On-site preparation system of B liquid for hemodialysis

Abstract

The B liquid on-site preparation system comprises a water storage tank, a preheating flow path, a liquid storage cavity and a liquid preparation flow path which are connected in sequence, the preheating flow path is used for heating RO reverse osmosis water in the water storage tank to a preset temperature, a B powder container is detachably arranged in the liquid preparation flow path, the water storage tank is arranged at the tail end of the liquid preparation flow path, an outlet of the water storage tank is connected with one end of a first connecting pipe, the other end of the first connecting pipe is detachably connected with the connector, and the connector is connected with the B powder container. When the B liquid preparation system is connected with the dialysis machine to take liquid, the first connecting pipe is not connected with the connector, one end of a B liquid suction pipe of the dialysis machine is inserted into the first connecting pipe, and the other end of the B liquid suction pipe is connected with the dialysis machine; a first water inlet in the top of the water storage tank is used for receiving RO reverse osmosis water, and a water outlet communicated with the preheating flow path is formed in the bottom of the water storage tank and used for preheating water in the water storage tank to a preset temperature.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to an on-site preparation system of B solution for hemodialysis. Background Art

[0002] Hemodialysis is an effective treatment for renal insufficiency. In hemodialysis, blood is sent to a dialysis device together with a dialysate, in which waste and excess water in the blood are removed by a hollow semipermeable membrane assembly using polymer membranes such as cellulose and polysulfone, and the dialyzed blood is returned to the patient. As part of performing dialysis treatment, especially hemodialysis treatment, the dialysate usually uses an acetic acid preparation (A liquid) and a bicarbonate preparation (B liquid). A liquid can usually be provided as a concentrated aqueous solution containing glucose, sodium chloride, potassium chloride, calcium chloride, magnesium chloride, acetic acid, etc., and B liquid can be provided in the form of a concentrated aqueous solution containing sodium bicarbonate, sodium chloride, etc. In view of this, the above-mentioned liquid concentrate is usually provided in a canned form, with the disadvantage that it is relatively complicated and heavy to carry, and the transportation and storage costs are relatively large.

[0003] Due to the above problems, alkaline concentrates (B powder) are usually used, which are mostly in the form of dry concentrates consisting of or containing bicarbonate. The concentrate is located in a container such as a bag or a cartridge connected to the dialysis machine, and a saturated solution consisting of or containing bicarbonate is subsequently prepared from the dry concentrate by supplying high-purity water.

[0004] At present, when performing hemodialysis treatment, online B powder (centralized liquid supply) is usually used. The B powder is contained in a bag or a cylinder. When used, high-purity water needs to be mixed with the B powder to form an alkaline saturated solution. Summary of the invention

[0005] The utility model aims to provide an on-site B solution preparation system for hemodialysis. The B solution on-site preparation system is separated from the dialysis machine during the preparation process and is transported to the dialysis machine after preparation. This can solve the problems that the pre-prepared B solution cannot be stored for a long time and is prone to contamination, and can achieve ready-to-use preparation.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A B liquid on-site preparation system comprises a water storage tank, a preheating flow path, a liquid storage cavity and a liquid preparation flow path connected in sequence; the preheating flow path is used to heat the RO reverse osmosis water in the water storage tank to a preset temperature, a B powder container is detachably provided in the liquid preparation flow path, and the end of the liquid preparation flow path is the water storage tank, the outlet of the water storage tank is connected to one end of a first connecting pipe, the other end of the first connecting pipe is detachably connected to a joint, and when the B liquid preparation system is connected to a dialyzer to take liquid, the first connecting pipe is not connected to the joint, one end of the B liquid suction pipe of the dialyzer is inserted into the first connecting pipe, and the other end of the B liquid suction pipe is connected to the dialyzer; the first water inlet at the top of the water storage tank is used to connect the RO reverse osmosis water, and a water outlet is provided at the bottom of the water storage tank to connect to the preheating flow path, which is used to preheat the water inside the water storage tank to a preset temperature;

[0008] The preheating flow path is the water outlet of the water storage tank, the water pump, the heating valve, the heating module and the second water inlet which are connected in sequence through pipelines;

[0009] Two branches are also arranged between the water pump and the heating valve, namely a flushing branch and a liquid distribution path. The flushing branch is a flushing valve and a joint connected in sequence through pipelines, and at this time, the first connecting pipe is connected to the joint; the liquid distribution path is a liquid distribution valve, an exhaust unit, a B powder container, a liquid storage chamber and a first connecting pipe connected in sequence through pipelines, and the exhaust unit is used to exhaust air from the B powder container.

[0010] Furthermore, the B liquid preparation system also includes a control module and a sensor module, the sensor module includes a first liquid level sensor, a second liquid level sensor, a pressure sensor and a liquid flow sensor; the first liquid level sensor and the second liquid level sensor are located in the water storage tank, and the first liquid level sensor is higher than the second liquid level sensor, and the pressure sensor is located in the liquid storage cavity; the liquid flow sensor is located in the exhaust unit, and each sensor is electrically connected to the control module;

[0011] The control module is used to control the opening or closing of the water pump and valve of the preheating flow path and the liquid distribution flow path according to the numerical value of the sensor module.

[0012] Furthermore, the exhaust unit includes an exhaust valve and a liquid flow sensor, the liquid flow sensor and the exhaust valve are sequentially connected to the pipeline between the liquid dispensing valve and the B powder container, and the liquid flow sensor is used to detect whether there is liquid flowing through the pipeline.

[0013] Furthermore, one end of the two ends of the B powder container is connected to the exhaust unit and the other end is connected to the liquid storage chamber. The B powder container is a movable independent part, including a dry powder bag, a bracket and a cover body; the dry powder bag is made of disposable flexible material; the cover body is welded to the top and bottom of the dry powder bag respectively, so that the cover body and the dry powder bag are connected to form a chamber, and sodium bicarbonate particles are placed in the chamber to allow the liquid in the liquid inlet pipe to flow through the cover body and the dry powder bag and then flow out from the liquid outlet pipe; the bracket is detachably connected to the cover body, and is used to longitudinally support the dry powder bag made of flexible material on the bracket, and assist in supporting the B powder container.

[0014] Furthermore, a disinfectant liquid inlet is also provided on the top of the water storage tank, and the disinfectant liquid inlet is connected to an external disinfectant liquid generating device through a pipeline to generate a disinfectant solution.

[0015] Furthermore, the preheating flow path of the water injection and heating stage of the B liquid on-site preparation system includes: water in the water storage tank is circulated and heated through the water outlet, the forward-operating water pump, the heating valve, the heating module and the second water inlet.

[0016] Furthermore, the water pump is a peristaltic pump. When the gas in the B powder container needs to be discharged, the gas in the B powder container is discharged into the water storage tank through the exhaust unit, the liquid dispensing valve, and the reverse-operating water pump.

[0017] Furthermore, the flow path of the liquid dispensing stage includes: the heated water in the water storage tank 5 passes through the water outlet, the forward-operating water pump, the liquid dispensing valve, the exhaust unit, and the B powder container to reach the liquid storage chamber.

[0018] Furthermore, when the B liquid on-site preparation system takes liquid, one end of the B liquid aspiration tube of the dialysis machine is inserted into the first connecting tube, and the other end of the B liquid aspiration tube is connected to the dialysis machine.

[0019] Compared with the prior art, the beneficial effects brought by the technical solution of the utility model are:

[0020] The on-site preparation system for B liquid for hemodialysis described in the utility model can directly install the B powder bag in the on-site preparation system for B liquid when preparation is needed, so that on-site preparation can be achieved and it can be used immediately after preparation, thus avoiding the multiple contamination risks such as preparation and filling in advance in the prior art, and ensuring the purity and quality of B liquid;

[0021] Moreover, the system preheats the water temperature in advance so that the water temperature entering the B powder container meets the optimal water temperature for dissolving the B powder container, thereby achieving a better dissolution effect;

[0022] The system realizes water preheating, liquid preparation and post-use disinfection by opening / closing multiple valve bodies, integrating the liquid preparation and disinfection functions into one, providing an integrated solution with multiple functions, simplifying the operating process and improving work efficiency; in particular, the disinfection function is integrated to ensure the hygienic safety of pipelines and equipment and protect the health and safety of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the on-site preparation system of liquid B;

[0024] Figure 2 It is a schematic diagram of the B solution on-site preparation system connected to the B solution aspiration tube of the dialysis machine.

[0025] In the figure:

[0026] 1: First liquid level sensor; 2: Second liquid level sensor; 3: Pressure sensor;

[0027] 4: water inlet valve; 5: water storage tank; 6: overflow port; 7: water pump; 8: heating module; 9: heating valve;

[0028] 10: Liquid dispensing valve; 11: Flushing valve; 12: Exhaust valve; 13: Liquid flow sensor; 14: B powder container;

[0029] 15: liquid storage chamber; 16: first connecting pipe; 18: joint; 19: disinfectant liquid generator;

[0030] 20: first water inlet; 21: drain valve; 22: disinfectant inlet; 23: exhaust unit; 24: water outlet;

[0031] 25: Second water inlet. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme, beneficial effects and significant progress of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model is clearly and completely described below in combination with the drawings provided in the examples of the utility model. Obviously, all the described embodiments are only partial embodiments of the utility model, rather than all embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] In the description of this application, unless otherwise clearly specified and limited, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; unless otherwise specified or explained, the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] like Figure 1 As shown, a B liquid on-site preparation system includes a water storage tank 5, a liquid storage chamber 15, an exhaust unit, a B powder container 14, a preheating flow path, a liquid preparation flow path, a control module and a sensor module. The water storage tank 5, the exhaust unit, the B powder container 14 and the liquid storage chamber 15 are connected in sequence through pipelines, and the control module is electrically connected to the sensor module. The B powder container 14 is a disposable dry powder cartridge, which is detachably connected and installed in the B liquid preparation system.

[0035] The sensing module includes a first liquid level sensor 1, a second liquid level sensor 2, a pressure sensor 3 and a liquid flow sensor 13. The first liquid level sensor 1 and the second liquid level sensor 2 are located in the water storage tank 5 and are used to measure whether the liquid level has reached its position. When the liquid level reaches the position of the liquid level sensor, a signal is sent to the control module, and the first liquid level sensor 1 is higher than the second liquid level sensor 2; the pressure sensor 3 is located in the liquid storage chamber 15 and is used to transmit the pressure in the liquid storage chamber 15 to the control module in real time, and the liquid flow sensor 13 is located in the exhaust unit.

[0036] The control module is used to control the opening or closing of the water pump and valve of the preheating flow path and the liquid distribution flow path according to the numerical value of the sensor module.

[0037] The water storage tank 5 has a first water inlet 20 and a disinfectant inlet 22 at the top, an overflow port 6 and a second water inlet 25 at the opposite side walls, and a water outlet 24 at the bottom. The first water inlet 20 is connected to the water inlet valve 4 and the RO reverse osmosis water pipeline in sequence through a pipeline; the disinfectant inlet 22 is connected to an external disinfectant generator 19 through a pipeline. The disinfectant generator 19 in this embodiment is a slightly acidic hypochlorous acid generator for producing slightly acidic hypochlorous acid solution. The overflow port 6 is provided at the position of the water storage tank 5 corresponding to the side wall where the water storage tank accommodates 10L, and a pipeline is provided at the overflow port 6 to connect to the external drainage port.

[0038] The preheating flow path is the water outlet 24 of the water storage tank 5, the water pump 7, the heating valve 9, the heating module 8 and the second water inlet 25 which are connected in sequence through pipelines. A temperature sensor is arranged in the heating module, and the temperature sensor is electrically connected to the control module. The water pump 7 is a peristaltic pump which can realize forward and reverse operation.

[0039] Two branches are also arranged between the water pump 7 and the heating valve 9, namely a flushing branch and a liquid distribution flow path. The flushing branch is a flushing valve 11 and a connector 18 connected in sequence through pipelines; the liquid distribution flow path is a liquid distribution valve 10, an exhaust unit 23, a B powder container 14, a liquid storage chamber 15 and a first connecting pipe 16 connected in sequence through pipelines; the exhaust unit includes an exhaust valve 12 and a liquid flow sensor 13, and the liquid flow sensor 13 and the exhaust valve 12 are connected in sequence on the pipeline between the liquid distribution valve 10 and the B powder container 14, and the liquid flow sensor 13 is used to detect whether there is liquid flowing through the pipeline.

[0040] The B powder container 14 is a commercially available B powder bag, which is a movable independent part, including a dry powder bag, a bracket and a cover; the dry powder bag is made of disposable flexible material; the cover is welded to the top and bottom of the dry powder bag respectively, so that the cover and the dry powder bag are connected to form a chamber, and sodium bicarbonate particles are placed in the chamber to allow the liquid in the liquid inlet pipe to flow through the cover and the dry powder bag and then flow out from the liquid outlet pipe; the bracket is detachably connected to the cover, and is used to support the flexible dry powder bag longitudinally on the bracket, and assist in supporting the B powder container 14. The two ends of the B powder container 14 are connected to the exhaust unit 23 at one end and the liquid storage chamber 15 at the other end.

[0041] The bottom of the liquid storage chamber 15 is provided with a drain port, and the drain port is connected to the drain valve 21 through a pipeline.

[0042] One end of the first connecting tube 16 is connected to the liquid storage chamber 15, and the other end is detachably connected to the connector 18. When the first connecting tube 16 is not connected to the connector 18, one end of the B liquid aspiration tube of the dialyzer can be inserted, and the other end of the B liquid aspiration tube is connected to the dialyzer.

[0043] When in use, the working process of the B liquid on-site preparation system is as follows:

[0044] In the water injection and heating stage: the water inlet valve 4 is opened, and the other valves and the water pump remain closed; the RO reverse osmosis water flows into the water storage tank 5 through the water inlet valve 4 and the first water inlet 20, until the first liquid level sensor 1 measures the liquid level, and the control module controls the water inlet valve 4 to close; then the water pump 7 runs forward, and the heating valve 9 and the heating module 8 are opened, and the heating temperature of the heating module 8 is set to 38°; the water in the water storage tank 5 is circulated and heated in the preheating flow path through the water outlet 24, the water pump 7, the heating valve 9, the heating module 8 and the second water inlet 25, until the temperature sensor in the heating module detects that the water temperature therein reaches 30°, then the circulating heating is stopped, and the heating valve 9 and the heating module 8 are closed;

[0045] Liquid preparation stage: connect the two ends of the B powder container 14 to the exhaust unit and the liquid inlet of the liquid storage chamber 15 respectively; the water pump is a peristaltic pump, open the liquid preparation valve 10, and the water pump 7 rotates in the opposite direction to discharge the gas in the B powder container 14 until the pressure sensor 3 detects that the pressure is lower than -0.1mPa, and then stops the water pump 7;

[0046] Then, the water pump 7 is turned on in the forward direction, and the liquid dispensing valve 10 and the drain valve 21 of the liquid dispensing flow path are opened. The heated water flows from the bottom of the water storage tank 5 through the water pump 7, the liquid dispensing valve 10, the exhaust unit 23, and the B powder container 14 in sequence. After the water flows into the cover body at the top of the B powder container 14, the B powder located in the upper part thereof is mixed with the injected reverse osmosis water, and the B powder in the lower space of the B powder container 14 is gradually mixed and dissolved with the reverse osmosis water as it flows downward. The solution discharged at the beginning does not form a saturated solution, so that the unsaturated solution flows out from the end of the cover body located at the lower part of the B powder container 14, and then flows into the liquid storage chamber 15 through the pipeline and is discharged from the drain valve 21; after flowing out for 3-5 minutes, the concentration of the sodium bicarbonate solution in the B powder container 14 gradually changes from top to bottom to the concentration of the saturated solution (B liquid), and the drain valve 21 is closed; at this time, the liquid only flows through the exhaust unit 23, and the exhaust valve 12 does not work.

[0047] The value of the pressure sensor 3 located in the liquid storage chamber 15 is detected until the water pressure is in the range of 0.01-0.03mPa, which meets the liquid supply range of the dialysis machine, and the liquid dispensing valve 10 and the water pump 7 remain open; if the water pressure is higher than 0.03mPa, the water pump 7 is turned off; the liquid dispensing is completed.

[0048] Liquid collection stage: insert the end of the first connecting tube 16 into one end of the B liquid suction tube of the dialyzer, and the other end of the B liquid suction tube is connected to the dialyzer (such as Figure 2 As shown), connect the patient to the dialysis machine and start supplying fluid to the dialysis machine;

[0049] When the pressure value of the pressure sensor 3 is lower than 0.01 mPa, the water pump 7 is started and the process returns to the liquid preparation stage, and the liquid preparation and liquid collection stages are repeated until the patient completes dialysis.

[0050] After completing multiple dialysis sessions, the operator disinfects the B solution preparation system. The disinfection process is as follows:

[0051] First, the water inlet valve 4 is opened. When water flows to the first liquid level sensor 1, the control module controls the water inlet valve 4 to close. Then, the external disinfectant generating device 19 prepares slightly acidic hypochlorous acid, which enters the water storage tank 5 containing water from the disinfectant inlet 22. At this time, the mixed slightly acidic hypochlorous acid solution flows through the preheating flow path (the heating module is not started, but only flows through the heating module) for circulation.

[0052] After the predetermined circulation time, the heating valve 9 and the heating module 8 are closed; the connector 18 is connected to one end of the first connecting pipe 16, the water pump 7 is kept open in the forward direction, the flushing valve 11 and the exhaust valve 12 are opened, and the mixed slightly acidic hypochlorous acid solution flows from the bottom of the water storage tank 5 through the water pump 7, the flushing valve 11, the connector 18, the first connecting pipe 16, the liquid storage chamber 15, the B powder container 14, and the exhaust unit 23 in sequence until the liquid flow sensor 13 detects water and stops running;

[0053] Then, the flushing valve 11 and the exhaust valve 12 are closed; then, the liquid dispensing valve 10 and the drain valve 21 are opened, so that the mixed slightly acidic hypochlorous acid solution flows from the bottom of the water storage tank 5 through the water pump 7, the liquid dispensing valve 10, the exhaust unit 23, the B powder container 14, the liquid storage chamber 15 in sequence, and then is discharged through the drain valve 21;

[0054] After a predetermined time has passed, the dispensing valve 10 and the exhaust valve 12 are closed, the connector 18 is connected to the first connecting pipe 16, the flushing valve 11 and the drain valve 21 are opened, so that the mixed slightly acidic hypochlorous acid solution flows from the bottom of the water storage tank 5 through the water pump 7, the flushing valve 11, the connector 18, the first connecting pipe 16, the liquid storage chamber 15 in sequence, and then is discharged through the drain valve 21 until there is no liquid in the water storage tank 5.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A B liquid on-site preparation system, characterized in that The invention comprises a water storage tank (5), a preheating flow path, a liquid storage chamber (15) and a liquid distribution flow path which are connected in sequence; the preheating flow path is used to heat the RO reverse osmosis water in the water storage tank to a preset temperature; a B powder container (14) is detachably provided in the liquid distribution flow path; the end of the liquid distribution flow path is the water storage tank (5); the outlet of the water storage tank (5) is connected to one end of a first connecting pipe (16); the other end of the first connecting pipe (16) is detachably connected to a joint (18); When the B liquid preparation system is connected to a dialysis machine for liquid extraction, the first connecting tube (16) is not connected to the joint (18), one end of the B liquid suction tube of the dialysis machine is inserted into the first connecting tube (16), and the other end of the B liquid suction tube is connected to the dialysis machine; the first water inlet (20) at the top of the water storage tank (5) is used to receive RO reverse osmosis water, and the bottom of the water storage tank (5) is provided with a water outlet (24) connected to a preheating flow path, which is used to preheat the water inside the water storage tank (5) to a preset temperature; The preheating flow path is a water outlet (24) of the water storage tank (5), a water pump (7), a heating valve (9), a heating module (8) and a second water inlet (25) which are sequentially connected through pipelines; Two branches are also provided between the water pump (7) and the heating valve (9), namely a flushing branch and a liquid distribution flow path. The flushing branch is a flushing valve (11) and a joint (18) connected in sequence through a pipeline, and the first connecting pipe (16) is connected to the joint (18); the liquid distribution flow path is a liquid distribution valve (10), an exhaust unit (23), a B powder container (14), a liquid storage chamber (15) and a first connecting pipe (16) connected in sequence through a pipeline, and the exhaust unit is used to exhaust air from the B powder container.

2. The on-site preparation system of liquid B according to claim 1, characterized in that: The B liquid preparation system further comprises a control module and a sensor module, wherein the sensor module comprises a first liquid level sensor (1), a second liquid level sensor (2), a pressure sensor (3) and a liquid flow sensor (13); the first liquid level sensor (1) and the second liquid level sensor (2) are located in the water storage tank (5), and the first liquid level sensor (1) is higher than the second liquid level sensor (2); the pressure sensor (3) is located in the liquid storage chamber (15); the liquid flow sensor (13) is located in the exhaust unit, and each sensor is electrically connected to the control module; The control module is used to control the opening or closing of the water pump and valve of the preheating flow path and the liquid distribution flow path according to the numerical value of the sensor module.

3. The on-site preparation system of liquid B according to claim 1, characterized in that: The exhaust unit comprises an exhaust valve (12) and a liquid flow sensor (13), wherein the liquid flow sensor (13) and the exhaust valve (12) are sequentially connected to a pipeline between the liquid dispensing valve (10) and the B powder container (14), and the liquid flow sensor (13) is used to detect whether liquid flows through the pipeline.

4. The on-site preparation system of liquid B according to claim 1, characterized in that: The two ends of the B powder container (14) are connected to the exhaust unit (23) at one end and to the liquid storage chamber (15) at the other end. The B powder container (14) is a movable independent part, comprising a dry powder bag, a bracket and a cover body; the dry powder bag is made of disposable flexible material; the cover body is respectively welded to the top and bottom of the dry powder bag, so that the cover body and the dry powder bag are connected to form a chamber, and sodium bicarbonate particles are placed in the chamber to allow the liquid in the liquid inlet pipe to flow through the cover body and the dry powder bag and then flow out from the liquid outlet pipe; the bracket is detachably connected to the cover body, and is used to longitudinally support the dry powder bag made of flexible material on the bracket, and to assist in supporting the B powder container (14).

5. The on-site preparation system of liquid B according to claim 1, characterized in that: The top of the water storage tank (5) is also provided with a disinfectant liquid inlet (22), and the disinfectant liquid inlet (22) is connected to an external disinfectant liquid generating device (19) through a pipeline for generating a disinfectant solution.

6. The on-site preparation system of liquid B according to claim 1, characterized in that: The preheating flow path of the water injection and heating stage of the B liquid on-site preparation system comprises: water in the water storage tank (5) is circulated and heated through the water outlet (24), the forward-operating water pump (7), the heating valve (9), the heating module (8) and the second water inlet (25).

7. The on-site preparation system of liquid B according to claim 1, characterized in that: The water pump (7) is a peristaltic pump. When the gas in the B powder container (14) needs to be discharged, the gas in the B powder container (14) is discharged into the water storage tank (5) through the exhaust unit (23), the liquid dispensing valve (10), and the reverse-operating water pump (7).

8. The on-site preparation system of liquid B according to claim 7, characterized in that: The flow path of the liquid dispensing stage comprises: the heated water in the water storage tank (5) passes through the water outlet (24), the forward-operating water pump (7), the liquid dispensing valve (10), the exhaust unit (23), the B powder container (14), and reaches the liquid storage chamber (15).

9. The on-site preparation system of liquid B according to claim 7, characterized in that: When the B liquid on-site preparation system takes liquid, one end of the B liquid aspiration tube of the dialysis machine is inserted into the first connecting tube (16), and the other end of the B liquid aspiration tube is connected to the dialysis machine.

Images