Liquid balance control device and blood purification pipeline system

Abstract

The utility model discloses a liquid balance control device and a blood purification pipeline system, and relates to the technical field of medical instruments. The liquid balance control device comprises a cavity mechanism and a valve mechanism, the cavity mechanism comprises a balance cavity, an elastic diaphragm is arranged in the balance cavity and divides the balance cavity into two cavities, and liquid entering one cavity drives the elastic diaphragm to enable liquid in the other cavity to flow out. The valve mechanism comprises two valve assemblies, the two valve assemblies and the two cavities are arranged in a one-to-one correspondence mode, each valve assembly comprises two valves, and the two valves are connected with the two ends of the cavities respectively and control one valve in the two valve assemblies to be opened so that one valve can be opened in each cavity. Wherein one cavity is used for feeding liquid through the opened valve, the other cavity is used for discharging liquid through the opened valve, and the liquid in the liquid feeding cavity drives the elastic diaphragm to deform, so that the liquid feeding amount in the liquid feeding cavity is equal to the liquid discharging amount in the liquid discharging cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a liquid balance control device and a blood purification pipeline system. Background Art

[0002] The blood purification pipeline system is used in conjunction with the blood purification equipment to lead the patient's blood out of the body and pass through the filter component in the blood purification equipment to remove certain pathogenic substances therein, thereby purifying the blood to achieve the purpose of treating the disease.

[0003] In the existing blood purification pipeline system, a scale is usually required to work with a pump to balance and measure the liquid. However, the equipment that uses a scale and a pump for treatment is large in size and difficult to carry and move in the field. Because it cannot overcome the problem of inaccurate balance measurement caused by the vibration, bumps, shaking, tilting, etc. of the scale, it cannot be used in special scenarios such as the field, warships, or disaster relief. Utility Model Content

[0004] The purpose of the utility model is to provide a liquid balance control device and a blood purification pipeline system, which can ensure the balance of liquid inflow and outflow, have a small size, are easy to carry and move, and are suitable for use in special scenarios such as the field, warships or disaster relief.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A liquid balance control device, comprising:

[0007] The cavity mechanism comprises a balancing cavity, wherein an elastic diaphragm is arranged in the balancing cavity, and the elastic diaphragm divides the balancing cavity into two cavities, and liquid entering one of the cavities drives the elastic diaphragm to make liquid in the other cavity flow out;

[0008] The valve mechanism includes two valve assemblies, and the two valve assemblies are arranged in a one-to-one correspondence with the two cavities. Each of the valve assemblies includes two valves, and the two valves are respectively connected to the two ends of the cavity, and one of the valves in the two valve assemblies is controlled to open, so that liquid enters one of the cavities and liquid exits the other cavity.

[0009] As an optional solution of the liquid balance control device, the balance chamber is a spherical chamber.

[0010] As an optional scheme of the liquid balance control device, the cavity mechanism includes a cavity seat, the cavity seat includes two sub-cavity seats, a hemispherical cavity is arranged on one side of the sub-cavity seat, the two sub-cavity seats are arranged opposite to each other so that the two hemispherical cavities are enclosed to form the spherical cavity, and the elastic diaphragm is arranged between the two hemispherical cavities.

[0011] As an optional solution of the liquid balance control device, the two sub-cavity seats are ultrasonically welded to fuse the elastic diaphragm between the two sub-cavity seats.

[0012] As an optional scheme of the liquid balance control device, a first connecting cavity is provided on the side of the sub-cavity seat away from the hemispherical cavity, and more than two connecting channels for connecting the hemispherical cavity and the first connecting cavity are provided between the first connecting cavity and the hemispherical cavity; and one valve is connected to each of the two ends of the first connecting cavity.

[0013] As an optional solution of the liquid balance control device, the inner wall of the hemispherical cavity is provided with a plurality of drainage ribs, and one end of the drainage ribs is communicated with the connecting channel.

[0014] As an optional solution of the liquid balance control device, the liquid balance control device also includes a valve body mechanism, which includes two valve body assemblies. The two valve body assemblies are arranged in a one-to-one correspondence with the two valve assemblies. Each valve body assembly includes two valve bodies, and each valve corresponds to one valve body. The opening of the valve is controlled by the valve body.

[0015] As an optional scheme of the liquid balance control device, the valve includes a valve seat, an elastic pad and a valve cover, the valve seat is provided with a first flow channel, a second flow channel and a second connecting cavity, the first flow channel is connected to the balance cavity, the second flow channel is connected to the pipeline assembly, the first flow channel and the second flow channel are connected through the second connecting cavity, a control port is provided on the valve cover, the elastic pad is provided between the valve cover and the valve seat, and the elastic pad is located between the control port and the second connecting cavity, the valve core of the valve body passes through the control port to drive the elastic pad to block the connecting port of the first flow channel and the second flow channel to close the valve; the valve core of the valve body retracts, and the elastic pad elastically recovers to open the connecting port of the first flow channel and the second flow channel.

[0016] As an optional solution of the liquid balance control device, the valve body mechanism also includes a valve body seat, the two valve body assemblies are arranged on one side of the valve body seat, the cavity mechanism and the valve mechanism are installed on the side of the valve body seat away from the valve body assembly, and four through holes are arranged on the valve body seat corresponding to the valve cores of the four valve bodies, and the valve core can extend into the control port through the through holes.

[0017] As an optional solution of the liquid balance control device, the valve body mechanism also includes two sliding pressure plates, two sliding rails are relatively arranged on the valve body seat, the two ends of the sliding pressure plate are respectively matched with the two sliding rails, the cavity mechanism and the valve mechanism are arranged between the two sliding pressure plates, and the sides of the two sliding pressure plates close to each other are respectively matched with the two valve assemblies, so that the cavity mechanism and the valve mechanism can be fixed between the valve body seat and the two sliding pressure plates.

[0018] A blood purification piping system comprises an arterial piping assembly, a venous piping assembly, a dialysate piping assembly, a replacement fluid piping assembly and a waste liquid piping assembly, wherein the arterial piping assembly, the venous piping assembly, the dialysate piping assembly and the waste liquid piping assembly are respectively connected to a filter assembly, the replacement fluid piping assembly is connected to the venous piping assembly or the arterial piping assembly, and the dialysate piping assembly, the replacement fluid piping assembly and the waste liquid piping assembly are each provided with a liquid balance control device as described in any of the above schemes.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a liquid balance control device, including a balance chamber and a valve mechanism, wherein an elastic diaphragm is arranged in the balance chamber, and the balance chamber is divided into two chambers by the elastic diaphragm, two valve assemblies are arranged in one-to-one correspondence with the two chambers, and two valves in each valve assembly are respectively connected to the two ends of the chamber, and one of the valves in the two valve assemblies is respectively controlled to open, so that liquid enters one chamber and liquid exits the other chamber, and the pressure in the chamber where liquid enters is greater than the pressure in the chamber where liquid exits, and then the liquid in the chamber where liquid enters drives the elastic diaphragm to deform, so that the volume of the chamber where liquid enters increases and the volume of the chamber where liquid exits decreases, and the amount of liquid entering the chamber where liquid enters is equal to the amount of liquid exiting the chamber where liquid exits, thereby ensuring the balance of liquid inlet and liquid outlet of the balance chamber. Since the balance chamber relies on the pressure inside the chamber to cause the elastic diaphragm to deform and change the volume of the two chambers, the balance chamber will not be affected by factors such as vibration, bumps, shaking or tilting, and can ensure that the amount of liquid entering the chamber is always equal to the amount of liquid leaving the chamber; and since the elastic diaphragm is only a layer of membrane and occupies a small volume, the volume of the liquid balance control device does not need to be made very large, and it is easy to carry and move in the field, and is suitable for use in special scenes such as the field, warships or disaster relief. In addition, since the prior art uses a scale in conjunction with a pump to perform liquid balance measurement, the scale is a precision component with a relatively high cost. Compared with the prior art, the liquid balance control device saves manufacturing costs.

[0021] The blood purification pipeline system provided by the utility model uses the above-mentioned liquid balance control device in the dialysate pipeline assembly, the replacement fluid pipeline assembly and the waste liquid pipeline assembly, which can not only ensure the balance of the inlet and outlet liquids in each pipeline assembly, but also reduce the cost and volume, facilitate portability and field transportation and movement, and is suitable for use in special scenarios such as the field, warships or disaster relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a hidden valve body mechanism of a liquid balance control device provided in Embodiment 1 of the present utility model;

[0023] Figure 2 It is a side view of the hidden valve body mechanism of the liquid balance control device provided in the first embodiment of the utility model;

[0024] Figure 3 yes Figure 2 Middle AA section view;

[0025] Figure 4 This is an exploded view of the hidden valve body mechanism of the liquid balance control device provided in the first embodiment of the utility model;

[0026] Figure 5 This is a front view of a hidden valve body mechanism of a liquid balance control device provided in the first embodiment of the utility model;

[0027] Figure 6 yes Figure 5 Middle BB section view;

[0028] Figure 7 yes Figure 5 Middle CC section view;

[0029] Figure 8 yes Figure 7 A partial enlarged view of point D in the middle;

[0030] Fig. 9 It is a structural schematic diagram of the valve body mechanism provided in the first embodiment of the utility model;

[0031] Fig.10 It is a structural schematic diagram of a liquid balance control device provided in Embodiment 1 of the present utility model;

[0032] Fig.11 This is a schematic diagram of the connection between the blood purification pipeline system and the filter assembly provided in the second embodiment of the present utility model;

[0033] Fig.12 It is a structural schematic diagram of a replacement fluid pipeline assembly provided in Embodiment 2 of the present utility model.

[0034] In the figure:

[0035] 100, arterial line assembly; 200, venous line assembly; 300, dialysate line assembly; 400, replacement fluid line assembly; 500, waste fluid line assembly; 600, filter assembly; 700, liquid balance control device;

[0036] 101, front displacement interface; 201, rear displacement interface; 401, first sliding joint; 402, displacement fluid pump; 403, air collection pot; 404, hydrophobic filter; 405, displacement fluid chamber front pressure sensor; 406, second sliding joint;

[0037] 1. Cavity mechanism; 11. Sub-cavity seat; 111. Hemispherical cavity; 112. First connecting cavity; 113. Connecting channel; 114. Drainage rib; 12. Elastic diaphragm;

[0038] 2. Valve mechanism; 21. Valve; 211. Valve seat; 2111. First flow channel; 2112. Second flow channel; 2113. Second communicating cavity; 212. Elastic pad; 213. Valve cover; 2131. Control port;

[0039] 3. Valve body mechanism; 31. Valve body seat; 311. Slide rail; 32. Valve body; 321. Valve core; 33. Sliding pressure plate. DETAILED DESCRIPTION

[0040] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Embodiment 1:

[0043] like Figure 1-Figure 11As shown, this embodiment provides a liquid balance control device, including a cavity mechanism 1 and a valve mechanism 2. The cavity mechanism 1 includes a balance cavity, and an elastic diaphragm 12 is arranged in the balance cavity. The elastic diaphragm 12 divides the balance cavity into two cavities. The liquid entering one of the cavities drives the elastic diaphragm 12 to make the liquid in the other cavity flow out. The valve mechanism 2 includes two valve assemblies, and the two valve assemblies are arranged in a one-to-one correspondence with the two cavities. Each valve assembly includes two valves 21, and the two valves 21 are respectively connected to the two ends of the cavity. One of the valves 21 in the two valve assemblies is controlled to open, so that each cavity opens a valve 21, one cavity enters liquid through the opened valve 21, and the other cavity discharges liquid through the opened valve 21. The pressure in the cavity where liquid enters is greater than the pressure in the cavity where liquid is discharged, and then the liquid in the cavity where liquid enters drives the elastic diaphragm 12 to deform, so that the volume of the cavity where liquid enters increases, and the volume of the cavity where liquid is discharged decreases, and the amount of liquid entering the cavity where liquid enters is equal to the amount of liquid discharged from the cavity where liquid is discharged, thereby ensuring the balance of liquid inflow and outflow of the balance cavity. Since the balance chamber relies on the pressure inside the chamber to cause the elastic diaphragm 12 to deform and change the volume of the two chambers, the balance chamber will not be affected by factors such as vibration, bumps, shaking or tilting, and can ensure that the amount of liquid entering the chamber is always equal to the amount of liquid leaving the chamber; and since the elastic diaphragm 12 is only a layer of film and occupies a small volume, the volume of the liquid balance control device 700 does not need to be made very large, which is convenient for portability and field transportation and movement, and is suitable for use in special scenes such as the field, warships or disaster relief. In addition, since the prior art uses a scale in conjunction with a pump to perform liquid balance measurement, the scale is a precision component with a high cost, and the liquid balance control device 700 saves manufacturing costs.

[0044] Furthermore, the balancing cavity is a spherical cavity. The balancing cavity is set as a spherical cavity, and the inner wall of the spherical cavity is a spherical wall surface. Under the action of the liquid, the elastic diaphragm 12 is more convenient to completely fit with the spherical wall surface, and it is not easy to form a dead angle, causing residual air and liquid in the cavity to affect the liquid output of the cavity, and it can ensure that the maximum liquid inlet and maximum liquid outlet of the cavity are equal to the volume of the balancing cavity.

[0045] Specifically, the cavity mechanism 1 includes a cavity seat, and the cavity seat includes two sub-cavity seats 11. A hemispherical cavity 111 is provided on one side of the sub-cavity seat 11. The two sub-cavity seats 11 are arranged opposite to each other so that the two hemispherical cavities 111 enclose a spherical cavity, and the elastic diaphragm 12 is arranged between the two hemispherical cavities 111. In order to realize that the elastic diaphragm 12 is arranged between the two cavities, the cavity seat is arranged as a split structure, and the hemispherical cavities 111 in the two sub-cavity seats 11 enclose a spherical cavity, and the elastic diaphragm 12 is sandwiched between the two hemispherical cavities 111. In this embodiment, the two sub-cavity seats 11 are ultrasonically welded to fuse the elastic diaphragm 12 between the two sub-cavity seats 11. During assembly, the elastic diaphragm 12 is first placed on the end face of the hemispherical cavity 111 of one of the sub-cavity seats 11, and then the hemispherical cavity 111 of the other sub-cavity seat 11 is covered on the elastic diaphragm 12. After the two hemispherical cavities 111 are aligned, the gap between the two sub-cavity seats 11 is ultrasonically welded so that the circumference of the elastic diaphragm 12 is fused between the two hemispherical cavities 111. In other embodiments, the two sub-cavity seats 11 can also be connected by bolts or bonding. When the two sub-cavity seats 11 are connected by bolts, a sealing gasket needs to be set between the end faces of the two hemispherical cavities 111, and then the two sub-cavities, the sealing gasket and the elastic diaphragm 12 are fixedly connected together by bolts to ensure the sealing of the balance cavity. When the two sub-cavity seats 11 are bonded and fixed, first apply glue on the end face of the hemispherical cavity 111 of one of the sub-cavity seats 11, place the elastic diaphragm 12 on the glue-coated end face and bond it, then apply glue on the circumference of the elastic diaphragm 12, and bond the end face of the hemispherical cavity 111 of the other sub-cavity seat 11 to the circumference of the elastic diaphragm 12 and fix it.

[0046] In this embodiment, the elastic diaphragm 12 is a rubber diaphragm. Of course, in other embodiments, the elastic diaphragm 12 may also be a plastic diaphragm made of a plastic film with greater elasticity.

[0047] Furthermore, a first connecting cavity 112 is provided on one side of the sub-cavity seat 11 away from the hemispherical cavity 111, and two or more connecting channels 113 for connecting the hemispherical cavity 111 and the first connecting cavity 112 are provided between the first connecting cavity 112 and the hemispherical cavity 111; and a valve 21 is connected to each end of the first connecting cavity 112. The liquid entering through one of the valves 21 in the cavity first enters the first connecting cavity 112, and then enters the cavity evenly through the two or more connecting channels 113, so that the elastic diaphragm 12 is subjected to uniform force in all directions, avoiding the formation of a dead cavity at a certain position, residual air and liquid, and reducing the liquid output of the other cavity, which cannot meet the requirement of equal liquid inflow and liquid outflow. In this embodiment, three connecting channels 113 are provided, two of which are provided at the two ends of the hemispherical cavity 111, and the other is provided at the center of the hemispherical cavity 111, so that the liquid enters the cavity evenly from the upper, middle and lower directions of the hemispherical cavity 111, and acts on the upper, middle and lower positions of the elastic diaphragm 12 respectively, so that the elastic diaphragm 12 is subjected to uniform force, and when the elastic diaphragm 12 is deformed, it can gradually fit with the upper, middle and lower positions of another hemispherical cavity 111 at the same time.

[0048] Of course, in other embodiments, only two connecting channels 113 may be provided at the two ends of the hemispherical cavity 111. Alternatively, five connecting channels 113 may be provided, and in addition to the three connecting channels 113 in this embodiment, one connecting channel 113 may be added between the upper and middle positions of the hemispherical cavity 111, and one connecting channel 113 may be added between the middle and lower positions of the hemispherical cavity 111.

[0049] Furthermore, the inner wall of the hemispherical cavity 111 is provided with a plurality of drainage ribs 114, and one end of the drainage ribs 114 is connected to the connecting channel 113. By providing the drainage ribs 114, the friction between the rubber diaphragm and the inner wall of the hemispherical cavity 111 is increased, so as to prevent the rubber diaphragm from being unable to be separated after being attached to the smooth inner wall of the hemispherical cavity 111. In this embodiment, the drainage ribs 114 are grooves opened along the meridians of the hemispherical cavity 111, and the two sides of the grooves are raised to form ribs. One end of the plurality of drainage ribs 114 is connected to the connecting channel 113 in the middle of the corresponding hemispherical cavity 111, so that the liquid entering the groove can flow to the connecting channel 113, and then enter the first connecting cavity 112 and be discharged through the valve 21, and the flow of the liquid in the groove has a certain impact force on the rubber diaphragm, which can separate the rubber diaphragm from the inner wall of the hemispherical cavity 111.

[0050] like Figure 5-Figure 8As shown, in order to individually control the two valves 21 in the valve assembly of each cavity, when one valve 21 of one cavity is opened, the other valve 21 is closed; similarly, when one valve 21 of another cavity is opened, the other valve 21 is closed. The liquid balance control device 700 also includes a valve body mechanism 3, which includes two valve body assemblies. The two valve body assemblies are arranged one-to-one with the two valve assemblies. Each valve body assembly includes two valve bodies 32, and each valve 21 is arranged corresponding to a valve body 32. The valve 21 is controlled to be opened or closed by the valve body 32. In this embodiment, the valve body 32 is a solenoid valve. Of course, in other embodiments, the valve body 32 can also be a pneumatic switch valve or a switch valve of other structures.

[0051] Specifically, the valve 21 includes a valve seat 211, an elastic pad 212 and a valve cover 213. The valve seat 211 is provided with a first flow channel 2111, a second flow channel 2112 and a second connecting cavity 2113. The first flow channel 2111 is connected to the balancing cavity, the second flow channel 2112 is connected to the pipeline assembly, the first flow channel 2111 and the second flow channel 2112 are connected through the second connecting cavity 2113, and the valve cover 213 is provided with a control port 2131. The elastic pad 212 It is arranged between the valve cover 213 and the valve seat 211, and the elastic pad 212 is located between the control port 2131 and the second connecting cavity 2113. The valve core 321 of the valve body 32 passes through the control port 2131 to drive the elastic pad 212 to block the connecting port between the first flow channel 2111 and the second flow channel 2112 to close the valve 21; the valve core 321 of the valve body 32 retracts, and the elastic pad 212 elastically recovers to open the connecting port between the first flow channel 2111 and the second flow channel 2112. When the solenoid valve is powered off, the valve core 321 is not attracted and is in an extended state. The valve core 321 passes through the control port 2131 and contacts the elastic pad 212, and drives the elastic pad 212 to the second connecting cavity 2113 and blocks the connecting port of the first flow channel 2111 and the second flow channel 2112. At this time, the valve 21 is closed, and the liquid in the pipeline assembly cannot enter the first flow channel 2111 through the second flow channel 2112, and then cannot enter the cavity through the first connecting cavity 112 and the connecting channel 113. Similarly, the liquid in the cavity enters the first connecting cavity 112 through the connecting channel 113, and then enters the first flow channel 2111 from the first connecting cavity 112, and cannot enter the second flow channel 2112 and the pipeline assembly through the second connecting cavity 2113. When the solenoid valve is energized, the valve core 321 is attracted and contracted, and the valve core 321 retracts from the control port 2131. The elastic pad 212 recovers to between the control port 2131 and the second connecting cavity 2113 under the action of its own elastic restoring force. The liquid in the pipeline assembly enters the second connecting cavity 2113 through the second flow channel 2112 and then enters the first flow channel 2111, enters the first connecting cavity 112 from the first flow channel 2111, and then enters the cavity through the connecting channel 113. Similarly, the liquid in the cavity enters the first connecting cavity 112 through the connecting channel 113, then enters the first flow channel 2111 from the first connecting cavity 112, enters the second flow channel 2112 through the second connecting cavity 2113, and finally is discharged into the pipeline assembly.

[0052] In this embodiment, the elastic pad 212 is made of rubber or metal springs. The valve seat 211 and the valve cover 213 are connected by ultrasonic welding, and the circumferential direction of the elastic pad 212 is sandwiched between the valve seat 211 and the valve cover 213.

[0053] Specifically, Fig. 9 and Fig.10As shown, the valve body mechanism 3 also includes a valve body seat 31, and the two valve body components are both arranged on one side of the valve body seat 31. The cavity mechanism 1 and the valve mechanism 2 are installed on the side of the valve body seat 31 away from the valve body component. The valve core 321 corresponding to the four valve bodies 32 is provided with four through holes on the valve body seat 31, and the valve core 321 can extend into the control port 2131 through the through holes. After the cavity mechanism 1 and the valve mechanism 2 are assembled, the assembly of the cavity mechanism 1 and the valve mechanism 2 is fixed to the valve body mechanism 3, and the valve body component and the assembly of the cavity mechanism 1 and the valve mechanism 2 are arranged on opposite sides of the valve body seat 31, so that the four valve bodies 32 are arranged corresponding to the four valves 21, and the structure is compact, the occupied volume is small, and it is easy to carry and move.

[0054] In order to facilitate the disassembly and assembly of the liquid balance control device 700, the valve body mechanism 3 further includes two sliding pressure plates 33, and two slide rails 311 are relatively arranged on the valve body seat 31. The two ends of the sliding pressure plate 33 are respectively matched with the two slide rails 311, and the cavity mechanism 1 and the valve mechanism 2 are arranged between the two sliding pressure plates 33, and the sides of the two sliding pressure plates 33 close to each other are respectively matched with the two valve assemblies, which can fix the cavity mechanism 1 and the valve mechanism 2 between the valve body seat 31 and the two sliding pressure plates 33. The two sliding pressure plates 33 can move on the two slide rails 311 in directions approaching or moving away from each other. When installing the assembly of the cavity mechanism 1 and the valve mechanism 2, the two sliding pressure plates 33 are first moved in directions away from each other so that enough space is left between the two sliding pressure plates 33 to install the assembly of the cavity mechanism 1 and the valve mechanism 2. The assembly of the cavity mechanism 1 and the valve mechanism 2 is installed on the valve body seat 31 so that the four valves 21 and the four valve bodies 32 are arranged one by one. Then, the two sliding pressure plates 33 are moved in directions approaching each other until they are moved to the side where the two sliding pressure plates 33 are close to each other and are respectively engaged with the two valve assemblies to fix the assembly of the cavity mechanism 1 and the valve mechanism 2 on the valve body seat 31.

[0055] Embodiment 2:

[0056] like Fig.11 As shown, this embodiment provides a blood purification pipeline system, which is connected to a blood purification device and is used to lead the blood in the human body to the filter assembly 600 of the blood purification device for purification treatment, and then return the purified blood to the human body.

[0057] The blood purification pipeline system includes an arterial pipeline assembly 100, a venous pipeline assembly 200, a dialysate pipeline assembly 300, a replacement fluid pipeline assembly 400 and a waste liquid pipeline assembly 500. The arterial pipeline assembly 100, the venous pipeline assembly 200, the dialysate pipeline assembly 300 and the waste liquid pipeline assembly 500 are respectively connected to the filter assembly 600, the replacement fluid pipeline assembly 400 is connected to the venous pipeline assembly 200 or the arterial pipeline assembly 100, and the dialysate pipeline assembly 300, the replacement fluid pipeline assembly 400 and the waste liquid pipeline assembly 500 are all provided with the liquid balance control device 700 provided in Example 1. One end of the dialysate piping assembly 300 is connected to the dialysate bag, and the other end is connected to the filter assembly 600. The liquid balance control device 700 in the dialysate piping assembly 300 can make the liquid entering the balance cavity of the dialysate bag equal to the liquid entering the filter assembly 600 through the balance cavity, so as to accurately control the dialysate entering the filter assembly 600. One end of the replacement fluid piping assembly 400 is connected to the replacement fluid bag, and the other end is connected to the arterial piping assembly 100 or the venous piping assembly 200. The liquid balance control device 700 in the replacement fluid piping assembly 400 can make the liquid entering the balance cavity of the replacement fluid bag equal to the liquid entering the arterial piping assembly 100 or the venous piping assembly 200 through the balance cavity, so as to accurately control the replacement fluid entering the arterial piping assembly 100 or the venous piping assembly 200. One end of the waste liquid pipeline assembly 500 is connected to the filter assembly 600, and the other end is connected to the waste liquid bag. The liquid balance control device 700 in the waste liquid pipeline assembly 500 can make the waste liquid discharged from the filter assembly 600 equal to the waste liquid discharged to the waste liquid bag through the balance chamber. The specific working principle of each pipeline assembly in the blood purification pipeline system is already existing technology and will not be repeated here.

[0058] In this embodiment, only the liquid balance control device 700 in the replacement fluid pipeline assembly 400 is taken as an example to specifically describe the specific working principle of the liquid balance control device 700 used in the pipeline assembly. The working principle of the liquid balance control device 700 provided in the first embodiment used in other pipeline assemblies such as the dialysate pipeline assembly 300 and the waste liquid pipeline assembly 500 is similar to the working principle of the liquid balance control device 700 in the replacement fluid pipeline assembly 400, and will not be repeated here.

[0059] like Fig.11 As shown, the replacement fluid pipeline assembly 400 can be connected to the arterial pipeline assembly 100 through the front replacement interface 101 in the arterial pipeline assembly 100, and can also be connected to the venous pipeline assembly 200 through the rear replacement interface 201 in the venous pipeline assembly 200. This embodiment is described by taking the connection between the replacement fluid pipeline assembly 400 and the rear replacement interface 201 as an example.

[0060] like Fig.12As shown, the replacement fluid bag is first connected to the first sliding joint 401 at one end of the replacement fluid pipeline assembly 400. After the replacement fluid in the replacement fluid bag enters the pipeline, it flows through the air collection pot 403 under the suction provided by the replacement fluid pump 402. The air in the pipeline is discharged by the air collection pot 403, and the discharged air is discharged at the hydrophobic filter 404 to prevent the air from entering the balance chamber of the liquid balance control device 700 and affecting the balance calculation. When the air in the air collection pot 403 is completely discharged, the replacement fluid pump 402 rotates to apply pressure to the balance chamber, and the pressure is determined by the pressure sensor 405 before the replacement fluid chamber. At the same time, each of the two valve assemblies opens a valve 21 through the valve body 32, and the valve 21 located at the top of one valve assembly is opened, and the valve 21 located at the bottom is closed; the valve 21 located at the bottom of the other valve assembly is opened, and the valve 21 located at the top is closed. When the pressure reaches the standard that the elastic diaphragm 12 in the balance chamber can be aligned with the inner wall of one hemispherical cavity 111 to the inner wall of the other hemispherical cavity 111, the balance chamber is filled with liquid. Then the second sliding joint 406 at the other end of the replacement fluid pipeline assembly 400 is connected to the rear replacement interface 201. Assuming that the volume of the elastic diaphragm 12 in the balance chamber when it is aligned with the inner wall of the other hemispherical cavity 111 is 15ml, switch the open valve 21 in the two valve assemblies, the valve 21 located at the top of one valve assembly is closed, and the valve 21 located at the bottom is opened; the valve 21 located at the bottom of the other valve assembly is closed, and the valve 21 located at the top is opened. The replacement fluid in the replacement fluid bag flows into the other cavity, driving the elastic diaphragm 12 to move close to the cavity filled with liquid, so that the 15ml replacement fluid in the cavity filled with liquid flows into the venous pipeline assembly 200 through the rear replacement interface 201 connected to the second sliding joint 406, achieving the purpose of accurately controlling the replacement fluid entering the venous pipeline assembly 200. After the replacement fluid in the cavity filled with liquid has entered the venous tubing assembly 200 , the open valve 21 in the two valve assemblies is switched to allow the replacement fluid in the other cavity to flow into the venous tubing assembly 200 .

[0061] It should be noted that the liquid balance control device 700 and the blood purification pipeline system in the present invention are disposable and cannot be reused.

[0062] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A liquid balance control device, characterized in that: include: A cavity mechanism (1) comprises a balancing cavity, wherein an elastic diaphragm (12) is arranged in the balancing cavity, wherein the elastic diaphragm (12) divides the balancing cavity into two cavities, and liquid entering one of the cavities drives the elastic diaphragm (12) to cause liquid in the other cavity to flow out; The valve mechanism (2) comprises two valve assemblies, the two valve assemblies are arranged in a one-to-one correspondence with the two cavities, each of the valve assemblies comprises two valves (21), the two valves (21) are respectively connected to the two ends of the cavity, and one of the valves (21) in the two valve assemblies is controlled to open, so that liquid enters one of the cavities and liquid exits the other cavity.

2. The liquid balance control device according to claim 1, characterized in that: The balance cavity is a spherical cavity.

3. The liquid balance control device according to claim 2, characterized in that: The cavity mechanism (1) comprises a cavity seat, the cavity seat comprises two sub-cavity seats (11), one side of the sub-cavity seat (11) is provided with a hemispherical cavity (111), the two sub-cavity seats (11) are arranged opposite to each other so that the two hemispherical cavities (111) are enclosed to form the spherical cavity, and the elastic diaphragm (12) is arranged between the two hemispherical cavities (111).

4. The liquid balance control device according to claim 3, characterized in that: The two sub-cavity seats (11) are ultrasonically welded to fuse the elastic diaphragm (12) between the two sub-cavity seats (11).

5. The liquid balance control device according to claim 3, characterized in that: A first connecting cavity (112) is arranged on a side of the sub-cavity seat (11) away from the hemispherical cavity (111); two or more connecting passages (113) for connecting the hemispherical cavity (111) and the first connecting cavity (112) are arranged between the first connecting cavity (112) and the hemispherical cavity (111); and one of the valves (21) is connected to each of the two ends of the first connecting cavity (112).

6. The liquid balance control device according to claim 5, characterized in that: The inner wall of the hemispherical cavity (111) is provided with a plurality of drainage ribs (114), and one end of the drainage rib (114) is in communication with the connecting channel (113).

7. The liquid balance control device according to claim 1, characterized in that: The liquid balance control device further comprises a valve body mechanism (3), wherein the valve body mechanism (3) comprises two valve body assemblies, wherein the two valve body assemblies are arranged in a one-to-one correspondence with the two valve assemblies, each valve body assembly comprises two valve bodies (32), and each valve (21) is arranged corresponding to one valve body (32), and the valve (21) is controlled to open by the valve body (32).

8. The liquid balance control device according to claim 7, characterized in that: The valve (21) comprises a valve seat (211), an elastic pad (212) and a valve cover (213); a first flow channel (2111), a second flow channel (2112) and a second communicating cavity (2113) are arranged in the valve seat (211); the first flow channel (2111) is connected to the balancing cavity; the second flow channel (2112) is connected to the pipeline assembly; the first flow channel (2111) and the second flow channel (2112) are communicated through the second communicating cavity (2113); a control port (2131) is arranged on the valve cover (213); the elastic pad (212) is arranged on the valve cover (213); 213) and the valve seat (211), and the elastic pad (212) is located between the control port (2131) and the second connecting cavity (2113), the valve core (321) of the valve body (32) passes through the control port (2131) and can drive the elastic pad (212) to block the connecting port between the first flow channel (2111) and the second flow channel (2112), so as to close the valve (21); the valve core (321) of the valve body (32) retracts, and the elastic pad (212) elastically recovers to open the connecting port between the first flow channel (2111) and the second flow channel (2112).

9. The liquid balance control device according to claim 8, characterized in that: The valve body mechanism (3) further comprises a valve body seat (31), the two valve body components are both arranged on one side of the valve body seat (31), the cavity mechanism (1) and the valve mechanism (2) are installed on the side of the valve body seat (31) facing away from the valve body component, and the valve body seat (31) is provided with four through holes corresponding to the valve cores (321) of the four valve bodies (32), and the valve core (321) can extend into the control port (2131) through the through holes.

10. The liquid balance control device according to claim 9, characterized in that: The valve body mechanism (3) further comprises two sliding pressure plates (33), two slide rails (311) are arranged opposite to each other on the valve body seat (31), two ends of the sliding pressure plate (33) respectively cooperate with the two slide rails (311), the cavity mechanism (1) and the valve mechanism (2) are arranged between the two sliding pressure plates (33), and the sides of the two sliding pressure plates (33) close to each other respectively cooperate with the two valve assemblies, so that the cavity mechanism (1) and the valve mechanism (2) can be fixed between the valve body seat (31) and the two sliding pressure plates (33).

11. A blood purification pipeline system, characterized in that: The invention comprises an arterial pipeline assembly (100), a venous pipeline assembly (200), a dialysate pipeline assembly (300), a replacement fluid pipeline assembly (400) and a waste fluid pipeline assembly (500); the arterial pipeline assembly (100), the venous pipeline assembly (200), the dialysate pipeline assembly (300) and the waste fluid pipeline assembly (500) are respectively connected to a filter assembly (600); the replacement fluid pipeline assembly (400) is connected to the venous pipeline assembly (200) or the arterial pipeline assembly (100); and the dialysate pipeline assembly (300), the replacement fluid pipeline assembly (400) and the waste fluid pipeline assembly (500) are all provided with a liquid balance control device as described in any one of claims 1 to 10.

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