A catheter over-bend test fixture
By designing a catheter bending test fixture and utilizing multiple test slots with different radii of curvature, the accuracy and efficiency issues of catheter bending capability testing were solved, enabling rapid and accurate assessment of catheter bending capability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EASYCESS MEDICAL LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-07-07
AI Technical Summary
Existing technologies are insufficient for efficiently testing the bending ability of medical catheters, resulting in low testing accuracy and efficiency.
Design a catheter bending test fixture, comprising a base and multiple test grooves with different radii of curvature, for performing bending tests on catheters at different radii of curvature, and determining the critical value by observing the condition of the catheter tip.
This invention enables the testing of catheters with multiple bends of different radii of curvature on the same fixture, improving the accuracy and efficiency of the testing.
Smart Images
Figure CN224471453U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device manufacturing technology, and in particular to a catheter bending test fixture. Background Technology
[0002] In the field of medical device products, medical catheters used for interventional therapy are very common. Because medical catheters need to navigate the bends and curves within the human body, such as through blood vessels, bending tests are required for intermediate and experimental samples during the development process. Therefore, a fixture capable of efficiently testing the bending ability of medical catheters is needed. Utility Model Content
[0003] To solve at least one of the above-mentioned technical problems, this application provides a catheter bending test fixture that can efficiently test the catheter bending ability. The technical solution adopted is as follows.
[0004] The catheter bending test fixture provided in this application includes a base and a plurality of test slots disposed in the base. The inlet of the test slot is disposed on the side surface of the base. The plurality of test slots have different radii of curvature. The test slots are used for inserting a catheter and guiding the catheter to bend in the test slots.
[0005] In some embodiments of this application, the test slot includes curved segments, and the intervals between the curved segments of the plurality of test slots are the same.
[0006] In some embodiments of this application, the curve segment includes an arc segment, and multiple arc segments are concentrically arranged, with the central angle of the multiple arc segments being the same.
[0007] In some embodiments of this application, the radii of two adjacent arc segments are set at equal intervals.
[0008] In some embodiments of this application, the test groove further includes a straight segment that connects to the entrance of the arc segment.
[0009] In some embodiments of this application, the straight segment in one of the test slots is tangent to the arc segment.
[0010] In some embodiments of this application, the central angle θ of the arc segment satisfies 90°≤θ≤180°.
[0011] In some embodiments of this application, the test slot is configured as a blind slot.
[0012] In some embodiments of this application, the inlet of the test slot is located on the first side of the substrate, and at least some of the end lines of the test slots are parallel to the first side of the substrate.
[0013] In some embodiments of this application, the substrate includes a substrate and a transparent cover plate, a plurality of test slots are disposed within the substrate, and the test slots are open on the surface of the substrate. The transparent cover plate covers the surface of the substrate to close the opening of the test slots.
[0014] The embodiments of this application have at least the following beneficial effects: By setting multiple test slots with different radii of curvature, when testing the bending ability of a conduit, the conduit can first be inserted into the test slot with a larger radius of curvature. When the conduit can smoothly pass through the test slot with that radius of curvature, it is removed and then inserted into a test slot with a slightly smaller radius of curvature, while simultaneously observing the state of the conduit. The radius of curvature of the test slot at this point, where the end of the conduit collapses or the conduit bends, is the critical value of the conduit's tolerance. Using the test fixture provided in this application, multiple test slots with different radii of curvature can be simultaneously mounted on the same fixture, satisfying multiple bend tests of the same conduit with different radii of curvature, or allowing multiple conduits to be tested simultaneously in various test slots, thereby achieving rapid testing of the conduit's bending ability and improving testing accuracy and efficiency. Attached Figure Description
[0015] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.
[0016] Figure 1 This is a schematic diagram of the structure of the conduit bending test fixture provided in the embodiments of this application;
[0017] Figure 2 A schematic diagram of the structure of the base of the conduit bending test fixture provided in the embodiments of this application;
[0018] Figure 3 This is a schematic diagram of the catheter bending test fixture provided in the embodiments of this application when a catheter is inserted for testing;
[0019] Figure 4 This is a bottom view of the base of the conduit bending test fixture provided in the embodiments of this application;
[0020] Figure 5 This is a schematic diagram showing the inward collapse of the catheter tip.
[0021] Figure 6 (a) is a schematic diagram of the structure of a catheter in its normal morphology;
[0022] Figure 6 (b) is a schematic diagram of the structure of the catheter in a bent state.
[0023] Reference numerals: 100, test fixture; 10, substrate; 11, base plate; 12, transparent cover plate; 20, test groove; 21, curved segment; 22, straight segment; 23, inlet; 200, conduit. Detailed Implementation
[0024] The embodiments of this application are described in detail below with reference to 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 application, and should not be construed as limiting this application.
[0025] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0026] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0027] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 application based on the specific circumstances.
[0028] In the description of this application, the use of terms such as "as one implementation," "an embodiment," "some examples," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0029] During the manufacturing process of medical catheters 200, intermediate products, test samples, or finished products need to undergo bending capability testing. Specifically, the bending capability of catheter 200 is demonstrated by whether the tip of catheter 200 collapses inwards when entering a curved channel. Figure 5 As shown in the figure, the end of the conduit 200 is subjected to friction and compressive forces in a curved channel, and the outer side of the end tilts and collapses inward. Therefore, the critical limit value ρ1 of the end of the conduit 200 is obtained through testing, and the minimum curvature radius r1 of the conduit 200 product is designed accordingly. The bending ability of the conduit 200 can also be expressed as whether the conduit 200 bends during the process of entering the curved channel, such as... Figure 6 As shown, Figure 6 (a) shows the catheter 200 in a flexed state. Figure 6 (b) shows the state of the catheter 200 when it is bent (the arrow in the figure indicates the location of the bend). Therefore, the critical radius of curvature ρ2 when the catheter 200 bends is obtained through testing, and the minimum radius of curvature r2 of the catheter 200 is designed based on ρ2. Therefore, when designing the parameters of the catheter 200, r1 and r2 need to be set according to ρ1 and ρ2 respectively, and r1 and r2 need to be set after testing. r1 and r2 are usually slightly larger than the critical value at the point of near failure, and an appropriate margin is set to ensure safe use.
[0030] To meet the above-mentioned bending test requirements for medical catheter 200, this application proposes a catheter 200 bending test fixture 100 (hereinafter referred to as test fixture 100), which includes a base 10 and a plurality of test slots 20 disposed in the base 10. The inlet 23 of the test slot 20 is disposed on the side surface of the base 10. The plurality of test slots 20 have different radii of curvature. The test slots 20 are used for inserting the catheter 200 and guiding the catheter 200 to bend in the test slots 20. By setting multiple test slots 20 with different radii of curvature, when testing the bending ability of the conduit 200, the conduit 200 can first be inserted into the test slot 20 with a larger radius of curvature. When the conduit 200 can smoothly pass through the test slot 20 with that radius of curvature, the conduit 200 is removed and then inserted into a test slot 20 with a slightly smaller radius of curvature. The state of the conduit 200 is observed simultaneously until the end of the conduit 200 collapses or the conduit 200 bends. The radius of curvature of the test slot 20 at this point is the critical value of the conduit 200's tolerance. Using the test fixture 100 provided in this application, multiple test slots 20 with different radii of curvature can be simultaneously installed on the same fixture, satisfying multiple bend tests of the same conduit 200 with different radii of curvature, or satisfying multiple conduits 200 to be tested simultaneously in various test slots 20, thereby realizing rapid testing of the bending ability of the conduit 200 and improving testing accuracy and efficiency.
[0031] In some embodiments, the substrate 10 includes a base plate 11 and a transparent cover plate. A plurality of test grooves 20 are disposed within the base plate 11, with the test grooves 20 having open openings on the surface of the base plate 11. The transparent cover plate 12 covers the surface of the base plate 11 to close the openings of the test grooves 20. By dividing the substrate 10 into two parts, the base plate 11 and the transparent cover plate, it is easier to process the test grooves 20 on the base plate 11, reducing the difficulty of forming the test grooves 20 and making it easier to implement the test grooves 20 on the base plate 11. By covering the surface of the base plate 11 with the transparent cover plate 12, the openings of the test grooves 20 can be closed, thereby forming a unidirectional groove. Making the cover transparent allows for easy observation of the bending of the conduit 200 within the test groove 20 during testing.
[0032] Optionally, the substrate 11 can be made of plastic or resin material, and the transparent cover plate 12 can be made of acrylic sheet. The substrate 11 and the transparent cover plate 12 can be fixedly connected by adhesive.
[0033] Optionally, the cross-sectional shape of the test groove 20 can be rectangular or circular, and there is no limitation here.
[0034] In some embodiments, the test slot 20 includes curved segments 21, and the curved segments 21 of the plurality of test slots 20 are spaced at the same interval. By arranging the curved segments at equal intervals on the substrate 10, the plurality of test slots 20 can be arranged more compactly in the substrate 10, reducing space waste in the substrate 10, and allowing more test slots 20 with different radii of curvature to be set in a limited space.
[0035] In some embodiments, the curve segment 21 includes an arc segment, with multiple arc segments arranged concentrically and having the same central angle. By setting the curve segment 21 in the form of an arc, the radius of curvature is a constant value at any position within the same curve segment 21, facilitating the evaluation of the bending capability of the conduit 200. For example, the radius of the arc segment can be used as an evaluation index for the bending radius of the conduit 200. Of course, in other examples, the curve segment 21 can also be set as a variable diameter curve, for example, with the radius of curvature gradually decreasing along the insertion direction of the conduit 200. The radius of curvature of the curve segment 21 at the location where the conduit 200 fails during insertion into the test slot 20 is the critical tolerance value of the conduit 200.
[0036] In some embodiments, the radii of two adjacent arc segments are set at equal arithmetic progressions. By setting the radii of adjacent arc segments at equal arithmetic progressions, the test radius can be gradually reduced according to a certain gradient during the testing of the catheter 200, thereby improving the accuracy and efficiency of the catheter 200 testing. For example, the arc segments are set with 10 radii, from largest to smallest: 40mm, 37.5mm, 35mm, 32.5mm, 30mm, 27.5mm, 25mm, 22.5mm, 20mm, and 17.5mm, with a radius difference of 2.5mm between two adjacent arc segments. Of course, the number of arc segments can be more than 10 or less, and the radius difference between adjacent arc segments can also be 1mm, 1.5mm, 2mm, 3mm, 5mm, etc., flexibly set according to the size of the catheter 200 to be tested, and is not specifically limited here.
[0037] In some embodiments, the test groove 20 further includes a straight segment 22, which connects to the entrance 23 of the arc segment. By connecting the straight segment 22 to the arc segment and positioning the straight segment 22 at the entrance 23 of the arc segment, the conduit 200 must first pass through the straight segment 22 before entering the arc segment for testing. The straight segment 22 provides guidance for the inserted conduit 200, allowing it to transition more smoothly into the arc segment.
[0038] In some embodiments, the straight segment 22 in a test groove 20 is tangent to the arc segment. By setting the straight segment 22 to be tangent to the arc segment, the smoothness of the connection between the straight segment 22 and the arc segment can be further improved, thereby improving the smoothness of the conduit 200 entering the arc segment.
[0039] In some embodiments, the central angle θ of the arc segment satisfies 90°≤θ≤180°. For example, the central angle θ can be set to 90°, 120°, 150°, 180°, etc. Setting an arc segment with a certain angle can, on the one hand, meet the testing requirements of the conduit 200, ensuring that the conduit 200 has sufficient turning space in the test groove 20; on the other hand, controlling the central angle of the arc segment within the aforementioned range can balance testing efficiency.
[0040] In some embodiments, the test slot 20 is configured as a blind slot. This means that one end of the test slot 20 is configured as an inlet 23, and the other end is disposed within the substrate 10 without penetrating the substrate 10. Thus, during testing, the conduit 200 enters from the inlet 23 of the test slot 20 until the end of the conduit 200 reaches the end of the test slot 20, and then the conduit 200 exits along the original path, completing one test of the conduit 200.
[0041] In some embodiments, the inlets 23 of the test slots 20 are all located on the first side of the substrate 10, and the line connecting the ends of at least some of the test slots 20 is parallel to the first side of the substrate 10. By arranging the ends of the test slots 20 on the same straight line and making the ends of the test slots 20 parallel to the first side of the substrate 10, the arrangement of multiple test slots 20 in the substrate 10 can be made more orderly.
[0042] Optionally, the ends of all test slots 20 can be aligned on a straight line parallel to the first side. Alternatively, the end of the test slot 20 with the smallest radius of curvature protrudes beyond the other test slots 20, thus providing sufficient space for the conduit 200 to pass through for testing.
[0043] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.
Claims
1. A test fixture for testing conduit bends, characterized in that: include Matrix; Multiple test slots are disposed in the substrate, with the inlet of each test slot located on the side surface of the substrate. The multiple test slots have different radii of curvature and are used for inserting a conduit and guiding the conduit to bend within the test slot.
2. The catheter bending test fixture according to claim 1, characterized in that: The test slot includes curved segments, and the intervals between the curved segments of the plurality of test slots are the same.
3. The catheter bending test fixture according to claim 2, characterized in that: The curve segment includes an arc segment, and multiple arc segments are concentrically arranged, with the central angle of the multiple arc segments being the same.
4. The catheter bending test fixture according to claim 3, characterized in that: The radii of two adjacent arc segments are set at equal intervals.
5. The catheter bending test fixture according to claim 3, characterized in that: The test groove also includes a straight section that connects to the entrance of the arc section.
6. The catheter bending test fixture according to claim 5, characterized in that: The straight segment in one of the test slots is tangent to the circular arc segment.
7. The catheter bending test fixture according to claim 3, characterized in that: The central angle θ of the arc segment satisfies 90°≤θ≤180°.
8. The catheter bending test fixture according to any one of claims 1 to 7, characterized in that: The test slot is configured as a blind slot.
9. The catheter bending test fixture according to claim 8, characterized in that: The inlets of the test slots are all located on the first side of the substrate, and at least some of the end lines of the test slots are parallel to the first side of the substrate.
10. The catheter bending test fixture according to any one of claims 1 to 7, characterized in that: The substrate includes a substrate and a transparent cover plate. A plurality of test slots are disposed within the substrate, and the test slots are open on the surface of the substrate. The transparent cover plate covers the surface of the substrate to close the opening of the test slots.