Liquid path assembly and injection device

Abstract

The invention provides a liquid path assembly and an injection device, a double-flow-direction liquid path unit comprises a first fluid channel and a second fluid channel, a channel inner cavity of the first fluid channel is used for limiting fluid to flow only in a first flow direction, and a channel inner cavity of the second fluid channel is used for limiting fluid to flow only in a second flow direction. The direction of the first flow direction is different from the direction of the second flow direction, the single-flow-direction liquid path unit comprises a one-way fluid channel, a channel inner cavity of the one-way fluid channel is used for limiting fluid to flow only in the third flow direction, and the direction of the third flow direction is the same as the direction of the first flow direction or the direction of the second flow direction. According to the liquid path assembly and the injection device, the liquid path assembly is designed in a targeted mode, so that the injection device can have the functions of synchronous injection and suction, synchronous conveying of multiple substances and the like, the pressure in a blood vessel cavity is reduced, the flow of closed substances along with blood in the injection process is limited, and deep vein thrombosis or ectopic embolism is prevented.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to fluid circuit components and injection devices. Background Technology

[0002] Varicosis, especially varicose veins in the lower extremities, is the most important disease of the venous system and one of the most common vascular diseases of the limbs. Its symptoms vary in severity. Mild cases often involve aching, heaviness, swelling, pain, fatigue, and weakness in the affected limb, which occur when standing at rest and disappear quickly after walking or lying down. This stage of the disease is still reversible.

[0003] However, as the symptoms worsen, the superficial veins in the affected limb become prominent, dilated, and even tortuous or clumped, which is more noticeable when standing. Nutritional changes occur in the skin, including thinning, scaling, pigmentation, eczematous dermatitis, liposcleroderma, and white atrophy. Due to itching, patients may scratch the affected area, leading to secondary infections and the formation of venous ulcers. Furthermore, it can cause thrombophlebitis and acute bleeding.

[0004] Varicose veins are typically treated by injecting medication into a vein to close and remove excess blood. Injection and aspiration can be performed in a controlled manner to prevent the medication from spreading to the rest of the vascular system. Simultaneous aspiration can improve or enhance the effectiveness of the medication by reducing dilution of blood or other bodily fluids, and by creating spasms and narrowing of the veins. Aspiration can also reduce the amount of debris, tissue particles, blood clots, or calcifications at the treatment site.

[0005] Currently, among the routine surgical procedures for treating varicose veins, the least invasive techniques mainly involve foam sclerotherapy and intravenous injection to close the blood vessels. Although foam sclerotherapy is relatively non-invasive, it has a high recurrence rate and potential undesirable side effects. Furthermore, depending on the specific circumstances, patients are usually required to wear compression stockings for approximately one to four weeks post-surgery.

[0006] Intravenous injection of clogging agents involves using an injection device to deliver a clogging agent through a catheter into the blood vessel that needs to be sealed. This technique offers advantages such as minimal invasiveness, simplicity of operation, and better postoperative appearance. Furthermore, it eliminates the need for compression stockings, allowing for a rapid return to normal activities. In comparison, intravenous injection for vascular closure is a safer and more efficient procedure.

[0007] However, current injection devices used for varicose vein treatment generally suffer from problems such as limited injection precision, narrow applicability, incomplete and uneven vascular closure, and ectopic embolism caused by the deviation of injected substances within the body. Furthermore, some treatment procedures involve injecting and removing fluids from the patient, or simultaneously injecting multiple medications. For example, abscess treatment can be achieved by draining pus and other debris from the body cavity and injecting saline solution to flush out any remaining residue. The injection and removal procedures need to be performed sequentially and repeatedly until all pus and other debris are removed and the body cavity is cleaned.

[0008] Regarding the operation of the above treatment process, the existing injection device is not convenient to use to perform the aforementioned operations, which affects the progress and effectiveness of the surgery. Summary of the Invention

[0009] Therefore, it is necessary to provide a fluid circuit assembly and an injection device to address at least one of the aforementioned technical problems.

[0010] This application provides a fluid circuit assembly, the fluid circuit assembly comprising:

[0011] A dual-flow fluid channel unit, comprising a first fluid channel and a second fluid channel, wherein the inner cavity of the first fluid channel is used to limit fluid flow only along a first flow direction, and the inner cavity of the second fluid channel is used to limit fluid flow only along a second flow direction, wherein the directions of the first flow direction and the second flow direction are different; and / or,

[0012] A unidirectional fluid flow unit includes a unidirectional fluid channel, the inner cavity of which is used to limit fluid flow only along a third flow direction, the direction of which is the same as the direction of the first flow direction or the direction of the second flow direction.

[0013] In one embodiment, the dual-flow liquid path unit includes:

[0014] A first fluid conduit, wherein the inner cavity of the first fluid conduit is used to form the first fluid channel, and the first flow direction is from the proximal end of the first fluid conduit toward the distal end.

[0015] An internal storage device has a storage chamber for storing fluid, a proximal port of a first fluid conduit is connected to the storage chamber of the internal storage device, and a distal port of the first fluid conduit is used to discharge the fluid stored in the storage chamber toward the distal end.

[0016] The second fluid conduit has an inner cavity that forms the second fluid channel, and the second flow direction is from the distal end of the second fluid conduit toward the proximal end.

[0017] In one embodiment, the dual-flow liquid path unit includes:

[0018] A first flow direction control element is connected to the first fluid pipeline and is used to limit the fluid in the first fluid channel to flow only along the first flow direction;

[0019] And / or,

[0020] A second flow direction control element, connected to the second fluid conduit, is used to limit the flow of fluid within the second fluid channel to flow only along the second flow direction.

[0021] In one embodiment, the first flow control element is a one-way valve; and / or,

[0022] The second flow control element is a one-way valve.

[0023] In one embodiment, the dual-flow liquid path unit includes:

[0024] A first fluid flow control device is connected to at least one of the first fluid line and the second fluid line, and is used to control the flow of fluid within at least one of the first fluid line and the second fluid line.

[0025] In one embodiment, the distal end of the first fluid conduit is oriented in the same direction as the distal end of the second fluid conduit; and / or,

[0026] The orientation of the proximal end of the first fluid line is the same as the orientation of the proximal end of the second fluid line.

[0027] In one embodiment, the unidirectional fluid path unit includes:

[0028] A fluid cylinder having an inner cavity and a distal end and a proximal end of the inner cavity, the inner cavity of the fluid cylinder being used to form the unidirectional fluid channel, the third flow direction being from the proximal end of the fluid cylinder toward the distal end.

[0029] A piston assembly is movably assembled in the inner cavity of the fluid cylinder in a piston-like manner through the proximal end opening of the fluid cylinder.

[0030] In one embodiment, the unidirectional fluid path unit includes:

[0031] The second fluid flow control device is connected to the piston and is used to control the movement of the piston in the inner cavity of the fluid cylinder, thereby driving the fluid to flow in the inner cavity of the fluid cylinder.

[0032] In one embodiment, the number of both the dual-flow liquid path unit and the uni-flow liquid path unit is configured to be at least one; and / or,

[0033] The direction of the first flow direction is opposite to the direction of the second flow direction.

[0034] This application provides an injection device, which includes the liquid circuit assembly.

[0035] In the aforementioned fluid circuit assembly and injection device, the dual-flow fluid circuit unit includes a first fluid channel and a second fluid channel. The sealed substance can flow along the first flow direction within the first fluid channel for injection into the body. Simultaneously, human blood, tissue fluid (pus), and other debris can be aspirated along the second flow direction within the second fluid channel and discharged from the body, achieving a cleansing purpose. When simultaneous delivery of multiple substances is required, both a dual-flow fluid circuit unit and a unidirectional fluid circuit unit can be equipped. One substance is delivered into the body via the first fluid channel in the dual-flow fluid circuit unit, while another substance is delivered into the body via the unidirectional fluid channel in the unidirectional fluid circuit unit, achieving simultaneous injection of two substances (drugs).

[0036] The injection device of this application features a targeted design for the fluid circuit components, enabling it to perform simultaneous injection and aspiration, as well as simultaneous delivery of multiple substances. This reduces intravascular pressure, restricts the flow of occlusive substances with the blood during injection, and prevents the occurrence of deep venous thrombosis (DVT) or ectopic embolism. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the liquid circuit assembly provided in one embodiment of this application.

[0038] Figure 2 This is a schematic diagram of the structure of an injection device provided in one embodiment of this application.

[0039] Icon labels:

[0040] 1000, Dual-flow hydraulic system unit; 2000, Single-flow hydraulic system unit; 3000, Power unit;

[0041] 1001, First fluid channel; 1002, Second fluid channel; 1100, First fluid pipeline; 1200, Second fluid pipeline; 1300, First flow direction control element; 1400, Second flow direction control element; 1500, First liquid flow control device;

[0042] 100. First flow direction; 200. Second flow direction;

[0043] 2001, One-way fluid channel; 2100, Fluid cylinder; 2200, Piston component; 2300, Second fluid flow control device;

[0044] 300. Third flow direction. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0047] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0051] To more clearly describe the structure of the fluid path components and the injection device, the term "distal" is defined herein as the end furthest from the operator during the surgical procedure, and "proximal" as the end closest to the operator during the surgical procedure. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0052] See Figure 1 and Figure 2As shown, this application provides an injection device, which includes a fluid path assembly and a housing for assembling the fluid path assembly. When the fluid path assembly is assembled within the housing, it constitutes an injection device for delivering occlusive substances. The injection device of this application, through targeted design of the fluid path assembly, enables the injection device to perform simultaneous injection and aspiration, and simultaneous delivery of multiple substances, thereby reducing intravascular pressure, limiting the flow of occlusive substances with the blood during injection, and preventing the occurrence of deep venous thrombosis (DVT) or ectopic embolism.

[0053] In one embodiment, such as Figure 1 and Figure 2 As shown, the fluid path assembly may include at least one of a bidirectional fluid path unit 1000 and a unidirectional fluid path unit 2000. The fluid path assembly may include only the bidirectional fluid path unit 1000, in which case the number of bidirectional fluid path units 1000 may be one or more. Alternatively, the fluid path assembly may include only the unidirectional fluid path unit 2000, in which case the number of unidirectional fluid path units 2000 may be one or more. Or, the fluid path assembly may simultaneously include both bidirectional fluid path units 1000 and unidirectional fluid path units 2000, in which case the number of both bidirectional fluid path units 1000 and unidirectional fluid path units 2000 may be set to one or more as required.

[0054] The aforementioned dual-flow fluid channel unit 1000 can be used to achieve bidirectional synchronous transport of fluids, for example, simultaneously injecting occlusive substances and aspirating human blood, tissue fluid (pus), and other debris. In one embodiment, the dual-flow fluid channel unit 1000 includes a first fluid channel 1001 and a second fluid channel 1002. The inner cavity of the first fluid channel 1001 is used to limit the flow of fluid only along a first flow direction 100, and the inner cavity of the second fluid channel 1002 is used to limit the flow of fluid only along a second flow direction 200. The directions of the first flow direction 100 and the second flow direction 200 are different. Therefore, occlusive substances can flow along the first flow direction 100 within the first fluid channel 1001 for injection into the body, while human blood, tissue fluid (pus), and other debris can be aspirated along the second flow direction 200 within the second fluid channel 1002 and discharged from the body to the outside, achieving a cleaning purpose.

[0055] The aforementioned unidirectional fluid flow unit 2000 only enables unidirectional fluid transport and is configured to deliver closed substances or other fluid substances that need to be injected into the body. In one embodiment, the unidirectional fluid flow unit 2000 includes a unidirectional fluid channel 2001. The inner cavity of the unidirectional fluid channel 2001 is used to limit the fluid flow only along a third flow direction 300, which is the same as the direction of the first flow direction 100 or the direction of the second flow direction 200. For example, when the direction of the third flow direction 300 is limited to the same as the direction of the first flow direction 100, when multiple substances need to be delivered simultaneously, a dual-flow fluid flow unit 1000 and a unidirectional fluid flow unit 2000 can be equipped in the injection device simultaneously. One substance is delivered into the body using the first fluid channel 1001 in the dual-flow fluid flow unit 1000, while another substance is delivered into the body using the unidirectional fluid channel 2001 in the unidirectional fluid flow unit 2000, thus achieving simultaneous injection of two substances (drugs).

[0056] The first fluid channel 1001 and the second fluid channel 1002 included in the dual-flow liquid channel unit 1000 can be formed by various structures. For example, the dual-flow liquid channel unit 1000 can include a dual-flow liquid channel body, in which two independent channels are opened, and the two independent channels are respectively used to form the first fluid channel 1001 and the second fluid channel 1002.

[0057] Alternatively, in one embodiment, the dual-flow fluid circuit unit 1000 may include a first fluid conduit 1100 and a second fluid conduit 1200. The inner cavity of the first fluid conduit 1100 is used to form a first fluid channel 1001, and the first flow direction 100 is from the proximal end of the first fluid conduit 1100 to the distal end. The inner cavity of the second fluid conduit 1200 is used to form a second fluid channel 1002, and the second flow direction 200 is from the distal end of the second fluid conduit 1200 to the proximal end.

[0058] In the above embodiments, the orientation of the distal end of the first fluid conduit 1100 can be defined to be the same as the orientation of the distal end of the second fluid conduit 1200, and the orientation of the proximal end of the first fluid conduit 1100 can be defined to be the same as the orientation of the proximal end of the second fluid conduit 1200. This defines the direction of the first flow direction 100 as opposite to the direction of the second flow direction 200, preventing backflow in the overall fluid path defined by the first flow direction 100 and the second flow direction 200, thus avoiding contamination of the transported material or clinical infection. The first fluid conduit 1100 and the second fluid conduit 1200 can be different types of conduits such as flexible tubes, rigid tubes, straight tubes, and curved tubes. Furthermore, those skilled in the art can adjust the relative positional relationship of the first fluid conduit 1100 and the second fluid conduit 1200 according to actual needs, thereby adjusting the relative directional relationship of the first flow direction 100 and the second flow direction 200, which is not limited here.

[0059] The dual-flow fluid unit 1000 may further include an internal storage device having a storage chamber for storing fluid, such as a closure substance to be injected into the body or other fluid substances (drugs) to be injected into the body, without limitation. Therefore, the proximal end of the first fluid conduit 1100 can be connected to the storage chamber of the internal storage device, and the distal end of the first fluid conduit 1100 can be used to discharge the fluid stored in the storage chamber in a distal direction, allowing the first fluid conduit 1100 to be used to inject the fluid stored in the storage chamber into the body. Simultaneously, the distal end of the first fluid conduit 1100 can also be connected to an external catheter.

[0060] In one embodiment, the dual-flow fluid circuit unit 1000 further includes a first flow direction control element 1300 and a second flow direction control element 1400. The first flow direction control element 1300 is connected to the first fluid conduit 1100 and is used to limit the fluid in the first fluid channel 1001 to flow only along the first flow direction 100. For example, the first flow direction control element 1300 can be selected as a one-way valve. The second flow direction control element 1400 is connected to the second fluid conduit 1200 and is used to limit the fluid in the second fluid channel 1002 to flow only along the second flow direction 200. For example, the second flow direction control element 1400 can be selected as a one-way valve. The dual-flow fluid circuit unit 1000 also includes a first fluid flow control device 1500, which is connected to at least one of the first fluid conduit 1100 and the second fluid conduit 1200, and is used to control the flow of fluid within at least one of the first fluid conduit 1100 and the second fluid conduit 1200. The first fluid flow control device 1500 can be selected as a fluid pump or other drive control device.

[0061] The unidirectional fluid channel 2001 included in the unidirectional fluid path unit 2000 can also be formed by various structures. For example, in one embodiment, the unidirectional fluid path unit 2000 can adopt a piston-driven form of a syringe. In this case, the unidirectional fluid path unit 2000 includes a fluid cylinder 2100 and a piston 2200. The fluid cylinder 2100 has an inner cavity and a distal and proximal openings connecting the inner cavity. The inner cavity of the fluid cylinder 2100 is used to form the unidirectional fluid channel 2001. In this case, the third flow direction 300 can be defined as the direction from the proximal opening of the fluid cylinder 2100 towards the distal opening. The piston 2200 can be movably assembled in the inner cavity of the fluid cylinder 2100 in a piston-like manner through the proximal opening of the fluid cylinder 2100. As the piston 2200 reciprocates within the inner cavity, the pressure within the inner cavity can be changed, thereby driving the fluid. The unidirectional liquid path unit 2000 may also include a second liquid flow control device 2300, which is connected to the piston 2200 and is used to control the movement of the piston 2200 in the inner cavity of the fluid cylinder 2100, thereby driving the fluid to flow in the inner cavity of the fluid cylinder 2100.

[0062] The first fluid flow control device 1500 and the second fluid flow control device 2300 can be powered by one or more power devices 3000. The power devices 3000 can be configured as manual drive devices or automatic electric drive devices, and can also be configured to have multiple power adjustment levels to achieve different levels of output accuracy and ratio.

[0063] Furthermore, since the design capacity of both the first fluid channel 1001 and the second fluid channel 1002 in the dual-flow fluid circuit unit 1000 is a single-drive volume, the design capacity of the first fluid channel 1001 and the second fluid channel 1002 can be designed to be relatively small. This results in a smaller single-drive volume, allowing for precise adjustment of the fluid flow when driving fluid within the first fluid channel 1001 and the second fluid channel 1002 each time. Simultaneously, the single-drive capacity of the unidirectional fluid channel 2001 in the unidirectional fluid circuit unit 2000 is also a single-drive volume. This single-drive volume can be adjusted based on the single-drive capacity, making the amount of fluid driven within the unidirectional fluid circuit unit 2000 highly flexible.

[0064] Based on the driving design of the dual-flow liquid path unit 1000 and the unidirectional liquid path unit 2000, the design of the conveying ratio between the two is less restricted, thus a larger liquid path conveying ratio can be achieved in a smaller space. This makes the adjustable range of the conveying ratio of the dual-flow liquid path unit 1000 and the unidirectional liquid path unit 2000 large. That is, the adjustable range of the conveying ratio between the first fluid channel 1001, the second fluid channel 1002 and the unidirectional fluid channel 2001 is large, the accuracy is high, and the operation is efficient and convenient.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A fluid circuit assembly, characterized in that, The fluid circuit assembly includes: A dual-flow fluid channel unit, comprising a first fluid channel and a second fluid channel, wherein the inner cavity of the first fluid channel is used to limit fluid flow only along a first flow direction, and the inner cavity of the second fluid channel is used to limit fluid flow only along a second flow direction, wherein the directions of the first flow direction and the second flow direction are different; and / or, A unidirectional fluid flow unit includes a unidirectional fluid channel, the inner cavity of which is used to limit fluid flow only along a third flow direction, the direction of which is the same as the direction of the first flow direction or the direction of the second flow direction.

2. The fluid circuit assembly according to claim 1, characterized in that, The dual-flow liquid path unit includes: A first fluid conduit, wherein the inner cavity of the first fluid conduit is used to form the first fluid channel, and the first flow direction is from the proximal end of the first fluid conduit toward the distal end. An internal storage device has a storage chamber for storing fluid, a proximal port of a first fluid conduit is connected to the storage chamber of the internal storage device, and a distal port of the first fluid conduit is used to discharge the fluid stored in the storage chamber toward the distal end. The second fluid conduit has an inner cavity that forms the second fluid channel, and the second flow direction is from the distal end of the second fluid conduit toward the proximal end.

3. The fluid circuit assembly according to claim 2, characterized in that, The dual-flow liquid path unit includes: A first flow direction control element is connected to the first fluid pipeline and is used to limit the fluid in the first fluid channel to flow only along the first flow direction; And / or, A second flow direction control element, connected to the second fluid conduit, is used to limit the flow of fluid within the second fluid channel to flow only along the second flow direction.

4. The fluid circuit assembly according to claim 3, characterized in that, The first flow direction control element is a check valve; and / or, The second flow control element is a one-way valve.

5. The fluid circuit assembly according to claim 3, characterized in that, The dual-flow liquid path unit includes: A first fluid flow control device is connected to at least one of the first fluid line and the second fluid line, and is used to control the flow of fluid within at least one of the first fluid line and the second fluid line.

6. The fluid circuit assembly according to claim 2, characterized in that, The distal end of the first fluid conduit is oriented in the same direction as the distal end of the second fluid conduit; and / or, The orientation of the proximal end of the first fluid line is the same as the orientation of the proximal end of the second fluid line.

7. The fluid circuit assembly according to claim 1, characterized in that, The unidirectional fluid path unit includes: A fluid cylinder having an inner cavity and a distal end and a proximal end of the inner cavity, the inner cavity of the fluid cylinder being used to form the unidirectional fluid channel, the third flow direction being from the proximal end of the fluid cylinder toward the distal end. A piston assembly is movably assembled in the inner cavity of the fluid cylinder in a piston-like manner through the proximal end opening of the fluid cylinder.

8. The fluid circuit assembly according to claim 7, characterized in that, The unidirectional fluid path unit includes: The second fluid flow control device is connected to the piston and is used to control the movement of the piston in the inner cavity of the fluid cylinder, thereby driving the fluid to flow in the inner cavity of the fluid cylinder.

9. The fluid circuit assembly according to claim 1, characterized in that, The number of both the dual-flow liquid path unit and the uni-flow liquid path unit is configured to be at least one; and / or, The direction of the first flow direction is opposite to the direction of the second flow direction.

10. An injection device, characterized in that, The injection device includes the fluid circuit assembly as described in any one of claims 1-9.

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