Fluid valve assembly and drug injection system

Abstract

This invention provides a fluid valve assembly and a drug injection system, comprising: a valve body with a flexible tube for fluid flow; a valve block slidably disposed within the valve body, the valve block having a pressure-receiving portion that contacts the flexible tube; a power mechanism including a spring mechanism positioned between the valve body and the valve block, and a tension member whose length changes upon energization. The spring force of the spring mechanism keeps the pressure-receiving portion pressed against the flexible tube and deforms the tube into a blocking state. The tension member is connected to the valve block, and when energized, it shortens to move the valve block away from the flexible tube, restoring the flexible tube to its open state. This invention achieves pressure control of the flexible tube through the tension member whose length changes upon energization, ensuring the elimination of squeezing force on the tube to properly open the tube for flow, realizing valve control, and is more easily integrated with the flow channels in a membrane pump for stable control.

Description

Technical Field

[0001] This invention relates to the field of drug injection, and in particular to fluid valve assemblies used in drug injection and drug injection systems incorporating such membrane pump technology. Background Technology

[0002] Currently, peristaltic pumps, piston pumps, and diaphragm pumps are commonly used for fluid delivery. These pumps have various structural forms, including peristaltic squeeze, piston, and diaphragm check valve. Insulin therapy plays a crucial role in diabetes management, primarily through multiple daily subcutaneous injections and continuous insulin pump infusion. Insulin pumps are mainly divided into catheter-based and patch-based types. Patch-based insulin pumps are catheter-free, lighter, and smaller, offering better safety, comfort, and privacy to meet the needs of patients requiring long-term use.

[0003] Generally, diaphragm check valve pumps achieve continuous flow by using two check valves. The opening and closing of these check valves requires appropriate pressure, meaning a tiny amount of fluid relative to the pump volume must be sacrificed. This can lead to inaccurate metering in applications involving minute fluid transfers. Pressure-type check valves also pose a risk of unintended opening and closing, a risk that can be fatal in the medical field. They are typically inadequate for low-speed and low-volume transfers.

[0004] Therefore, there is a need for a pump valve assembly that is easy to control and can be used in insulin pumps. Summary of the Invention

[0005] This invention provides a fluid valve assembly for drug injection, and a drug injection system with the fluid valve assembly. The fluid valve assembly can control the pressure of the tubing by a tension member whose length changes when energized, thereby opening the tubing for flow. The entire valve assembly is easy to control, safe and reliable, and can be used in drug injection systems for small-volume delivery.

[0006] This invention provides a fluid valve assembly comprising:

[0007] The valve body is equipped with a flexible hose for fluid to pass through;

[0008] A valve block is slidably disposed in the valve body, and the valve block has a pressure-resistant part that contacts the hose;

[0009] The power mechanism includes a spring mechanism placed between the valve body and the valve block, and a tension member whose length changes when energized. The spring force of the spring mechanism keeps the pressing part pressed against the hose and deforms the hose to a blocking state. The tension member is connected to the valve block. When the tension member is energized, it shortens to drive the valve block away from the hose, so that the hose returns to the open state.

[0010] Preferably, there are two hoses and two pressure-blocking parts, each corresponding to one of the hoses.

[0011] Preferably, the elastic mechanism is a compression spring.

[0012] Preferably, the valve body is provided with a guide portion, and the valve block slides along the guide portion.

[0013] Preferably, the pressing portion has a linear pressing ridge, which is pressed onto the hose.

[0014] Preferably, the valve body is provided with a channel through which the hose passes, and the pressure-blocking portion extends into the channel.

[0015] Preferably, the stretching member is a shape memory alloy wire, with both ends of the shape memory alloy wire fixedly disposed and connected to an electrode respectively, and the shape memory alloy wire is fixedly connected to the valve block.

[0016] This application also provides a membrane pump, which includes a power flow channel and a working flow channel, a metering tank located at the junction of the power flow channel and the working flow channel, and a fluid valve assembly as described above. An elastic membrane is provided at the metering tank. Both the power flow channel and the working flow channel are divided into an inlet section and an outlet section by the metering tank. The elastic membrane is shifted to the side with lower pressure in the power flow channel and the working flow channel due to pressure changes in the power flow channel and the working flow channel, so as to allow fluid to enter and exit the metering tank. The fluid valve assembly consists of two or more sets, each set containing two or more hoses. Two hoses from one set are connected to the inlet section of the power flow channel and the outlet section of the working flow channel, respectively. Two hoses from the other set are connected to the outlet section of the power flow channel and the inlet section of the working flow channel, respectively.

[0017] This application also provides a drug injection system, which includes:

[0018] A drug reservoir, comprising a liquid storage chamber and a drive mechanism disposed in the liquid storage chamber to drive the flow of liquid, the liquid reservoir having an outlet for the fluid to flow out;

[0019] A membrane pump includes a power flow channel and a working flow channel, a metering tank located at the junction of the power flow channel and the working flow channel, and a fluid valve assembly as described above. An elastic membrane is provided at the metering tank. Both the power flow channel and the working flow channel are divided into an inlet section and an outlet section by the metering tank. The elastic membrane shifts towards the side with lower pressure in the power flow channel and the working flow channel due to pressure changes, allowing fluid to enter and exit the metering tank. The fluid valve assembly consists of two or more sets, each set containing two or more hoses. Two hoses from one set are connected to the inlet section of the power flow channel and the outlet section of the working flow channel, respectively. Two hoses from the other set are connected to the outlet section of the power flow channel and the inlet section of the working flow channel, respectively.

[0020] A power source, which is connected to the power flow channel, and the power source contains a driving fluid that flows into the power flow channel.

[0021] Preferably, the driving mechanism includes a piston placed in the liquid storage chamber and a pneumatic tube connected to the piston; the power source is a hydrogen and oxygen generating device, the hydrogen output pipe of the hydrogen and oxygen generating device is connected to the power flow channel to make hydrogen the driving fluid, and the oxygen output pipe of the hydrogen and oxygen generating device is connected to the pneumatic tube to make oxygen the power to drive the piston.

[0022] Preferably, a pressure stabilizing mechanism is provided at the connection between the oxygen output pipe and the pneumatic pipe. The pressure stabilizing mechanism includes a microchannel connecting the pneumatic pipe and the oxygen output pipe, an elastic mechanism, and a valve body connected to the elastic mechanism. A portion of the valve body is placed in the microchannel and is sealed by the elastic force of the elastic mechanism.

[0023] Preferably, the hydrogen and oxygen generating device includes a housing, a support structure placed inside the housing, and a first metal electrode plate, a first metal catalyst layer and a membrane electrode, a second metal catalyst layer and a second metal electrode plate sequentially pressed onto the support structure. The support structure is provided with a water-carrying porous material. The first metal electrode plate and the second metal electrode plate are respectively connected to the positive electrode and the negative electrode. The hydrogen output pipe and the oxygen output pipe are both connected to the inside of the housing.

[0024] As described above, the fluid valve assembly and drug injection system of the present invention have the following advantages: the fluid valve assembly can control the pressure of the tubing through a tension member whose length changes upon being energized, ensuring the elimination of squeezing force on the tubing to properly open the tubing for flow, thus achieving valve control, and is easier to integrate with the flow channel in a membrane pump to achieve stable control. The drug injection system using this fluid valve assembly can quantitatively inject drugs; the overall size is smaller after integrating the fluid valve assembly. Attached Figure Description

[0025] Figure 1 The diagram shown is a schematic representation of the drug injection system of the present invention.

[0026] Figure 2 The figure shown is an embodiment of the fluid valve assembly of the present invention.

[0027] Figure 3 The figure shown is an embodiment of the membrane pump of the present invention.

[0028] Figure 4 The diagram shown is an overall schematic of the drug injection system of the present invention.

[0029] Figure 5 The figure shown is an embodiment of the medicine storage device of the present invention.

[0030] Figure 6 The figure shown is an embodiment of the hydrogen and oxygen generating apparatus of the present invention.

[0031] Component designation explanation

[0032] 100 medicine storage container

[0033] 200 gas source

[0034] Valves 300a, 300b, 300c, and 300d (first to fourth valves)

[0035] 400 membrane pump

[0036] 401 Dynamic Flow Channel

[0037] 402 Workflow

[0038] 403, 404, 405, 406 mounting ports

[0039] 101 Piston

[0040] 102 Drive mechanism

[0041] 103 Voltage stabilizing mechanism

[0042] 104 Liquid Storage Chamber

[0043] 105 Exports

[0044] 106 Valve body

[0045] 107 Pneumatic Tube

[0046] 201 Supporting Structure

[0047] 202 First Metal Plate

[0048] 203 First Metal Catalyst Layer

[0049] 204 membrane electrode

[0050] 205 Porous Materials

[0051] 206 Seals

[0052] 207 Oxygen Channel

[0053] 208 Hydrogen Channel

[0054] 301 Valve Body

[0055] 302 Compression Spring

[0056] 303 Valve Block

[0057] 304 pressure section

[0058] Channel 305

[0059] 306 hose

[0060] 307 Guiding Section

[0061] 308 stretching component Detailed Implementation

[0062] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0063] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0064] This invention provides a fluid valve assembly, such as... Figure 2 As shown, this embodiment includes:

[0065] The valve body 301 is provided with a hose 306 for fluid to pass through;

[0066] The valve block 303 is slidably disposed in the valve body 301, and the valve block 303 has a pressure part 304 that contacts the hose 306;

[0067] The power mechanism includes a spring mechanism placed between the valve body 301 and the valve block 303, and a tension member 308 whose length changes when energized. The spring mechanism's elastic retaining pressing part 304 presses against the hose 306 and deforms the hose 306 to a blocking state. The tension member 308 is connected to the valve block 303. When the tension member 308 is energized, it shortens to drive the valve block 303 away from the hose 306, so that the hose 306 returns to the open state.

[0068] This invention employs an elastic mechanism and a tension member whose length changes upon energization as the power mechanism to achieve the opening and closing of the hose. The tension member only needs to be energized to extend or shorten, eliminating the elastic force of the elastic mechanism and changing the shape of the hose. This allows for easy and reliable operation. Furthermore, the tension member's action is rapid, making it suitable for use in low-flow control channels, such as drug injection systems. Preferably, there are two hoses, and two pressure-retaining parts corresponding to each hose.

[0069] As one embodiment, the aforementioned elastic mechanism is a compression spring 302. In this embodiment, the compression spring 302 is initially in a compressed state or a natural state. Its elastic force and the weight of the valve block directly compress the valve block 303, which in turn compresses the hose 306, ensuring that the hose is in a blocked state. The elastic mechanism can also be a tension spring or other structure that can provide elastic force; furthermore, its initial state is not limited to the compressed state, but can also be a stretched state that ensures the valve block 303 is away from the hose 306. In this case, the stretching member moves to overcome the stretching force, causing the valve block to compress the hose.

[0070] To ensure more stable valve opening and closing, the valve body 301 is provided with a guide portion 307. The valve block 303 slides along the guide portion 307, and the guide portion 307 ensures the linear movement of the valve block 303. The guide portion 307 can be a guide post or a protruding guide ridge on the valve body 301, and is not limited thereto.

[0071] To better adapt to the transportation of small-flow fluids, in one embodiment, the aforementioned pressure portion 304 has a linear pressure ridge that presses against the hose 306. The linear pressure ridge is tangential to the hose 306, enabling line contact when the hose is squeezed, making it easier to control the deformation of the hose and ensuring more stable hose blockage and flow.

[0072] The valve body 301 is provided with a channel 305 through which the hose 306 passes, and the pressing part 304 extends into the channel 305. The channel 305 can guide the movement of the pressing part 304 on the one hand, and prevent the hose 306 from being misaligned and moving, so that the pressing part 304 cannot accurately squeeze the hose.

[0073] As one embodiment, the aforementioned tensioning member 308 is a shape memory alloy wire. Both ends of the shape memory alloy wire are fixedly disposed and connected to an electrode respectively. The shape memory alloy wire is fixedly connected to the valve block 303. The valve block 303 is pulled by the shortening of the shape memory alloy wire under power, thereby initiating the flow of the hose. The aforementioned tensioning member 308 is not limited to this; it can also be an electromagnetic actuator, which actuates by switching on and off power to pull the valve block.

[0074] Similarly, by arranging two or more sets of the above-mentioned fluid valve assemblies in a symmetrical manner, with two hoses in the same set connected to different flow channels, four valves can be formed to control the two flow channels, which can be applied to membrane pump devices.

[0075] Membrane pump device

[0076] This application provides a membrane pump device. The membrane pump of this embodiment can be used as a drive mechanism for a drug injection system, or as a drive mechanism for other fluid control outputs. For example... Figure 1 As shown, in this embodiment, the membrane pump 400 includes a power flow channel 401 and a working flow channel 402, two sets of fluid valve assemblies as described in the above embodiments, and a metering tank (not shown) located at the junction of the power flow channel 401 and the working flow channel 402. An elastic membrane is provided at the metering tank. Both the power flow channel and the working flow channel are divided into an inlet section and an outlet section by the metering tank. The elastic membrane shifts towards the side with lower pressure in the power flow channel 401 and the working flow channel 402 due to pressure changes, thereby facilitating the entry and exit of fluid from the metering tank. Figure 3 As shown, in this embodiment, the membrane pump 400 has a valve mounting port on its housing that is connected to a hose in the fluid valve assembly, such as mounting ports 406 and 404 on the working flow channel and mounting ports 405 and 403 on the power flow channel. Each mounting port can be connected to a hose in the fluid valve assembly. This embodiment achieves pressure changes on both sides of the elastic membrane in the metering tank by opening and closing the hose, thereby driving the elastic membrane to shift towards the side with lower pressure in the power flow channel and the working flow channel. The pressure change on both sides of the elastic membrane is achieved by controlling the movement of the valve block in the fluid valve assembly to alternately inject fluid into the metering tank in the power flow channel and the working flow channel, thereby changing the pressure. For example, when the valve block on the inlet section of the power flow channel moves, the hose opens, opening the inlet section of the power flow channel, while the valve block on the outlet section remains in its initial state, the hose closes, causing the pressure in the power flow channel to increase. The elastic membrane shifts towards the working flow channel, which can squeeze the fluid to be delivered in the metering tank out. Conversely, the fluid to be delivered in the working flow channel enters the metering tank, while the driving fluid in the power flow channel is discharged. If the medicine flows into the working flow channel, the medicine can be injected. This embodiment ensures the periodic or intermittent pumping out of the fluid to be delivered.

[0077] To facilitate the monitoring of the membrane pump's status, in one embodiment, the membrane pump further includes a detection element mounted on the elastic membrane that moves with the elastic membrane, and a sensor mounted on the membrane pump for detecting changes in the movement of the detection element. The sensor outputs the operating status of the membrane pump. The detection element and sensor can be implemented using displacement detection technology, mechanical detection technology, or resistance, voltage, electromagnetic, and other detection technologies. In a preferred embodiment, the sensor is a fixedly mounted Hall sensor, and the detection element is a magnet attached to the elastic membrane. When the elastic membrane is compressed and deforms to one side, squeezing out the fluid to be transported from the metering tank, the magnet moves with the elastic membrane toward the metering tank. The Hall sensor detects the change in the magnet, thereby monitoring the operating status of the elastic membrane.

[0078] In one embodiment, the driving fluid is a gas, and the power flow channel is connected to a gas source. The deformation of the elastic membrane is achieved through the flow of gas, thereby pumping out the fluid to be transported in the working flow channel. The driving fluid is not limited to gas; it can also be a liquid. The alternation of storage and pumping of the fluid to be transported in the metering tank can be achieved simply by opening and closing a micro-valve assembly.

[0079] Drug injection system

[0080] This application also provides a drug injection system, such as Figure 1 and Figure 4 As shown, the drug injection system includes:

[0081] The drug reservoir 100 includes a liquid storage chamber and a drive mechanism 102 placed in the liquid storage chamber to drive the liquid flow. The liquid reservoir has an outlet for the fluid to flow out.

[0082] The membrane pump 400 and fluid valve assembly 300 in the above embodiments are connected to the outlet of the reservoir 100 via the inlet section of the working flow channel 402.

[0083] Power source ( Figure 1 In the embodiment shown, the gas source is 200, the power source is connected to the power flow channel 401, and the power source is provided with driving fluid that flows into the power flow channel 401.

[0084] The membrane pump in this embodiment is equipped with two sets of fluid valve assemblies 300, see... Figure 3 , Figure 1 As shown, the system may include a first valve 300a located at the inlet port 406 of the working flow channel and a second valve 300b located at the outlet port 404 of the working flow channel; a third valve 300c located at the inlet port 405 of the power flow channel and a fourth valve 300d located at the outlet port 403 of the power flow channel. In one embodiment, the first valve 300a and the fourth valve 300d constitute a fluid valve assembly 300, and the second valve 300b and the third valve 300c also constitute a fluid valve assembly 300. The drug pumping process includes two operating states, see... Figure 1 As shown, in operating state 1, the first valve 300a and the fourth valve 300d are open, while the second valve 300b and the third valve 300c are closed. In this state, the drug reservoir pumps the drug solution into the metering tank of the membrane pump device under a pre-set force, expelling air from the membrane pump device. Switching to operating state 2, where the first valve 300a and the fourth valve 300d are closed, and the second valve 300b and the third valve 300c are open, the power source (such as air source 200) generates gas pressure to pump the drug solution in the metering tank out of the outflow section of the working channel. By switching between operating states 1 and 2, the metered discharge of the drug solution can be achieved.

[0085] The driving power for the aforementioned drug reservoir 100 and membrane pump 400 can be independently set, or they can be driven by the same driving device. To make the drug injection system small and compact, in this embodiment, the driving power for both the drug reservoir 100 and the membrane pump 400 is gas, which can be achieved by the same gas generating device; alternatively, it can be achieved by the same liquid circulation mechanism using liquid as the power source. Specifically, it can be as follows: Figure 4 , Figure 5 and Figure 6 As shown, the drive mechanism 102 includes a piston 101 placed in the liquid storage chamber 104 and a pneumatic pipe 107 connected to the piston 101; the power source can be a hydrogen and oxygen generating device 200, the hydrogen output pipe of the hydrogen and oxygen generating device 200 is connected to the power flow channel 401 to make hydrogen the driving fluid, and the oxygen output pipe of the hydrogen and oxygen generating device 200 is connected to the pneumatic pipe to make oxygen the power to drive the piston 101 to move.

[0086] Medicine storage container

[0087] In one embodiment of the above-described medicine storage device 100, such as Figure 5 As shown, the drug reservoir 100 is a piston-type syringe, and the movement of the piston 101 is driven by a pneumatic source. The liquid storage chamber 104 is the syringe body, and a drive mechanism 102 for driving the piston is fixedly provided on one side of the syringe body. In this embodiment, the drive mechanism can specifically be a pneumatic pipe 107 connected to the piston. The pneumatic pipe 107 is connected to the oxygen output pipe of the aforementioned hydrogen and oxygen generating device 200. Oxygen produced in the hydrogen and oxygen generating device 200 enters the pneumatic pipe 107 through the oxygen output pipe. As the pressure in the pneumatic pipe 107 increases, it drives the piston to move, causing the liquid in the liquid storage chamber to flow and be pushed out from the outlet 106. More preferably, a pressure stabilizing mechanism 103 is provided at the connection between the oxygen output pipe and the pneumatic pipe 107 to stabilize the gas pressure and prevent the pressure in the oxygen output pipe and the pneumatic pipe 107 from being too high.

[0088] As one embodiment of the aforementioned voltage stabilizing mechanism, such as Figure 5 As shown, it may include a microchannel connecting a pneumatic tube 107 and an oxygen output tube, an elastic mechanism, and a valve body 106 connected to the elastic mechanism 103. Part of the valve body is placed in the microchannel and is sealed by the elastic force of the elastic mechanism 103. As an embodiment of the valve body, the channel wall constituting the microchannel integrates a first elastic membrane. A valve block 110 or a ball-shaped valve is provided on the side of the first elastic membrane away from the microchannel. The valve block 110 or the ball-shaped valve is connected to the aforementioned elastic mechanism. Initially, the elastic force of the elastic mechanism causes the valve block or the ball-shaped valve to have no pressure on the first elastic membrane, or the pressure is small (much less than the pressure required for the first elastic membrane to deform and seal the microchannel). The magnitude of the elastic force of the elastic mechanism is positively correlated with the sealing performance of the microchannel.

[0089] The aforementioned drug reservoir 100 is equipped with a detection mechanism to monitor the amount of drug in the reservoir chamber. This mechanism provides feedback on the remaining drug level, facilitating drug replacement and improving ease of use and safety. The detection mechanism may include a magnet placed on a piston that moves with it, and multiple Hall effect sensors spaced apart on the wall of the reservoir chamber. The Hall effect sensors detect the magnet to calculate the piston's position. The piston is in close contact with the inner wall of the drug injection cartridge, the magnet is fixed to the piston, and two Hall effect sensors are located on the outer wall of the drug injection cartridge, 15-20 mm apart, and symmetrical about the central axis along the length of the cartridge. When the piston moves within the cartridge, discharging the drug, the magnet moves with the piston 101 within the cartridge. The Hall effect sensors detect changes in the magnetic field strength of the magnet to calculate the piston's position within the cartridge, and then calculate the remaining drug level based on the piston's position. The detection mechanism is not limited to this; it can be other sensors capable of measuring piston movement or structures that detect via electrical signals.

[0090] Power source

[0091] As one embodiment of the power source 200, this embodiment uses a hydrogen and oxygen generating device to produce hydrogen and oxygen to drive the membrane pump and the reservoir, thereby achieving quantitative output of the drug solution. See Figure 6 As shown, the hydrogen and oxygen generating device includes a housing, a support structure 201 placed inside the housing, and a first metal electrode 202, a first metal catalyst layer 203, a membrane electrode 204, a second metal catalyst layer, and a second metal electrode 204 sequentially pressed onto the support structure 201. The support structure 201 contains a water-carrying porous material 205. The first metal electrode 202 and the second metal electrode 204 are connected to the positive electrode and the negative electrode, respectively. Both the hydrogen output pipe and the oxygen output pipe are connected to the inside of the housing. A symmetrical structure is formed on both sides of the membrane electrode 204, i.e., the first metal electrode 202, the first metal catalyst layer 203, the second metal catalyst layer, and the second metal electrode 204 are symmetrically arranged about the membrane electrode 204. The housing is provided with a sealing element 206, and a sealed hydrogen channel 208 and an oxygen channel 207, i.e., hydrogen and oxygen are generated on both sides respectively. Hydrogen is generated on the left side inside the housing and enters the power flow channel of the membrane pump device through the hydrogen channel 208. Oxygen is generated on the right side inside the housing and enters the pneumatic pipe of the drug reservoir through the oxygen channel 207. During structural assembly, the support structure 201 provides pressure to stack and press the first metal electrode 202, the first metal catalyst layer 203 and the membrane electrode 204, the second metal catalyst layer and the second metal electrode together. After the porous material 205 is wetted with water, the water comes into contact with the metal catalyst layer. When the two metal electrodes are connected to the negative and positive electrodes respectively, and when there is a voltage between the positive and negative electrodes, hydrogen is generated from the first metal catalyst layer 203 and oxygen is generated from the second metal catalyst layer.

[0092] In one embodiment, the hydrogen and oxygen generating device further includes a pressure detection mechanism disposed on the hydrogen output pipe and / or oxygen output pipe, the pressure detection mechanism being used to output a control signal to control the disappearance of voltage between the positive electrode and the negative electrode.

[0093] The aforementioned hydrogen and oxygen device is not limited to this; it can be any existing device capable of generating hydrogen and oxygen, other gas generating devices, or directly a gas circulation mechanism.

[0094] Therefore, this invention effectively overcomes the various defects in the prior art and has high industrial application value.

[0095] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A fluid valve assembly, characterized by, include: The valve body is equipped with a flexible hose for fluid to pass through; A valve block is slidably disposed in the valve body, and the valve block has a pressure-resistant portion that contacts the hose; The power mechanism includes a spring mechanism placed between the valve body and the valve block, and a tension member whose length changes when energized. The spring force of the spring mechanism keeps the pressing part pressed against the hose and deforms the hose to a blocking state. The tension member is connected to the valve block. When the tension member is energized, it shortens to drive the valve block away from the hose, so that the hose returns to the open state.

2. The fluid valve assembly of claim 1, wherein: The valve body is provided with a guide portion, and the valve block slides along the guide portion.

3. The fluid valve assembly of claim 1 or 2, wherein: The pressing part has linear pressing ridges, which are pressed onto the hose.

4. The fluid valve assembly of claim 1 or 2, wherein: The valve body is provided with a channel through which the hose passes, and the pressure-retaining part extends into the channel.

5. The fluid valve assembly of claim 1 or 2, wherein: The tensioning element is a shape memory alloy wire, with both ends of the shape memory alloy wire fixedly disposed and connected to an electrode respectively, and the shape memory alloy wire is fixedly connected to the valve block.

6. A membrane pump, characterized in that: The membrane pump includes a power flow channel and a working flow channel, a metering tank located at the junction of the power flow channel and the working flow channel, and a fluid valve assembly as described in any one of claims 1 to 5. An elastic membrane is provided at the metering tank. Both the power flow channel and the working flow channel are divided into an inlet section and an outlet section by the metering tank. The elastic membrane shifts towards the side with lower pressure in the power flow channel and the working flow channel due to pressure changes, allowing fluid to enter and exit the metering tank. The fluid valve assembly consists of two or more sets, each set containing multiple hoses. One set of hoses is connected to the inlet section of the power flow channel and the outlet section of the working flow channel, respectively, while the other set of hoses is connected to the outlet section of the power flow channel and the inlet section of the working flow channel, respectively.

7. A drug injection system, characterized in that: The drug injection system includes: A drug reservoir, comprising a liquid storage chamber and a drive mechanism disposed in the liquid storage chamber to drive the flow of liquid, the liquid reservoir having an outlet for the fluid to flow out; A membrane pump, comprising a power flow channel and a working flow channel, a metering tank located at the junction of the power flow channel and the working flow channel, and a fluid valve assembly as described in any one of claims 1 to 5, wherein an elastic membrane is provided at the metering tank, and both the power flow channel and the working flow channel are divided into an inlet section and an outlet section by the metering tank, and the elastic membrane is offset to the side of the power flow channel and the working flow channel with lower pressure due to pressure changes in the power flow channel and the working flow channel, thereby allowing fluid to enter and exit the metering tank; the fluid valve assembly comprises two or more sets, each set containing multiple hoses, one set of hoses being connected to the inlet section of the power flow channel and the outlet section of the working flow channel respectively, and the other set of hoses being connected to the outlet section of the power flow channel and the inlet section of the working flow channel respectively; A power source, which is connected to the power flow channel, and the power source contains a driving fluid that flows into the power flow channel.

8. The drug injection system according to claim 7, characterized in that: The driving mechanism includes a piston placed in the liquid storage chamber and a pneumatic tube connected to the piston; the power source is a hydrogen and oxygen generating device, the hydrogen output pipe of the hydrogen and oxygen generating device is connected to the power flow channel so that hydrogen is used as the driving fluid, and the oxygen output pipe of the hydrogen and oxygen generating device is connected to the pneumatic tube so that oxygen is used as the power to drive the piston.

9. The drug injection system according to claim 8, characterized in that: A pressure stabilizing mechanism is provided at the connection between the oxygen output pipe and the pneumatic pipe. The pressure stabilizing mechanism includes a microchannel connecting the pneumatic pipe and the oxygen output pipe, an elastic mechanism, and a valve body connected to the elastic mechanism. A portion of the valve body is placed in the microchannel and is sealed by the elastic force of the elastic mechanism.

10. The drug injection system according to claim 9, characterized in that: The hydrogen and oxygen generating device includes a housing, a support structure placed inside the housing, and a first metal electrode plate, a first metal catalyst layer and a membrane electrode, a second metal catalyst layer and a second metal electrode plate sequentially pressed onto the support structure. The support structure is provided with a water-carrying porous material. The first metal electrode plate and the second metal electrode plate are respectively connected to the positive electrode and the negative electrode. The hydrogen output pipe and the oxygen output pipe are both connected to the inside of the housing.

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