Medical pressure-limiting valve for infusion lines

Abstract

The application provides a medical pressure-limiting valve for an infusion pipeline, comprising: a shell, an inlet for connecting an inlet pipeline, and an outlet for connecting an outlet pipeline; a diaphragm arranged in an inner cavity and separating the inner cavity into an inlet cavity and an outlet cavity, the inlet cavity being communicated with the inlet to form an inlet channel, and the outlet cavity being communicated with the outlet to form an outlet channel; the diaphragm being provided with at least one diaphragm hole for communicating the inlet cavity and the outlet cavity; a plug being arranged in the inner cavity and connected with the diaphragm; the pressure-limiting valve having a conducting state and a blocking state; in the blocking state, the pressure difference between the inlet channel and the outlet channel is greater than or equal to a set value, the plug blocks the outlet to make the inlet channel and the outlet channel not communicated; in the conducting state, the pressure difference between the inlet channel and the outlet channel is less than the set value, and the plug has a spacing with the outlet to make the inlet channel and the outlet channel communicated. The medical pressure-limiting valve for the infusion pipeline provided by the application has the advantages of simple structure, rapid response and reliable sealing.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and in particular to a medical pressure limiting valve for use in infusion lines. Background Technology

[0002] During medical infusion, especially in clinical scenarios such as fieldwork, mobile transport, changes in patient positioning, or improper operation of the infusion pump, the infusion tubing is susceptible to accidental compression or external pressure, leading to a sudden increase in pressure at the infusion end (i.e., the inlet tubing). This pressure fluctuation can trigger a sudden surge in flow rate, causing excessive medication to enter the patient's bloodstream in a short period. Mild symptoms may include venous distension and palpitations, while severe cases may result in abnormally high blood drug concentrations and serious complications. Traditional pressure-limiting valves often employ mechanical spring structures, which suffer from slow response times, low accuracy, and susceptibility to fluid properties. Especially in medical infusion applications, ensuring the stability and safety of the infusion pressure is crucial, and traditional pressure-limiting valves often fail to meet the requirements for high precision and reliability.

[0003] Furthermore, existing pressure-limiting valves are often structurally complex, costly to manufacture, and difficult to maintain. Especially in medical environments requiring frequent sterilization, the sealing performance and durability of the valve body face significant challenges. Therefore, there is an urgent need for a pressure-limiting valve that is simple in structure, responds quickly, and has high precision to meet the needs of modern infusion systems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of complex structure, high cost, and difficult maintenance of the aforementioned medical pressure-limiting valves. This invention provides a medical pressure-limiting valve for infusion lines, which has a simple structure, rapid response, and reliable sealing.

[0005] To address the aforementioned technical problems, embodiments of the present invention disclose a medical pressure-limiting valve for infusion lines, comprising:

[0006] The housing has a liquid inlet, an inner cavity, and a liquid outlet, wherein the liquid inlet is used to connect to a liquid inlet pipeline, and the liquid outlet is used to connect to a liquid outlet pipeline;

[0007] A diaphragm is disposed within the inner cavity, dividing the inner cavity into an inlet cavity and an outlet cavity. The inlet cavity communicates with the inlet to form an inlet channel, and the outlet cavity communicates with the outlet to form an outlet channel.

[0008] The diaphragm has at least one diaphragm hole for connecting the inlet chamber and the outlet chamber;

[0009] A plug is disposed in the inner cavity and connected to the diaphragm;

[0010] The medical pressure limiting valve used in the infusion line has an open state and a blocked state;

[0011] In the blocked state, the pressure difference between the inlet channel and the outlet channel is greater than or equal to a set value, and the plug blocks the outlet to prevent the inlet channel and the outlet channel from communicating.

[0012] In the conductive state, the pressure difference between the inlet channel and the outlet channel is less than the set value, and the plug and the outlet are spaced apart to allow the inlet channel and the outlet channel to communicate.

[0013] Using the above technical solution, the medical pressure-limiting valve for the infusion line is connected in series with the infusion line via an inlet and an outlet, forming a seamless fluid channel. After the infusion fluid enters the housing cavity through the inlet, it first fills the inlet chamber, then flows smoothly through specially designed diaphragm holes to the outlet chamber, and finally is infused into the patient through the outlet. During normal clinical infusion, when the pressure generated by the infusion pump or the gravity drip pressure is stably maintained below the set safety value (i.e., the pressure difference between the inlet and outlet channels is less than the set value), the medical pressure-limiting valve for the infusion line automatically remains open. At this time, the plug and the outlet are spaced apart, forming an unobstructed infusion channel, ensuring that the medication is delivered stably at the preset flow rate without affecting the implementation of the routine treatment procedure. When the pressure at the infusion end increases abnormally due to external pressure, pump malfunction, or other unforeseen circumstances (i.e., the pressure difference between the infusion channel and the outlet channel is greater than or equal to the set value), the pressure difference between the infusion chamber and the outlet chamber rapidly exceeds the set safety threshold. This pressure difference acts on the diaphragm surface and is immediately converted into a mechanical driving force, causing the elastic diaphragm to undergo precise and controllable deformation.

[0014] In other words, by directly driving the movement of the plug through the deformation of the diaphragm, a rapid response to pressure difference is achieved, enabling the medical pressure limiting valve used in infusion lines to have both open and closed states. This results in precise pressure control and zero-delay state switching, making it particularly suitable for scenarios with frequent pressure fluctuations and improving the safety and reliability of the system.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for infusion tubing, wherein the diaphragm and the plug are both made of elastic material.

[0016] By adopting the above technical solution, the elastic material enables the diaphragm and plug to have good deformation recovery ability, thereby ensuring the durability of the medical pressure relief valve used in infusion lines under long-term repeated operation. At the same time, the material's own elasticity is used to achieve sealing, simplifying the structure and reducing manufacturing costs.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for infusion lines, wherein the diaphragm and the plug are integrally formed.

[0018] By adopting the above technical solution, the one-piece molding eliminates the connecting parts between the diaphragm and the plug, thereby avoiding the risk of leakage caused by loose connection or gaps, enhancing the integrity and sealing reliability of the valve body, and simplifying the assembly process.

[0019] According to another specific embodiment of the present invention, a medical pressure-limiting valve for an infusion line is disclosed. The plug has a blocking section with a blocking surface. The housing includes a first wall and a second wall, which are spaced apart along a first direction. The inlet is located on the first wall, and the outlet is located on the second wall.

[0020] In the conductive state, the blocking surface is parallel to the second wall and has a first distance between them;

[0021] In the blocked state, the blocking surface adheres to the second wall to block the liquid outlet.

[0022] By employing the above technical solution, a blocking section with a specific blocking surface is set up and cooperates with the second wall. In the blocked state, the blocking surface fully adheres to the second wall to form a surface blockage, which greatly improves the blocking effect and effectively prevents the flow of liquid; in the open state, the parallel spacing ensures smooth flow and reduces pressure loss.

[0023] Specifically, driven by diaphragm deformation, the plug moves precisely along the first direction, its blocking surface fully adhering to the second wall where the outlet is located, forming a physical sealing barrier. This action instantly severs the connection between the inlet and outlet channels, effectively preventing overpressured fluid from continuing to flow to the patient, fundamentally avoiding clinical risks such as venous injury and sudden increases in blood drug concentration that may be caused by instantaneous high-flow-rate infusion. When the abnormal pressure is relieved or restored to the normal infusion pressure range through system self-regulation, the pressure difference acting on both sides of the diaphragm decreases to below the set value. The diaphragm automatically rebounds due to the shape memory properties of its elastic material, synchronously resetting the plug and re-establishing a safe distance between the plug and the outlet. The infusion channel then becomes unobstructed, ensuring that the treatment process continues under a safe pressure environment, achieving intelligent switching between the protection state and the normal infusion state without manual intervention.

[0024] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, wherein the relationship between the first distance and the set value satisfies the following formula:

[0025]

[0026] in, Where E is the first distance, and E is the elastic modulus of the diaphragm material. Let be the Poisson's ratio of the diaphragm material, t be the thickness of the diaphragm, R be the equivalent radius of the diaphragm, n be the number of pores in the diaphragm, and r be the radius of the pores in the diaphragm. It is a dimensionless fit index. The set value is as described above.

[0027] Using the above technical solution, the physical parameters, geometric parameters, and working parameters (first distance) of the diaphragm are expressed using the above formula. Set pressure difference Quantitative correlation is performed to standardize and refine the design process of medical pressure-limiting valves used in infusion lines, thereby enabling them to be designed based on target settings. Directly calculate the first distance of the critical dimension Alternatively, the set values ​​can be verified in reverse based on the structural dimensions, which greatly facilitates product design and optimization and shortens the development cycle.

[0028] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for infusion lines. The value range is from 0.5 to 150.

[0029] The above technical solution is used to obtain a dimensionless fitting index. It provides a verified range of valid values, ensuring the accuracy and reliability of the above calculation formulas in practical applications, providing clear guidance for engineering design and parameter fitting, and avoiding performance deviations caused by improper parameter selection.

[0030] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, wherein the total area of ​​the diaphragm is greater than 40 times the total area of ​​the diaphragm orifices, the total area of ​​the diaphragm orifices is greater than 1.4 times the cross-sectional area of ​​the infusion line, and the total area of ​​the diaphragm orifices is less than 3 times the cross-sectional area of ​​the infusion line.

[0031] By adopting the above technical solution, the proportional relationship between the diaphragm area, the total area of ​​the diaphragm orifices, and the cross-sectional area of ​​the outlet pipe is limited. When the diaphragm area is large enough, it can sensitively sense pressure changes and generate sufficient deformation driving force. When the total area of ​​the diaphragm orifices is moderate, it ensures the flow requirements in the conducting state, avoids excessive flow resistance, and prevents the effective force-bearing area of ​​the diaphragm from being weakened due to the excessively large diaphragm orifice area, thus affecting the response sensitivity.

[0032] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, wherein the number of diaphragm holes is two, and the two diaphragm holes are symmetrically arranged with respect to the center of the diaphragm.

[0033] By adopting the above technical solution, symmetrically arranged diaphragm holes are used to balance the impact forces generated on the diaphragm when the fluid passes through it, thus avoiding uneven wear or abnormal deformation of the diaphragm due to uneven force, and improving the stability and service life of the diaphragm.

[0034] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, wherein the plug includes a first part and a second part symmetrically arranged relative to the diaphragm, the first part being located in the inlet channel and the second part being located in the outlet channel.

[0035] By adopting the above technical solution, the plug is designed as a first part and a second part that are symmetrical with respect to the diaphragm, thereby balancing the force of the fluid in the inlet and outlet chambers on the plug, making the movement of the plug more stable, reducing the risk of jamming, and the symmetrical structure is conducive to processing and manufacturing.

[0036] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, the first part comprising:

[0037] The first segment extends along the first direction, with one end located at the liquid inlet and spaced apart from the liquid inlet, and the other end connected to the diaphragm.

[0038] The second segment extends along a second direction and is parallel to and spaced apart from both the first wall and the membrane. The second direction intersects with the first direction.

[0039] The above technical solution adopts a segmented structure in the first part. The first segment ensures the distance from the liquid inlet to avoid improper interference. The second segment is parallel and spaced from the first wall, which plays a role in guiding and stabilizing the movement of the plug and preventing it from shaking in the inner cavity.

[0040] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, wherein the second part includes a third section and the blocking section: wherein,

[0041] The third segment extends along the first direction, one end of the third segment is located at the liquid outlet and is spaced apart from the liquid outlet, and the other end of the third segment is connected to the membrane;

[0042] The blocked segment has the blocked surface, which extends along the second direction. In the conductive state, the blocked surface is parallel to and spaced apart from both the second wall and the diaphragm. In the blocked state, the blocked surface is spaced apart from the diaphragm and adheres to the second wall. The second direction intersects with the first direction.

[0043] Using the above technical solution, the second part also adopts a segmented design and clarifies the orientation of the blockage surface. The third segment ensures the distance from the liquid outlet to avoid improper interference. The specific orientation and spacing of the blockage surface in the conducting and blocking states ensure the reliability of the flow channel switching and the effectiveness of the seal.

[0044] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, wherein the second direction is perpendicular to the first direction.

[0045] By adopting the above technical solution, the vertical relationship between the two directions is clarified, which makes the internal structure of the valve body more regular, the space utilization more efficient, and the processing and assembly easier.

[0046] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a medical pressure limiting valve for an infusion line, the housing comprising a left housing and a right housing, the left housing being sealed to the right housing to form the inner cavity, a diaphragm being disposed between the left housing and the right housing and connected to the outer edges of the left housing and the right housing, the first portion being located in the left housing and the second portion being located in the right housing.

[0047] The above technical solution adopts a split left and right shell design, which greatly facilitates the installation and maintenance of internal components such as diaphragms and plugs; the sealed connection ensures the sealing of the inner cavity; and each part is housed in the left and right shells respectively, with a clear structure and well-defined assembly relationship.

[0048] In summary, the medical pressure limiting valve for infusion lines provided by this invention has at least the following beneficial effects:

[0049] Structural integration: The integrated design of the diaphragm and plug simplifies the valve body structure and reduces the number of parts and assembly costs.

[0050] Excellent dynamic response: The plug is directly driven by diaphragm deformation, with no pressure response delay, making it suitable for high-frequency pressure fluctuation scenarios.

[0051] Parameters are quantifiable: Key parameters are linked by formulas, making the design process standardized and easy to adapt to different working conditions.

[0052] High sealing reliability: The combination of elastic material and optimized geometry achieves zero-leakage sealing even in a blocked state.

[0053] Ease of maintenance: The split housing and modular design facilitate the inspection, replacement and maintenance of internal components.

[0054] To make the above description of the present invention more apparent and understandable, preferred embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0055] Figure 1 A cross-sectional view of a medical pressure limiting valve for infusion tubing provided by the present invention is shown, wherein the pressure limiting valve is in the conducting state;

[0056] Figure 2 A cross-sectional view of a medical pressure-limiting valve for infusion lines provided by the present invention is shown, wherein the pressure-limiting valve is in a blocked state.

[0057] In the attached figures, the following labels are used:

[0058] 10 Shell; 101 Left shell; 102 Right shell; 103 First wall; 104 Second wall; 11 Liquid inlet; 12 Inner cavity; 121 Liquid inlet cavity; 122 Liquid outlet cavity; 13 Liquid outlet;

[0059] 20 membranes; 21 membrane pores;

[0060] 30. Plug; 31. First part; 311. First section; 312. Second section; 32. Second part; 321. Blocked section; 322. Blocked surface; 323. Third section;

[0061] 40 liquid inlet pipeline;

[0062] 50 liquid outlet pipeline. Detailed Implementation

[0063] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0064] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0065] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention 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 limiting the present invention.

[0066] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0067] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0068] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0069] refer to Figure 1 This application provides a medical pressure limiting valve for infusion lines, including a housing 10, a diaphragm 20, and a plug 30. The housing 10 has an inlet 11, an inner cavity 12, and an outlet 13. The inlet 11 connects to an inlet line 40, and the outlet 13 connects to an outlet line 50. The housing 10 adopts a split design, including a left housing 101 and a right housing 102, which are sealed together by a sealing ring (not shown). This split structure facilitates the installation and maintenance of internal components while ensuring the sealing performance of the inner cavity. The left housing 101 includes a first wall 103, and the right housing 102 includes a second wall 104. The first wall 103 and the second wall 104 are aligned along a first direction (i.e.,...). Figure 1 The inlet 11 is located on the first wall 103 and the outlet 13 is located on the second wall 104. (As shown in the X direction) The inlet 11 is located on the first wall 103 and the outlet 13 is located on the second wall 104.

[0070] For example, the diaphragm 20 is disposed within the inner cavity 12, dividing the inner cavity 12 into an inlet cavity 121 and an outlet cavity 122. The inlet cavity 121 communicates with the inlet port 11 to form an inlet channel, and the outlet cavity 122 communicates with the outlet port 13 to form an outlet channel. The outer edge of the diaphragm 20 has two diaphragm holes 21 symmetrically arranged with respect to the center of the diaphragm 20. The symmetrical arrangement of the diaphragm holes 21 balances the impact force generated on the diaphragm 20 when the fluid passes through it, preventing uneven wear or abnormal deformation of the diaphragm 20 due to uneven force, thus improving the stability and service life of the diaphragm 20. Specifically, the diaphragm 20 is disposed between the left shell 101 and the right shell 102, and is connected to the outer edges of both the left and right shells 101 and 102.

[0071] It should be noted that the number of membrane holes 21 is not limited in the embodiments of this application, and can also be one, three, four, five, etc.

[0072] The diaphragm 20 is made of an elastic material, and its total area is more than 40 times the total area of ​​the diaphragm orifice 21, ensuring a sensitive response to pressure changes. The total area of ​​the diaphragm orifice 21 is greater than 1.4 times the cross-sectional area of ​​the outlet pipe, but less than 3 times the cross-sectional area of ​​the outlet pipe. When the total area of ​​the diaphragm orifice 21 is moderate, it ensures the flow rate requirements in the conducting state, avoids excessive flow resistance, and prevents the effective force-bearing area of ​​the diaphragm 20 from being weakened due to the excessive area of ​​the diaphragm orifice 21, thus affecting the response sensitivity.

[0073] For example, the plug 30 is disposed within the inner cavity 12 and connected to the diaphragm 20. The plug 30 and the diaphragm 20 are made of elastic material and integrally formed. The plug 30 includes a symmetrically arranged first part 31 and a second part 32. By designing the plug 30 with the first part 31 and the second part 32 symmetrical with respect to the diaphragm 20, the forces exerted on the plug 30 by the fluid in the inlet cavity 121 and the outlet cavity 122 are balanced, making the movement of the plug 30 smoother and reducing the risk of jamming. At the same time, the symmetrical structure facilitates manufacturing. Specifically, the first part 31 is located in the inlet cavity 121, and the second part 32 is located in the outlet cavity 122.

[0074] For example, the first part 31 includes a first segment 311 and a second segment 312, the first segment 311 being along a first direction (i.e. Figure 1 The first segment 311 extends along the X direction (as shown), with one end located inside the inlet 11 and spaced apart from it, and the other end connected to the diaphragm 20. The second segment 312 extends along the second direction (i.e., along the X direction). Figure 1Extending in the Y direction (as shown), it is parallel to and spaced apart from the first wall 103 and the diaphragm 20. The first segment 311 ensures the distance from the inlet 11 and avoids improper interference; the second segment 312 is parallel to and spaced apart from the first wall 103, and plays a role in guiding and stabilizing the movement of the plug 30, preventing it from shaking in the inner cavity 12.

[0075] Among them, the first direction (i.e. Figure 1 The X direction shown) and the second direction (i.e. Figure 1 The Y-direction shown intersects with the first direction (i.e., the direction shown in the diagram). For ease of description, the embodiments of this application use the first direction (i.e., the direction shown in the diagram) as the intersection. Figure 1 The X direction shown) and the second direction (i.e. Figure 1 Let's take the Y-direction (as shown) as perpendicular as an example to illustrate this.

[0076] For example, the second part 32 includes a third segment 323 and a blocking segment 321, the third segment 323 being along a first direction (i.e. Figure 1 The third segment 323 extends along the X direction (as shown), with one end located inside the outlet 13 and spaced apart from it, and the other end connected to the diaphragm 20. The clogging segment 321 extends along the second direction (i.e., along the X direction). Figure 1 Extending in the Y direction (as shown), the blocking segment 321 has a blocking surface 322. In the conductive state, the blocking surface 322 is parallel to the second wall 104 and the diaphragm 20, and the blocking surface 322 and the second wall 104 have a first distance (i.e., Figure 1 shown In the blocked state, the blocking surface 322 adheres to the second wall 104 to block the outlet 13. The third segment 323 ensures the distance from the outlet 13, avoiding undue interference; the specific orientation and spacing of the blocking surface 322 in the open and blocked states ensure the reliability of the flow channel switching and the effectiveness of the seal.

[0077] For example, a medical pressure relief valve for an infusion line has two operating states: an on state (e.g., an open state) and a closed state (e.g., an open state). Figure 1 As shown): When the pressure difference between the inlet channel and the outlet channel is less than the set value At the same time, the plug 30 maintains a distance from the outlet 13. Fluid flows smoothly. Blockage (e.g.) Figure 2 As shown): When the pressure difference is greater than or equal to the set value At that time, the plug 30 blocks the outlet 13, cutting off the fluid passage.

[0078] Specifically, driven by the deformation of the diaphragm 20, the plug 30 moves along the first direction (i.e. Figure 1The membrane 20 moves precisely in the X direction (as shown), and its blocking surface 322 fully adheres to the second wall 104 where the outlet 13 is located, forming a physical sealing barrier. This action instantly cuts off the connection between the inlet and outlet channels, effectively preventing overpressured fluid from continuing to flow to the patient, fundamentally avoiding clinical risks such as venous injury and sudden increases in blood drug concentration that may be caused by instantaneous high-flow-rate infusion. When the abnormal pressure is relieved or restored to the normal infusion pressure range through system self-regulation, the pressure difference acting on both sides of the diaphragm 20 decreases to below the set value. The diaphragm 20 automatically rebounds due to the shape memory properties of its elastic material, driving the plug 30 to reset synchronously, re-establishing a safe distance between the plug 30 and the outlet 13. The infusion channel is then restored to unobstructed flow, ensuring that the treatment process continues under a safe pressure environment, and intelligent switching between the protection state and the normal infusion state can be achieved without manual intervention.

[0079] in, and It has the following relationship:

[0080]

[0081] in, Where E is the first distance, and E is the elastic modulus of the diaphragm material. Let be the Poisson's ratio of the diaphragm material, t be the thickness of the diaphragm, R be the equivalent radius of the diaphragm 20, n be the number of diaphragm holes 21, and r be the radius of the diaphragm holes 21. It is a dimensionless fit index. This is a set value. Among them, The value range is 0.5-150, such as 0.5, 0.9, 5, 25, 60, 80, 102, 132, 150, etc., ensuring the accuracy and reliability of the design. This formula allows for standardized parameter design, facilitating product optimization.

[0082] For example, the formula is based on the theory of large deflection of thin plates, and the physical meaning and design considerations of each parameter are as follows: E represents the elastic modulus of the diaphragm material, which is a physical quantity that measures the material's ability to resist elastic deformation. Poisson's ratio is the ratio of lateral deformation to longitudinal deformation of the diaphragm material under uniaxial tension or compression. A higher elastic modulus can increase the stiffness of the diaphragm 20, but will reduce sensitivity; while an appropriate Poisson's ratio can ensure the controllability of the deformation direction. R is the equivalent radius of the diaphragm 20, which directly affects the effective working area of ​​the diaphragm 20. t is the thickness of the diaphragm 20, which is a key parameter for controlling stiffness. n is the number of diaphragm holes 21, and r is the radius of the diaphragm holes 21; both together determine the fluid permeability and the uniformity of the force on the diaphragm. The total area of ​​the diaphragm holes 21 is nπr. 2 The ratio of nr to the total area πR² of diaphragm 20 2 / R² reflects the weakening effect of the opening ratio on the diaphragm stiffness and pressure-bearing area. It is a dimensionless parameter obtained by fitting a large amount of experimental data, with a value range of 0.5-150. Its main function is to correct the deviation between the theoretical model and the actual structure. The value reflects the degree of influence of factors such as the distribution pattern of the diaphragm holes 21 and boundary conditions on the overall stiffness. The dimensionless exponent for fitting is related to the position, size, and number of membrane pores 21.

[0083] In this embodiment, the shape of the diaphragm 20 is not limited, and it can be circular, square, or other irregular shapes. When the diaphragm 20 is circular, the equivalent radius R is the geometric radius; when the diaphragm 20 is a rectangular diaphragm 20 with length L and width W, the equivalent radius is calculated using the area equivalence method formula: When the diaphragm 20 is a square with a side length of a, the equivalent radius is calculated using the area equivalence method. When the diaphragm 20 has a complex shape, its actual effective area A needs to be calculated first, and then converted into an equivalent radius. .

[0084] For ease of understanding, embodiments of this application provide data on several types of medical pressure-limiting valves for infusion lines:

[0085] The first type is a medical pressure limiting valve for routine adult infusions. Its diaphragm material is medical-grade silicone, with an elastic modulus E=8MPa and a Poisson's ratio of [missing information]. The diaphragm radius is R = 8 mm, the diaphragm thickness is t = 0.4 mm, the number of pores is n = 2, the pore radius is r = 1 mm, and the fitting index is... Set pressure difference When the instantaneous difference in external pressure during infusion reaches 30 kPa, the outlet 13 of the pressure relief valve is completely sealed, i.e., it is in a state of... Figure 2 The state shown; substituting into the formula, we can obtain .

[0086] The second type is a low-pressure medical pressure relief valve, whose diaphragm material is medical-grade silicone. The elastic modulus of the diaphragm material is E=8MPa, and the Poisson's ratio of the diaphragm material is... The diaphragm radius is R = 8 mm, the diaphragm thickness is t = 0.4 mm, the number of pores is n = 2, the pore radius is r = 1 mm, and the fitting index is... Set pressure difference When the instantaneous difference in external pressure during infusion reaches 15 kPa, the outlet 13 of the pressure relief valve is completely sealed, i.e., it is in a state of... Figure 2 The state shown; substituting into the formula, we can obtain .

[0087] The third type is a high-pressure medical pressure relief valve, whose diaphragm material is medical-grade silicone. The elastic modulus of the diaphragm material is E=8MPa, and the Poisson's ratio of the diaphragm material is... The diaphragm radius is R = 10 mm, the diaphragm thickness is t = 0.4 mm, the number of pores is n = 2, the pore radius is r = 1 mm, and the fitting index is... Set pressure difference When the instantaneous difference in external pressure during infusion reaches 40 kPa, the outlet 13 of the pressure relief valve is completely sealed, i.e., it is in a state of... Figure 2 The state shown; substituting into the formula, we can obtain .

[0088] It should be noted that the values ​​listed above are based on... R is used as a variable for explanation, but it is understandable that the material of diaphragm 20 can also be changed, and correspondingly, the elastic modulus E and Poisson's ratio of the diaphragm material will also change. All these will change accordingly; the shape and size of the diaphragm 20 can also be changed, and correspondingly, the diaphragm radius R and the diaphragm thickness t will change accordingly; the number, size, and position of the diaphragm holes 21 can also be changed, and correspondingly, the number of diaphragm holes n, the radius of the diaphragm holes r, and the fitting index will change accordingly. These will all change accordingly. At the same time, these pressure limits... Anchoring should be performed according to the actual situation, and the applicable pressure limit value is usually determined due to different resistance in the infusion tubing. The pressures differ; for example, the initial pressure of a disposable infusion pump is around 40 kPa, while the pressure of some infusions using flow-limiting tubing is usually higher, and the pressure of typical large-volume infusions is mostly around 10 kPa.

[0089] For example, when assembling a medical pressure-limiting valve for an infusion line, the integrated structure of the diaphragm 20 and the plug 30 can be placed inside the left shell 101 first, and then the right shell 102 can be pressed against the left shell 101 through a sealing ring, so that the edge of the diaphragm is firmly clamped. This assembly method is simple and reliable, ensuring the sealing performance of the product.

[0090] The medical pressure-limiting valve for infusion lines of this invention achieves rapid response and high-precision pressure control through precise diaphragm design and pressure calculation. It is particularly suitable for medical infusion systems, ensuring the safety and reliability of the infusion process.

[0091] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A medical pressure-limiting valve for use in infusion lines, characterized in that, include: The housing has a liquid inlet, an inner cavity, and a liquid outlet, wherein the liquid inlet is used to connect to a liquid inlet pipeline, and the liquid outlet is used to connect to a liquid outlet pipeline; A diaphragm is disposed within the inner cavity, dividing the inner cavity into an inlet cavity and an outlet cavity. The inlet cavity communicates with the inlet to form an inlet channel, and the outlet cavity communicates with the outlet to form an outlet channel. The diaphragm is provided with at least one diaphragm hole for connecting the liquid inlet chamber and the liquid outlet chamber, wherein the liquid inlet chamber and the liquid outlet chamber are connected only through the diaphragm hole; A plug is disposed in the inner cavity and connected to the diaphragm; The medical pressure limiting valve used in the infusion line has an open state and a blocked state; In the blocked state, the pressure difference between the inlet channel and the outlet channel is greater than or equal to a set value, and the plug blocks the outlet to prevent the inlet channel and the outlet channel from communicating. In the conductive state, the pressure difference between the inlet channel and the outlet channel is less than the set value, and the plug and the outlet are spaced apart to allow the inlet channel and the outlet channel to communicate.

2. The medical pressure limiting valve for infusion lines according to claim 1, characterized in that, Both the diaphragm and the plug are made of elastic material.

3. The medical pressure limiting valve for infusion lines according to claim 1, characterized in that, The diaphragm and the plug are integrally formed.

4. The medical pressure limiting valve for infusion lines according to claim 1, characterized in that, The plug is provided with a blocking section, the blocking section having a blocking surface; the housing includes a first wall and a second wall, the first wall and the second wall being spaced apart along a first direction; the liquid inlet is located on the first wall, and the liquid outlet is located on the second wall; wherein... In the conductive state, the blocking surface is parallel to the second wall and has a first distance between them; In the blocked state, the blocking surface adheres to the second wall to block the liquid outlet.

5. The medical pressure limiting valve for infusion lines according to claim 4, characterized in that, The relationship between the first distance and the set value satisfies the following formula: in, Where E is the first distance, and E is the elastic modulus of the diaphragm material. Let be the Poisson's ratio of the diaphragm material, t be the thickness of the diaphragm, R be the equivalent radius of the diaphragm, n be the number of pores in the diaphragm, and r be the radius of the pores in the diaphragm. It is a dimensionless fit index. The set value is as described above.

6. The medical pressure limiting valve for infusion lines according to claim 5, characterized in that, The value ranges from 0.5 to 150.

7. The medical pressure limiting valve for infusion lines according to claim 5, characterized in that, The total area of ​​the diaphragm is greater than 40 times the total area of ​​the diaphragm pores, the total area of ​​the diaphragm pores is greater than 1.4 times the cross-sectional area of ​​the liquid outlet pipe, and the total area of ​​the diaphragm pores is less than 3 times the cross-sectional area of ​​the liquid outlet pipe.

8. The medical pressure limiting valve for infusion lines according to claim 1, characterized in that, The membrane has two holes, which are symmetrically arranged with respect to the center of the membrane.

9. The medical pressure limiting valve for infusion lines according to claim 4, characterized in that, The plug includes a first part and a second part symmetrically arranged relative to the diaphragm, the first part being located in the inlet channel and the second part being located in the outlet channel.

10. The medical pressure limiting valve for infusion lines according to claim 9, characterized in that, The first part includes: The first segment extends along the first direction, with one end located at the liquid inlet and spaced apart from the liquid inlet, and the other end connected to the diaphragm. The second segment extends along a second direction and is parallel to and spaced apart from both the first wall and the membrane. The second direction intersects with the first direction.

11. The medical pressure limiting valve for infusion lines according to claim 9, characterized in that, The second part includes the third segment and the blocked segment: wherein, The third segment extends along the first direction, one end of the third segment is located at the liquid outlet and is spaced apart from the liquid outlet, and the other end of the third segment is connected to the membrane; The blocked segment has the blocked surface, which extends along the second direction. In the conductive state, the blocked surface is parallel to and spaced apart from both the second wall and the diaphragm. In the blocked state, the blocked surface is spaced apart from the diaphragm and adheres to the second wall. The second direction intersects with the first direction.

12. The medical pressure limiting valve for infusion lines according to claim 10 or 11, characterized in that, The second direction is perpendicular to the first direction.

13. The medical pressure limiting valve for infusion lines according to claim 9, characterized in that, The housing includes a left shell and a right shell, the left shell and the right shell being sealed together to form the inner cavity, the diaphragm being disposed between the left shell and the right shell and connected to the outer edges of the left shell and the right shell, the first part being located in the left shell and the second part being located in the right shell.

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