Liquid preparation system and liquid preparation method

Abstract

This invention relates to the field of medical device technology and discloses a solution preparation system and method. The solution preparation system includes a first interface, a second interface, a solution preparation module, a volume restoration module, and a volume control module. The solution preparation module includes at least one dispensing device with an inner cavity. An elastic partition is provided within the inner cavity to divide it into a solution preparation chamber and a control chamber. Multiple protrusions are provided on the side of the elastic partition near the solution preparation chamber and / or on the sidewall of the solution preparation chamber facing the elastic partition. The bottom of the solution preparation chamber communicates with the first interface, and the top of the solution preparation chamber communicates with the second interface. An inlet for supplying solvent and an outlet for discharging solution are provided between the solution preparation chamber and the second interface. The volume restoration module communicates with the control chamber and is used to discharge fluid from the control chamber. The volume control module communicates with the control chamber and is used to inject fluid into the control chamber. This invention solves the problem in the prior art where the built-in dissolution chamber of the device is inconvenient to change the solution preparation volume, thus failing to meet the accuracy requirements for the volume of water used in solution preparation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a solution preparation system and solution preparation method. Background Technology

[0002] In hemodialysis treatment, dialysate is a crucial medium for removing metabolic waste from the patient's body and maintaining electrolyte and acid-base balance. Dialysis solution is prepared by mixing and diluting concentrate A, concentrate B, and dialysis water in a specific ratio. Concentrates are supplied in three ways: in containers, through centralized supply systems, and via dry powder inline preparation. Concentrate B contains fewer components, typically only sodium bicarbonate, with small amounts of sodium chloride and glucose added in some cases. When using dry powder inline preparation, only a small amount needs to be continuously dissolved to form a saturated sodium bicarbonate solution. Concentrate A, on the other hand, contains more components, primarily sodium chloride, but also includes calcium chloride, magnesium chloride, potassium chloride, glacial acetic acid, or citric acid, etc. Different components have different solubilities, making dry powder inline preparation more complex.

[0003] In existing technology, the solution preparation volume of online A dry powder includes the volume of the built-in dissolution chamber, the volume of the dry powder cartridge consumable installed outside the equipment, and the volume of the pipeline connecting the dissolution chamber and the dry powder cartridge. Dialysis water circulates in the direction of "bottom of dry powder cartridge → inside dry powder cartridge → top of dry powder cartridge → bottom of dissolution chamber → inside dissolution chamber → top of dissolution chamber → bottom of dry powder cartridge" until the solute is completely dissolved, thereby producing solution A.

[0004] In existing technologies, the dissolution chamber and the connecting pipe between the dissolution chamber and the dry powder cartridge have constant volumes. However, to meet the dialysis prescription requirements of different patients, different models of dry powder cartridges contain different formulations and qualities of dry powder A, resulting in different required volumes of dialysis water for solution preparation. Although the volumes of dry powder A cartridges may vary, they are insufficient to meet the needs of dry powder A preparation. Currently, the built-in dissolution chamber of the equipment does not facilitate changing the solution preparation volume and cannot meet the requirement of precise volumetric accuracy of the water used for solution preparation to ensure the accuracy of the concentration of dry powder A. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the built-in dissolution chamber of the existing equipment is not convenient to change the liquid preparation volume, and cannot meet the accuracy requirements of the water volume for liquid preparation.

[0006] To address the aforementioned technical problems, the present invention provides a liquid preparation system, comprising: First interface; Second interface; The liquid preparation module includes at least one liquid preparer, each liquid preparer having an inner cavity, and an elastic partition is provided in the inner cavity to divide the inner cavity into a liquid preparation chamber and a control chamber; The elastic separator has multiple protrusions on the side near the liquid dispensing chamber and / or on the side wall of the liquid dispensing chamber facing the elastic separator; The bottom of the solution mixing chamber is connected to the first interface, and the top of the solution mixing chamber is connected to the second interface. An inlet for supplying solvent and an outlet for discharging solution are provided between the solution mixing chamber and the second interface. The volume restoration module, connected to the control chamber, is used to discharge the fluid inside the control chamber to reduce its volume. The volume control module, connected to the control cavity, is used to inject fluid into the control cavity to increase its volume.

[0007] Preferably, the volume restoration module includes a second pump body, the inlet of the second pump body is connected to the control chamber, and a first valve is provided between the inlet of the second pump body and the control chamber.

[0008] Preferably, the volume control module includes a first balancing chamber and a second balancing chamber, the first balancing chamber including chamber A and chamber B, and the second balancing chamber including chamber C and chamber D; Both chamber A and chamber C are connected to the control chamber and the outlet of the second pump body. A second valve is provided between chamber A and the control chamber, a sixth valve is provided between chamber C and the control chamber, a third valve is provided between chamber A and the outlet of the second pump body, and a seventh valve is provided between chamber C and the outlet of the second pump body. Both chambers B and D are connected to the inlet and the inlet of the second pump body. A fourth valve is installed between chamber B and the inlet, an eighth valve is installed between chamber D and the inlet, a fifth valve is installed between chamber B and the inlet of the second pump body, and a ninth valve is installed between chamber D and the inlet of the second pump body.

[0009] Preferably, the elastic separator is an elastic bag body, the bottom of the liquid dispenser is provided with a third interface and a fifth interface, the top of the liquid dispenser is provided with a fourth interface, the third interface is connected to the internal space of the elastic bag body, the fourth interface is connected to the internal space of the elastic bag body / the space between the elastic bag body and the liquid dispenser, and the fifth interface is connected to the space between the elastic bag body and the liquid dispenser. The internal space of the elastic bag is a regulating cavity. The volume restoration module and the volume control module are both connected to the third interface, the first interface is connected to the fifth interface, the fourth interface is connected to the second interface, and the space between the elastic bag and the liquid dispenser is connected. Alternatively, if the internal space of the elastic bag is a liquid dispensing chamber, then the first interface is connected to the third interface, the volume restoration module and the volume control module are both connected to the fifth interface, and the fourth interface is connected to the second interface and the internal space of the elastic bag.

[0010] Preferably, the top of the liquid dispenser is also provided with a sixth interface, which is connected to the space between the elastic bag and the liquid dispenser, and the fourth interface is connected to the internal space of the elastic bag. The internal space of the elastic bag is a regulating cavity. The volume restoration module is connected to the third interface, the volume control module is connected to the fourth interface, and the sixth interface is connected to the second interface. Alternatively, the internal space of the elastic bag can be used as a liquid dispensing chamber, with the volume restoration module connected to the fifth interface, the volume control module connected to the sixth interface, and the fourth interface connected to the second interface.

[0011] Preferably, the elastic separator is a vertically arranged elastic diaphragm.

[0012] This invention provides a solution preparation method using the above-mentioned solution preparation system, comprising the following steps: S1, the first interface and the second interface are respectively connected to the container cylinder to form a connection loop between the container cylinder and the liquid dispensing chamber; S2. The volume restoration module and volume control module adjust the volume of fluid in the control chamber to make the liquid dispensing chamber reach the target volume. S3. Introduce solvent through the inlet so that the solvent flows sequentially through the container and the dispensing chamber. Stop introducing solvent after the dispensing chamber is full. S4. Drives the solvent to circulate along the connecting loop; S5. When the solution in the circuit to be connected reaches the target concentration, the solution is supplied through the outlet.

[0013] Preferably, in step S2, the volume restoration module and the volume control module adjust the volume of the fluid in the regulating cavity to make the liquid dispensing cavity reach the target volume, specifically: S21. Open the first valve, start the second pump body, drain the fluid in the air conditioning control chamber, and then close the first valve; S22. Open the third, fifth, sixth and eighth valves to supply water to chamber D through the inlet. Water from chamber C flows into the control chamber. The second pump body draws water from chamber B into chamber A. S23. Close the third, fifth, sixth and eighth valves, and simultaneously open the second, fourth, seventh and ninth valves to supply water to chamber B through the inlet. Water from chamber A flows into the control chamber, and the second pump body draws water from chamber D into chamber C. S24. Repeat steps S22 to S23 until the water flowing into the control chamber reaches the preset volume.

[0014] Preferably, if the volume of fluid pushed into the control cavity is the target volume for volume control, then: Target volume of controlled volume = volume of balance chamber V * number of push chambers = volume of liquid per unit valve push * total number of push chamber pushes; The total number of times the valve body pushes the liquid is the sum of the number of times the fourth valve and the eighth valve are jogged, or the sum of the number of times the second valve and the sixth valve are jogged. The volume of liquid per unit jog of the valve = the volume of the balance chamber V / the total number of jogs when the valve body passes through a volume V of liquid; Jogging speed = Unit jogging liquid volume / Jogging interval duration.

[0015] Preferably, a disinfection inlet and a disinfection outlet are provided between the second interface and the liquid preparation chamber; Solution preparation methods also include: S6. After the solution is drained or before re-preparing the solution, the solution preparation chamber shall be disinfected, specifically as follows: S61. Execute step S2 until the control cavity reaches its maximum volume; S62. Disinfectant and water are injected through the disinfection inlet and water inlet respectively. The water and disinfectant are mixed to form a disinfectant solution. The water is stopped after the disinfectant solution fills the solution mixing chamber. S63, drives the disinfectant to circulate along the connection loop; S64. After the preset time is reached, the disinfectant solution is discharged from the disinfection outlet.

[0016] Compared with the prior art, the liquid preparation system and method of the present invention have the following advantages: This invention discloses a liquid preparation system in which an elastic partition is provided within the inner cavity of the liquid dispenser, dividing the inner cavity into a liquid preparation chamber and a control chamber. A volume restoration module and a volume control module respectively draw and inject preset volumes of fluid into the control chamber, thereby driving the elastic partition to deform towards either the control chamber or the liquid preparation chamber. This causes the volume of the control chamber to decrease or increase by the preset volume, and consequently, the volume of the liquid preparation chamber to increase or decrease by the preset volume, achieving a target volume and thus enabling precise adjustment of the liquid preparation chamber volume. This invention overcomes the limitation in existing technologies where the liquid preparation volume is determined by the dry powder container and the dissolving chamber. It allows for flexible adjustment of the liquid preparation chamber volume according to the requirements of containers with different dry powder contents, ensuring that the solvent volume meets dilution requirements and thus producing the target solution. This solves the problem in existing technologies where the built-in dissolving chamber is inconvenient to change the liquid preparation volume, failing to meet the accuracy requirements for liquid preparation water volume.

[0017] In a solution preparation method of the present invention, step S2 calculates the target volume of the solution preparation chamber based on the current volume of the container and the dilution volume, and adjusts the volume of the solution preparation chamber to the target volume through a volume restoration module and a volume control module, achieving precise matching between the volume of the prepared water and the dry powder, ensuring the accuracy of the solution concentration from the beginning of the process; step S3 determines the solvent addition by judging whether the solvent fills the solution preparation chamber, avoiding concentration deviations caused by excessive or insufficient solvent, further improving the accuracy of the solution concentration; step S4 drives the solvent to circulate, accelerating the dissolution of the dry powder and homogenizing the solution concentration, avoiding local concentration unevenness; in step S5, the dry powder is completely dissolved in a fixed volume of solvent, and the resulting solution concentration will necessarily reach the preset target value. The solution preparation method of the present invention has a clear process and controllable steps, effectively avoiding the abnormal concentration caused by the inability to precisely control the volume and insufficient dissolution in existing solution preparation processes, and improving the versatility and standardization of solution preparation operations.

[0018] In summary, the solution preparation system and method of the present invention are suitable for the personalized needs of different patients for solution formulation in clinical practice, and solve the problem that the built-in dissolution chamber of the existing equipment is not convenient to change the solution preparation volume and cannot meet the accuracy requirements of the water volume for solution preparation. Attached Figure Description

[0019] Figure 1 This is a diagram of the solution preparation system according to the first embodiment of the present invention; Figure 2 This is the first embodiment of the present invention. Figure 1 Enlarged view of point A; Figure 3 This is a schematic diagram of the second elastic diaphragm according to the first embodiment of the present invention; Figure 4 This is a diagram of the solution preparation system according to the second embodiment of the present invention; Figure 5 This is a schematic diagram of the liquid dispensing device according to the second embodiment of the present invention; Figure 6 This is the second embodiment of the present invention. Figure 5 Enlarged view of point B; Figure 7 This is the second embodiment of the present invention. Figure 5 Enlarged view of point C; Figure 8 This is a diagram of the solution preparation system according to the third embodiment of the present invention; Figure 9 This is a schematic diagram of the liquid preparation device according to the third embodiment of the present invention.

[0020] In the diagram, 1 is the container; 2 is the liquid dispensing module; 21 is the liquid dispenser; 21a is the inner cavity; 211a is the liquid dispensing chamber; 2111a is the second opening; 2112a is the first opening; 212a is the control chamber; 21b is the elastic partition; 21c is the protrusion; 3 is the first pump body; 4 is the volume control module; 41 is the second pump body. 411a, Pressure detector; 41b, First valve; 41d, Tenth valve; 41f, Third water valve; 42, First balancing chamber; 421, Chamber A; 421b, Second valve; 421d, Third valve; 422, Chamber B; 422b, Fourth valve; 422d, Fifth valve; 43, Second balancing chamber; 431, Chamber C; 431b, Sixth valve; 431d, Seventh valve; 432, Chamber D; 432b, Eighth valve; 432d, Ninth valve; 5, Connecting circuit; 51, First water pipe; 52, Second water pipe; 531, Inlet valve; 541, Third pump body; 55. Liquid detector; 56. Exhaust valve; 581. Water outlet valve; 582. Fourth pump body; 59. First water valve; 60. Second water valve; 6. First sealing element; 61. Sealing body; 61a. First channel; 61b. Second channel; 61c. First connecting pipe; 62. Hollow nut; 63. First sealing ring; 7. Second sealing element; 81. Fourth water valve; 82. Fifth water valve; 10. Connecting pipeline; 121. Eighth water valve; 13. Third sealing element; 131. Plug; 131a. Mounting groove; 131b. Fourth channel; 132. Second sealing ring. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer" and other terms used in this invention to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] It should be understood that the terms "first," "second," etc., are used in this invention to describe various types of information, but these terms are not limited to them; they are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] First embodiment of the invention: like Figures 1 to 9 As shown, a preferred embodiment of the liquid preparation system of the present invention includes a first interface, a second interface, a liquid preparation module 2, a volume restoration module, and a volume control module 4. The liquid preparation system of this embodiment is not only applicable to the preparation of solution A, but can also be applied to the preparation of other solutions. For ease of description, the preparation of solution A will be used as an example in the following description.

[0026] like Figure 1 As shown, the first and second interfaces are used to connect to the container 1 containing the solute. The first interface is connected to the top of the container 1, and the second interface is connected to the bottom of the container 1. The container 1 is detachable, and the first and second interfaces are interconnected. The dry powder required for preparing solution A is stored inside the container 1.

[0027] like Figure 1 As shown, the solution preparation module 2 includes at least one solution preparer 21. Each solution preparer 21 has an inner cavity 21a, and an elastic partition 21b is provided inside the inner cavity 21a to divide the inner cavity 21a into a solution preparation chamber 211a and a control chamber 212a. In this embodiment of the invention, there is one solution preparer 21. The bottom of the solution preparation chamber 211a is connected to the first interface through a second water pipe 52, and the top of the solution preparation chamber 211a is connected to the second interface through a first water pipe 51, so that a connection loop 5 is formed between the solution preparation chamber 211a and the receiving cylinder 1. In other embodiments, there may be multiple solution preparers 21, which are arranged sequentially in a horizontal direction. The tops and bottoms of the solution preparation chambers 211a of adjacent solution preparers 21 are connected, so that the multiple solution preparation chambers 211a are connected in series. The bottom of the first solution preparation chamber 211a is connected to the first interface through the second water pipe 52, and the top of the last solution preparation chamber 211a is connected to the second interface through the first water pipe 51.

[0028] Specifically, such as Figure 1 As shown, in this embodiment of the invention, the elastic separator 21b of the dispensing device 21 is a vertically arranged elastic diaphragm, which is fixed to the inner wall of the dispensing device 21. The dispensing device 21 is preferably made of glass fiber reinforced polysulfone, and the elastic diaphragm is preferably made of fluororubber. The outlines of the dispensing device 21 and the elastic separator 21b are as follows: Figure 3The elliptical or other streamlined shape shown avoids dead corners that cause liquid stagnation. Preferably, the overall width-to-height ratio of the liquid dispenser 21 is ≥2:1. This makes the liquid dispensing chamber 211a close to a flat tube shape during disinfection, which increases the time required for the disinfectant to flow through the liquid dispensing chamber 211a, resulting in more thorough disinfection.

[0029] Furthermore, such as Figure 1 As shown, the elastic separator 21b has multiple protrusions 21c on the side near the liquid dispensing chamber 211a and / or on the side wall of the liquid dispensing chamber 211a facing the elastic separator 21b. In this embodiment of the invention, the protrusions 21c are raised points, and multiple raised points are evenly distributed on the side of the elastic diaphragm near the liquid dispensing chamber 211a. When the volume of the regulating chamber 212a reaches its maximum, the elastic diaphragm abuts against the side wall of the liquid dispensing chamber 211a, and a liquid flow channel is formed between adjacent protrusions 21c. It should be noted that the protrusions 21c are not limited to raised points, but can be various shapes of guiding structures such as raised strips and raised blocks.

[0030] Specifically, such as Figure 1 As shown, the first water pipe 51 between the liquid preparation chamber 211a and the second interface is provided with an inlet for supplying solvent and an outlet for discharging solution. The inlet is connected to the water supply network, and an inlet valve 531 is provided between the inlet and the water supply network. The outlet is connected to a fourth pump body 582 for transporting the prepared solution.

[0031] Specifically, such as Figure 1 As shown, the first water pipe 51 between the liquid preparation chamber 211a and the second interface is also equipped with a disinfection inlet and a disinfection outlet. The disinfection inlet is connected to a third pump body 541 for supplying disinfectant to the connection circuit 5, and the disinfection outlet is used to discharge the disinfectant. A liquid detector 55, an air vent valve 56, and a first water valve 59 are provided on the first water pipe 51 near the top of the liquid preparation chamber 211a. The liquid detector 55 is used to detect whether liquid flows out of the liquid preparation chamber 211a to determine whether the fluid fills the liquid preparation chamber 211a. The air vent valve 56 is used to discharge gas from the connection circuit 5.

[0032] Specifically, such as Figure 1 As shown, a first pump body 3 is provided on the first water pipe 51, which drives the solvent to flow sequentially through the receiving cylinder 1 and the dispensing chamber 211a along the connecting circuit 5. In this embodiment of the invention, the first pump body 3 is a gear pump, and a second water valve 60 and a water outlet valve 581 are also provided on the first water pipe 51 between the first pump body 3 and the second interface. Furthermore, a conductivity sensor (not shown in the figure) is also provided on the connecting circuit 5 for detecting the solution concentration.

[0033] Specifically, such as Figure 1 and Figure 2As shown, the volume restoration module is connected to the control chamber 212a and is used to discharge the fluid in the control chamber 212a, reduce the volume of the control chamber 212a, and thus make the liquid dispensing chamber 211a reach the target volume; the volume control module 4 is connected to the control chamber 212a and is used to inject fluid into the control chamber 212a to increase the volume of the control chamber 212a, and thus make the liquid dispensing chamber 211a reach the target volume.

[0034] Furthermore, such as Figure 1 and Figure 2 As shown, the volume restoration module includes a second pump body 41. The inlet of the second pump body 41 is connected to the control chamber 212a. A first valve 41b is provided between the inlet of the second pump body 41 and the control chamber 212a. The outlet of the second pump body 41 is connected to the drainage pipe network. A tenth valve 41d is provided between the outlet of the second pump body 41 and the drainage pipe network. The second pump body 41 draws fluid from the control chamber 212a, thereby reducing the volume of the control chamber 212a. At the same time, the drawn-out fluid is discharged into the drainage pipe network.

[0035] Furthermore, such as Figure 1 and Figure 2 As shown, the volume control module 4 includes a first balancing chamber 42 and a second balancing chamber 43. The first balancing chamber 42 includes chamber A 421 and chamber B 422, and the second balancing chamber 43 includes chamber C 431 and chamber D 432. Chamber A 421 and chamber C 431 are both connected to the outlet of the regulating chamber 212a and the second pump body 41. A second valve 421b is provided between chamber A 421 and the regulating chamber 212a, and a sixth valve 431b is provided between chamber C 431 and the regulating chamber 212a. An eighth water valve 121 is provided between the second valve 421b and the sixth valve 431b and the regulating chamber 212a. A third valve 421d is provided between chamber A 421 and the outlet of the second pump body 41, and a seventh valve 431d is provided between chamber C 431 and the outlet of the second pump body 41.

[0036] Both chamber B 422 and chamber D 432 are connected to the water inlet and the inlet of the second pump body 41. A fourth valve 422b is provided between chamber B 422 and the water inlet, an eighth valve 432b is provided between chamber D 432 and the water inlet, a fifth valve 422d is provided between chamber B 422 and the inlet of the second pump body 41, a ninth valve 432d is provided between chamber D 432 and the inlet of the second pump body 41, and a fourth water valve 81 and a fifth water valve 82 are provided between the fifth valve 422d and the ninth valve 432d and the inlet of the second pump body 41.

[0037] Furthermore, such as Figure 1As shown, a pressure detector 411a is provided between the first valve 41b, the eighth water valve 121 and the control chamber 212a to monitor the pressure in the control chamber 212a and prevent the volume control module 4 from filling the control chamber 212a with excessive liquid, which would cause the liquid dispenser 21 to be damaged by pressure. At the same time, when the second pump body 41 draws fluid from the control chamber 212a, it can monitor whether the fluid in the control chamber 212a has been drained. That is, when the pressure detector 411a detects a negative minimum pressure and no change, it means that the fluid has been drained.

[0038] Second embodiment of the invention: like Figure 4 and Figure 5 As shown, the elastic separator 21b of the dispensing device 21 is an elastic bag. The bottom of the dispensing device 21 is provided with a third interface and a fifth interface, and the top of the dispensing device 21 is provided with a fourth interface. The third interface is connected to the internal space of the elastic bag, the fourth interface is connected to the internal space of the elastic bag / the space between the elastic bag and the dispensing device 21, and the fifth interface is connected to the space between the elastic bag and the dispensing device 21. In this embodiment of the invention, the internal space of the elastic bag is the regulating cavity 212a, and the space between the elastic bag and the dispensing device 21 is the dispensing cavity 211a. The volume restoration module and the volume control module 4 are both connected to the third interface, the first interface is connected to the fifth interface, the fourth interface is connected to the second interface, and the space between the elastic bag and the dispensing device 21 is connected. The protrusion 21c is provided on the outer side of the elastic bag and / or the inner wall of the dispensing device 21. The other components and connections of this embodiment of the invention are the same as those of the first embodiment of the invention.

[0039] Compared to the elastic diaphragm, the elastic bag, as a completely independent, fully enclosed flexible container, can completely prevent cross-contamination of fluids between the dispensing chamber 211a and the regulating chamber 212a, ensuring the purity of the dispensed solution. At the same time, its overall flexible structure allows for large-scale, reciprocating volume adjustments, and during deformation, the stress distribution is uniform, exhibiting strong fatigue resistance and a long service life.

[0040] Specifically, such as Figure 4 , Figure 5 and Figure 7As shown, the top of the dispensing device 21 is provided with a first opening 2112a, and a third sealing member 13 is installed in the first opening 2112a. The third sealing member 13 includes a plug 131 and a second sealing ring 132. The plug 131 is threadedly installed in the first opening 2112a, and the second sealing ring 132 is located between the lower end of the plug 131 and the dispensing device 21 to prevent the solution from flowing out from the gap between the lower end of the plug 131 and the dispensing device 21. The bottom of the plug 131 is provided with an installation groove 131a, and the top of the elastic bag is bonded and fixed in the installation groove 131a. An installation gap is reserved between the installation groove 131a and the elastic bag fixed in the installation groove 131a. The plug 131 is provided with a fourth channel 131b, which forms the aforementioned fourth interface. One end of the fourth channel 131b is connected to the installation gap, and the other end of the fourth channel 131b is connected to the first water pipe 51. During solution preparation, the solution in the solution preparation chamber 211a first enters the installation interval, and then flows through the fourth channel 131b and the first water pipe 51.

[0041] Specifically, such as Figures 5 to 6 As shown, the bottom of the liquid dispenser 21 is provided with a second opening 2111a, and a first sealing element 6 is provided in the second opening 2111a. The first sealing component 6 includes a sealing body 61 and a first sealing ring 63. The sealing body 61 is threaded into the second opening 2111a. The first sealing ring 63 is located between the top of the sealing body 61 and the liquid dispenser 21. The sealing body 61 has a first channel 61a. A first connecting pipe 61c is inserted and fixed in the first channel 61a. The internal channel of the first connecting pipe 61c forms the aforementioned third interface. One end of the first connecting pipe 61c is connected to the elastic bag body, and the other end of the first connecting pipe 61c is connected to the second pump body 41, chamber A, and chamber C. An installation gap is reserved between the first channel 61a and the first connecting pipe 61c. The sealing body 61 also has a second channel 61b connected to the first channel 61a. The second channel 61b forms the aforementioned fifth interface. One end of the second channel 61b is connected to the installation gap, and the other end of the second channel 61b is connected to the second water pipe 52. During liquid preparation, the solution flowing through the container 1 enters the liquid preparation chamber 211a from the second channel 61b and the installation gap.

[0042] The first connecting pipe 61c connects the elastic bag body with the volume restoration module and the volume control module 4, forming an independent control path for driving the deformation of the elastic separator. The second channel 61b connects to the first interface for connection with the receiving cylinder 1, forming a material path for the solution to enter and exit the dispensing chamber 211a. On the one hand, this achieves physical isolation between the two fluids, eliminating contamination and ensuring the purity of the dispensing solution and the reliability of the system; on the other hand, by integrating multiple interfaces into one, it significantly reduces potential leakage points and enhances the overall sealing and structural stability.

[0043] Furthermore, such as Figure 6As shown, the first sealing component 6 also includes a hollow nut 62. A screw hole is provided on the side of the sealing body 61 away from the dispensing device 21, and the hollow nut 62 is fixed inside the screw hole. The first connecting pipe 61c passes through the hollow nut 62. The hollow nut 62 provides better positioning for the first connecting pipe 61c. Furthermore, a first sealing ring 63 is also provided between the top of the hollow nut 62 and the sealing body 61 to prevent solution from leaking out from the gap between the hollow nut 62 and the sealing body 61.

[0044] In other embodiments, the internal space of the elastic bag is a liquid dispensing chamber 211a, and the space between the elastic bag and the liquid dispenser 21 is a regulating chamber 212a. A first sealing member 6 is provided in the second opening 2111a. The internal channel of the first connecting pipe 61c in the first sealing member 6 forms a third interface, and the second channel 61b of the first sealing member 6 forms a fifth interface. A fourth sealing member is installed in the first opening 2112a. The fourth sealing member has the same structure as the first sealing member 6 without a second channel 61b, and the internal channel of the first connecting pipe 61c in the fourth sealing member forms a fourth interface. Then, the volume restoration module and the volume control module 4 are both connected to the fifth interface, the first interface is connected to the third interface, and the fourth interface is connected to the second interface and the internal space of the elastic bag. The protrusion 21c is provided on the inner wall of the elastic bag, and other components and connections are the same as in the second embodiment of the invention.

[0045] Third embodiment of the invention: like Figure 8 and Figure 9 As shown, the elastic separator 21b of the liquid dispenser 21 adopts an elastic bag body. The bottom of the liquid dispenser 21 is provided with a third interface and a fifth interface, and the top of the liquid dispenser 21 is provided with a fourth interface and a sixth interface. The third interface and the fourth interface are connected to the internal space of the elastic bag body, and the fifth interface and the sixth interface are connected to the space between the elastic bag body and the liquid dispenser 21.

[0046] In this embodiment of the invention, the internal space of the elastic bag is the dispensing chamber 211a, and the space between the elastic bag and the dispensing device 21 is the regulating chamber 212a. The volume restoration module is connected to the fifth interface, the first interface is connected to the third interface, the fourth interface is connected to the second interface, and the sixth interface is connected to the volume control module 4. The protrusion 21c is provided on the inner wall of the elastic bag. Specifically, the top and bottom of the dispensing device 21 are respectively provided with a first opening 2112a and a second opening 2111a. A first sealing member 6 is installed in the second opening 2111a. The first connecting pipe 61c and the second channel 61b of the first sealing member 6 form the third interface and the fifth interface, respectively. A second sealing member 7 is installed in the first opening 2112a. The second sealing member 7 has the same structure as the first sealing member 6. The first connecting pipe 61c and the second channel 61b of the second sealing member 7 form the fourth interface and the sixth interface, respectively. Other components and connection relationships in this embodiment of the invention are the same as in the second embodiment of the invention.

[0047] Compared to the single-port design of the control chamber 212a in the second embodiment of the invention, the liquid dispenser 21 of the present invention is provided with a sixth interface and a fifth interface at the top and bottom, respectively. The fluid output from the first balance chamber 42 or the second balance chamber 43 enters the control chamber 212a through the sixth interface, and the fluid in the control chamber 212a flows out through the fifth interface.

[0048] In other embodiments, the internal space of the elastic bag is the regulating cavity 212a, and the space between the elastic bag and the liquid dispenser 21 is the liquid dispensing cavity 211a. The volume restoration module is connected to the third interface, the first interface is connected to the fifth interface, the sixth interface is connected to the second interface, and the fourth interface is connected to the volume control module 4. The protrusion 21c is provided on the outer wall of the elastic bag, and other components and connections are the same as in the third embodiment of the invention.

[0049] Based on a solution preparation system according to a first embodiment of the invention, this embodiment of the invention provides a solution preparation method, including the following steps: S1, the first interface and the second interface are respectively connected to the container 1 so that a connection loop 5 is formed between the container 1 and the liquid dispensing chamber 211a; S2, the volume restoration module and the volume control module 4 adjust the volume of fluid in the regulating cavity 212a so that the liquid dispensing cavity 211a reaches the target volume; In step S2, when the volume restoration module and the volume control module 4 adjust the volume of the liquid dispensing chamber 211a, the liquid in the control chamber 212a is first drawn out by the second pump body 41, so that the control chamber 212a is emptied and the control chamber 212a is in a deflated state. At this time, the volume of the liquid dispensing chamber 211a is equal to the volume of the inner cavity 21a of the liquid dispenser 21. Then, a preset volume of fluid is injected into the control chamber 212a through the first balance chamber 42 and the second balance chamber 43, so that the liquid dispensing chamber 211a reaches the target volume.

[0050] Specifically: S21. Open the first valve 41b, start the second pump body 41, drain the fluid in the air conditioning control chamber 212a, and then close the first valve 41b. Specifically, such as Figure 1As shown, the first valve 41b and the tenth valve 41d are opened, and the second pump body 41 is started to draw liquid from the control chamber 212a. During the drawing process, the pressure detector 411a automatically detects the pressure in the pipeline. When the pressure detector 411a detects a negative minimum pressure and no change, the fluid in the control chamber 212a has been drained. At this time, the control chamber 212a is in a deflated state, and the volume of the liquid dispensing chamber 211a is equal to the volume of the inner cavity 21a of the liquid dispenser 21. Then, the first valve 41b is closed to lock the volume of the control chamber 212a. By completely emptying the control chamber 212a to a deflated state before each adjustment, all interference from the fluid remaining in the chamber from the previous adjustment is completely eliminated, improving the accuracy of the volume adjustment of the control chamber 212a.

[0051] S22, open the third valve 421d, the fifth valve 422d, the sixth valve 431b and the eighth valve 432b, supply water to chamber D 432 through the inlet, water in chamber C 431 flows into the control chamber 212a, and the second pump body 41 draws water from chamber B 422 to chamber A 421; In this embodiment of the invention, the inner volume of the first balance chamber 42 and the inner volume of the second balance chamber 43 are both V. Before the volume control module 4 injects water into the regulating chamber 212a, the C chamber 431 is pre-filled with water. Specifically, the inlet valve 531, the fourth valve 422b, and the eighth valve 432b are opened, and the first pump body 3 is started to inject water into chambers B 422 and D 432, so that chambers B 422 and D 432 are filled with water and the volume of chambers B 422 and D 432 reaches V, while the volume of chambers A 421 and C 431 reaches its minimum. Then, the ninth valve 432d, the fifth water valve 82, the fourth water valve 81, and the seventh valve 431d are opened, and the inlet valve 531, the fourth valve 422b, the eighth valve 432b, and the first pump body 3 are closed simultaneously to draw water from chamber D 432 into chamber C 431, so that chamber C 431 is filled with water and the volume of chamber C 431 reaches V, while the volume of chamber D 432 reaches its minimum.

[0052] Then, close the ninth valve 432d and the seventh valve 431d, and simultaneously open the inlet valve 531, the eighth valve 432b, the sixth valve 431b, the fifth valve 422d, the fifth water valve 82, the fourth water valve 81, the third valve 421d, and the eighth water valve 121. Start the first pump body 3 to inject water into chamber D 432. Chamber D 432 gradually fills and squeezes chamber C 431. The water in chamber C 431 flows out of chamber C 431 and enters the control chamber 212a until chamber D 432 is completely filled. At this time, chamber C 431 is in a deflated state. At the same time, start the second pump body 41 to pump the water in chamber B 422 into chamber A 421 until chamber A 421 is completely filled. At this time, chamber B 422 is in a deflated state, completing the injection of water with a volume of V into the control chamber 212a.

[0053] S23. Close the third valve 421d, the fifth valve 422d, the sixth valve 431b and the eighth valve 432b, and simultaneously open the second valve 421b, the fourth valve 422b, the seventh valve 431d and the ninth valve 432d. Water is supplied to chamber B 422 through the inlet. Water in chamber A 421 enters the control chamber 212a. The second pump body 41 draws water from chamber D 432 into chamber C 431. Specifically, the third valve 421d, the fifth valve 422d, the sixth valve 431b, and the eighth valve 432b are closed, while the second valve 421b, the fourth valve 422b, the seventh valve 431d, and the ninth valve 432d are opened simultaneously. The first pump body 3 is started to inject water into chamber B 422. Chamber B 422 gradually fills and squeezes chamber A 421. The water in chamber A 421 flows out of chamber A 421 and enters the control chamber 212a until chamber B 422 is completely filled. At this time, chamber A 421 is in a deflated state. At the same time, the second pump body 41 is started to pump water from chamber D 432 into chamber C 431 until chamber C 431 is completely filled. At this time, chamber D 422 is in a deflated state, thus completing the injection of water of volume V into the control chamber 212a.

[0054] S24. Repeat steps S22 to S23 until the water entering the control chamber 212a reaches the preset volume.

[0055] It should be noted that the order of steps S22 to S23 is not important; they can be performed alternately. Correspondingly, if S12 is executed first, that is, water is supplied through the second balance chamber 43, then chamber C 431 is pre-filled with water; if S13 is executed first, that is, water is supplied through the first balance chamber 42, then chamber A 421 is pre-filled with water.

[0056] In this embodiment of the invention, the dual-balance chambers work alternately. When water is injected into chamber D 432 of the second balance chamber 43, thereby horizontally and steadily pushing chamber C 431 into the control chamber 212a, the second pump 41 simultaneously pumps water from chamber B 422 of the first balance chamber 42 to chamber A 421, preparing water for the next liquid injection. This design achieves continuous and shock-free fluid delivery to the control chamber 212a, completely avoiding the pressure pulsation and flow rate fluctuation problems that are difficult to overcome when using a single pump to directly inject water, and providing a stable driving source for precise volume control.

[0057] In this embodiment of the invention, the volume of fluid pushed into the control chamber 212a is set as the target volume for volume control. Then, the target volume for volume control = the volume of the balance chamber V * the number of pushing chambers, where the number of pushing chambers includes a whole part and a fractional part. The fractional part of the number of pushing chambers is achieved by jogging the solenoid valve. In this embodiment of the invention, all valves in the liquid distribution system are solenoid valves. Therefore, the target volume for volume control = the volume of the balance chamber V * the number of pushing chambers = the liquid volume per unit jogging of the valve * the total number of jogging times of the valve body. The total number of jogging times of the valve body is the sum of the jogging times of the fourth valve 422b and the eighth valve 432b, or the sum of the jogging times of the second valve 421b and the sixth valve 431b. The liquid volume per unit jogging of the valve = the volume of the balance chamber V / the total number of jogging times when the valve body passes through a volume of V liquid. The jogging speed = the liquid volume per unit jogging of the valve / the jogging interval time.

[0058] Specifically, in this embodiment of the invention, when step S22 or S23 is completed, liquid of volume V of the balance chamber is filled into the control chamber 212a. Therefore, the actual number of chambers varies depending on the target volume being pushed. Besides the portion pushing liquid into the entire chamber, there may be a small amount of liquid insufficient for the entire chamber, resulting in a decimal portion of the chamber count. When actually measuring the pushing volume, the entire portion of the pushing chamber count can be obtained by switching between steps S22 and S23, while the decimal portion is obtained by jogging the valve body. First, the liquid volume of the decimal portion of the pushing chamber count is determined, then the liquid volume per valve jog is obtained. This allows the determination of the final number of valve jogs. Accurate addition of the decimal portion of the pushing chamber volume is achieved when the valve body jogs to the calculated number of times. The liquid volume per valve jog can be pre-calculated by measuring how many jogs are needed to fill the balance chamber, i.e., the formula "Liquid volume per valve jog = Balance chamber volume V / Total number of jogs when the valve body passes through volume V of liquid". It should also be noted that, in this embodiment of the invention, the speed of liquid pushing can also be controlled by jogging the control valve, wherein "jogging speed = unit jogging liquid volume / jogging interval duration". By controlling the jogging interval duration, the speed of the entire liquid pushing can be controlled.

[0059] In step S22 of this embodiment of the invention, the volume of the fractional part of the number of water supply chambers can be achieved by controlling the sixth valve 431b or the eighth valve 432b to jog, and the filling speed can be controlled by controlling the eighth valve 432b, the sixth valve 431b and the eighth water valve 121 to jog; in step S23, the volume of the fractional part of the number of water supply chambers can be achieved by controlling the second valve 421b or the fourth valve 422b to jog, and the filling speed can be controlled by controlling the fourth valve 422b, the second valve 421b and the eighth water valve 121 to jog.

[0060] S3. Solvent is introduced through the inlet so that the solvent flows sequentially through the container 1 and the dispensing chamber 211a. Solvent is introduced after the dispensing chamber 211a is filled with solvent. In step S3, the inlet valve 531, the second water valve 60, and the outlet valve 581 are opened, and the first pump body 3 is started. The solvent enters the first water pipe 51 through the inlet and enters from the bottom of the container 1. The solvent mixes with the dry powder in the container 1 and flows out from the top of the container 1. Then, it enters the liquid preparation chamber 211a through the second water pipe 52. The solution flows out from the top of the liquid preparation chamber 211a from bottom to top. When the liquid detector 55 detects the liquid, the solvent has filled the liquid preparation chamber 211a. The sum of the volumes of the liquid preparation chamber 211a, the container 1, and the second water pipe 52 is the liquid preparation volume. At this time, the volume of the solvent reaches the liquid preparation volume. The inlet valve 531 is closed, and the input of solvent into the first water pipe 51 is stopped.

[0061] S4. Drive the solvent to circulate along the connecting loop 5; In step S4, the first water valve 59 is opened, and the first pump body 3 drives the solvent to circulate along the connecting circuit 5. The solvent flow simultaneously drives the solute to move, accelerating the solute dissolution and improving the dissolution efficiency.

[0062] S5. When the solution in the circuit to be connected 5 reaches the target concentration, the solution is supplied through the outlet. In step S5, when the conductivity sensor on the connection circuit 5 detects that the solution has reached the target concentration, the first pump 3 is shut off, and a qualified solution is prepared. In use, the outlet valve 581 is opened, and the fourth pump 582 is started to output the solution for use.

[0063] S6. Disinfect the solution preparation chamber 211a after the solution is drained or before the solution is prepared again.

[0064] Specifically: S61. Execute step S2 until the control cavity 212a reaches its maximum volume; In step S61, water is injected into the regulating cavity 212a through the volume control module 4. When the regulating cavity 212a reaches or approaches the volume of the inner cavity 21a of the liquid dispenser 21, the regulating cavity 212a reaches its maximum volume, the fluid in the liquid dispensing cavity 211a is emptied, the elastic partition 21b abuts against the inner wall of the liquid dispensing cavity 211a, and a liquid flow channel is formed between the elastic partition 21b and the protrusion 21c on the inner wall of the liquid dispensing cavity 211a.

[0065] S62. Disinfectant and water are injected through the disinfection inlet and water inlet respectively. Water and disinfectant are mixed to form disinfectant solution. Water input is stopped after the disinfectant solution fills the solution preparation chamber 211a. In step S62, the inlet valve 531, the second water valve 60, the outlet valve 581, the third pump body 541, and the first pump body 3 are opened. The third pump body 541 injects disinfectant into the first water pipe 51 and injects water into the first water pipe 51 through the inlet. The first pump body 3 drives the disinfectant and water to flow sequentially through the container 1 and the liquid mixing chamber 211a. When the liquid detector 55 detects water, the liquid mixing chamber 211a is filled with water. At this time, the volume of water reaches the preset volume. The inlet valve 531 is closed, and the water supply to the first water pipe 51 is stopped. The water and disinfectant are mixed to form a disinfectant solution.

[0066] S63, drive the disinfectant to circulate along the connection loop 5; Open the first water valve 59, and the first pump body 3 drives the disinfectant to circulate along the connecting circuit 5 for disinfection.

[0067] S64. After the preset time is reached, the disinfectant solution is discharged from the disinfection outlet.

[0068] The second pump body 41 is connected to the first water pipe 51. A third water valve 41f is provided between the second pump body 41 and the first water pipe 51. After a preset time is reached, the third water valve 41f, the second pump body 41, and the tenth valve 41d are opened, and the second pump body 41 discharges the disinfectant.

[0069] For disposable container 1, container 1 can be removed before disinfection. After connecting the first water pipe 51 and the second water pipe 52 through the connecting pipe 10, the disinfection operation can be performed.

[0070] The above disinfection method, by pre-adjusting the control chamber 212a to its maximum volume, compresses the space of the liquid preparation chamber 211a to its minimum, allowing the injected disinfectant to quickly fill and saturate the entire liquid preparation chamber 211a, thus improving disinfection efficiency and achieving effective coverage of the liquid preparation chamber 211a with lower disinfectant consumption, thereby reducing disinfection costs.

[0071] Moreover, when the space of the liquid preparation chamber 211a is compressed to its minimum, the elastic partition 21b abuts against the inner wall of the liquid dispenser 21. The protrusions 21c provided on the elastic partition 21b and the inner wall of the liquid dispenser 21 form stable micro-flow channels. These flow channels ensure that the disinfectant can continue to flow through and flush every contact interface between the elastic partition 21b and the inner wall of the liquid preparation chamber 211a during circulation, completely avoiding contact dead zones caused by tight fit, making disinfection without dead angles and improving the reliability of disinfection.

[0072] In summary, the liquid preparation system provided by this invention breaks the limitation in the prior art where the volume of the liquid preparation water is determined by the dry powder container and the dissolving chamber. It allows the volume of the liquid preparation chamber 211a to be flexibly adjusted according to the requirements of the container 1 with different dry powder contents, ensuring that the solvent volume meets the dilution requirements and thus obtaining the target solution. This solves the problem in the prior art where the built-in dissolving chamber is not convenient to change the liquid preparation volume and cannot meet the accuracy requirements of the water volume for liquid preparation.

[0073] This invention provides a solution preparation method. Step S2 calculates the target volume of the solution preparation chamber 211a based on the current volume of the container 1 and the dilution volume, and adjusts the volume of the solution preparation chamber 211a to the target volume using a volume restoration module and a volume control module 4. This achieves precise matching between the water volume and the dry powder, ensuring the accuracy of the solution concentration from the start of the process. Step S3 determines the solvent addition by checking if the solution preparation chamber is full, avoiding concentration deviations caused by excessive or insufficient solvent, further improving the accuracy of the solution concentration. Step S4 drives solvent circulation to accelerate the dissolution of the dry powder and homogenize the solution concentration, avoiding localized uneven concentrations. In step S5, the dry powder completely dissolves in a fixed volume of solvent, ensuring the resulting solution concentration reaches the preset target value. This invention's solution preparation method has a clear process and controllable steps, effectively avoiding concentration anomalies caused by inaccurate volume control and insufficient dissolution in existing solution preparation processes, thus improving the versatility and standardization of solution preparation operations.

[0074] In summary, the solution preparation system and method of this invention are suitable for the personalized needs of different patients for solution formulation in clinical practice, and solve the problem that the built-in dissolution chamber of the existing equipment is not convenient to change the solution preparation volume and cannot meet the accuracy requirements of the water volume for solution preparation.

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A liquid preparation system, characterized by comprising: include: First interface; Second interface; The liquid preparation module (2) includes at least one liquid preparation device (21), each of the liquid preparation devices (21) having an inner cavity (21a), and an elastic partition (21b) provided in the inner cavity (21a) to divide the inner cavity (21a) into a liquid preparation chamber (211a) and a control chamber (212a). The elastic partition (21b) has a plurality of protrusions (21c) on the side near the liquid dispensing chamber (211a) and / or on the side wall of the liquid dispensing chamber (211a) facing the elastic partition (21b). The bottom of the solution mixing chamber (211a) is connected to the first interface, and the top of the solution mixing chamber (211a) is connected to the second interface. An inlet for supplying solvent and an outlet for discharging solution are provided between the solution mixing chamber (211a) and the second interface. A volume restoration module, connected to the control cavity (212a), is used to discharge the fluid in the control cavity (212a) to reduce the volume of the control cavity (212a); The volume control module (4) is connected to the control cavity (212a) and is used to inject fluid into the control cavity (212a) to increase the volume of the control cavity (212a).

2. The liquid preparation system according to claim 1, wherein The volume restoration module includes a second pump body (41), the inlet of which is connected to the control chamber (212a), and a first valve (41b) is provided between the inlet of the second pump body (41) and the control chamber (212a).

3. The liquid preparation system according to claim 2, wherein The volume control module (4) includes a first balance chamber (42) and a second balance chamber (43). The first balance chamber (42) includes chamber A (421) and chamber B (422), and the second balance chamber (43) includes chamber C (431) and chamber D (432). Both chamber A (421) and chamber C (431) are connected to the control chamber (212a) and the outlet of the second pump body (41). A second valve (421b) is provided between chamber A (421) and the control chamber (212a), a sixth valve (431b) is provided between chamber C (431) and the control chamber (212a), a third valve (421d) is provided between chamber A (421) and the outlet of the second pump body (41), and a seventh valve (431d) is provided between chamber C (431) and the outlet of the second pump body (41). Both chamber B (422) and chamber D (432) are connected to the water inlet and the inlet of the second pump body (41). A fourth valve (422b) is provided between chamber B (422) and the water inlet, an eighth valve (432b) is provided between chamber D (432) and the water inlet, a fifth valve (422d) is provided between chamber B (422) and the inlet of the second pump body (41), and a ninth valve (432d) is provided between chamber D (432) and the inlet of the second pump body (41).

4. The liquid preparation system according to claim 1, wherein The elastic separator (21b) is an elastic bag body. The bottom of the liquid dispenser (21) is provided with a third interface and a fifth interface. The top of the liquid dispenser (21) is provided with a fourth interface. The third interface is connected to the internal space of the elastic bag body. The fourth interface is connected to the internal space of the elastic bag body / the space between the elastic bag body and the liquid dispenser (21). The fifth interface is connected to the space between the elastic bag body and the liquid dispenser (21). The internal space of the elastic bag is a regulating cavity (212a). The volume restoration module and the volume control module (4) are both connected to the third interface. The first interface is connected to the fifth interface. The fourth interface is connected to the second interface and the space between the elastic bag and the liquid dispenser (21). Alternatively, if the internal space of the elastic bag is a liquid dispensing chamber (211a), then the first interface is connected to the third interface, the volume restoration module and the volume control module (4) are both connected to the fifth interface, and the fourth interface is connected to the second interface and the internal space of the elastic bag.

5. The solution preparation system according to claim 4, characterized in that, The top of the liquid dispenser (21) is also provided with a sixth interface, the sixth interface and the space between the elastic bag and the liquid dispenser (21) are connected, and the fourth interface is connected to the internal space of the elastic bag. The internal space of the elastic bag is a regulating cavity (212a), the volume restoration module is connected to the third interface, the volume control module (4) is connected to the fourth interface, and the sixth interface is connected to the second interface; Alternatively, the internal space of the elastic bag is a liquid dispensing chamber (211a), the volume restoration module is connected to the fifth interface, the volume control module (4) is connected to the sixth interface, and the fourth interface is connected to the second interface.

6. The solution preparation system according to claim 1, characterized in that, The elastic separator (21b) is a vertically arranged elastic diaphragm.

7. A method for preparing a solution, characterized in that, The liquid preparation system according to any one of claims 1 to 6 comprises the following steps: S1, the first interface and the second interface are respectively connected to the container (1) so that a connection loop (5) is formed between the container (1) and the liquid dispensing chamber (211a). S2, the volume restoration module and the volume control module (4) adjust the volume of the fluid in the control chamber (212a) so that the liquid dispensing chamber (211a) reaches the target volume; S3. Solvent is introduced through the inlet so that the solvent flows sequentially through the container (1) and the dispensing chamber (211a). The solvent is introduced after the dispensing chamber (211a) is filled. S4. Drive the solvent to circulate along the connection loop (5); S5. Once the solution in the connection circuit (5) reaches the target concentration, the solution is supplied through the outlet.

8. The solution preparation method according to claim 7, characterized in that, In step S2, the volume restoration module and the volume control module (4) adjust the volume of the fluid in the regulating chamber (212a) so that the liquid dispensing chamber (211a) reaches the target volume, specifically: S21. Open the first valve (41b), start the second pump body (41), drain the fluid in the control chamber (212a), and then close the first valve (41b). S22. Open the third valve (421d), the fifth valve (422d), the sixth valve (431b) and the eighth valve (432b) to supply water to chamber D (432) through the inlet. Water in chamber C (431) flows into the control chamber (212a). The second pump body (41) draws water from chamber B (422) into chamber A (421). S23. Close the third valve (421d), the fifth valve (422d), the sixth valve (431b) and the eighth valve (432b), and simultaneously open the second valve (421b), the fourth valve (422b), the seventh valve (431d) and the ninth valve (432d), supply water to the B chamber (422) through the inlet, and the water in the A chamber (421) flows into the control chamber (212a), and the second pump body (41) draws water from the D chamber (432) into the C chamber (431). S24. Repeat steps S22 to S23 until the water flowing into the control chamber (212a) reaches the preset volume.

9. The solution preparation method according to claim 8, characterized in that, Let the volume of fluid pushed into the control cavity (212a) be the target volume for volume control, then: The target volume for volume control = volume of the balance chamber V * number of liquid pushing chambers = liquid volume per unit jog of the valve * total number of jogs of the valve body; The total number of times the valve body pushes the liquid is the sum of the number of times the fourth valve (422b) and the eighth valve (432b) are jogged, or the sum of the number of times the second valve (421b) and the sixth valve (431b) are jogged. The volume of liquid per unit jog of the valve = the volume of the balance chamber V / the total number of jogs when the valve body passes through a volume V of liquid; Jogging speed = Unit jogging liquid volume / Jogging interval duration.

10. The solution preparation method according to claim 7, characterized in that, The second interface is provided with a disinfection inlet and a disinfection outlet between it and the liquid preparation chamber (211a); The solution preparation method further includes: S6. After the solution is drained or before it is re-prepared, the solution preparation chamber (211a) is disinfected, specifically as follows: S61. Perform step S2 until the control cavity (212a) reaches its maximum volume; S62. Disinfectant and water are injected through the disinfection inlet and the water inlet respectively. The water and disinfectant are mixed to form a disinfectant solution. The water is stopped after the disinfectant solution fills the liquid preparation chamber (211a). S63. Drive the disinfectant to circulate along the connection circuit (5); S64. After the preset time is reached, the disinfectant is discharged from the disinfection outlet.

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