Portable blood purification equipment and volume pot liquid path switching device

Abstract

The utility model discloses portable blood purification equipment and a volume pot liquid path switching device, relates to the technical field of medical equipment, and aims to solve the problems of large volume and heavy weight of portable CRRT equipment. The device comprises a displacement liquid volume pot group, the bottom end of the displacement liquid volume pot group is communicated with a displacement liquid bag, and the bottom end of the displacement liquid volume pot group is communicated with a displacement liquid bag; the displacement liquid volume kettle group is used for containing dialysate or displacement liquid, the displacement liquid pipeline is arranged at the top end of the displacement liquid volume kettle group and used for controlling the liquid level of the displacement liquid volume kettle group, the bottom end of the waste liquid volume kettle group is communicated with the waste liquid bag, and the waste liquid volume kettle group is used for containing waste liquid. The waste liquid pipeline is arranged at the top end of the waste liquid capacity kettle set and used for controlling the liquid level of the waste liquid capacity kettle set, the at least two balance control valves are arranged at the bottom end of the corresponding displacement liquid capacity kettle set and the bottom end of the corresponding waste liquid capacity kettle set, and the balance control valves are connected with the controller. And the opening and closing of the bottom ends of the displacement liquid volume kettle group and the waste liquid volume kettle group are controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, and more specifically, to a portable blood purification device and a liquid path switching device for a capacity pot. Background Art

[0002] In the prior art, when performing continuous renal replacement therapy (CRRT), its working principle is to imitate the filtration function of the glomerulus, use a semi-permeable membrane filter to help remove water and solutes in the blood, and separate the substances required by the body from the waste substances to be metabolized, and input the substances required by the body into the body to maintain the balance of electrolytes in the body and the normal operation of the body. While performing blood filtration, it can also help eliminate inflammatory mediators in the blood, improve the patient's physical condition, reduce the probability of infection and concurrent inflammation, improve the function of the body's own immune system, and regular blood purification can maintain the overall physical state of the patient.

[0003] For existing CRRT devices, they are bulky and generally fixed beside the hospital beds in hospital departments. Patients need to be sent to the hospital for treatment. In case of sudden illness or accidental injury of patients, there is a risk of missing the best treatment time. Or in the front line such as disaster areas and battlefields, patients may need to undergo blood purification treatment immediately, but lose their lives due to the lack of relevant equipment by the medical rescue team.

[0004] Currently, the CRRT devices on the market mainly use the weighing method to calculate the liquid balance. Different from traditional CRRT devices, portable CRRT devices use the volumetric liquid balance calculation method, and control the liquid path balance in hemodialysis by calculating the volume of the capacity pot. In clinical blood purification treatment, this device needs to control the corresponding dialysate, replacement fluid and waste liquid to enter and exit the quantitative pot through a liquid path balance system. The current control valves use multiple independent valves to control the flow direction of the liquid path. This not only does not meet the requirements of portable CRRT devices for small volume and weight, but also when using multiple valves to control the liquid path, it is necessary to evaluate the response speed of valve control and the assembly difficulty of clinical nursing staff.

[0005] Therefore, how to solve the problems of large volume and large weight of portable CRRT devices is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0006] In view of this, the purpose of the present utility model is to provide a liquid path switching device for a capacity pot to match the treatment logic and lightweight requirements of portable CRRT devices, with a small volume and convenient installation.

[0007] Another object of the present utility model is to provide a portable blood purification device including the above-mentioned liquid path switching device for the capacity pot, which is small in size, light in weight, and convenient for control and installation.

[0008] In order to achieve the above object, the present utility model provides the following technical solutions:

[0009] A liquid path switching device for a capacity pot, comprising:

[0010] A replacement fluid capacity pot group for containing dialysis fluid or replacement fluid, the bottom end of the replacement fluid capacity pot group is communicated with a replacement fluid bag;

[0011] A replacement fluid pipeline is arranged at the top end of the replacement fluid capacity pot group, and the replacement fluid pipeline is used to control the liquid level of the replacement fluid capacity pot group;

[0012] A waste fluid capacity pot group for containing waste fluid, the bottom end of the waste fluid capacity pot group is communicated with a waste fluid bag;

[0013] A waste fluid pipeline is arranged at the top end of the waste fluid capacity pot group, and the waste fluid pipeline is used to control the liquid level of the waste fluid capacity pot group;

[0014] At least two balance control valves are provided, at least two balance control valves are arranged at the bottom ends of the corresponding replacement fluid capacity pot group and the waste fluid capacity pot group, the balance control valves are connected to a controller, and the balance control valves are used to control the opening and closing of the bottom ends of the replacement fluid capacity pot group and the waste fluid capacity pot group.

[0015] Preferably, the replacement fluid pipeline includes:

[0016] A replacement fluid pipeline, the replacement fluid pipeline is connected to the top end of the replacement fluid capacity pot group, and the replacement fluid pipeline is connected to a first internal pipeline;

[0017] A replacement fluid exhaust solenoid valve is arranged in the first internal pipeline, and the replacement fluid exhaust solenoid valve is connected to a controller;

[0018] A replacement fluid air extraction solenoid valve is arranged in the first internal pipeline, and the replacement fluid air extraction solenoid valve is connected to a controller.

[0019] Preferably, a three-way valve for connecting two branches is arranged on the first internal pipeline, a replacement fluid exhaust solenoid valve is arranged on one branch, a replacement fluid air extraction solenoid valve and a replacement fluid air extraction pump for driving the replacement fluid capacity pot group to extract fluid are arranged on the other branch, and the replacement fluid air extraction pump is connected to a controller.

[0020] Preferably, the waste fluid pipeline includes:

[0021] A waste fluid pipeline, the waste fluid pipeline is connected to the top end of the waste fluid capacity pot group, and the waste fluid pipeline is connected to a second internal pipeline;

[0022] The waste liquid exhaust solenoid valve is provided in the second internal pipeline and is connected to the controller.

[0023] Preferably, hydrophobic air filters are provided in both the first internal pipeline and the second internal pipeline.

[0024] Preferably, the replacement fluid capacity pot group includes a first capacity pot and a second capacity pot for containing dialysis fluid or replacement fluid. The first capacity pot and the second capacity pot are arranged in parallel, and the bottoms of the first capacity pot and the second capacity pot are both connected to the replacement fluid bag, and the tops of the first capacity pot and the second capacity pot are both connected to the first internal pipeline.

[0025] Preferably, liquid level sensors are provided in both the first capacity pot and the second capacity pot, and the liquid level sensors are connected to the controller.

[0026] Preferably, the waste liquid capacity pot group includes a third capacity pot and a fourth capacity pot for containing waste liquid. The third capacity pot and the fourth capacity pot are arranged in parallel, and the bottoms of the third capacity pot and the fourth capacity pot are both connected to the waste liquid bag, and the tops of the third capacity pot and the fourth capacity pot are both connected to the second internal pipeline.

[0027] Preferably, the first capacity pot, the second capacity pot, the third capacity pot and the fourth capacity pot are of an integral structure.

[0028] A portable blood purification device includes the capacity pot liquid path switching device described in any one of the above.

[0029] The capacity pot liquid path switching device provided by the present utility model includes a replacement fluid capacity pot group, a replacement fluid pipeline, a waste liquid capacity pot group, a waste liquid pipeline and a balance control valve. Specifically, the bottom of the replacement fluid capacity pot group is connected to the replacement fluid bag. The replacement fluid capacity pot group is used to contain dialysis fluid or replacement fluid. The replacement fluid pipeline is provided at the top of the replacement fluid capacity pot group and is used to control the liquid level of the replacement fluid capacity pot group. Through the replacement fluid pipeline, the dialysis fluid or replacement fluid in the replacement fluid bag is pumped into the replacement fluid capacity pot group from the bottom of the replacement fluid capacity pot group, and the liquid level height of the dialysis fluid or replacement fluid entering the replacement fluid capacity pot group is controlled.

[0030] The bottom of the waste liquid capacity pot group is connected to the waste liquid bag. The waste liquid capacity pot group is used to contain waste liquid. The waste liquid pipeline is provided at the top of the waste liquid capacity pot group and is used to control the liquid level of the waste liquid capacity pot group. Through the waste liquid pipeline, the waste liquid in the waste liquid bag is pumped into the waste liquid capacity pot group from the bottom of the waste liquid capacity pot group, and the liquid level height of the waste liquid entering the waste liquid capacity pot group is controlled.

[0031] There are at least two balance control valves. At least two balance control valves are provided at the bottom ends of the corresponding replacement fluid volume pots and waste fluid volume pots. The balance control valves are connected to the controller and are used to control the opening and closing of the bottom ends of the replacement fluid volume pots and waste fluid volume pots. When it is necessary to infuse the replacement fluid volume pots and waste fluid volume pots, the controller controls the corresponding balance control valves to open, so that the corresponding liquid bags are communicated with the bottom ends of the volume pots, thereby realizing the liquid inlet of the volume pots.

[0032] The volume pot liquid path switching device arranged in the above manner can match the treatment logic and lightweight requirements of portable CRRT equipment, and has the advantages of small volume, light weight, convenient control and installation. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0034] Figure 1 It is a schematic structural diagram of the volume pot liquid path switching device provided by the present invention;

[0035] Figure 2 It is a schematic structural diagram of the replacement fluid pipeline of the volume pot liquid path switching device provided by the present invention;

[0036] Figure 3 It is a schematic structural diagram of the waste fluid pipeline of the volume pot liquid path switching device provided by the present invention;

[0037] Figure 4 It is a schematic structural diagram of the replacement fluid volume pot group and waste fluid volume pot group of the volume pot liquid path switching device provided by the present invention.

[0038] Reference Signs:

[0039] 1 - replacement fluid volume pot group, 11 - first volume pot, 12 - second volume pot;

[0040] 2 - replacement fluid pipeline, 21 - replacement fluid pipe, 22 - first internal pipe, 23 - replacement fluid exhaust solenoid valve, 24 - replacement fluid air extraction solenoid valve, 25 - replacement fluid air extraction pump;

[0041] 3 - waste fluid volume pot group, 31 - third volume pot, 32 - fourth volume pot;

[0042] 4 - waste fluid pipeline, 41 - waste fluid pipe, 42 - second internal pipe, 43 - waste fluid exhaust solenoid valve;

[0043] 5 - Balance control valve;

[0044] 6 - Three - way valve;

[0045] 7 - Hydrophobic air filter. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0047] It should be noted that the orientation terms such as "upper" and "lower" below are defined based on the accompanying drawings of the specification.

[0048] The core of the present utility model is to provide a liquid - path switching device for a capacity pot to match the treatment logic and lightweight requirements of a portable CRRT device, with a small volume and convenient installation.

[0049] Another core of the present utility model is to provide a portable blood purification device including the above - mentioned liquid - path switching device for a capacity pot, which has a small volume, light weight, and is convenient for control and installation.

[0050] Please refer to Figure 1 , a liquid - path switching device for a capacity pot includes a replacement fluid capacity pot group 1, a replacement fluid pipeline 2, a waste fluid capacity pot group 3, a waste fluid pipeline 4, and a balance control valve 5.

[0051] Specifically, the bottom end of the replacement fluid capacity pot group 1 is connected to a replacement fluid bag. The replacement fluid capacity pot group 1 is used to hold dialysis fluid or replacement fluid. The replacement fluid pipeline 2 is arranged at the top of the replacement fluid capacity pot group 1 and is used to control the liquid level of the replacement fluid capacity pot group 1. Through the replacement fluid pipeline 2, the dialysis fluid or replacement fluid in the replacement fluid bag is pumped into the replacement fluid capacity pot group 1 from the bottom end of the replacement fluid capacity pot group 1, and the liquid level height of the dialysis fluid or replacement fluid entering the replacement fluid capacity pot group 1 is controlled.

[0052] The bottom end of the waste fluid capacity pot group 3 is connected to a waste fluid bag. The waste fluid capacity pot group 3 is used to hold waste fluid. The waste fluid pipeline 4 is arranged at the top of the waste fluid capacity pot group 3 and is used to control the liquid level of the waste fluid capacity pot group 3. Through the waste fluid pipeline 4, the waste fluid in the waste fluid bag is pumped into the waste fluid capacity pot group 3 from the bottom end of the waste fluid capacity pot group 3, and the liquid level height of the waste fluid entering the waste fluid capacity pot group 3 is controlled.

[0053] There are at least two balance control valves 5, and at least two balance control valves 5 are arranged at the bottom ends of the corresponding replacement fluid capacity pots 1 and waste fluid capacity pots 3. The balance control valves 5 are connected to the controller and are used to control the opening and closing of the bottom ends of the replacement fluid capacity pots 1 and waste fluid capacity pots 3. When it is necessary to infuse the replacement fluid capacity pots 1 and waste fluid capacity pots 3, the controller controls the corresponding balance control valves 5 to open, so that the corresponding liquid bags are communicated with the bottom ends of the capacity pots, so as to realize the liquid inlet of the capacity pots.

[0054] Among them, before the replacement fluid capacity pot 1 is filled with liquid from the balance control valve 5 below, it is necessary to open the upper replacement fluid pipeline 2, so that the replacement fluid capacity pot 1 is filled with liquid and then the replacement fluid pipeline 2 is closed. When it is necessary to discharge the liquid in the replacement fluid capacity pot 1, open the upper replacement fluid pipeline 2 and cooperate with the balance control valve 5 to lower the liquid level in the replacement fluid capacity pot 1.

[0055] It should be noted that the liquid inlet end and the liquid discharge end of the replacement fluid capacity pot 1 are both the bottom end of the replacement fluid capacity pot 1, and the liquid inlet end and the liquid discharge end of the waste fluid capacity pot 3 are both the bottom end of the waste fluid capacity pot 3.

[0056] The capacity pot liquid path switching device set in the above manner can match the treatment logic and lightweight requirements of portable CRRT equipment, and has the advantages of small volume, light weight, and being convenient for control and installation.

[0057] Please refer to Figure 2 , the replacement fluid pipeline 2 includes a replacement fluid pipe 21, a replacement fluid exhaust solenoid valve 23, and a replacement fluid air extraction solenoid valve 24. The replacement fluid pipe 21 is connected to the top end of the replacement fluid capacity pot 1 and is connected to the first internal pipe 22. The replacement fluid exhaust solenoid valve 23 is arranged on the first internal pipe 22 and is connected to the controller. The replacement fluid air extraction solenoid valve 24 is arranged on the first internal pipe 22 and is connected to the controller.

[0058] It should be noted that when it is necessary to fill the replacement fluid capacity pot 1 with liquid, the controller controls the replacement fluid air extraction solenoid valve 24 to open, so that the replacement fluid pipe 21 is communicated with the replacement fluid capacity pot 1, and at the same time controls the balance control valve 5 to open, so that the replacement fluid in the replacement fluid bag is pumped out to the replacement fluid capacity pot 1. When it is necessary to discharge the liquid in the replacement fluid capacity pot 1, the controller controls the replacement fluid exhaust solenoid valve 23 to open, so that the replacement fluid pipe 21 is communicated with the replacement fluid capacity pot 1, and at the same time controls the balance control valve 5 to open, so that the replacement fluid in the replacement fluid capacity pot 1 is discharged.

[0059] In the above situation, a three-way valve 6 for connecting two branch circuits is provided on the first internal pipe 22. A replacement liquid exhaust solenoid valve 23 is provided on one of the branch circuits, and a replacement liquid air extraction solenoid valve 24 and a replacement liquid air extraction pump 25 for driving the extraction of the replacement liquid capacity pot group 1 are provided on the other branch circuit. The replacement liquid air extraction pump 25 is connected to the controller.

[0060] It can be understood that according to the treatment logic of the device, a three-way valve 6 is used in the replacement liquid pipeline 2 to connect the replacement liquid exhaust pipeline and the replacement liquid air extraction pipeline. When the replacement liquid capacity pot group 1 needs to raise the liquid level, the controller controls the replacement liquid exhaust solenoid valve 23 to close, controls the replacement liquid air extraction solenoid valve 24 and the balance control valve 5 to open, and pumps the replacement liquid in the replacement liquid bag to the preset liquid level of the replacement liquid capacity pot group 1 through the replacement liquid air extraction pump 25.

[0061] When the replacement liquid capacity pot group 1 needs to exhaust air, the controller controls the replacement liquid air extraction solenoid valve 24 and the replacement liquid air extraction pump 25 to close, controls the replacement liquid exhaust solenoid valve 23 and the balance control valve 5 to open, and discharges the liquid in the replacement liquid capacity pot group 1 through the power pump of the device. During the treatment process, both the replacement liquid exhaust solenoid valve 23 and the replacement liquid air extraction solenoid valve 24 are in the closed state.

[0062] Among them, the replacement liquid air extraction pump 25 can be replaced by a peristaltic pump, and the replacement liquid exhaust solenoid valve 23 and the replacement liquid air extraction solenoid valve 24 can be replaced by other switch-type components. There are no restrictions on this, as long as the above technical effects can be achieved.

[0063] Please refer to Figure 3 , the waste liquid pipeline 4 includes a waste liquid pipe 41 and a waste liquid exhaust solenoid valve 43. The waste liquid pipe 41 is connected to the top of the waste liquid capacity pot group 3 and is connected to the second internal pipe 42. The waste liquid exhaust solenoid valve 43 is provided on the second internal pipe 42 and is connected to the controller.

[0064] It should be noted that when it is necessary to fill the waste liquid capacity pot group 3 with liquid, the controller controls the replacement liquid exhaust solenoid valve 23 to open so that the replacement liquid pipe 21 is communicated with the replacement liquid capacity pot group 1, and at the same time controls the balance control valve 5 to open, so that the replacement liquid in the replacement liquid capacity pot group 1 is discharged to the waste liquid capacity pot group 3. Since the waste liquid capacity pot group 3 discharges waste liquid by gravity, a single waste liquid exhaust solenoid valve 43 is provided on the second internal pipe 42. By controlling the opening and closing of the waste liquid exhaust solenoid valve 43 by the controller, when it is necessary to discharge the waste liquid in the waste liquid capacity pot group 3, the controller controls the waste liquid exhaust solenoid valve 43 to open, but the waste liquid exhaust solenoid valve 43 is in the closed state throughout the treatment process.

[0065] In the above embodiment, hydrophobic air filters 7 are provided on both the first internal pipe 22 and the second internal pipe 42.

[0066] It is understandable that the replacement fluid pipeline 2 and the waste fluid pipeline 4 are separated, and the opening and closing of the pipelines are respectively controlled by corresponding solenoid valves. At the same time, on one side of the replacement fluid pipeline 2, the replacement fluid pipeline 2 is divided into a replacement fluid exhaust pipeline and a replacement fluid suction pipeline. The replacement fluid exhaust pipeline controls the opening and closing of this liquid path, and the replacement fluid suction pipeline is connected to a small replacement fluid suction pump 25 to increase the liquid level of the replacement fluid capacity pot group 1 through the replacement fluid suction pump 25.

[0067] Among them, since one side of the replacement fluid suction solenoid valve 24, the replacement fluid exhaust solenoid valve 23, the replacement fluid suction pump 25 and the waste fluid exhaust solenoid valve 43 is connected to the atmosphere during the treatment process, two hydrophobic air filters 7 are added to the pressure ports of the replacement fluid capacity pot group 1 and the waste fluid capacity pot group 3 to prevent liquid from flowing into the device interior due to malfunctions during operation.

[0068] Please refer to Figure 4 , the replacement fluid capacity pot group 1 includes a first capacity pot 11 and a second capacity pot 12 for containing dialysis fluid or replacement fluid. The first capacity pot 11 and the second capacity pot 12 are arranged in parallel, and the bottoms of the first capacity pot 11 and the second capacity pot 12 are both connected to the replacement fluid bag, and the tops of the first capacity pot 11 and the second capacity pot 12 are both connected to the first internal pipeline 22.

[0069] It should be noted that when the device starts treatment, the controller controls the first internal pipeline 22 above the first capacity pot 11 and the second capacity pot 12 to close, and first controls the balance control valve 5 below the first capacity pot 11 and the second capacity pot 12 to switch to the first capacity pot 11 first, so that the first capacity pot 11 is connected to the liquid bag, and then controls the power element above the first capacity pot 11 to pump the liquid in the liquid bag into the first capacity pot 11. When the liquid in the first capacity pot 11 reaches the specified liquid level, the controller controls the balance control valve 5 to switch to the second capacity pot 12, so that the second capacity pot 12 is connected to the liquid bag. After pumping the liquid in the liquid bag to the specified liquid level through the power element, the controller controls the power pump to discharge the liquid in the first capacity pot 11. After all the liquid is discharged, the controller controls all the pipelines above the first capacity pot 11 and the second capacity pot 12 to close to start treatment.

[0070] In the above embodiment, liquid level sensors are provided in both the first capacity pot 11 and the second capacity pot 12, and the liquid level sensors are connected to the controller.

[0071] It can be understood that a plurality of liquid level sensors are provided in both the first capacity pot 11 and the second capacity pot 12. Specifically, they can be high liquid level sensors and low liquid level sensors. The high liquid level sensors are arranged at the ports near the top ends of the first capacity pot 11 and the second capacity pot 12, and the low liquid level sensors are arranged at the ports near the bottom ends of the first capacity pot 11 and the second capacity pot 12. When filling the first capacity pot 11 with liquid, the controller controls the replacement liquid extraction solenoid valve 24 and the replacement liquid extraction pump 25 to open, and controls the balance control valve 5 to switch to the state where the first capacity pot 11 is connected to the replacement liquid, and extracts the replacement liquid in the replacement liquid bag into the first capacity pot 11. When the high liquid level sensor in the first capacity pot 11 senses the replacement liquid, it sends a signal to the controller that the liquid level in the first capacity pot 11 has reached the preset position. The controller controls the balance control valve 5 to switch to the state where the replacement liquid bag is connected to the second capacity pot 12, and extracts the replacement liquid in the replacement liquid bag into the second capacity pot 12. When the high liquid level sensor in the second capacity pot 12 senses the replacement liquid, it sends a signal to the controller that the liquid level in the second capacity pot 12 has reached the preset position. The controller controls the balance control valve 5 to close.

[0072] As a preferred embodiment, the waste liquid capacity pot group 3 includes a third capacity pot 31 and a fourth capacity pot 32 for containing waste liquid. The third capacity pot 31 and the fourth capacity pot 32 are arranged in parallel, and the bottoms of both the third capacity pot 31 and the fourth capacity pot 32 are connected to the waste liquid bag, and the tops of both the third capacity pot 31 and the fourth capacity pot 32 are connected to the second internal pipeline 42.

[0073] It should be noted that during the treatment process, the waste liquid needs to be discharged by gravity. The second internal pipeline 42 requires components to control the opening and closing of the waste liquid, and cooperate with the balance control valve 5 to discharge the waste liquid. The four capacity pots are mainly divided into two groups. One group is the replacement liquid capacity pot group 1, and the other group is the waste liquid capacity pot group 3. During the operation of the equipment, this device needs to cooperate with the balance control valve 5 to perform liquid path switching and liquid level adjustment.

[0074] In the above situation, the first capacity pot 11, the second capacity pot 12, the third capacity pot 31, and the fourth capacity pot 32 are of an integrated structure.

[0075] It is understandable that there are four balance control valves 5, which are uniformly controlled by a controller. The four balance control valves 5 are connected to the corresponding first capacity pot 11, second capacity pot 12, third capacity pot 31, and fourth capacity pot 32 to control the conduction of all pipelines. Firstly, there are replacement fluid bags corresponding to the first capacity pot 11 and the second capacity pot 12, and waste fluid bags corresponding to the third capacity pot 31 and the fourth capacity pot 32. At the beginning of the equipment, the controller controls the replacement fluid exhaust solenoid valve 23 corresponding to the first capacity pot 11 and the second capacity pot 12 to close, and controls the replacement fluid air extraction solenoid valve 24 to open. Then, the balance control valve 5 controls the replacement fluid bags corresponding to the first capacity pot 11 and the second capacity pot 12 to be only connected to the first capacity pot 11. The replacement fluid in the replacement fluid bag is extracted by the replacement fluid air extraction pump 25, so that the liquid in the replacement fluid bag enters the first capacity pot 11 through the pipeline below the balance control valve 5. After being filled, the balance control valve 5 is used to control the replacement fluid bag to be conducted to the second capacity pot 12, and the replacement fluid air extraction pump 25 is continued to pump the liquid in the replacement fluid bag into the second capacity pot 12. Then, all the solenoid valves of the replacement fluid pipeline 2 and the waste fluid pipeline 4 are closed after the treatment starts.

[0076] Furthermore, the controller controls the waste fluid exhaust solenoid valve 43 and the replacement fluid exhaust solenoid valve 23 to open, and connects the second capacity pot 12 and the pipeline for external treatment to enter the third capacity pot 31, so that the replacement fluid in the second capacity pot 12 enters the third capacity pot 31 after being used. After the treatment starts, the controller controls all the solenoid valves to close and starts to circulate (before starting the circulation, the first capacity pot 11 and the second capacity pot 12 can be pre-filled with liquid): The external pump pumps the liquid in the replacement fluid bags corresponding to the first capacity pot 11 and the second capacity pot 12 into the second capacity pot 12. At the same time, the liquid in the first capacity pot 11 enters the external treatment pipeline. The liquid in the third capacity pot 31 will enter the waste fluid bags corresponding to the third capacity pot 31 and the fourth capacity pot 32 through the external pump. At the same time, the liquid in the first capacity pot 11 entering the treatment pipeline will enter the fourth capacity pot 32. Continue to circulate: The external pump pumps the liquid in the replacement fluid bags corresponding to the first capacity pot 11 and the second capacity pot 12 into the first capacity pot 11. At the same time, the liquid in the second capacity pot 12 enters the external treatment pipeline. The liquid in the fourth capacity pot 32 will enter the waste fluid bags corresponding to the third capacity pot 31 and the fourth capacity pot 32 through the external pump. At the same time, the liquid in the third capacity pot 31 entering the treatment pipeline will enter the fourth capacity pot 32. In fact, during the treatment process, only one of the first capacity pot 11 and the second capacity pot 12 is filled with replacement fluid, and only one of the third capacity pot 31 and the fourth capacity pot 32 is filled with waste fluid. The balance control valve 5 and the external pump are used to control the flow direction of the liquid in the first capacity pot 11, second capacity pot 12, third capacity pot 31, and fourth capacity pot 32.

[0077] At the end of the treatment, the controller controls the replacement fluid exhaust solenoid valves 23 corresponding to the first capacity pot 11 and the second capacity pot 12 to open. Through the conduction of the external power pump and the balance control valve 5, the liquids in the first capacity pot 11 and the second capacity pot 12 are transferred into the treatment pipeline through the power pump. Then, the controller controls the waste liquid exhaust solenoid valves 43 corresponding to the third capacity pot 31 and the fourth capacity pot 32 to open, and controls the balance control valve 5 to conduct the third capacity pot 31, the fourth capacity pot 32 and the liquid bag, so that the waste liquid in the third capacity pot 31 and the fourth capacity pot 32 is discharged into the waste liquid bag.

[0078] In summary, the capacity pot liquid path switching device provided by the present utility model has a liquid level switching device related to the capacity pot compared with the current CRRT devices on the market, and can match the treatment logic and lightweight requirements of portable CRRT devices. Moreover, the used components are small in volume and light in weight, which is convenient for control and installation.

[0079] In addition to the capacity pot liquid path switching device disclosed in each of the above embodiments, the present utility model also provides a portable blood purification device including the above capacity pot liquid path switching device. This device can control the liquid in the capacity pot pipeline of the supporting consumables through this device in cooperation with the balance control system of the device to realize the treatment logic of the device. At the same time, under the condition of avoiding liquid from entering the liquid path switching device, the weight of the device is reduced, the weight of the device is lightened, and the controllability and assemblability of the device are improved.

[0080] For the structures of other parts of the portable blood purification device, please refer to the prior art and will not be elaborated herein.

[0081] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0082] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0083] The above has introduced in detail a portable blood purification device and a capacity pot liquid path switching device provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A liquid path switching device for a volume pot, characterized in that: include: A replacement fluid capacity pot set (1), used for containing dialysate or replacement fluid, wherein the bottom end of the replacement fluid capacity pot set (1) is connected to a replacement fluid bag; A replacement fluid pipeline (2) is arranged at the top of the replacement fluid volume pot set (1), and the replacement fluid pipeline (2) is used to control the liquid level of the replacement fluid volume pot set (1); A waste liquid capacity pot set (3) for containing waste liquid, wherein the bottom end of the waste liquid capacity pot set (3) is connected to a waste liquid bag; A waste liquid pipeline (4) is arranged at the top of the waste liquid volume pot set (3), and the waste liquid pipeline (4) is used to control the liquid level of the waste liquid volume pot set (3); At least two balancing control valves (5) are provided, and at least two balancing control valves (5) are provided at the bottom ends of the corresponding replacement fluid capacity pot group (1) and the waste fluid capacity pot group (3). The balancing control valves (5) are connected to a controller, and are used to control the opening and closing of the bottom ends of the replacement fluid capacity pot group (1) and the waste fluid capacity pot group (3).

2. The liquid path switching device for a capacity pot according to claim 1, characterized in that: The replacement fluid pipeline (2) comprises: A replacement fluid pipeline (21), the replacement fluid pipeline (21) being connected to the top end of the replacement fluid volume pot set (1), and the replacement fluid pipeline (21) being connected to the first internal pipeline (22); a replacement fluid exhaust solenoid valve (23), arranged in the first internal pipeline (22), the replacement fluid exhaust solenoid valve (23) being connected to the controller; A replacement fluid air extraction solenoid valve (24) is provided in the first internal pipeline (22), and the replacement fluid air extraction solenoid valve (24) is connected to the controller.

3. The liquid path switching device for a capacity pot according to claim 2, characterized in that: The first internal pipeline (22) is provided with a three-way valve (6) for connecting two branches, one of which is provided with the replacement fluid exhaust solenoid valve (23), and the other is provided with the replacement fluid exhaust solenoid valve (24) and a replacement fluid exhaust pump (25) for driving the replacement fluid volume pot group (1) to exhaust liquid, and the replacement fluid exhaust pump (25) is connected to the controller.

4. The liquid path switching device for a capacity pot according to claim 3, characterized in that: The waste liquid pipeline (4) comprises: A waste liquid pipeline (41), the waste liquid pipeline (41) is connected to the top end of the waste liquid capacity pot set (3), and the waste liquid pipeline (41) is connected to the second internal pipeline (42); A waste liquid exhaust solenoid valve (43) is provided in the second internal pipe (42), and the waste liquid exhaust solenoid valve (43) is connected to the controller.

5. The liquid path switching device for a capacity pot according to claim 4, characterized in that: The first internal pipe (22) and the second internal pipe (42) are both provided with a hydrophobic air filter (7).

6. The liquid path switching device for a capacity pot according to claim 5, characterized in that: The replacement fluid volume pot set (1) comprises a first volume pot (11) and a second volume pot (12) for containing dialysate or replacement fluid, the first volume pot (11) and the second volume pot (12) being arranged in parallel, and the bottom ends of the first volume pot (11) and the second volume pot (12) are both connected to the replacement fluid bag, and the top ends of the first volume pot (11) and the second volume pot (12) are both connected to the first internal pipe (22).

7. The liquid path switching device for a capacity pot according to claim 6, characterized in that: The first capacity pot (11) and the second capacity pot (12) are both provided with liquid level sensors, and the liquid level sensors are connected to the controller.

8. The liquid path switching device for a capacity pot according to claim 7, characterized in that: The waste liquid capacity pot set (3) comprises a third capacity pot (31) and a fourth capacity pot (32) for containing waste liquid, the third capacity pot (31) and the fourth capacity pot (32) being arranged in parallel, and the bottom ends of the third capacity pot (31) and the fourth capacity pot (32) are both connected to the waste liquid bag, and the top ends of the third capacity pot (31) and the fourth capacity pot (32) are both connected to the second internal pipe (42).

9. The liquid path switching device for a capacity pot according to claim 8, characterized in that: The first capacity pot (11), the second capacity pot (12), the third capacity pot (31), and the fourth capacity pot (32) are of an integrated structure.

10. A portable blood purification device, characterized in that: It comprises the volumetric pot liquid path switching device as described in any one of claims 1-9.

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