One-way valve for blood purification

Abstract

The utility model provides a one-way valve for blood purification, which comprises a three-way structure base provided with a blood inlet, a blood outlet and an infusion port, the infusion port is connected with an infusion joint communicated with the inside of the base, and a valve core only allowing liquid medicine to flow from the infusion joint to the base is arranged in the infusion joint; the valve element is an elastic body and comprises an arc-shaped deformation part with the concave face facing the infusion connector inlet and a positioning column. A first limiting part which is connected with the positioning column and is used for limiting the axial downward movement and radial movement of the positioning column, and a second limiting part which is in interference fit with the upper end of the arc-shaped deformation part and is used for limiting the axial upward movement of the arc-shaped deformation part are arranged in the infusion connector. The valve element is limited through the first limiting part and the second limiting part, it is guaranteed that the valve element can be located at the fixed position, the second limiting part is in interference fit with the upper end of the arc-shaped deformation part, the valve element has the negative pressure resisting capacity, and blood is prevented from being reversely dispersed to an infusion pipeline.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a one-way valve for blood purification. Background Technology

[0002] Blood purification refers to a treatment method that uses disposable extracorporeal blood purification tubing to draw blood out of the body, remove endogenous and / or exogenous toxins from the patient's blood using a blood purifier or dialyzer, and then return the blood to the body through the same tubing. Blood purification tubing typically has a one-way valve. During use, when there is no external pressure, the one-way valve is closed to keep the tubing sealed, preventing blood from leaking out. When medication is administered externally, the one-way valve opens, allowing the medication to enter the extracorporeal blood circulation and flow back into the body. This process does not interfere with the blood purification treatment itself.

[0003] Most existing medical check valves use silicone diaphragms as their elastic element. The inlet end is under positive pressure, and the inlet pressure must be greater than the outlet pressure for the silicone diaphragm to open. For example, the check valves disclosed in CN 218761628U and CN219208719U have rigid plastic parts at both ends, and the one-way device controlling the liquid flow is a silicone pad. With a positive thrust, the silicone pad opens, allowing the medication to flow; without a positive thrust, the silicone pad returns to its original position, and the medication stops flowing.

[0004] Blood is drawn out of the body using a peristaltic pump. During this process, the tubing before the pump is under negative pressure, which is also the negative pressure generated at the outlet of the check valve. Conversely, the pressure after the pump is positive, which is also the positive pressure generated at the outlet of the check valve. However, the aforementioned patented check valve only functions when the inlet pressure is positive and greater than the outlet pressure. When the outlet pressure is negative, the silicone pad is pulled open, allowing medication to passively flow in, posing a treatment risk. Therefore, it is necessary to provide a check valve that can be used when the outlet pressure is negative. Utility Model Content

[0005] The present invention aims to solve the technical problems existing in the prior art. The purpose of the present invention is to provide a one-way valve for blood purification.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a one-way valve for blood purification, comprising a base for blood flow connected to a blood purification circulation pipeline, the base being a three-way structure with a blood inlet, a blood outlet, and an infusion port, an infusion connector connected to the infusion port and communicating with the interior of the base, the infusion connector having a valve core that only allows the medication to flow from the infusion connector to the base; the valve core being an elastic body made of elastic material, the valve core including an arc-shaped deformable part with its concave surface facing the inlet of the infusion connector, and a positioning post fixed to the arc-shaped deformable part and extending towards the inlet of the infusion connector; the infusion connector having a first limiting part connected to the positioning post for limiting the axial downward movement and radial movement of the positioning post, and a second limiting part that is interference-fitted with the upper end of the arc-shaped deformable part for limiting the axial upward movement of the arc-shaped deformable part, when the concave surface of the arc-shaped deformable part is compressed and undergoes elastic deformation, the inlet of the infusion connector can communicate with the interior of the base through the infusion port.

[0007] In the above technical solution, when the medication enters through the infusion connector inlet, it pushes the concave surface of the arc-shaped deformation part of the valve core downward. The arc-shaped deformation part will deform and bend downward due to its own elasticity, causing the arc-shaped deformation part to disengage from the second limiting part. The medication enters the blood being transported inside the base through the infusion port. The valve core is limited by the first and second limiting parts to ensure that the valve core can be in a fixed position. Furthermore, the second limiting part is interference-fitted with the upper end of the arc-shaped deformation part, giving the valve core the ability to resist negative pressure and preventing blood from diffusing back into the infusion line.

[0008] In a preferred embodiment of this utility model, the first limiting part is a partition plate provided in the infusion connector. The partition plate has a mounting hole and a first diversion hole. The inlet of the infusion connector can communicate with the infusion port through the first diversion hole. The positioning post passes through the mounting hole and has a limiting ring located above the partition plate and abutting against the upper surface of the partition plate. The second limiting part is a downward step surface provided in the infusion connector. The upper end of the arc-shaped deformation part can abut against the lower step surface and be interference-fitted.

[0009] In the above technical solution, the mounting hole is used to limit the radial movement of the valve core, the partition is used to limit the axial downward movement of the valve core, and the lower step surface is used to limit the axial upward movement of the valve core, ensuring that the valve core can be in a fixed position.

[0010] In a preferred embodiment of this utility model, the lower step surface is flush with the lower surface of the partition and the lower step surface is arranged around the outside of the partition.

[0011] In a preferred embodiment of this utility model, the positioning post is located in the middle of the arc-shaped deformation part, the mounting hole is located in the middle of the partition and is coaxial with the infusion connector, and a plurality of first diversion holes are provided on the outer periphery of the mounting hole.

[0012] The above technical solution, with coaxial alignment and multiple first diversion holes on the outer periphery of the mounting hole, makes the concave surface of the arc-shaped deformation part more uniformly stressed and extends its service life.

[0013] In a preferred embodiment of this utility model, the arc-shaped deformable part is integrally formed with the positioning post; and / or the valve core is made of medical rubber or medical polyurethane elastic material with a Shore hardness of 30A-60A.

[0014] The above technical solution ensures that the valve core has sufficient hardness and strength, so that when blood flows through the base and negative pressure is generated, the arc-shaped deformation part will not detach from the lower step surface, thus ensuring the sealing performance under negative pressure.

[0015] In another preferred embodiment of this utility model, the angle between the tangent of the arc-shaped deformed part and the horizontal line is 20°-30°.

[0016] The above technical solution incorporates an arc-shaped deformation section at an appropriate angle to ensure structural strength.

[0017] In another preferred embodiment of this utility model, the thickness of the arc-shaped deformed part is 0.5mm-0.8mm.

[0018] The above technical solution incorporates an arc-shaped deformation section of appropriate thickness to ensure structural strength.

[0019] In another preferred embodiment of the present invention, a support column that protrudes upward and abuts against the middle of the bottom of the arc-shaped deformation part is fixedly connected to the infusion port of the base, and the infusion port has a second diversion hole that communicates with the interior of the base.

[0020] In the above technical solution, the support column is used to press against the arc-shaped deformation part to ensure that the upper end of the arc-shaped deformation part and the second limiting part are always in an interference fit when no infusion is being administered, thereby improving the valve core's ability to resist negative pressure.

[0021] In another preferred embodiment of the present invention, a support plate capable of sealing the infusion port of the base is fixedly connected to the base, a support column is fixedly mounted on the top of the support plate, and a second diversion hole is provided on the support plate.

[0022] In another preferred embodiment of the present invention, a plurality of circumferentially spaced limiting posts are fixedly connected to the infusion port of the base. There is a gap between the upper end of the limiting post and the lower surface of the arc-shaped deformable part. The limiting posts are used to limit the amount of deformation of the arc-shaped deformable part.

[0023] In the above technical solution, the limiting post is used to limit the deformation of the arc-shaped deformable part. When the infusion pressure is too high, it can prevent the arc-shaped deformable part from folding downward, thereby improving the reliability of the one-way valve.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the external structure of a one-way valve for blood purification according to an embodiment.

[0027] Figure 2 This is a front sectional view of a one-way valve for blood purification according to an embodiment.

[0028] Figure 3 yes Figure 2 A side cross-sectional schematic diagram of a one-way valve for blood purification.

[0029] Figure 4 This is a three-dimensional structural diagram of the infusion connector in the embodiment.

[0030] Figure 5 This is a three-dimensional structural diagram of the base in the embodiment.

[0031] Figure 6 This is a cross-sectional schematic diagram of the valve core in the embodiment.

[0032] The reference numerals in the accompanying drawings include: base 10, blood inlet 11, blood outlet 12, infusion port 13, support column 14, second diversion hole 15, support plate 16, limiting column 17, infusion connector 20, first limiting part (partition) 21, mounting hole 211, first diversion hole 212, second limiting part (lower step surface) 22, locking thread 23, valve core 30, arc-shaped deformation part 31, positioning column 32, and limiting ring 321. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0036] This utility model provides a one-way valve for blood purification, such as Figures 1-3 As shown, in a preferred embodiment, the one-way valve includes a base 10 connected to the blood purification circulation pipeline for blood flow. The base 10 has a three-way structure with a blood inlet 11, a blood outlet 12, and an infusion port 13. For example, the blood inlet 11 is located on the left, the blood outlet 12 is located on the right, and the infusion port 13 is located at the top center. A vertical infusion connector 20 communicating with the interior of the base 10 is connected to the infusion port 13. The lower end of the infusion connector 20 is welded to the base 10 in a complete circle to ensure a firm and airtight connection. The infusion connector 20 is provided with a valve core 30 that only allows the medication to flow from the infusion connector 20 to the base 10. This valve core 30 is a one-way valve core.

[0037] The valve core 30 is an elastic body made of elastic material, capable of elastic deformation. The valve core 30 includes an arc-shaped deformable portion 31 with its concave surface facing the inlet of the infusion connector 20, and a positioning post 32 fixedly connected to the arc-shaped deformable portion 31 and extending towards the inlet of the infusion connector 20. The positioning post 32 is located in the middle of the arc-shaped deformable portion 31 and is coaxial with the infusion connector 20. The valve core 30 has an umbrella-shaped structure, with the arc-shaped deformable portion 31 acting as the umbrella surface and the positioning post 32 acting as the umbrella handle. The infusion connector 20 has a first limiting portion 21 connected to the positioning post 32 to restrict the axial downward movement and radial movement of the positioning post 32, and a second limiting portion 22, which is interference-fitted with the upper end of the arc-shaped deformable portion 31 to restrict the axial upward movement of the arc-shaped deformable portion 31. When the concave surface of the arc-shaped deformable portion 31 is compressed and undergoes elastic deformation, the inlet of the infusion connector 20 can communicate with the interior of the base 10 through the infusion port 13.

[0038] The blood inlet 11 and blood outlet 12 of the base 10 of this utility model are connected to the blood purification circulation pipeline, and the blood flow direction is from the blood inlet 11 to the blood outlet 12. When no infusion is being administered, the valve core 30 cannot move axially or radially under the restriction of the first limiting part 21 and the second limiting part 22, ensuring that the valve core 30 can be in a fixed position. The outlet end of the infusion connector 20 is completely sealed by the valve core 30, and the inlet of the infusion connector 20 is not connected to the inside of the base 10, that is, the one-way valve is in the closed state. When infusion treatment is required during hemodialysis, the medication enters from the inlet of the infusion connector 20. When the medication pressure on the inlet side of the infusion connector 20 reaches a certain value, the strength of the arc-shaped deformation part 31 is insufficient to resist it and it bends downward, creating a gap between the inlet of the infusion connector 20 and the infusion port 13, thus creating a connection. The one-way valve is in the open state, and the medication enters the inside of the base 10 through the infusion port 13 and flows back to the human body with the blood.

[0039] When the one-way valve is installed before the peristaltic pump in the blood purification circulation line, a negative pressure (e.g., -30 kPa to 0 kPa) is generated inside the base 10. At this time, the lower end of the valve core 30 bears the negative pressure. Based on the fixing method and structure of the valve core 30, the valve core 30 itself has the ability to resist negative pressure, preventing blood from diffusing back into the infusion line. When the one-way valve is installed after the peristaltic pump in the blood purification circulation line, a positive pressure (e.g., 0 kPa to +500 kPa) is generated inside the base 10. At this time, the lower end of the valve core 30 bears the positive pressure. Based on the fixing method and structure of the valve core 30, the valve core 30's closing ability becomes stronger with increasing positive pressure, preventing leakage.

[0040] like Figure 2 As shown, in this utility model, the infusion connector 20 can be a Luer female connector with a locking thread 23 on its outer wall, which facilitates quick connection with the Luer male connector of the infusion pipeline. The inlet inner wall of the infusion connector 20 is a tapered hole with the upper end larger than the lower end, ensuring the airtightness of the connection between the Luer male connector and the infusion connector 20.

[0041] like Figures 2-4 As shown, in this utility model, the first limiting part 21 is a partition plate provided in the infusion connector 20. The partition plate 21 has a mounting hole 211 and a first diversion hole 212. Preferably, the mounting hole 211 is located in the middle of the partition plate 21 and is coaxial with the infusion connector 20. A plurality of first diversion holes 212 are evenly distributed circumferentially around the outer periphery of the mounting hole 211. The inlet of the infusion connector 20 can communicate with the infusion port 13 through the first diversion holes 212. Figure 6As shown, the positioning post 32 passes through the mounting hole 211 from bottom to top, and the mounting hole 211 restricts the radial movement of the positioning post 32. The positioning post 32 has a limiting ring 321 located above the partition 21 and abutting against the upper surface of the partition 21. The limiting ring 321 is upside down on the partition 21 to restrict the axial downward movement of the positioning post 32. The second limiting part 22 is a downward step surface provided in the infusion connector 20. Preferably, the lower step surface 22 is flush with the lower surface of the partition 21 and the lower step surface 22 is arranged around the partition 21. The upper end of the arc-shaped deformation part 31 (i.e., the upper surface of its outer edge) can abut against the lower step surface 22 and be interference-fitted.

[0042] The valve core 30 of this invention is fixedly installed in the infusion connector 20 via a limiting ring 321 that is inverted and fastened to the partition plate 21, and an arc-shaped deformable part 31 that abuts against the lower step surface 22. The upper end of the arc-shaped deformable part 31 is press-fitted with the lower step surface 22 to ensure the sealing performance of the one-way valve. During infusion, the medicine entering the infusion connector 20 passes through the first diversion hole 212 and pushes the concave surface of the arc-shaped deformable part 31 downward, causing it to deform and bend downward, thus opening the one-way valve.

[0043] like Figure 6 As shown, in another preferred embodiment, to improve the strength of the valve core 30, the arc-shaped deformable portion 31 and the positioning post 32 are integrally formed. Preferably, the valve core 30 is made of medical rubber or medical polyurethane elastic material with a Shore hardness of 30A-60A, which has sufficient hardness and strength to ensure that the upper end of the arc-shaped deformable portion 31 will not detach from the lower step surface 22 when negative pressure is generated in the base 10, thus ensuring the sealing performance under negative pressure. More preferably, the angle θ between the tangent of the arc-shaped deformable portion 31 and the horizontal line is 20°-30°, and the thickness t of the arc-shaped deformable portion 31 is 0.5mm-0.8mm, for example, 0.6mm, with a tolerance of ±0.05mm. The thickness is sufficient to ensure strength, and the contact length with the lower step surface 22 is sufficient, resulting in good line sealing performance. In addition, the outer edge of the arc-shaped deformable portion 31 should be able to completely cover the inlet of the infusion connector 20 and extend outward for a certain distance.

[0044] like Figure 2 , Figure 3 and Figure 5 As shown, in another preferred embodiment, a support column 14 that protrudes upward and abuts against the middle of the bottom of the arc-shaped deformed part 31 is fixedly connected to the infusion port 13 of the base 10. The infusion port 13 has a second diversion hole 15 that communicates with the interior of the base 10. Specifically, a support plate 16 that can close the infusion port 13 can be provided in the infusion port 13 of the base 10. The support column 14 is fixed in the middle of the top of the support plate 16, and the second diversion hole 15 is provided on the support plate 16. For example, a second diversion hole 15 is provided on each side of the support column 14, and the two second diversion holes 15 enclose a circular hole.

[0045] When the infusion connector 20 is welded to the base 10, the support column 14 presses against the bottom of the arc-shaped deformation part 31 to ensure an interference fit between the upper end of the arc-shaped deformation part 31 and the lower step surface 22, ensuring that the valve core 30 is always in a fixed position. During infusion, the arc-shaped deformation part 31 of the valve core 30 bends downward, the one-way valve is in the open state, the first diversion hole 212 and the second diversion hole 15 are connected, and the medicine enters the interior of the base 10 through the infusion connector 20 inlet, the first diversion hole 212, and the second diversion hole 15.

[0046] More preferably, the infusion port 13 of the base 10 is also fixedly connected with a plurality of limiting posts 17 circumferentially spaced outside the second diversion hole 15. The limiting posts 17 are also fixedly connected to the support plate 16. There is a gap between the upper end of the limiting post 17 and the lower surface of the arc-shaped deformation part 31 (the width of the gap is greater than the interference between the upper end of the arc-shaped deformation part 31 and the lower step surface 22, ensuring that the upper end of the arc-shaped deformation part 31 can be disengaged from the lower step surface 22 and conduct during infusion). The limiting posts 17 are used to limit the amount of deformation of the arc-shaped deformation part 31 bending downward. Thus, when the infusion pressure is too high, the arc-shaped deformation part 31 can be prevented from folding downward (similar to the umbrella surface folding upward when the wind is strong) and not being able to recover, thereby improving the reliability of the valve core 30.

[0047] In the description of this specification, the references to terms such as "preferred embodiment," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A one-way valve for use in blood purification, characterized by, The base for blood flow connected with blood purification circulation pipeline, the base is three-way structure with blood inlet, blood outlet and infusion port, the infusion port is connected with infusion connector communicating with the inside of the base, the infusion connector is provided with valve core allowing only liquid medicine to flow from the infusion connector to the base; The valve core is an elastic body made of elastic material, the valve core includes an arc-shaped deformation part with concave surface facing the inlet of the infusion connector, and a positioning column extending to the inlet of the infusion connector and fixedly connected with the arc-shaped deformation part; The infusion connector is provided with a first limiting part connected with the positioning column for limiting the axial downward movement and radial jumping of the positioning column, and a second limiting part in interference fit with the upper end of the arc-shaped deformation part for limiting the axial upward movement of the arc-shaped deformation part, when the concave surface of the arc-shaped deformation part is pressed to produce elastic deformation, the inlet of the infusion connector can communicate with the inside of the base through the infusion port.

2. The one-way valve for blood purification according to claim 1, wherein The first limiting part is a partition plate provided in the infusion connector, the partition plate has a mounting hole and a first shunt hole, the inlet of the infusion connector can communicate with the infusion port through the first shunt hole, the positioning column passes through the mounting hole and has a limiting ring above the partition plate and abutting against the upper surface of the partition plate; The second limiting part is a downward lower step surface provided in the infusion connector, the upper end of the arc-shaped deformation part can abut against and interference fit with the lower step surface.

3. The one-way valve for use in blood purification according to claim 2, wherein The lower step surface is flush with the lower surface of the partition plate, and the lower step surface is annularly arranged outside the partition plate.

4. The one-way valve for use in blood purification according to claim 2, wherein The positioning column is located in the middle of the arc-shaped deformation part, the mounting hole is coaxial with the infusion connector and arranged in the middle of the partition plate, and a plurality of first shunt holes are arranged on the outer periphery of the mounting hole.

5. The one-way valve for use in blood purification according to claim 1, wherein The arc-shaped deformation part is integrally formed with the positioning column. And / or the valve core is made of medical rubber or medical polyurethane elastic material with Shore hardness of 30A-60A.

6. The one-way valve for use in blood purification according to claim 1, wherein The included angle between the tangent of the arc-shaped deformation part and the horizontal line is 20°-30°.

7. The one-way valve for use in blood purification according to claim 1, wherein The thickness of the arc-shaped deformation part is 0.5mm-0.8mm.

8. The one-way valve for use in blood purification according to any one of claims 1 to 7, wherein The infusion port of the base is fixedly connected with an upwardly protruding support column capable of abutting against the middle of the bottom of the arc-shaped deformation part, and the infusion port has a second shunt hole communicating with the inside of the base.

9. The one-way valve for use in blood purification according to claim 8, wherein The infusion port of the base is fixedly connected with a support plate capable of closing the infusion port, the support column is fixedly arranged on the top of the support plate, and the second shunt hole is arranged on the support plate.

10. The one-way valve for use in blood purification according to any one of claims 1 to 7, wherein The infusion port of the base is fixedly connected with a plurality of limiting columns arranged at intervals in the circumferential direction, the upper end of the limiting column has a gap with the lower surface of the arc-shaped deformation part, and the limiting column is used for limiting the deformation amount of the arc-shaped deformation part.

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