Fluid backflow prevention valve having single unit, fluid backflow prevention valve having module unit, and liquid drug injection system having fluid backflow prevention valve

Abstract

The present invention relates to a fluid backflow prevention valve having a fluid channel inside a three-dimensional shape. The fluid backflow prevention valve comprises: a main fluid channel (130) in which an inlet (110) and an outlet (120) communicate with each other; a bypass island (140) formed to be spaced apart from the main fluid channel (130); and a branch fluid channel (150) branched from a start point (151) provided on one side of the rear side of a route of the main fluid channel (130), bypassing the bypass island (140), and then connected to an end point (152) provided on the other side of the front side of the route of the main fluid channel (130) in a direction opposite to the fluid movement direction of the main fluid channel (130), wherein a fluid channel round extension part (160) provided to extend roundly to have a preconfigured radius (R) toward the outside of the fluid channel from the start point (151) is further provided.

Description

Liquid drug injection system with a fluid check valve equipped with a single unit, a fluid check valve equipped with a modular unit, and a fluid check valve equipped with a fluid check valve

[0001] The present invention relates to a fluid check valve having a single unit, a fluid check valve having a module unit, and a liquid drug injection system having a fluid check valve.

[0002] A valve is installed in a pipe or equipment to block or control the flow of fluid.

[0003] The Tesla valve is a valve designed by Nikola Tesla that functions as a check valve for fluids using only the shape of a pipe without any moving parts.

[0004] Figure 1 is a schematic diagram of a conventional Tesla valve, where Figure 1a shows forward flow and Figure 1b shows reverse flow. Figure 1a shows that in forward flow, the fluid flows almost in a straight line without any obstruction. However, in reverse flow as shown in Figure 1b, the fluid that has moved along a branched path moves back to the main path, thereby obstructing the flow of the fluid in the main path.

[0005] The fluid backflow prevention valve and liquid drug injection system according to the present invention have the following problems to be solved.

[0006] First, we propose an improved structure that prevents backflow even better than the existing Tesla valve.

[0007] Second, the three-dimensional shape is provided with a variety of check valves.

[0008] Third, we want to prevent backflow in liquid drug injection systems.

[0009] The problems solved by the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

[0010] The present invention relates to a fluid check valve having a flow path provided inside a three-dimensional shape, comprising: a main flow path having an inlet and an outlet connected thereto; a bypass island formed spaced apart from the main flow path; and a branch flow path branched at a point provided at a rear side of the main flow path, and after bypassing the bypass island, connected in the opposite direction of the fluid movement direction of the main flow path at a terminal point provided at the front side of the main flow path; and a fluid check valve having a single unit characterized in that a flow path round expansion part (160) is further provided that is provided to be rounded and extended to have a preset radius (R) outside the flow path at the point.

[0011] In the present invention, the bypass island is provided in a round shape corresponding to the branch flow path, but may be provided in a tapered shape in the direction of the starting point.

[0012]

[0013] The present invention is a fluid check valve having a flow path inside a three-dimensional shape, comprising: a main flow path having an inlet and an outlet connected thereto; a bypass island formed spaced apart from the main flow path; and a branch flow path branching off at a point provided on a rear side of the main flow path, bypassing the bypass island, and connecting in the opposite direction of the fluid movement direction of the main flow path at a terminal point provided on the front side of the main flow path; and a single unit characterized in that a wide flow path portion wider than the flow path cross-sectional areas of the main flow path and the bypass flow path is further provided at the point.

[0014] In the present invention, the bypass island may be provided in a circular shape corresponding to the branch flow path.

[0015] In the present invention, the wide-width euro section may further include an auxiliary island having a circular shape with a smaller diameter than the bypass island.

[0016]

[0017] The present invention relates to a fluid check valve having a flow path formed of a unit module portion in which a plurality of identical valve units are arranged in a transverse direction repeatedly within a three-dimensional shape, wherein the valve unit comprises: a main flow path having an inlet and an outlet connected to each other; a circular bypass island formed spaced apart from the main flow path; a branch flow path branched at a point provided on one rear side of the main flow path, and after bypassing the bypass island, connected in a direction opposite to the fluid movement direction of the main flow path at a terminal point provided on the other front side of the main flow path; and a wide flow path portion wider than the flow path cross-sectional areas of the main flow path and the bypass flow path at the point, wherein each valve unit is characterized in that it is arranged in a transverse direction repeatedly so that the outlet of one valve unit communicates with the inlet of the other valve unit.

[0018] In the present invention, the wide-width euro section may further include an auxiliary island having a circular shape with a smaller diameter than the circular bypass island.

[0019] In the present invention, it is preferable that the three-dimensional shape is any one of a cylinder, an ellipsoid, or a polyhedron.

[0020]

[0021] The present invention is a fluid check valve in which an upper unit module part and a lower unit module part in which identical valve units are repeatedly arranged in a horizontal direction are vertically coupled and a flow path is provided inside a three-dimensional shape, wherein the valve unit comprises a main flow path having an inlet and an outlet connected thereto; a circular bypass island formed spaced apart from the main flow path; a branch flow path branched at a point provided at a rear side of the main flow path, and after bypassing the bypass island, connected in the reverse direction of the fluid movement direction of the main flow path at a terminal point provided at the front side of the main flow path; And at the above point, a wide-width flow path section wider than the flow cross-sectional areas of the main flow path and the bypass flow path is provided, and each valve unit is arranged in a horizontal direction repeatedly so that the outlet of one valve unit communicates with the inlet of the other valve unit, and when the upper and lower parts are connected, the main flow path of the upper unit module part is arranged on the lower side, and the main flow path of the lower unit module part is arranged on the upper side, so that the respective main flow paths are connected so as to overlap each other, and the respective bypass islands of the upper unit module part and the lower unit module part are arranged in an up-and-down staggered manner.

[0022] In the present invention, the wide-width euro section may further include an auxiliary island having a circular shape with a smaller diameter than the circular bypass island.

[0023] In the present invention, it is preferable that the three-dimensional shape is any one of a cylinder, an ellipsoid, or a polyhedron.

[0024]

[0025] The present invention relates to a fluid check valve having a plurality of internal spaces radially partitioned within a cylindrical shape, each of which has a flow path, wherein an upper unit module part and a lower unit module part, in which identical valve units are horizontally arranged repeatedly, are vertically coupled, and the valve unit comprises: a main flow path having an inlet and an outlet connected thereto; a circular bypass island formed spaced apart from the main flow path; a branch flow path branched at a point provided at a rear side of the main flow path, and after bypassing the bypass island, connected in the reverse direction of the fluid movement direction of the main flow path at a terminal point provided at the front side of the main flow path; And at the above point, a wide-width flow path section wider than the flow cross-sectional areas of the main flow path and the bypass flow path is provided, and each valve unit is arranged in a horizontal direction repeatedly so that the outlet of one valve unit communicates with the inlet of the other valve unit, and when the upper and lower parts are connected, the main flow path of the upper unit module part is arranged on the lower side, and the main flow path of the lower unit module part is arranged on the upper side, so that the respective main flow paths are connected so as to overlap each other, and the respective bypass islands of the upper unit module part and the lower unit module part are arranged in an up-and-down staggered manner.

[0026] In the present invention, the wide-width euro section may further include an auxiliary island having a circular shape with a smaller diameter than the circular bypass island.

[0027]

[0028] The present invention relates to a liquid drug injection system comprising: a connecting portion communicating with a liquid drug storage portion; an injection chamber portion into which liquid drug moved from the liquid drug storage portion is introduced through the connecting portion; a connecting hose through which liquid drug contained in the injection chamber portion is discharged; and a needle portion for injecting the drug discharged through the connecting hose into a patient's body, wherein a fluid check valve according to any one of claims 1, 3, 6, 9, or 12 is provided on one side of the connecting hose, thereby preventing backflow of the liquid drug.

[0029] In the present invention, a flow control unit may be further provided on one side of the connecting hose to control the flow rate of the liquid substance injected.

[0030] The fluid backflow prevention valve and liquid drug injection system according to the present invention have the following effects.

[0031] First, by utilizing the Euro round expansion section, wide Euro section, and auxiliary island configuration, turbulence is created in the internal Euro, thereby enhancing the backflow prevention function.

[0032] Second, there is an effect in that the check valve is provided in various forms, such as a single unit and a module unit provided inside a three-dimensional shape, or a cylindrical three-dimensional shape with an interior radially divided.

[0033] Third, a fluid backflow prevention valve is provided on one side of the connecting hose in the liquid drug injection system, which has the effect of preventing backflow when injecting the liquid drug.

[0034] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

[0035] Fig. 1 is a schematic diagram of a conventional Tesla valve, where Fig. 1a shows forward flow and Fig. 1b shows reverse flow.

[0036] Figure 2 illustrates a first embodiment of the present invention. Figures 2a and 2b are schematic diagrams of a first embodiment of a fluid check valve according to the present invention, showing an internal flow path by cutting a three-dimensional shape.

[0037] Figure 3 is a front view of the first embodiment, showing the Euro round extension (160).

[0038] Fig. 4 is a fluid flow diagram of the first embodiment. In contrast to the forward flow of Fig. 4a, it can be confirmed that a turbulent phenomenon occurs in the euro round expansion part (160) during the reverse flow of Fig. 4b, thereby preventing reverse flow.

[0039] Fig. 5 illustrates a second embodiment of the present invention. Figs. 5a and 5b are schematic diagrams of a second embodiment of a fluid check valve according to the present invention, showing an internal flow path by cutting a three-dimensional shape.

[0040] Figure 6 is a front view of the second embodiment, showing a wide-width euro section (170).

[0041] Fig. 7 is a fluid flow diagram of the second embodiment. In contrast to the forward flow of Fig. 7a, it can be confirmed that a turbulent phenomenon occurs in the wide flow path (170) in the reverse flow of Fig. 7b, thereby preventing reverse flow.

[0042] Fig. 8 illustrates a third embodiment of the present invention. Figs. 8a and 8b are schematic diagrams of a third embodiment of a fluid check valve according to the present invention, showing an internal flow path by cutting a three-dimensional shape.

[0043] Figure 9 is a cross-sectional view of the third embodiment, showing a wide-width guage section (170) and an auxiliary island (141).

[0044] Fig. 10 is a fluid flow diagram of the third embodiment. In contrast to the forward flow of Fig. 10a, it can be confirmed that a turbulent flow phenomenon occurs between the wide flow path (170) and the bypass island (140) and the auxiliary island (141) in the reverse flow of Fig. 10b, thereby preventing reverse flow.

[0045] Fig. 11 illustrates a fourth embodiment of the present invention. Fig. 11a illustrates a structure in which an inlet (110) of one valve unit (10a) according to the second embodiment is connected to an outlet (120b) of another valve unit (10b). Fig. 11b illustrates that when Fig. 11a is continuously connected, a unit module portion (20) is provided. Fig. 11c illustrates a fluid check valve (20) equipped with the unit module portion (20) of Fig. 11b.

[0046] Fig. 12 illustrates a fifth embodiment of the present invention. Fig. 12a illustrates a structure in which an inlet (110a) of one valve unit (10a) according to the third embodiment is connected to an outlet (120b) of another valve unit (10b). Fig. 12b illustrates that when Fig. 12a is continuously connected, a unit module portion (20) is provided. Fig. 12c illustrates a fluid check valve (20) equipped with the unit module portion (20) of Fig. 12b.

[0047] Fig. 13a illustrates a sixth embodiment of the present invention. Fig. 13a illustrates an upper unit module (20a) with a structure connected to the second embodiment. Fig. 13b illustrates a lower unit module (20b) with a structure in which the upper unit module (20a) is inverted downward. Fig. 13c illustrates a structure in which the upper unit module (20a) and the lower unit module (20b) are vertically connected.

[0048] Fig. 14a shows that the upper unit module (20a) of Fig. 13a is implemented in a three-dimensional shape. Figs. 14b and 14c show that the upper and lower combined structure of Fig. 13c is implemented in a three-dimensional shape.

[0049] Fig. 15 is a cross-sectional view of the sixth embodiment, showing the upper unit module section (20a), the lower unit module section (20b), the bypass island (140), and the wide passage section (170).

[0050] Fig. 16 is a fluid flow diagram of the sixth embodiment, where Fig. 16a shows a forward flow and Fig. 16b shows a reverse flow.

[0051] Fig. 17 illustrates a seventh embodiment of the present invention. Fig. 17a illustrates that the upper unit module (20a) connected to the valve unit according to the third embodiment is implemented in a three-dimensional shape. Figs. 17b and 17c illustrate that the upper unit module (20a) and the lower unit module (20b) according to the third embodiment are implemented in a three-dimensional shape in a structure in which they are vertically connected.

[0052] Fig. 18 is a cross-sectional view of the seventh embodiment, showing the upper unit module section (20a), the lower unit module section (20b), the bypass island (140), the auxiliary island (141), and the wide passage section (170).

[0053] Fig. 19 is a fluid flow diagram of the seventh embodiment, where Fig. 19a shows a forward flow and Fig. 19b shows a reverse flow.

[0054] Fig. 20 shows an embodiment in which the unit module parts (20) according to the present invention are arranged in an overlapping manner. Fig. 20a shows a fluid backflow prevention valve (20) according to the sixth embodiment. Fig. 20b shows a structure in which the fluid backflow prevention valves (20) of Fig. 20a are independently provided but arranged left and right. Fig. 20c shows a structure in which two fluid backflow prevention valves (20) are arranged vertically in one three-dimensional shape.

[0055] Fig. 21 illustrates an embodiment of a fluid check valve in which a plurality of internal spaces radially partitioned within a cylindrical shape are each provided with a flow path. Fig. 21a illustrates an eighth embodiment, in which three radially partitioned internal spaces each have an independent flow path. Fig. 21b illustrates a ninth embodiment, in which six radially partitioned internal spaces each have an independent flow path.

[0056] Figures 22a to 22c are partial cutaway views of the eighth embodiment, illustrating the internal flow path. Figure 22d is a partial cutaway view of the ninth embodiment, illustrating the internal flow path.

[0057] Fig. 23 is a fluid flow diagram of the eighth embodiment, where Fig. 23a shows a forward flow and Fig. 23b shows a reverse flow.

[0058] Figure 24 is a schematic diagram of a liquid drug injection system equipped with a fluid backflow prevention valve (6) according to the present invention.

[0059] [Explanation of symbols]

[0060] 10: Valve unit

[0061] 20: Unit module section

[0062] 20a: Upper unit module

[0063] 20b: Lower unit module

[0064] 110: Inlet

[0065] 120: Outlet

[0066] 130: Main Euro

[0067] 140: Detour Island

[0068] 141: Auxiliary Island

[0069] 150: Quarterly Euro

[0070] 151: The starting point of the quarterly euro

[0071] 152: End of quarterly euro

[0072] 160: Euro Round Expansion

[0073] 170: Wide Euro section

[0074] 1: Liquid drug storage compartment

[0075] 2: First connector

[0076] 3: Injection chamber

[0077] 4: Second connector

[0078] 5: Needle part

[0079] 6: Fluid backflow prevention valve

[0080] 7: Flow control unit

[0081] The present invention relates to a fluid check valve having a flow path provided inside a three-dimensional shape, comprising: a main flow path having an inlet and an outlet connected thereto; a bypass island formed spaced apart from the main flow path; and a branch flow path branched at a point provided at a rear side of the main flow path, and after bypassing the bypass island, connected in the opposite direction of the fluid movement direction of the main flow path at a terminal point provided at the front side of the main flow path; and a fluid check valve having a single unit characterized in that a flow path round expansion part (160) is further provided that is provided to be rounded and extended to have a preset radius (R) outside the flow path at the point.

[0082] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described so that those skilled in the art can easily implement them. As will be readily apparent to those skilled in the art, the embodiments described below may be modified in various ways without departing from the spirit and scope of the present invention. Wherever possible, identical or similar parts are indicated in the drawings using the same reference numerals.

[0083] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the invention. As used herein, the singular forms "a," "an," and "the" also include the plural forms, unless the context clearly dictates otherwise.

[0084] As used herein, the term "comprising" means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0085] All terms, including technical and scientific terms, used in this specification have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains. Terms defined in the dictionary are further interpreted to have meanings consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or overly formal unless otherwise defined.

[0086] Expressions of direction used in this specification, such as front / back / left / right, up / down, and longitudinal / lateral, can be interpreted with reference to the directions disclosed in the drawings.

[0087]

[0088] The present invention will be described below with reference to the drawings. Note that the drawings may be exaggerated to illustrate the features of the present invention. In such cases, it is preferable to interpret them in light of the overall intent of this specification.

[0089]

[0090] The present invention proposes an idea to improve the fundamental principles of the Tesla valve, further enhancing its ability to prevent backflow. Essentially, the Tesla valve is designed to provide low resistance when fluid flows forward and high resistance when it flows backward. The present invention proposes a method to enhance performance and reduce size by adding additional features to the existing Tesla valve.

[0091] From a backflow prevention perspective, the present invention's key differentiating factor is the formation of rotating turbulence in the backflowing fluid. This turbulence further increases the resistance of the fluid as it flows backward, thereby more effectively preventing backflow.

[0092] Turbulence creates irregular, rotating motions in fluid flow, allowing for more efficient dissipation of the fluid's kinetic energy. This allows for higher resistance than conventional Tesla valves, allowing for smaller valve sizes while maintaining performance.

[0093] The present invention is designed to enhance the effectiveness of preventing fluid backflow by incorporating turbulence into the existing Tesla valve structure, while simultaneously reducing the device's size. This allows for a more compact yet effective backflow prevention device.

[0094]

[0095] Several embodiments are provided in the fluid check valve according to the present invention.

[0096] First, first to third embodiments are provided regarding the single valve unit (10) itself.

[0097] Next, the fourth and fifth embodiments are provided regarding a fluid backflow prevention valve in which a plurality of valve units (10) are connected left and right.

[0098] Next, the sixth and seventh embodiments are provided regarding a fluid backflow prevention valve in which an upper unit module part (20a) and a lower unit module part (20b) are vertically connected.

[0099] Next, the eighth and ninth embodiments are provided regarding a fluid check valve in which a flow path is formed in a radially partitioned space inside a cylinder.

[0100] Accordingly, we would like to explain each example in order.

[0101]

[0102] Hereinafter, a first embodiment of a fluid backflow prevention valve according to the present invention is described.

[0103] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0104] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0105]

[0106] A fluid check valve according to a first embodiment is a fluid check valve having a flow path provided inside a three-dimensional shape, comprising: a main flow path (130) in which an inlet (110) and an outlet (120) are connected; a bypass island (140) formed spaced apart from the main flow path (130); and a branch flow path (150) branched at a point (151) provided at a rear side of the main flow path (130), bypassing the bypass island (140), and connected in the opposite direction of the fluid movement direction of the main flow path (130) at an end point (152) provided at a front side of the main flow path (130), and further comprising a flow path round expansion part (160) that is provided to be roundly expanded to have a preset radius (R) outside the flow path from the point (151).

[0107] In the first embodiment, the bypass island (140) is provided in a round shape corresponding to the branch path (150), but may be provided in a tapered shape in the direction of the starting point (151) (see FIG. 2).

[0108]

[0109] Figure 2 illustrates a first embodiment of the present invention. Figures 2a and 2b are schematic diagrams of a first embodiment of a fluid check valve according to the present invention, showing an internal flow path by cutting a three-dimensional shape. Figure 3 is a front view of the first embodiment, showing a flow path round expansion part (160).

[0110] Fig. 4 is a fluid flow diagram of the first embodiment. In contrast to the forward flow of Fig. 4a, it can be seen that a turbulent flow phenomenon occurs in the euro round expansion portion (160) in the reverse flow of Fig. 4b, thereby preventing reverse flow. Looking at the dotted line portion of Fig. 4b, it can be seen that when the fluid flows backward, turbulence occurs as indicated by the blue arrow, resisting the pressure and flow of the reversely flowing fluid.

[0111]

[0112]

[0113] Below, a second embodiment of a fluid backflow prevention valve according to the present invention is described.

[0114] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0115] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0116] A fluid check valve according to a second embodiment is a fluid check valve having a flow path provided inside a three-dimensional shape, comprising: a main flow path (130) in which an inlet (110) and an outlet (120) are connected; a bypass island (140) formed spaced apart from the main flow path (130); and a branch flow path (150) branched at a point (151) provided at a rear side of the main flow path (130), bypassing the bypass island (140), and connected in the opposite direction of the fluid movement direction of the main flow path (130) at an end point (152) provided at a front side of the main flow path (130), characterized in that a wide flow path portion (170) wider than the flow cross-sectional areas of the main flow path and the bypass flow path is further provided at the point (151).

[0117]

[0118] In the second embodiment, the bypass island (140) may be provided in a circular shape corresponding to the branch flow path (150) (see FIG. 5).

[0119]

[0120] Figure 5 illustrates a second embodiment of the present invention. Figures 5a and 5b are schematic diagrams of a second embodiment of a fluid check valve according to the present invention, showing the internal flow path by cutting a three-dimensional figure. Figure 6 is a front view of the second embodiment, showing a wide flow path section (170).

[0121] Fig. 7 is a fluid flow diagram of the second embodiment. In contrast to the forward flow of Fig. 7a, it can be seen that in the reverse flow of Fig. 7b, a turbulent phenomenon occurs in the wide passage section (170) and reverse flow is prevented. Looking at the dotted line portion of Fig. 7b, it can be seen that the passage, which has been widened like a whistle, generates greater turbulence and resists the pressure and flow of the reversely flowing fluid.

[0122]

[0123]

[0124] Below, a third embodiment of a fluid backflow prevention valve according to the present invention is described.

[0125] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0126] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0127] The fluid backflow prevention valve according to the third embodiment is an embodiment in which, in the fluid backflow prevention valve according to the second embodiment, an auxiliary island (141) having a circular shape with a smaller diameter than the bypass island (140) is further provided in the wide flow path section (170).

[0128] Figure 8 illustrates a third embodiment of the present invention. Figures 8a and 8b are schematic diagrams of a third embodiment of a fluid check valve according to the present invention, showing the internal flow path by cutting a three-dimensional shape. Figure 9 is a cross-sectional view of the third embodiment, showing a wide flow path section (170) and an auxiliary island (141).

[0129] Fig. 10 is a fluid flow diagram of the third embodiment. In contrast to the forward flow of Fig. 10a, it can be confirmed that in the reverse flow of Fig. 10b, a turbulent flow phenomenon occurs between the wide passage section (170) and the bypass island (140) and the auxiliary island (141), thereby preventing backflow. As shown in Fig. 10b, since small turbulences are formed in several places, the resistance to backflow is greatly increased, and the backflow prevention performance can also be greatly increased.

[0130]

[0131]

[0132] Below, a fourth embodiment of a fluid backflow prevention valve according to the present invention is described.

[0133] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0134] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0135] A fluid check valve according to a fourth embodiment is a fluid check valve having a flow path made of a unit module portion (20) in which a plurality of identical valve units (10) are arranged in a transverse direction repeatedly inside a three-dimensional shape, wherein the valve unit (10) comprises: a main flow path (130) in which an inlet (110) and an outlet (120) are connected; a circular bypass island (140) formed spaced apart from the main flow path (130); a branch flow path (150) branched at a starting point (151) provided at a rear side of the main flow path (130), bypassing the bypass island (140), and connected in the reverse direction of the fluid movement direction of the main flow path (130) at an end point (152) provided at a front side of the main flow path (130); And at the above point (151), a wide-width flow path (170) wider than the flow cross-sectional area of ​​the main flow path and the bypass flow path is provided, and each valve unit (10) is a fluid check valve equipped with a module unit characterized in that the outlet (120) of one valve unit is repeatedly arranged in a horizontal direction so that it communicates with the inlet (110) of the other valve unit.

[0136]

[0137] Fig. 11 illustrates a fourth embodiment of the present invention. Fig. 11a illustrates a structure in which an inlet (110) of one valve unit (10a) according to the second embodiment is connected to an outlet (120b) of another valve unit (10b). Fig. 11b illustrates that when Fig. 11a is continuously connected, a unit module portion (20) is provided. Fig. 11c illustrates a fluid check valve (20) equipped with the unit module portion (20) of Fig. 11b.

[0138]

[0139]

[0140] Below, a fifth embodiment of a fluid backflow prevention valve according to the present invention is described.

[0141] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0142] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0143] The fluid backflow prevention valve according to the fifth embodiment is an embodiment in which, in the fluid backflow prevention valve according to the fourth embodiment, an auxiliary island (141) having a circular shape with a smaller diameter than the bypass island (140) is further provided in the wide flow path section (170).

[0144] Fig. 12 illustrates a fifth embodiment of the present invention. Fig. 12a illustrates a structure in which an inlet (110a) of one valve unit (10a) according to the third embodiment is connected to an outlet (120b) of another valve unit (10b). Fig. 12b illustrates that when Fig. 12a is continuously connected, a unit module portion (20) is provided. Fig. 12c illustrates a fluid check valve (20) equipped with the unit module portion (20) of Fig. 12b.

[0145]

[0146] In the fourth and fifth embodiments, the three-dimensional shape may be any one of a cylinder, an ellipsoid, or a polyhedron.

[0147]

[0148]

[0149] Below, a sixth embodiment of a fluid backflow prevention valve according to the present invention is described.

[0150] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0151] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0152] A fluid check valve according to a sixth embodiment is a fluid check valve in which an upper unit module part (20a) and a lower unit module part (20b) in which identical valve units (10) are repeatedly arranged in a horizontal direction are vertically coupled to each other, and a flow path is provided inside a three-dimensional shape, wherein the valve unit (10) comprises: a main flow path (130) in which an inlet (110) and an outlet (120) are connected; a circular bypass island (140) formed spaced apart from the main flow path (130); a branch flow path (150) which branches off at a starting point (151) provided at a rear side of the main flow path (130), bypasses the bypass island (140), and is connected in the reverse direction of the fluid movement direction of the main flow path (130) at an end point (152) provided at a front side of the main flow path (130); And at the above point (151), a wide flow path section (170) wider than the flow cross-sectional area of ​​the main flow path and the bypass flow path is provided, and each valve unit (10) is arranged in a horizontal direction repeatedly so that the outlet (120) of one valve unit communicates with the inlet (110) of the other valve unit, and when the upper and lower parts are connected, the main flow path (130) of the upper unit module part (20a) is arranged on the lower side, and the main flow path (130) of the lower unit module part (20b) is arranged on the upper side, so that the respective main flow paths (130) are connected so as to overlap each other, and the respective bypass islands (140) of the upper unit module part (20a) and the lower unit module part (20b) are arranged in an up-and-down staggered manner.

[0153]

[0154] Fig. 13a illustrates a sixth embodiment of the present invention. Fig. 13a illustrates an upper unit module (20a) with a structure connected to the second embodiment. Fig. 13b illustrates a lower unit module (20b) with a structure in which the upper unit module (20a) is inverted downward. Fig. 13c illustrates a structure in which the upper unit module (20a) and the lower unit module (20b) are vertically connected.

[0155] Fig. 14a shows that the upper unit module (20a) of Fig. 13a is implemented in a three-dimensional shape. Figs. 14b and 14c show that the upper and lower combined structure of Fig. 13c is implemented in a three-dimensional shape.

[0156] Fig. 15 is a cross-sectional view of the sixth embodiment, showing the upper unit module section (20a), the lower unit module section (20b), the bypass island (140), and the wide passage section (170).

[0157] Figure 16 is a fluid flow diagram of the sixth embodiment, where Figure 16a shows a forward flow and Figure 16b shows a reverse flow. As shown in Figure 16b, when the fluid flows in reverse, it can be seen that large and small turbulent eddies are generated in various places, hindering the reverse flow.

[0158]

[0159] Below, a seventh embodiment of a fluid backflow prevention valve according to the present invention is described.

[0160] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0161] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0162] The fluid backflow prevention valve according to the seventh embodiment is an embodiment in which, in the fluid backflow prevention valve according to the sixth embodiment, an auxiliary island (141) having a smaller diameter than the circular bypass island (140) is further provided in the wide flow path section (170).

[0163]

[0164] Fig. 17 illustrates a seventh embodiment of the present invention. Fig. 17a illustrates that the upper unit module (20a) connected to the valve unit according to the third embodiment is implemented in a three-dimensional shape. Figs. 17b and 17c illustrate that the upper unit module (20a) and the lower unit module (20b) according to the third embodiment are implemented in a three-dimensional shape in a structure in which they are vertically connected.

[0165] Fig. 18 is a cross-sectional view of the seventh embodiment, showing the upper unit module section (20a), the lower unit module section (20b), the bypass island (140), the auxiliary island (141), and the wide passage section (170).

[0166] Figure 19 is a fluid flow diagram of the seventh embodiment, where Figure 19a shows a forward flow and Figure 19b shows a reverse flow. As shown in Figure 19b, when the fluid flows in reverse, it can be seen that large and small turbulent eddies are generated in various places, hindering the reverse flow.

[0167]

[0168] In the fourth and fifth embodiments, the three-dimensional shape may be any one of a cylinder, an ellipsoid, or a polyhedron.

[0169]

[0170]

[0171] Meanwhile, the fluid backflow prevention valve according to the present invention may be implemented in multiple units arranged left and right, or vertically. In this case, the valve may be implemented in a single three-dimensional shape, or multiple independent three-dimensional shapes may be arranged left and right, vertically, or vertically.

[0172] Fig. 20 shows an embodiment in which the unit module parts (20) according to the present invention are arranged in an overlapping manner. Fig. 20a shows a fluid backflow prevention valve (20) according to the sixth embodiment. Fig. 20b shows a structure in which the fluid backflow prevention valves (20) of Fig. 20a are independently provided but arranged left and right. Fig. 20c shows a structure in which two fluid backflow prevention valves (20) are arranged vertically in one three-dimensional shape.

[0173]

[0174]

[0175] Below, an eighth embodiment of a fluid backflow prevention valve according to the present invention is described.

[0176] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0177] [Correction pursuant to Rule 91 04.08.2025][Deleted]

[0178] The fluid check valve according to the eighth embodiment can be implemented as a fluid check valve in which a plurality of internal spaces radially partitioned within a cylindrical shape are each provided with a flow path. Specifically, in each flow path, an upper unit module part (20a) and a lower unit module part (20b) in which identical valve units (10) are repeatedly arranged in a horizontal direction are vertically coupled, and the valve unit (10) includes a main flow path (130) in which an inlet (110) and an outlet (120) are connected; a circular bypass island (140) formed spaced apart from the main flow path (130); a branch flow path (150) branched from a starting point (151) provided at a rear side of the main flow path (130), bypassing the bypass island (140), and then connected in the reverse direction of the fluid movement direction of the main flow path (130) at an end point (152) provided at a front side of the main flow path (130); And at the above point (151), a wide passage section (170) wider than the passage cross-section of the main passage and the bypass passage is provided, and each valve unit (10) is arranged in a horizontal direction repeatedly so that the outlet (120) of one valve unit communicates with the inlet (110) of the other valve unit, and when the upper and lower sections are combined, the main passage (130) of the upper unit module section (20a) is arranged on the lower side, and the main passage (130) of the lower unit module section (20b) is arranged on the upper side, so that the respective main passages (130) overlap each other, but the respective bypass islands (140) of the upper unit module section (20a) and the lower unit module section (20b) can be arranged in an up-and-down staggered manner.

[0179]

[0180] Fig. 21 is an embodiment of a fluid check valve in which a plurality of internal spaces radially partitioned within a cylindrical shape are each provided with a flow path. Fig. 21a is an eighth embodiment, in which three radially partitioned internal spaces are each provided with an independent flow path.

[0181] Figures 22a to 22c are partial cutaway views of the eighth embodiment, illustrating the internal flow path. Figure 22d is a partial cutaway view of the ninth embodiment, illustrating the internal flow path.

[0182] Fig. 23 is a fluid flow diagram of the eighth embodiment, where Fig. 23a shows a forward flow and Fig. 23b shows a reverse flow.

[0183]

[0184] Hereinafter, a ninth embodiment of a fluid backflow prevention valve according to the present invention is described.

[0185] A schematic diagram of the 9th embodiment is as follows.

[0186] The fluid backflow prevention valve according to the 9th embodiment is an embodiment in which, in the fluid backflow prevention valve according to the 8th embodiment, an auxiliary island (141) having a smaller diameter than the circular bypass island (140) is further provided in the wide flow path section (170).

[0187]

[0188] Fig. 21b is a ninth embodiment, in which six radially divided internal spaces each have an independent flow path.

[0189]

[0190]

[0191] Meanwhile, the fluid check valve according to the first to ninth embodiments of the present invention can be applied to a liquid drug injection system. Liquid drugs include various forms of liquid substances, such as therapeutic drugs and intravenous fluids.

[0192] The present invention is a liquid drug injection system equipped with a fluid check valve characterized by preventing backflow of a liquid drug. Specifically, the liquid drug injection system includes a connecting portion (2) communicating with a liquid drug storage portion (1); an injection chamber portion (3) into which liquid drug moved from the liquid drug storage portion (1) is introduced through the connecting portion (2); a connecting hose (4) through which liquid drug contained in the injection chamber portion (3) is discharged; and a needle portion (5) for injecting the drug discharged through the connecting hose (4) into a patient's body, wherein a fluid check valve (6) according to any one of claims 1, 3, 6, 9, or 12 may be provided on one side of the connecting hose (4).

[0193] In the present invention, a flow control unit (7) may be further provided on one side of the connecting hose (4) to control the flow rate of the liquid substance injected.

[0194] Figure 24 is a schematic diagram of a liquid drug injection system equipped with a fluid backflow prevention valve (6) according to the present invention.

[0195]

[0196] The embodiments described in this specification and the attached drawings are merely illustrative of some of the technical concepts encompassed by the present invention. Therefore, the embodiments disclosed in this specification are intended to illustrate, rather than limit, the technical concepts of the present invention. Therefore, it is clear that the scope of the technical concepts of the present invention is not limited by these embodiments. All modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical concepts contained in the specification and drawings of the present invention should be construed as being included within the scope of the rights of the present invention.

Claims

1. A fluid check valve having a flow path inside a three-dimensional shape, A main channel having an inlet and an outlet connected thereto; a bypass island formed separately from the main channel; and a branch channel branched at a point provided on one rear side of the main channel path, and after bypassing the bypass island, connected in the opposite direction of the fluid movement direction of the main channel at an end point provided on the other front side of the main channel path. A single unit-equipped fluid check valve characterized in that it further comprises a Euro round expansion part (160) that is provided to have a radius (R) set outside the Euro at the above point in time.

2. In claim 1, The above bypass island is It is provided in a round shape to correspond to the above branch flow, A fluid check valve having a single unit characterized in that it is provided with a tapered shape in the direction of the above point.

3. A fluid backflow prevention valve having a flow path inside a three-dimensional shape, A main channel having an inlet and an outlet connected thereto; a bypass island formed separately from the main channel; and a branch channel branched at a point provided on one rear side of the main channel path, and after bypassing the bypass island, connected in the opposite direction of the fluid movement direction of the main channel at an end point provided on the other front side of the main channel path. A fluid check valve having a single unit characterized in that, at the above point, a wide-width flow path section wider than the flow cross-sectional areas of the main flow path and the bypass flow path is further provided.

4. In claim 3, The above bypass island is A fluid check valve having a single unit characterized by being provided in a circular shape corresponding to the above branch flow path.

5. In claim 4, In the above wide euro section, A fluid check valve having a single unit, characterized in that it further comprises an auxiliary island having a circular shape with a smaller diameter than the above-mentioned bypass island.

6. A fluid check valve having a flow path made of a unit module section in which a plurality of identical valve units are arranged in a horizontal direction within a three-dimensional shape, The above valve unit A main channel having an inlet and an outlet connected thereto; a circular bypass island formed apart from the main channel; a branch channel branched at a point provided on one rear side of the main channel path, and after bypassing the bypass island, connected in the opposite direction of the fluid movement direction of the main channel at a terminal point provided on the other front side of the main channel path; and at the point provided, a wide channel section wider than the cross-sectional areas of the main channel and the bypass channel is provided. A fluid check valve having modular units, wherein each valve unit is arranged in a transversely repeated manner so that the outlet of one valve unit communicates with the inlet of another valve unit.

7. In claim 6, In the above wide euro section, A fluid check valve equipped with a module unit, characterized in that an auxiliary island having a circular shape with a smaller diameter than the above circular bypass island is further provided.

8. In claim 7, A fluid check valve having a module unit, wherein the three-dimensional shape is any one of a cylinder, an ellipsoid, and a polyhedron.

9. A fluid backflow prevention valve in which the upper unit module and the lower unit module are vertically connected with identical valve units arranged in a horizontal direction, and a flow path is provided inside the three-dimensional shape. The above valve unit A main channel having an inlet and an outlet connected thereto; a circular bypass island formed apart from the main channel; a branch channel branched at a point provided on one rear side of the main channel path, and after bypassing the bypass island, connected in the opposite direction of the fluid movement direction of the main channel at a terminal point provided on the other front side of the main channel path; and at the point provided, a wide channel section wider than the cross-sectional areas of the main channel and the bypass channel is provided. Each valve unit is arranged in a transversely repeated manner so that the outlet of one valve unit communicates with the inlet of the other valve unit, A fluid check valve equipped with a module unit, characterized in that, when the upper and lower parts are connected, the main flow path of the upper unit module part is arranged on the lower side, and the main flow path of the lower unit module part is arranged on the upper side, so that the respective main flow paths overlap each other, and the respective bypass islands of the upper unit module part and the lower unit module part are arranged in an up-and-down staggered manner.

10. In claim 9, In the above wide euro section, A fluid check valve equipped with a module unit, characterized in that an auxiliary island having a circular shape with a smaller diameter than the above circular bypass island is further provided.

11. In claim 10, A fluid check valve having a module unit, wherein the three-dimensional shape is any one of a cylinder, an ellipsoid, and a polyhedron.

12. A fluid check valve having a plurality of internal spaces radially divided within a cylindrical shape, each having a flow path. In each euro, the upper unit module and the lower unit module are connected vertically, with identical valve units arranged in a horizontal direction. The above valve unit A main channel having an inlet and an outlet connected thereto; a circular bypass island formed apart from the main channel; a branch channel branched at a point provided on one rear side of the main channel path, and after bypassing the bypass island, connected in the opposite direction of the fluid movement direction of the main channel at a terminal point provided on the other front side of the main channel path; and at the point provided, a wide channel section wider than the cross-sectional areas of the main channel and the bypass channel is provided. Each valve unit is arranged in a transversely repeated manner so that the outlet of one valve unit communicates with the inlet of the other valve unit, A fluid check valve equipped with a cylindrical module unit, characterized in that, when the upper and lower modules are connected, the main channel of the upper unit module part is arranged on the lower side, and the main channel of the lower unit module part is arranged on the upper side, so that the respective main channels overlap each other, and the respective bypass islands of the upper unit module part and the lower unit module part are arranged in an up-and-down staggered manner.

13. In claim 12, In the above wide euro section, A fluid check valve equipped with a cylindrical module unit, characterized in that an auxiliary island having a circular shape with a smaller diameter than the above circular bypass island is further provided.

14. A connecting member communicating with a liquid drug storage unit; An injection chamber into which a liquid drug moved from a liquid drug storage unit is introduced through the above-mentioned connecting portion; A connecting hose through which the liquid drug contained in the above injection chamber is discharged; and A liquid drug injection system including a needle part that injects the drug discharged through the above connecting hose into the patient's body, On one side of the above connecting hose, A liquid drug injection system having a fluid check valve, characterized in that the fluid check valve according to any one of claims 1, 3, 6, 9 or 12 is provided to prevent backflow of the liquid drug.

15. In claim 14, A liquid drug injection system equipped with a fluid backflow prevention valve, characterized in that a flow control unit for controlling the flow rate of a liquid substance injected is further provided on one side of the above connecting hose.

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