Filter liquid medicine filter membrane detection tool and medical equipment
By designing a testing fixture for filter liquid filtration membranes, and adjusting the degree of compression of the filtration membrane using upper shells of different thicknesses, and recording the critical value, the problem of inaccurate detection of filtration membrane compression was solved, achieving higher detection accuracy and cost-effectiveness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG WEIGAO GROUP MEDICAL POLYMER
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-07
AI Technical Summary
Existing technology cannot accurately measure the compression of the drug solution filtration membrane, resulting in inaccurate detection of the automatic liquid stop function of precision filters.
Design a testing fixture for drug solution filtration membranes. By changing the upper shell with different thicknesses, observe the range of compression of the drug solution filtration membrane, simulate the change of the liquid-stopping function of the infusion set, and record the critical value to determine the effective compression amount.
The operation steps were simplified, the accuracy and reusability of the drug solution filtration membrane compression detection were improved, and the cost was reduced.
Smart Images
Figure CN224462559U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and more specifically, to a testing fixture for a filter drug solution filtration membrane. Furthermore, this utility model also relates to a medical device comprising the aforementioned testing fixture for a filter drug solution filtration membrane. Background Technology
[0002] The automatic shut-off function of a precision filter infusion set is a safety design intended to automatically stop fluid flow and prevent air from entering the bloodstream when the infusion ends. This function is achieved through the action of the precision filter, which mainly consists of an upper shell, a lower shell, and a drug-eluting membrane between the upper and lower shells. The microporous structure of the drug-eluting membrane forms a "liquid film barrier" through surface tension when the fluid has finished flowing, preventing gas from passing through. This creates a low-pressure space within the lower shell cavity of the precision filter. When the blood vessel pressure and the fluid pressure inside the infusion set reach equilibrium, the fluid flow stops, automatically stopping the infusion. The drug-eluting membrane is fixed between the upper and lower shells by compression. Preventing air from entering the lower shell space through the compression point is one of the key factors for the shut-off function to be effective; therefore, the compression of the drug-eluting membrane needs to be measured and verified.
[0003] Current filter infusion sets are manufactured using injection-molded upper and lower shells that are ultrasonically welded together. At the same time, the drug solution filter membrane is compressed and assembled into a precision filter. The precision filter is randomly inspected, and purified water is injected after connecting the tubing to test the automatic liquid stop function. Due to the dimensional fluctuations caused by the deformation of the upper and lower shells during injection molding, as well as the instability of the gap between the ultrasonic welding surfaces, it is impossible to accurately measure the compression of the drug solution filter membrane.
[0004] In conclusion, improving the accuracy of drug film compression detection is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0005] In view of this, the purpose of this utility model is to provide a testing fixture for drug filter membranes. By changing the upper shell with different thicknesses of the pressing platform, the drug filter membrane can be tested. Repeated experiments can observe the process of the infusion set's stopping function from failure to effectiveness and back to failure, and the effective range of the drug filter membrane compression can be detected.
[0006] Another objective of this invention is to provide a medical device comprising the above-mentioned filter for detecting drug solution filtration membrane.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A filter solution filtration membrane testing fixture for connecting to an infusion set, the filter solution filtration membrane testing fixture comprising:
[0009] The lower shell is provided with a detection groove and a drain channel communicating with the detection groove, the drain channel being used to connect to the downstream pipeline of the infusion set;
[0010] A drug solution filter membrane is disposed within the detection groove;
[0011] The upper shell is detachably connected to the lower shell. The upper shell is provided with a pressing platform for inserting into the detection groove to press and position the drug solution filter membrane. The upper shell is also provided with a liquid inlet channel communicating with the detection groove. The liquid inlet channel is used to connect to the upstream pipeline of the infusion set. The drain channel and the liquid inlet channel are respectively located on both sides of the drug solution filter membrane. There are several upper shells, and the thickness of the pressing platform of the several upper shells is different.
[0012] Preferably, a filter membrane mounting seat is provided in the detection groove, the filter membrane mounting seat is an annular structure extending towards the center along the radial direction of the inner wall of the detection groove, and the membrane pressing platform is an annular protrusion that matches the filter membrane mounting seat.
[0013] Preferably, the surface of the lower shell is further provided with an annular sealing groove, and a sealing ring is provided in the sealing groove.
[0014] Preferably, the drain channel is located in the middle of the lower shell, the inlet channel is located in the middle of the upper shell, and the inlet channel and the drain channel are arranged opposite to each other.
[0015] Preferably, a plurality of support columns for supporting the drug solution filter membrane are evenly distributed in the detection groove, and the plurality of support columns are arranged perpendicular to the surface of the detection groove.
[0016] Preferably, the lower shell and the upper shell are provided with corresponding through holes, the through holes are provided through the lower shell and the upper shell, and a pressure screw is provided in the through hole. The pressure screw cooperates with the nut to realize the connection between the lower shell and the upper shell.
[0017] Preferably, both the lower shell and the upper shell are stainless steel components.
[0018] Preferably, the surface of the upper shell is marked with a mark for indicating the thickness of the pressing platform.
[0019] Preferably, both the drain channel and the inlet channel are provided with fixing components for connecting the infusion set on their outer periphery.
[0020] A medical device includes a filter drug solution filtration membrane testing fixture, wherein the filter drug solution filtration membrane testing fixture is any one of the filter drug solution filtration membrane testing fixtures described above.
[0021] This utility model provides a testing fixture for a drug-eluting filter membrane. The fixture has a drug-eluting filter membrane disposed between its lower and upper shells, which are detachably connected. A pressing platform on the surface of the upper shell presses the filter membrane against the lower shell. An inlet channel on the upper shell and a outlet channel on the lower shell are respectively located on both sides of the filter membrane. The inlet channel communicates with the upstream channel of the infusion set, and the outlet channel communicates with the downstream channel. Multiple upper shells are provided, each with a different pressing platform thickness. By replacing different upper shells, the gap between the upper and lower shells can be adjusted, thereby adjusting the degree of compression of the filter membrane. By sequentially replacing upper shells with increasing pressing platform thicknesses and repeating the test, the process of the infusion set's stopping function from failure to effectiveness and back to failure can be observed, thus detecting the effective range of the filter membrane compression.
[0022] Compared with the prior art, the filter liquid filtration membrane testing fixture of this application simplifies the operation steps and makes the process of testing the liquid filtration membrane simpler. It can test liquid filtration membranes of different thicknesses. In addition, the fixture can be reused, saving costs. Most importantly, the fixture can more accurately measure the compression range when the liquid filtration membrane is functional, depending on the replacement and selection of the upper shell. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0024] Figure 1 This is a cross-sectional view of the filter liquid filtration membrane testing fixture provided by this utility model;
[0025] Figure 2 This is a schematic diagram of the lower shell provided by this utility model;
[0026] Figure 3 This is a schematic diagram of the upper shell provided by this utility model;
[0027] Figure 4 This is a schematic diagram of the structure of the drug solution filtration membrane provided by this utility model;
[0028] Figure 5 This is a schematic diagram of the structure of the pressure screw provided by this utility model;
[0029] Figure 6 This is a schematic diagram of the sealing ring provided by this utility model.
[0030] Figure label:
[0031] 1-Lower shell; 2-Detection groove; 3-Drainage channel; 4-Drug solution filter membrane; 5-Upper shell; 6-Pressure plate; 7-Inlet channel; 8-Filter membrane mounting base; 9-Sealing ring; 10-Support column; 11-Pressure screw; 12-Drain port; 13-Inlet port. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] The core of this utility model is to provide a testing fixture for filter liquid filtration membranes. This fixture can be changed by replacing the upper shell, and the thickness of the membrane pressing platform on the upper shell is different, so as to more conveniently and accurately measure the compression range when the liquid filtration membrane is functional.
[0034] Another core aspect of this invention is to provide a medical device comprising the above-mentioned filter for detecting drug solution filtration membranes.
[0035] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0036] This application provides a filter drug filtration membrane testing fixture for connecting to an infusion set. The filter drug filtration membrane testing fixture includes: a lower shell 1, a drug filtration membrane 4, and an upper shell 5.
[0037] The lower shell 1 has a detection groove 2 on its surface and a drain channel 3 that communicates with the detection groove 2. The drain channel 3 is used to connect to the downstream pipeline of the infusion set.
[0038] The drug solution filter membrane 4 is placed inside the detection groove 2;
[0039] The upper shell 5 and the lower shell 1 are detachably connected. The upper shell 5 is provided with a pressing platform 6 for inserting into the detection groove 2 to press and position the drug solution filter membrane 4. The upper shell 5 is also provided with an inlet channel 7 that communicates with the detection groove 2. The inlet channel 7 is used to connect to the upstream pipeline of the infusion set. The drain channel 3 and the inlet channel 7 are respectively located on both sides of the drug solution filter membrane 4. There are several upper shells 5, and the thickness of the pressing platform 6 of the several upper shells 5 is different.
[0040] Specifically, the structure of the lower shell 1 can be found in the attached diagram. Figure 2 The structure of the upper shell 5 can be referenced in the appendix. Figure 3 The structure of the drug solution filtration membrane can be found in the attached document. Figure 4 The overall structure of the filter liquid filtration membrane testing fixture can be found in the attached document. Figure 1 The lower shell 1 has a detection groove 2 on its upper surface. The detection groove 2 is a cylindrical recess located at the center of the surface of the lower shell 1. A drain port 12 is provided in the detection groove 2, which is connected to the drain channel 3. The lower shell 1 also has an upper shell 5 that is detachably connected to it. The surface of the upper shell 5 is provided with a pressing platform 6. When the upper shell 5 is connected to the lower shell 1, the pressing platform 6 extends towards the lower shell 1. A drug solution filter membrane 4 is provided between the upper shell 5 and the lower shell 1. The pressing platform 6 can press the drug solution filter membrane 4 and position it. The upper shell 5 also has a liquid inlet 13, which is connected to the liquid inlet channel 7. When the upper shell 5 is connected to the lower shell 1, the liquid inlet 13 and the drain port 12 are respectively located on both sides of the drug solution filter membrane 4. When the liquid inlet channel 7 is connected to the upstream of the infusion set, the liquid in the infusion set flows through the liquid inlet channel. The liquid enters the detection groove 2 through the inlet 7 and inlet 13. After passing through the drug filter membrane 4, the liquid flows into the downstream pipeline of the infusion set through the outlet 12 and outlet channel 3. Simulating clinical use, the infusion set is passed through the drug solution to observe whether the infusion set has a stopping function. It should be noted that there are multiple upper shells 5. The difference between the multiple upper shells 5 is that the thickness of the pressure plate 6 of the different upper shells 5 is different. The pressure plate 6 works with the lower shell 1 to compress the drug filter membrane 4. During use, the upper shells 5 need to be replaced in sequence, with the thickness of the pressure plate 6 increasing, so as to reduce the distance between the pressure plate 6 and the lower shell 1. The distance between the pressure plate 6 and the lower shell 1 can also be understood as the thickness of the drug filter membrane 4 after compression. Thus, the process of the infusion set's stopping function from failure to effectiveness and back to failure can be observed, thereby detecting the effective range of the compression of the drug filter membrane 4.
[0041] It needs further explanation that the initial distance between the pressing platform 6 and the lower shell 1 is relatively large, causing the liquid filter membrane 4 to fail to stop the liquid. As the upper shell 5 is gradually replaced in the aforementioned order, until the distance between the pressing platform 6 and the lower shell 1 decreases to the first critical value of the liquid filter membrane 4, the liquid-stopping function of the liquid filter membrane 4 becomes effective. The critical value at this time is recorded. Then, the upper shell 5 is replaced in the above order until the liquid filter membrane 4 reaches the second critical value. When the compression of the liquid filter membrane 4 exceeds the second critical value, the liquid filter membrane 4 can no longer stop the liquid due to over-compression. At this time, the value of the second critical value needs to be recorded. Based on the values of the two critical values, the effective range of the compression of the liquid filter membrane 4 can be measured.
[0042] It can be seen that the filter liquid filtration membrane testing fixture provided in this application can detect the effective compression range of the liquid filtration membrane 4 compared with the prior art. The entire operation process only requires disassembling and replacing the upper shell 5 and recording the critical value. The operation is convenient, and since different upper shells 5 have corresponding parameters, data errors will not occur, and the accuracy of the test results can be guaranteed to a certain extent.
[0043] Based on the above embodiment, a filter membrane mounting seat 8 is provided in the detection groove 2. The filter membrane mounting seat 8 is an annular structure that extends towards the center along the radial direction of the inner wall of the detection groove 2. The pressing platform 6 is an annular protrusion that matches the filter membrane mounting seat 8.
[0044] For details, please refer to the appendix. Figure 1 With appendix Figure 2 The detection groove 2 is provided with a filter membrane mounting seat 8 extending from its side wall toward the center. The pressing platform 6 is an annular protrusion that matches the filter membrane mounting seat 8. When the upper shell 5 is connected to the lower shell 1, there is a certain gap between the pressing platform 6 and the filter membrane mounting seat 8. The thickness of this gap is the thickness of the compressed drug solution filter membrane 4.
[0045] In some embodiments, the surface of the lower shell 1 is further provided with an annular sealing groove, and a sealing ring 9 is provided in the sealing groove.
[0046] For details regarding the structure of the sealing groove, please refer to the attached document. Figure 1 With appendix Figure 2 Please refer to the attached document for the structure of sealing ring 9. Figure 6 Before connecting the upper shell 5 and the lower shell 1, the sealing ring 9 needs to be placed in the sealing groove to ensure that when connected to the infusion set, the cavity between the upper shell 5 and the lower shell 1 is a sealed cavity and will not affect the liquid-stopping function of the drug filter membrane 4.
[0047] In some embodiments, the drain channel 3 is located in the middle of the lower shell 1, and the inlet channel 7 is located in the middle of the upper shell 5, with the inlet channel 7 and the drain channel 3 facing each other.
[0048] For details, please refer to the appendix. Figure 1 The drain channel 3 is located in the middle right side of the lower shell 1, and the inlet channel 7 is located in the middle left side of the upper shell 5. Setting the drain channel 3 and the inlet channel 7 in the middle can ensure the reliability of the structure. The inlet channel 7 and the drain channel 3 are arranged opposite to each other so that the liquid can fully pass through the liquid filter membrane 4 after flowing out of the inlet channel 7 and then enter the drain channel 3.
[0049] In some embodiments, a plurality of support columns 10 for supporting the drug solution filter membrane 4 are evenly distributed in the detection groove 2, and the plurality of support columns 10 are arranged perpendicular to the surface of the detection groove 2.
[0050] Specifically, the structure and location distribution of the support column 10 can be found in the appendix. Figure 2 In this application, the number of support columns 10 is preferably four, and the four support columns 10 are arranged in a square. As the liquid flows from the upper shell 5 to the lower shell 1, it will exert a force on the liquid filter membrane 4. In order to prevent the liquid filter membrane 4 from deforming significantly, four support columns 10 are designed. The support columns 10 can effectively support the liquid filter membrane 4.
[0051] In some embodiments, the lower shell 1 and the upper shell 5 are provided with corresponding through holes, which are provided through the lower shell 1 and the upper shell 5. A pressure screw 11 is provided in the through hole, and the pressure screw 11 cooperates with the nut to realize the connection between the lower shell 1 and the upper shell 5.
[0052] For details, please refer to the appendix. Figure 2 With appendix Figure 3 Both the lower shell 1 and the upper shell 5 are provided with through holes that penetrate the plate surface. The number of through holes is set to three, which can ensure the reliability of the connection between the lower shell 1 and the upper shell 5 without causing excessive workload for installation and disassembly.
[0053] Optionally, the perforation provided on the lower housing 1 can be a threaded hole to replace the nut, thus simplifying the equipment.
[0054] In some embodiments, both the lower shell 1 and the upper shell 5 are stainless steel components.
[0055] Specifically, both the lower shell 1 and the upper shell 5 are made of stainless steel, ensuring the accuracy of each mating dimension. In addition, the lower shell 1 and the drain channel 3, and the upper shell 5 and the inlet channel 7 are all integrated components, which can improve the structural reliability.
[0056] In some embodiments, the surface of the upper shell 5 is provided with markings for indicating the thickness of the pressing platform 6.
[0057] Specifically, since the thickness of the pressing platform 6 on each upper shell 5 is different, a corresponding mark needs to be set on the upper shell 5. This mark is used to annotate the thickness of the pressing platform 6 so that the effective range of the compression thickness of the drug solution filter membrane 4 can be recorded more conveniently when the drug solution filter membrane 4 is tested.
[0058] Based on the above embodiments, both the drainage channel 3 and the inlet channel 7 are provided with fixing components for connecting the infusion set on their outer periphery.
[0059] Specifically, the outer periphery of the drain channel 3 and the inlet channel 7 is a tubular base. Therefore, a fixing component or a connecting component needs to be set on the outer periphery of the tubular base to connect the lower shell 1 and the upper shell 5 in the infusion set pipeline. On this basis, it is also necessary to ensure the sealing of the entire pipeline in order to conduct the test of the drug solution filter membrane 4.
[0060] In addition to the above-mentioned filter drug filtration membrane testing fixture, this utility model also provides a medical device including the filter drug filtration membrane testing fixture disclosed in the above embodiments. For the structure of other parts of the medical device, please refer to the prior art, which will not be described in detail here.
[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0062] The above provides a detailed description of the filter liquid filtration membrane testing fixture and medical device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A testing fixture for a filter membrane used to test drug solution, for connecting to an infusion set, characterized in that, The filter solution filtration membrane testing fixture includes: The lower shell (1) is provided with a detection groove (2) and a drain channel (3) communicating with the detection groove (2), the drain channel (3) being used to connect to the downstream pipeline of the infusion set; A drug solution filter membrane (4) is disposed in the detection groove (2); The upper shell (5) is detachably connected to the lower shell (1). The upper shell (5) is provided with a pressing platform (6) for inserting into the detection groove (2) to press and position the drug solution filter membrane (4). The upper shell (5) is also provided with an inlet channel (7) communicating with the detection groove (2). The inlet channel (7) is used to connect to the upstream pipeline of the infusion set. The drain channel (3) and the inlet channel (7) are respectively located on both sides of the drug solution filter membrane (4). The upper shell (5) is provided with several pressing platforms (6), and the thickness of the pressing platforms (6) of the several upper shells (5) is different.
2. The filter liquid filtration membrane testing fixture according to claim 1, characterized in that, The detection groove (2) is provided with a filter membrane mounting seat (8), which is an annular structure extending towards the center along the radial direction of the inner wall of the detection groove (2), and the pressing platform (6) is an annular protrusion that matches the filter membrane mounting seat (8).
3. The filter liquid filtration membrane testing fixture according to claim 1, characterized in that, The surface of the lower shell (1) is also provided with an annular sealing groove, and a sealing ring (9) is provided in the sealing groove.
4. The filter liquid filtration membrane testing fixture according to claim 1, characterized in that, The drain channel (3) is located in the middle of the lower shell (1), and the inlet channel (7) is located in the middle of the upper shell (5), with the inlet channel (7) and the drain channel (3) facing each other.
5. The filter liquid filtration membrane testing fixture according to claim 1, characterized in that, The detection groove (2) is uniformly distributed with a number of support columns (10) for supporting the drug solution filter membrane (4), and the support columns (10) are arranged perpendicular to the surface of the detection groove (2).
6. The filter liquid filtration membrane testing fixture according to claim 1, characterized in that, The lower shell (1) and the upper shell (5) are provided with corresponding through holes. The through holes are provided through the lower shell (1) and the upper shell (5). A pressure screw (11) is provided in the through hole. The pressure screw (11) cooperates with the nut to realize the connection between the lower shell (1) and the upper shell (5).
7. The filter liquid filtration membrane testing fixture according to claim 1, characterized in that, Both the lower shell (1) and the upper shell (5) are stainless steel components.
8. The filter liquid filtration membrane testing fixture according to claim 1, characterized in that, The surface of the upper shell (5) is marked with a mark for indicating the thickness of the pressing platform (6).
9. The filter liquid filtration membrane testing fixture according to any one of claims 1 to 8, characterized in that, Both the drainage channel (3) and the inlet channel (7) are provided with fixing components for connecting the infusion set.
10. A medical device, comprising a filter drug solution filtration membrane detection fixture, characterized in that, The filter liquid filtration membrane testing fixture is the filter liquid filtration membrane testing fixture as described in any one of claims 1 to 9.