Connecting device and dialysis device

Abstract

The embodiment of the utility model discloses a connecting device and a dialysis device. The connecting device comprises a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a first valve and a second valve, the first pipeline communicates with a liquid supply system; three ports of the first valve are respectively connected with a first pipeline, a second pipeline and a third pipeline; three ports of the second valve are respectively connected with a second pipeline, a fourth pipeline and a fifth pipeline; when the first valve controls the second pipeline to be communicated with the first pipeline, the second valve is used for controlling the second pipeline to be selectively communicated with the fourth pipeline or the fifth pipeline; when the first valve controls the second pipeline to be communicated with the third pipeline, the second valve is used for controlling the second pipeline to be communicated with the fourth pipeline. According to the application, dead-space-free disinfection on the connecting device can be realized, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a connecting device and a dialysis device. Background Art

[0002] In order to reduce the workload of medical staff and improve the treatment environment for patients, many hospitals use centralized fluid supply systems for centralized preparation, filtration and storage of dialysis fluid. Using a centralized fluid supply system for fluid supply can reduce the transportation cost of dialysis fluid and the labor cost of preparation, and solve the problem of bacterial control of dialysis concentrated B solution. Under the centralized fluid supply mode, the pipeline paths of dialysis mode and disinfection mode are different, and the disinfection frequency is also different. The centralized fluid supply system is generally emptied and cleaned every day, while the hemodialysis machine must be disinfected after each use. In addition, the pipe pressure during cleaning and disinfection is much higher than the pipe pressure during dialysis. Therefore, the pipeline between the hemodialysis machine and the centralized fluid supply system must be connected during dialysis and disconnected during cleaning and disinfection to ensure the safety of the clinical application of the dialysis machine.

[0003] However, the joint part where the centralized liquid supply system is connected to the hemodialysis machine becomes a disinfection blind spot, which may become a safety hazard. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, one purpose of the present invention is to provide a connection device that achieves dead-space-free disinfection between a liquid supply system and a dialysis machine, thereby improving safety.

[0005] The utility model also provides a dialysis device.

[0006] According to an embodiment of the present utility model, the connecting device includes: a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a first valve and a second valve; the first pipeline is connected to the liquid supply system for liquid intake; the first valve has three ports, and the three ports of the first valve are respectively connected to the first pipeline, the second pipeline and the third pipeline, and the third pipeline is used to connect to the return liquid port of the dialysis machine; the second valve has three ports, and the three ports of the second valve are respectively connected to the second pipeline, the fourth pipeline and the fifth pipeline, the fourth pipeline is used to connect to the suction port of the dialysis machine, and the fifth pipeline is used to connect to the waste liquid treatment device; wherein, when the first valve controls the second pipeline to be connected to the first pipeline, the second valve is used to control the second pipeline to be connected to the fourth pipeline or the fifth pipeline selectively; when the first valve controls the second pipeline to be connected to the third pipeline, the second valve is used to control the second pipeline to be connected to the fourth pipeline.

[0007] Preferably, a third valve is provided on the first pipeline, the third valve has three ports, and the three ports of the third valve are respectively connected to the liquid supply system, the first pipeline and the waste liquid treatment device.

[0008] Preferably, a liquid leakage detection component is provided between the second valve and the waste liquid treatment device, and / or a liquid leakage detection component is provided between the third valve and the waste liquid treatment device.

[0009] Preferably, the liquid leakage detection component includes a liquid leakage detection device and two liquid leakage detection branches, one end of one of the liquid leakage detection branch pipes is connected to the second valve; one end of the other liquid leakage detection branch pipe is used to connect to the third valve, and the other ends of the two liquid leakage detection branch pipes are connected to the waste liquid treatment device; the liquid leakage detection device is connected between the two liquid leakage detection devices.

[0010] Preferably, a check valve is provided between the third valve and the waste liquid treatment device.

[0011] Preferably, a check valve is provided between the second valve and the waste liquid detection device.

[0012] Preferably, the check valve is configured to open automatically when the medium enters.

[0013] The dialysis device according to an embodiment of the present invention includes: a liquid supply system, a U-shaped three-way valve, a dialysis machine, and a connecting device according to an embodiment of the present invention, wherein the liquid supply system includes a liquid supply pipeline and a liquid return pipeline; the U-shaped three-way valve has three ports, and the three ports of the U-shaped three-way valve are respectively connected to the liquid outlet of the liquid supply pipeline, the connecting device and the liquid return port of the liquid return pipeline; the liquid inlet of the liquid supply pipeline is connected to the liquid outlet of the liquid return pipeline; the dialysis machine has a liquid suction port and a liquid return port, the liquid suction port is connected to the fourth pipeline of the connecting device, and the liquid return port is connected to the third pipeline of the connecting device.

[0014] Preferably, a switch valve is provided on the liquid return pipeline, and the switch valve is used to control the on or off of the liquid return pipeline; a pressure detection device is provided on the liquid return pipeline, and is used to detect the pressure in the liquid supply pipeline.

[0015] Preferably, the liquid supply system further includes a liquid storage component, which is used to store the medium, the liquid outlet of the return liquid pipeline is connected to the liquid inlet of the liquid storage component, and the liquid inlet of the liquid supply pipeline is connected to the liquid outlet of the liquid storage component.

[0016] Combined with the technical solution, it can be seen that the embodiments provided by the present invention have the following advantages: The first valve and the second valve are used to connect different pipelines, respectively, thereby increasing the connectivity of the connection device and increasing the number of communication paths for the first, second, and fifth pipelines. This allows for disinfection and cleaning of the communication paths between the liquid supply system and the dialysis machine, reducing blind spots in the disinfection of the connection device and improving the safety of the connection device. Furthermore, by providing the first valve, the dialysis machine does not need to be plugged in or out before and after use. By controlling the first valve, the plugging and unplugging work of medical personnel can be replaced, reducing the impact of plugging and unplugging operations on the dialysis machine during dialysis, further improving safety and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 1 is a schematic structural diagram of a dialysis device according to an embodiment of the present utility model;

[0019] Figure 2 is a schematic structural diagram of a dialysis device according to an embodiment of the present utility model, wherein the connecting device is in a connected state;

[0020] Figure 3 is a schematic structural diagram of a dialysis device according to an embodiment of the present invention, wherein the connecting device is in a sterilized state;

[0021] Figure 4 Schematic diagram of the structure of the dialysis device according to an embodiment of the present invention, wherein the connecting device is in the dialysis machine circulation state;

[0022] Reference numerals:

[0023] Dialysis device 1000;

[0024] Connecting device 100, liquid supply system 200, dialysis machine 300;

[0025] First pipeline 1;

[0026] Second pipeline 2;

[0027] The third pipeline 3;

[0028] Fourth pipeline 4;

[0029] Fifth pipeline 5;

[0030] Liquid leakage detection assembly 6, liquid leakage detection device 61, liquid leakage detection branch pipe 62;

[0031] U-shaped three-way valve 7;

[0032] Liquid supply pipeline 81, liquid storage assembly 82, liquid return pipeline 83;

[0033] Pressure detection device 9;

[0034] First valve V1, second valve V2, third valve V3, check valve ZV, on-off valve SV5. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] Reference below Figure 1-Figure 4 A connection device 100 and a dialysis device 1000 according to an embodiment of the present invention are described.

[0039] like Figure 1As shown, the connecting device 100 according to an embodiment of the present invention includes a first pipeline 1, a second pipeline 2, a third pipeline 3, a fourth pipeline 4, a fifth pipeline 5, a first valve V1 and a second valve V2; the first pipeline 1 can be connected to the liquid supply system 200, and the liquid in the liquid supply system 200 enters the connecting device 100 through the first pipeline 1; the first valve V1 has three ports, and one port of the first valve V1 is connected to the first pipeline 1, another port of the first valve V1 is connected to the second pipeline 2, and another port of the first valve V1 is connected to the third pipeline 3, and the third pipeline 3 can be connected to the liquid return port of the dialysis machine 300.

[0040] The second valve V2 has three ports, and one port of the second valve V2 can be connected to the second pipeline 2, another port of the second valve V2 can be connected to the fourth pipeline 4, and another port of the second valve V2 can be connected to the fifth pipeline 5. The fourth pipeline 4 can be connected to the liquid suction port of the dialysis machine 300, and the fifth pipeline 5 can be connected to the waste liquid treatment device.

[0041] When the first valve V1 controls the second pipeline 2 to be connected to the first pipeline 1, the second valve V2 can control the second pipeline 2 to be connected to either the fourth pipeline 4 or the fifth pipeline 5.

[0042] When the first valve V1 controls the second pipeline 2 to be connected to the third pipeline 3 , the second valve V2 is used to control the second pipeline 2 to be connected to the fourth pipeline 4 .

[0043] Here, the pipelines are selectively connected. A pipeline connects two other components through a valve, allowing it to connect to one component but not the other. For example, the second pipeline 2 can connect to the fourth pipeline 4 without connecting to the fifth pipeline 5; or the second pipeline 2 can connect to the fifth pipeline 5 without connecting to the fourth pipeline 4.

[0044] Therefore, the connection device 100 has three connection states, namely, a connection state, a disinfection state, and a dialysis machine 300 circulation state.

[0045] For example, Figure 2 As shown, when the connecting device 100 is in the connected state, the first pipeline 1 and the second pipeline 2 are connected through the first valve V1, and the second pipeline 2 and the fourth pipeline 4 are connected through the second valve V2. The dialysate in the liquid supply system 200 passes through the first pipeline 1, the second pipeline 2 and the fourth pipeline 4 in sequence, and then flows to the liquid suction port of the dialysis machine 300. The liquid supply system 200 can supply liquid to the dialysis machine 300.

[0046] For example, Figure 3As shown, when the connection device 100 is in the disinfection state, the first pipeline 1 and the second pipeline 2 are connected through the first valve V1, and the second pipeline 2 and the fifth pipeline 5 are connected through the second valve V2. The liquid supply system disinfectant in the liquid supply system 200 passes through the first pipeline 1, the second pipeline 2, and the fifth pipeline 5 in sequence before flowing to the waste liquid treatment device. Thus, the liquid supply system disinfectant in the liquid supply system 200 can disinfect the connection device 100.

[0047] For example, Figure 4 As shown, when the connecting device 100 is in the dialyzer circulation state, the third pipeline 3 and the second pipeline 2 are connected through the first valve V1, and the second pipeline 2 and the fourth pipeline 4 are connected through the second valve V2. The dialyzer disinfectant in the dialyzer 300 passes through the third pipeline 3, the second pipeline 2 and the fourth pipeline 4 in sequence. After the dialyzer 300 suction port connects the dialyzer disinfectant to the dialyzer 300 return port, the disinfection of the dialyzer 300 is completed. The dialyzer 300 can also enter the dialyzer 300 suction port again from the dialyzer 300 return port through the connecting device 100, thereby realizing the circulation of the dialyzer disinfectant in the dialyzer 300.

[0048] It should be further explained that when first valve V1 connects third pipeline 3 and second pipeline 2, the liquid circulation paths in liquid supply system 200 and dialyzer 300 are independent and can be disinfected simultaneously. Dialyzer disinfectant flows through the dialyzer disinfection path, and the liquid supply system disinfectant flows through the liquid supply system disinfection path, which can then flow to connecting device 100.

[0049] Compared to related technologies, the first valve V1 and the second valve V2 connect different pipelines, increasing the connectivity of the connection device 100 and increasing the communication paths of the first pipeline 1, the second pipeline 2, and the fifth pipeline 5. This allows for disinfection and cleaning of the communication paths between the liquid supply system 200 and the dialysis machine 300, reducing blind spots in the disinfection of the connection device 100 and improving the safety of the connection device 100. Furthermore, the provision of the first valve V1 eliminates the need to plug and unplug the dialysis machine 300 before and after use. By controlling the first valve V1, medical personnel can perform plugging and unplugging tasks, reducing the impact of plugging and unplugging operations on the dialysis machine 300 during dialysis, further improving safety and convenience.

[0050] like Figure 1As shown, in some embodiments, a third valve V3 is provided on the first pipeline 1. The third valve V3 has three ports, and the three ports of the third valve V3 are respectively connected to the liquid supply system 200, the first pipeline 1, and the waste liquid treatment device. The third valve V3 can connect or disconnect the liquid supply system 200 and the connecting device 100, allowing the liquid supply device and the connecting device 100 to be used and operated independently. If the dialysate in the liquid supply system 200 does not meet the standards, the dialysate can be directly discharged through the third valve V3 without entering the connecting device 100. In subsequent disinfection, only the liquid supply system 200 can be disinfected without disinfecting the connecting device 100. Therefore, the provision of the third valve V3 can improve the safety of the connecting device 100.

[0051] like Figure 1 As shown, in some embodiments, a leakage detection assembly 6 is provided between the second valve V2 and the waste liquid treatment device, and / or a leakage detection assembly 6 is provided between the third valve V3 and the waste liquid treatment device. The leakage detection assembly 6 can promptly detect the sealing of the valves and discharge the leaked liquid through the waste liquid treatment device, thereby improving the safety of the connection device 100.

[0052] The first valve V1 and the third valve V3 are redundant. When the first valve V1 leaks, the third valve V3 prevents the leaked liquid from flowing through the liquid supply system to prevent contamination. When the third valve V3 leaks, the first valve V1 prevents the leaked liquid from flowing through the dialysis machine to prevent contamination. Furthermore, the first valve V1 prevents disinfectant from entering the other system during disinfection of the liquid supply system and the dialysis machine, causing contamination. For example, when the dialysis machine 300 is not in operation and the third valve V3 leaks, liquid can flow into the waste liquid treatment device. If the liquid supply system 200 is being disinfected, the first valve V1 prevents the disinfectant from entering the dialysis machine 300 and causing contamination. When the hemodialysis machine is performing dialysis, if the third valve V3 or the second valve V2 leaks, some liquid flows into the waste liquid treatment device. During disinfection of the hemodialysis machine, if the first valve V1 leaks, some liquid flows into the waste liquid treatment device through the third valve V3 and some liquid flows into the waste liquid treatment device through the second valve V2. The third valve V3 prevents the disinfectant from entering the liquid supply system 200 and causing contamination of the dialysate. The liquid leakage detection component 6 will promptly alarm after detecting the leakage.

[0053] like Figure 1 As shown, in some embodiments, the leakage detection assembly 6 includes a leakage detection device 61 and two leakage detection branch pipes 62. One end of one leakage detection branch pipe 62 is connected to the second valve V2; one end of the other leakage detection branch pipe 62 is used to connect to the third valve V3. The other ends of both leakage detection branch pipes 62 are connected to a waste liquid treatment device. The leakage detection device 61 is connected between the two leakage detection devices 61. This can reduce the number of leakage detection devices 61, reduce costs, and improve utilization.

[0054] like Figure 1 As shown, in some embodiments, a check valve ZV is provided between the third valve V3 and the waste liquid detection device. By providing the check valve ZV, backflow of liquid in the waste liquid treatment device can be avoided, thereby improving the safety of the connecting device 100.

[0055] like Figure 1 As shown, in some embodiments, a check valve ZV is provided between the second valve V2 and the waste liquid detection device. By providing the check valve ZV, backflow of liquid in the waste liquid treatment device can be avoided, thereby improving the safety of the connecting device 100.

[0056] like Figure 1 As shown, in some embodiments, the check valve ZV is configured to open automatically when the medium enters, which can further improve the safety of the connecting device 100.

[0057] like Figure 1 As shown, a dialysis device 1000 according to an embodiment of the present invention includes a liquid supply system 200, a U-shaped three-way valve 7, a dialysis machine 300, and a connecting device 100 according to an embodiment of the present invention. The liquid supply system 200 includes a liquid supply line 81 and a liquid return line 83; the U-shaped three-way valve 7 has three ports, and the three ports of the U-shaped three-way valve 7 are respectively connected to the liquid outlet of the liquid supply line 81, the connecting device 100, and the liquid return line 83; the liquid inlet of the liquid supply line 81 is connected to the liquid outlet of the liquid return line 83; the dialysis machine has a liquid suction port and a liquid return port, the liquid suction port is connected to the fourth passage 4 of the connecting device 100, and the liquid return port is connected to the third passage 3 of the connecting device 100.

[0058] The connection device 100 can block the liquid supply line 81 of the liquid supply system 200 from supplying liquid to the dialyzer 300, thereby allowing the liquid supply system 200 and the dialyzer 300 to be disinfected independently. By providing a return line 83, the disinfectant can be recirculated into the liquid supply line 81, improving the safety of the liquid supply system 200.

[0059] like Figure 1As shown, in some embodiments, a switch valve SV5 is provided on the liquid return line 83, which can control whether the liquid return line 83 is open or closed. A pressure detection device 9 is provided on the liquid return line 83 for detecting the pressure in the liquid return line 83. Specifically, when the switch valve SV5 is closed, the liquid supply system 200 applies pressure to the liquid supply line 81, closes the third valve V3 to disconnect the liquid supply system 200 from the connecting device 100, and applies pressure from the liquid supply line 81 to the liquid return line 83. If the pressure of the pressure detection device 9 decreases, it indicates that there is a pressure leak in the third valve V3. If the pressure of the pressure detection device 9 remains unchanged, there is no pressure leak in the third valve V3. Then, the third valve V3 is opened to connect the liquid supply system 200 with the connecting device 100, and the second valve V2 is closed to disconnect the connecting device 100 from the dialysis machine 300. If the pressure of the pressure detection device 9 decreases, it indicates that there is a pressure leak in the second valve V2. If the pressure of the pressure detection device 9 remains unchanged, there is no pressure leak in the second valve V2.

[0060] like Figure 1 As shown, in some embodiments, the liquid supply system 200 further includes a liquid storage assembly 82, which is used to store a medium. The liquid outlet of the liquid return line 83 is connected to the liquid inlet of the liquid storage assembly 82, and the liquid inlet of the liquid supply line 81 is connected to the liquid outlet of the liquid storage assembly 82. The dialysate and disinfectant can be configured and stored in the liquid storage assembly 82 to improve safety.

[0061] In some specific examples, the liquid supply system 200 further includes a liquid dispensing assembly, with an on-off valve disposed between the liquid dispensing assembly and the liquid storage assembly. Disinfectant is prepared in the liquid dispensing assembly and can flow sequentially through the liquid dispensing assembly, the liquid storage assembly, and the connecting device to achieve full-line disinfection. Dialysis fluid can also flow sequentially through the liquid dispensing assembly, the liquid storage assembly, the connecting device, and the dialysis machine.

[0062] Furthermore, the dialysis device 1000 has different piping paths in dialysis mode and disinfection mode. Different piping paths also require different disinfection frequencies. The fluid supply system 200 typically needs to be emptied and cleaned daily, while the dialysis machine 300 must be disinfected after each use. Furthermore, the line pressure during cleaning and disinfection of the dialysis machine 300 is much higher than during dialysis. Therefore, the connection device 100 allows the dialysis machine 300 to be connected to the fluid supply system 200 during dialysis and disconnected during cleaning and disinfection.

[0063] The other components and operations of the dialysis device 1000 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of these features. The vertical, horizontal, and front-to-back directions are based on the vertical, horizontal, and front-to-back directions shown in the figure.

[0064] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature therebetween. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0065] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A connecting device, characterized in that: include: A first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a first valve, and a second valve; The first pipeline is connected to the liquid supply system for liquid intake; The first valve has three ports, and the three ports of the first valve are respectively connected to the first pipeline, the second pipeline and the third pipeline, and the third pipeline is used to connect to the liquid return port of the dialysis machine; The second valve has three ports, and the three ports of the second valve are respectively connected to the second pipeline, the fourth pipeline and the fifth pipeline, the fourth pipeline is used to connect to the liquid suction port of the dialysis machine, and the fifth pipeline is used to connect to the waste liquid treatment device; Wherein, when the first valve controls the second pipeline to be connected to the first pipeline, the second valve is used to control the second pipeline to be connected to the fourth pipeline or the fifth pipeline selectively; When the first valve controls the second pipeline to be connected to the third pipeline, the second valve is used to control the second pipeline to be connected to the fourth pipeline.

2. The connecting device according to claim 1, characterized in that A third valve is provided on the first pipeline. The third valve has three ports, and the three ports of the third valve are respectively connected to the liquid supply system, the first pipeline and the waste liquid treatment device.

3. The connection device according to claim 2, characterized in that A liquid leakage detection component is provided between the second valve and the waste liquid treatment device, and / or, A liquid leakage detection component is provided between the third valve and the waste liquid treatment device.

4. The connection device according to claim 3, characterized in that The liquid leakage detection assembly includes a liquid leakage detection device and two liquid leakage detection branch pipes, one end of one of the liquid leakage detection branch pipes is connected to the second valve; one end of the other liquid leakage detection branch pipe is used to connect to the third valve, and the other ends of the two liquid leakage detection branch pipes are connected to the waste liquid treatment device; The liquid leakage detection device is connected between the two liquid leakage detection devices.

5. The connecting device according to claim 2, characterized in that A check valve is provided between the third valve and the waste liquid treatment device.

6. The connection device according to claim 1, characterized in that A check valve is provided between the second valve and the waste liquid detection device.

7. The connecting device according to any one of claims 5 or 6, characterized in that: The check valve is configured to open automatically when the medium enters.

8. A dialysis device, characterized in that: include: A liquid supply system, comprising a liquid supply pipeline and a liquid return pipeline; The connecting device according to any one of claims 1 to 7; A U-shaped three-way valve having three ports, wherein the three ports of the U-shaped three-way valve are respectively connected to the liquid outlet of the liquid supply pipeline, the connecting device and the liquid return port of the liquid return pipeline; The liquid inlet of the liquid supply pipeline is connected to the liquid outlet of the liquid return pipeline; The dialysis machine comprises a liquid suction port and a liquid return port, wherein the liquid suction port is connected to the fourth pipeline of the connecting device, and the liquid return port is connected to the third pipeline of the connecting device.

9. The dialysis device according to claim 8, characterized in that The liquid return pipeline is provided with an on-off valve, which is used to control the on or off of the liquid return pipeline; The liquid return pipeline is provided with a pressure detection device for detecting the pressure in the liquid supply pipeline.

10. The dialysis device according to claim 9, characterized in that The liquid supply system further includes a liquid storage component, which is used to store the medium. The liquid outlet of the liquid return pipeline is connected to the liquid inlet of the liquid storage component, and the liquid inlet of the liquid supply pipeline is connected to the liquid outlet of the liquid storage component.

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