplied centrally to the device to dissipate heat from the electrical components. The cooling unit comprises at least one heat sink that can be cooled by the permeate and is in thermal contact with the at least one electrical component. The cooling unit has at least one inlet connected to a fluid inlet and at least one outlet connected to a fluid drain. The thermal contact is a contact contact.

[0018] The cooling unit can cool individual, multiple, or all thermally stressed electrical components of the extracorporeal blood treatment device. In particular, it can cool individual, multiple, or all thermally stressed electrical components that are specified not to be heated above 45°C or 50°C, or that would be exposed to temperatures exceeding 45°C, 50°C, or 60°C during hot disinfection or hot cleaning if the device were operated without cooling. In this context, "electrical components" refers to all electrical and electronic components of the control system. The "control system" refers to all electronics of the extracorporeal blood treatment device, i.e., all electrical and electronic components, which may also form individual circuits or assemblies. The cooling unit may also include multiple heat sinks.

[0019] The design of the heat sink, which is in thermal contact with the at least one component and cooled by the liquid, is not essential for the invention. What is crucial, however, is that the heat sink is in thermal contact with the liquid so that heat can be dissipated. The heat sink, which is made of a thermally conductive material, for example aluminum, is flushed with the liquid. For example, channels can be formed in the heat sink. The liquid can flow in through one or more inlets and out through one or more outlets. The liquid can then be discarded. The liquid is directed to a drain, which can be an additional drain or the standard drain for used dialysate found in a dialysis machine.

[0020] In the inventive method, the cooling of the at least one cooling element with the liquid takes place during an operating mode of the extracorporeal blood treatment device in which the thermal load is highest. This operating mode is the hot disinfection of the hydraulic system, in which liquid heated to a predetermined temperature flows through at least a portion of the hydraulic system's lines. The invention advantageously utilizes the fact that, in the dialysis machine, the inlet section for the central fluid supply with a liquid, in particular permeate, is regularly not included in the hot disinfection circulation. Consequently, the cooling device can be connected in the inlet section or in a bypass line fluidically connected to the inlet section, which may be connected to the outlet. The cooling device can therefore be operated independently of the hot disinfection.Such an arrangement in the inlet section can additionally achieve the effect that the waste heat from the electrical component warms the coolant, which is then at least partially or completely directed into the hydraulic system and therefore does not need to be heated as much there, whether for treatment or hot disinfection. This can result in energy savings.

[0021] A preferred embodiment provides that the hydraulic system includes a fluid conditioning unit with an inlet, wherein the connection for the inflow of a fluid via an inlet line is connected to the inlet of the fluid conditioning unit. This inlet line forms the supply path for the central fluid supply. The fluid can be dialysate, and the fluid conditioning unit is a dialysate conditioning unit.

[0022] In this context, a liquid preparation unit encompasses all components of the dialysis machine that serve to process a liquid, for example, by producing, heating, or degassing the dialysate. The liquid preparation unit may include, for example, an inlet chamber for collecting the liquid, a degassing chamber, a heating device, etc.

[0023] If the fluid treatment device has an inlet chamber for collecting a fluid, the inlet of the fluid treatment device can be an inlet of the inlet chamber. Consequently, the inlet path comprises only the area upstream of the inlet chamber, so that if the supply of fluid to the inlet chamber is interrupted or regulated, hot disinfection of the hydraulic system can take place independently of the supply of fluid to the cooling device. In a particularly preferred embodiment, means for interrupting or regulating the fluid flow are provided in the inlet line.

[0024] Different designs feature different configurations for integrating the cooling device into the existing liquid system of the dialysis machine.

[0025] In a first embodiment, the supply line has a first section that connects the inlet for the liquid to the inlet of the cooling device and a second section that connects the outlet of the cooling device to the inlet of the liquid treatment device. The cooling device is thus integrated into the supply line. During hot disinfection, the supply of liquid to the hydraulic system can be interrupted so that the liquid flows only to the cooling device. The outlet of the cooling device can be connected via a bypass line to a drain, which may be an additional drain or an existing drain of the dialysis machine. Means, which may be valves or throttles, are provided to interrupt or regulate the liquid flow in the bypass line.The means of interruption can also include pumps or combinations of different means mentioned.

[0026] A particularly preferred embodiment provides that the cooling device includes a temperature sensor for measuring the temperature of an electrical component that is in thermal contact with the heat sink, and a control unit that controls the means for interrupting or regulating the fluid flow in the bypass line such that the temperature remains below a predetermined limit. The control unit of the cooling device can also be part of the central control and computing unit of the extracorporeal blood treatment device.

[0027] In a further embodiment, a first section of an additional coolant line connects the liquid inlet or the supply line to the inlet of the cooling device, with the outlet of the cooling device being connected via a second section of the coolant line to a drain, which can again be an additional drain or an existing drain of the dialysis machine. The coolant line preferably includes means for interrupting or regulating the liquid flow. The coolant line thus again constitutes a bypass line. In this embodiment as well, the regulation of the liquid flow can be dependent on the temperature of the at least one component.

[0028] In another alternative embodiment, a first section of a flushing fluid line branches off from the inlet line and leads to the inlet of the cooling unit, with the outlet of the cooling unit being connected to a drain via a second section of the flushing fluid line. Such a flushing fluid line may already be present in a dialysis machine for flushing and / or disinfecting the inlet section with a fluid. This line is then used both for flushing and / or disinfecting the inlet section and for supplying the fluid to the cooling unit. The flushing fluid line thus again acts as a bypass line. Temperature control can also be implemented here.

[0029] Instead of temperature control of the shut-off devices or valves in the pipelines, the shut-off devices or valves can also be time-controlled. For example, the control unit can fully or partially open or close the shut-off devices or valves for predetermined time intervals.

[0030] The invention will now be described in detail with reference to the drawings.

[0031] They show: Fig. 1 A first embodiment of the blood treatment device according to the invention with a cooling device in a highly simplified schematic representation, Fig. 2 a second embodiment of the blood treatment device according to the invention, Fig. 3 a third embodiment of the blood treatment device according to the invention and Fig. 4 a fourth embodiment of the blood treatment device according to the invention.

[0032] Fig. Figure 1 shows a simplified schematic representation of an embodiment of the blood treatment device according to the invention. The blood treatment device comprises an extracorporeal blood circuit A, shown only in outline, and a hydraulic system B. The extracorporeal blood circuit A includes the blood chamber 1, and the hydraulic system B includes the 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. For the provision of the dialysate, the hydraulic system B has a fluid preparation unit 5, in particular a dialysate preparation unit, which has an inlet 5A for a fluid for the production of the dialysate, in particular permeate (pure water), and an outlet 5B. The permeate can be collected in an inlet chamber 6. To produce the dialysate, the permeate is mixed with one or more concentrates.The remaining components 5C of the dialysate processing unit 5 are in . Fig. Figure 1 is shown schematically only. A dialysate supply line 7 leads from the outlet 5B of the dialysate preparation unit 5 to the inlet 2A of the dialysate chamber 2 of the dialyzer 3. The dialysate is pumped by a dialysate pump 8. The outlet 2B of the dialysate chamber 2 is connected via a dialysate discharge line 9 to a drain 10 for used dialysate.

[0033] This description pertains to a phase during patient treatment. During preparation or follow-up of the treatment, the device does not need to include the components of the extracorporeal blood circuit A and the dialyzer 3, or the dialysate supply line 7 can be bypassed with the dialysate discharge line 9, thus circumventing the dialyzer 3. Furthermore, the device may have disinfectant concentrate connections. Concentrated disinfectant can be supplied to the hydraulic system B via these connections and, by mixing it with water supplied to the hydraulic system B via an inlet 14, the desired disinfectant concentration can be achieved within the hydraulic system B.

[0034] The permeate is fed to the blood treatment device at a central port 11, which is connected via a supply line 12 to the inlet 6A of the inlet chamber 6 of the dialysate preparation unit 5. An inlet valve 13 is provided at the inlet 6A of the inlet chamber 6, so that the hydraulic system B can be isolated from the supply line 14.

[0035] In Fig. Figure 1 shows only the components of the hydraulic system B that are essential for the invention. The hydraulic system B can also include further components 30, for example a balancing unit.

[0036] Furthermore, the blood treatment device has a control system 15 that can include several circuits with electrical components. In Fig. Figure 1 shows only a circuit 16 with several components 17A, 17B, 17C.

[0037] The blood treatment device includes an operating mode for hot disinfection of the hydraulic system B, in which the hydraulic system is flushed with the fluid supplied to the blood treatment device at the central port 11. For this purpose, the fluid, in particular permeate, is heated to a temperature greater than 80°C. During hot disinfection, the air temperature inside the housing 18 of the blood treatment device rises, resulting in thermal stress on the electrical components 17A, 17B, and 17C.

[0038] A cooling device 19 is provided for cooling the electrical components 17A, 17B, 17C, and is described below for one embodiment. The electrical components 17A, 17B, 17C are located on a circuit board 20, which is mounted on a heat sink 21, so that the components are in thermal contact with the heat sink. The heat sink 21 has one or more channels 22, each with an inlet 22A and an outlet 22B, allowing a liquid to flow through the heat sink to dissipate heat. The permeate supplied centrally to the machine is used as the cooling liquid for the heat sink.

[0039] In the present embodiment, the heat sink 21 is connected to the inlet line 12. The inlet line 12 comprises a first section 12A, which connects the port 11 to the inlet 22A of the heat sink 21, and a second section 22B, which connects the outlet 22B of the heat sink 21 to the inlet 6A of the inlet chamber 6. A bypass line 23 branches off from the second section 12B of the inlet line 12 and leads to the outlet 10. A bypass valve 24 is provided in the bypass line 23.

[0040] During hot disinfection, the inlet valve 13 at the inlet chamber 6 can remain closed, at least temporarily, so that the hydraulic system B is isolated from the supply line 14. The bypass valve 24 in the bypass line 23 is opened, allowing cold permeate to flow into the cooling element 21 for heat dissipation. The permeate then flows into the drain 10.

[0041] In one embodiment, the cooling device 19 can include a control unit 25 to control the fluid flow. This control unit 25 can be part of the control and computing unit of the blood treatment device, i.e., part of the control system. The control unit 25 is connected via a measuring line 26 to a temperature sensor 27, which measures the temperature of an electrical component 17C of the electrical circuit 16, and is connected via control lines 28 to the inlet valve 13 and the bypass valve 24. The control unit 25 compares the temperature measured by the temperature sensor 27 with a predetermined limit value, which is below the permissible operating temperature of the component. If the temperature is above the limit value, the control unit 25 opens the bypass valve 24, allowing permeate to flow through the heat sink 21 for heat dissipation.If the temperature falls below the limit value, the control unit 25 closes the bypass valve 24, thus interrupting the fluid flow. Instead of a valve, a throttle can also be provided in the bypass line 23, which specifies a certain flow rate. The control unit 25 can also regulate the fluid flow into the hydraulic system B by only partially opening and closing the inlet valve 13. The control unit 25 can also control the fluid flow in the supply line 12 such that fluid primarily flows into the hydraulic system B when such a flow is requested by a hydraulic controller. If this flow is insufficient for cooling, the control unit 25 can, as a secondary measure, initiate flow via the bypass line 23, for example, by opening valve 24.

[0042] In all embodiments described here, the device may include a pump (not shown in the figures) for pumping the liquid through the bypass line. This pump may be a peristaltic pump or a diaphragm pump. In this case, valve 24 may be either the peristaltic pump or the diaphragm pump.

[0043] Fig. Figure 2 shows a second embodiment of the blood treatment device, which differs from the first embodiment by the integration of the cooling device 19. The corresponding parts are provided with the same reference numerals. In the second embodiment, the cooling element 21 is not connected to the inlet line 12. A first section 29A of an additional coolant line 29 branches off from the inlet line 12 and leads to the inlet of the cooling element 21. A second section 29B of the coolant line 29 connects the outlet 22A of the cooling element 21 to the drain 10. A valve 24' is provided in the second section 29B of the coolant line 29 to regulate the coolant flow. The valve 24' in the coolant line 29 can be controlled by the control unit 25, like the bypass valve 24 in the bypass line 23 of the first embodiment, depending on the temperature measured by the temperature sensor 27.

[0044] The Fig. Figure 3 shows a third embodiment of the blood treatment device, which differs from the second embodiment in that the valve 24'' for controlling the fluid flow is not located in the second section 29B, but in the first section 29A of the coolant line. The fluid flow can be controlled as in the second embodiment. Furthermore, the third embodiment differs from the second embodiment in that the second section 29B of the coolant line 29 does not lead to the drain for used dialysate, but to an additional drain 31 for the coolant. However, the second section 29B of the coolant line 29 can also be connected to the drain 10 for used dialysate in the third embodiment. Fig. 1 and Fig. 2) The third embodiment with the separate drain 31 for the coolant has the advantage that contamination of the inlet section 14 by used dialysate from the outlet 10 is excluded.

[0045] Fig.Figure 4 shows a further alternative embodiment of a blood treatment device that provides for flushing or disinfection of the inlet section 14. For flushing or disinfection, such a blood treatment device has a flushing fluid line 32, which branches off from the inlet line 12 upstream of the inlet 5A of the dialysate preparation unit 5, particularly at the end of the inlet section 14, for example upstream of the inlet valve 13 and preferably near the inlet valve 13, and leads to a separate outlet 31. In this alternative embodiment, the cooling element 21 is connected in the flushing fluid line 32. The flushing fluid line 32 comprises a first section 32A, which branches off from the inlet line 12 and leads to the inlet 22A of the heat sink 21, and a second section 32B, which connects the outlet 22B of the heat sink 21 to the separate drain 31.The valve 24''' for regulating the coolant flow can be provided in the second section 32B of the flushing fluid line 32. In this embodiment, an existing line, otherwise used for supplying flushing fluid, is used to supply the coolant. The control of the valves 13 and 24''' can be carried out as in the embodiments described above.

Claims

[1] Extracorporeal blood treatment device comprising a hydraulic system (B) with several lines (7, 9) for supplying 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 port (11) for the inflow of a fluid into the extracorporeal blood treatment device, and the extracorporeal blood treatment device has a cooling device (19) for cooling the at least one electrical component (17A, 17B, 17C) of the control system (15), which has at least one liquid-coolable cooling element (21) which is in thermal contact with the at least one electrical component (17A, 17B, 17C) of the control system (15), wherein the cooling device (19) has at least one inlet (22A) which is in fluid communication with the port (11) for the inflow of a fluid,and has at least one outlet (22B) which is in fluid communication with a drain (10, 31), and wherein the heat sink is designed such that the liquid flows through the heat sink (21) and the thermal contact between the at least one electrical component (17A, 17B, 17C) of the control system (15) and the heat sink (21) is a touch contact, , characterized by , that the permeate supplied centrally to the device for extracorporeal blood treatment is used as the cooling liquid for the cooling element (21). [2] Device for extracorporeal blood treatment according to claim 1, characterized by, that the hydraulic system (B) has a fluid treatment device (5) with an inlet (5A), wherein the connection (11) for the inflow of a fluid via an inlet line (12) is connected to the inlet (5A) of the fluid treatment device (5), and wherein a bypass line (23, 29, 32) extends from the inlet line (12) and is in fluid communication with the outlet (10, 31). [3] Device for extracorporeal blood treatment according to claim 2, characterized by , that the liquid preparation device (5) has an inlet chamber (6) for collecting a liquid, wherein the inlet (5A) of the liquid preparation device (5) is an inlet (6A) of the inlet chamber (6). [4] Device for extracorporeal blood treatment according to claim 2 or 3, characterized by, that means (13) are provided for interrupting or regulating the fluid flow in the inflow line (12) downstream of the branch of the bypass line (23, 29, 32) from the inflow line (12). [5] Device for extracorporeal blood treatment according to claims 2 to 4, characterized by , that the inlet line (12) has a first section (12A) which connects the connection (11) for the inlet of a liquid to the inlet (22A) of the cooling device (19) and has a second section (12B) which connects the outlet (22B) of the cooling device (19) to the inlet (5A) of the liquid treatment device (5). [6] Device for extracorporeal blood treatment according to claim 2 or 3, characterized by, that a first section (29A) of the bypass line (29) connects the connection (11) for the inlet of liquid or the inlet line (12) to the inlet (22A) of the cooling device (19), wherein the outlet (22B) of the cooling device (19) is in fluid communication via a second section (29B) of the bypass line (29) to an outlet (10, 31). [7] Device for extracorporeal blood treatment according to any one of claims 2 to 6, characterized by , that means (24, 24', 24") are provided for interrupting or regulating the fluid flow in the bypass line (23, 29, 32). [8] Device for extracorporeal blood treatment according to claim 7, characterized by, that the cooling device (19) has a temperature sensor (27) for measuring the temperature of an electrical component (17A, 17B, 17C) which is in thermal contact with the heat sink (21), and a control unit (25) which controls the means (24, 24', 24") for interrupting or regulating the fluid flow in the bypass line (23, 29, 32) such that the temperature is below a predetermined limit. [9] Device for extracorporeal blood treatment according to any one of claims 1 to 8, characterized by that the flow (31) is independent of a further flow (10) for the hydraulic system (B), in particular a flow for dialysate during treatment. [10] Method for operating an extracorporeal blood treatment device comprising a hydraulic system with multiple lines for supplying dialysate to a dialyzer and a control system comprising at least one electrical component, wherein the dialysate is produced using a liquid supplied to the extracorporeal blood treatment device and, for cooling the at least one electrical component of the control system, the at least one electrical component is brought into thermal contact with a heat sink which is cooled by the liquid intended for the production of the dialysate, wherein the heat sink is permeated by the liquid and the thermal contact between the at least one electrical component and the heat sink is a contact contact, characterized by, that the device for extracorporeal blood treatment provides an operating mode for carrying out hot disinfection of the hydraulic system, in which a liquid heated to a predetermined temperature flows through at least part of the lines of the hydraulic system, and the cooling element is cooled with the liquid intended for the production of the dialysate during the hot disinfection operating mode, while the liquid heated to a predetermined temperature flows through at least part of the lines of the hydraulic system. [11] Method according to claim 10, characterized by , that the temperature of at least one electrical component of the control system is measured, and the flow of the liquid intended for the production of the dialysate is regulated in such a way that the temperature of at least one electrical component is below a predetermined limit.

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