Non-vascular stent film layer rupture strength test tool

Abstract

The utility model relates to non -vascular stent film layer test technical field discloses a non -vascular stent film layer rupture strength test frock, including test board. The utility model technical scheme, through the upper surface of cylinder to test film layer carries out even lamination installation, ensure that film layer and cylinder surface have no gap, no wrinkle, subsequently the arc clamping block lamination in the cylinder outside, in this process, the limiting post on the connecting block of clamping block both sides can insert the limiting block inside of corresponding position, and with the magnetism of limiting block in the suction iron piece fixedly, preliminary realization clamping block and the positioning of cylinder, then through the screw adjusting limiting post outside adjusting block, make it along the axial movement of limiting post and with the connecting block closely abuts, thereby the position of clamping block is locked, effectively avoid the sliding of clamping block along the limiting post in the testing process, can complete the stable fixation to film layer quickly, ensure that film layer always keeps even state in subsequent puncture test.

Description

Technical Field

[0001] This utility model relates to the field of non-vascular stent membrane testing technology, specifically a non-vascular stent membrane rupture strength testing fixture. Background Technology

[0002] In the field of cardiovascular disease treatment, with the rapid development of minimally invasive interventional techniques, membrane-supported cardiovascular implants (such as covered vascular stents, vascular patches, and tubular vascular grafts) have become core devices for repairing vascular damage and treating conditions such as aneurysms and arterial stenosis. The core functional carrier membrane layer of these products not only needs to possess good biocompatibility and blood compatibility to avoid triggering immune rejection or thrombosis, but also needs reliable mechanical properties to withstand the complex physiological loads after implantation. Among these, puncture resistance is one of the key indicators determining the clinical safety and long-term effectiveness of the product.

[0003] In existing technologies, membrane rupture strength testing typically involves laying the membrane flat and then applying puncture force to the membrane at a specified rate using a puncture probe until the membrane ruptures. However, wrinkles can easily form in the membrane during the puncture process, affecting testing efficiency. Therefore, a non-vascular stent membrane rupture strength testing fixture is needed. Utility Model Content

[0004] The purpose of this invention is to provide a non-vascular stent membrane rupture strength testing fixture, which solves the problems mentioned in the background art.

[0005] This application provides a non-vascular stent membrane rupture strength testing fixture, including a testing platform. A fixing plate and a limiting block are fixedly connected to the top of the testing platform. The limiting block is located on one side of the fixing plate. A magnet is fixedly connected inside the limiting block. A connecting plate is transversely inserted through the fixing plate. A membrane-adhering cylinder is fixedly connected to the end of the connecting plate away from the fixing plate. A clamping block is fitted to the top of the cylinder. Connecting blocks are fixedly connected to both outer walls of the clamping block. A limiting post is inserted through the connecting block. The limiting post extends into the limiting block and is magnetically attracted to the magnet. An adjusting block is spirally attached to the outside of the limiting post. The bottom end of the adjusting block abuts against the top end of the connecting block.

[0006] In use, first, the test membrane is flatly and adhered to the upper surface of the cylinder, ensuring that there are no gaps or wrinkles between the membrane and the cylinder surface. Then, the arc-shaped clamp is attached to the outside of the cylinder. During this process, the limiting posts on the connecting blocks on both sides of the clamp can be inserted into the corresponding limiting blocks and quickly magnetically fixed with the magnets inside the limiting blocks, initially achieving the positioning of the clamp and the cylinder. Next, the adjusting block outside the limiting post is adjusted by screwing it to move along the axis of the limiting post and tightly abut against the connecting block, thereby locking the position of the clamp and effectively preventing the clamp from sliding along the limiting post during the test. Then, the electric push rod is activated, which drives the puncture probe to move downward at a constant speed along the coaxial direction of the circular hole on the cylinder, accurately puncturing the test area of ​​the membrane and completing the membrane's burst strength test.

[0007] Optionally, a vertical plate is fixedly connected to the top of the test platform, the vertical plate is located behind the fixed plate, an electric push rod is fixedly inserted through the top of the vertical plate, a fixed block is fixedly connected to the end face of the piston rod of the electric push rod, and a puncture probe is threadedly connected to the bottom end of the fixed block.

[0008] By adopting the above technical solution, the fixing block can realize the quick assembly and disassembly of the puncture probe, and the electric push rod can drive the puncture probe to rise and fall, simulating the slower puncture force process in actual use, so as to realize the testing of the membrane layer.

[0009] Optionally, the bottom end of the puncture probe is arc-shaped.

[0010] By adopting the above technical solution, high pressure is avoided at the needle tip to prevent the membrane from rupturing instantly.

[0011] Optionally, two clamping blocks are provided, and the two clamping blocks are symmetrically arranged about the axis of the cylinder. The clamping blocks have a semi-arc structure, and the arc of the groove of the clamping block is consistent with the curvature of the upper half of the outer wall of the cylinder.

[0012] By adopting the above technical solution, a large-area bonding is achieved, improving the fixation effect of the film layer.

[0013] Optionally, the inner wall of the clamping block is fixed with a rubber layer by adhesive.

[0014] By adopting the above technical solution, the rubber layer can avoid direct contact between the clamping block and the membrane layer, so as to avoid wear on the membrane layer.

[0015] Optionally, a through-hole is provided at the middle position of the cylinder, the diameter of the hole being larger than the outer diameter of the puncture probe, and the hole being coaxial with the puncture probe.

[0016] By adopting the above technical solution, the cylinder is prevented from obstructing the normal downward movement of the puncture probe, so as not to affect the testing of the membrane layer.

[0017] Optionally, an extension screw is provided at the top of the fixing plate, and the extension screw is threadedly connected to the connecting plate.

[0018] By adopting the above technical solution, the stability of the connecting plate installation is further improved.

[0019] Optionally, the limiting post is made of iron.

[0020] By adopting the above technical solution, it is possible to achieve magnetic fixation with the magnet.

[0021] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0022] In this technical solution, the test membrane layer is smoothly and firmly installed on the upper surface of the cylinder, ensuring that there are no gaps or wrinkles between the membrane layer and the cylinder surface. Then, the arc-shaped clamping block is attached to the outside of the cylinder. During this process, the limiting posts on the connecting blocks on both sides of the clamping block can be inserted into the corresponding limiting blocks and quickly magnetically fixed with the magnets inside the limiting blocks, initially achieving the positioning of the clamping block and the cylinder. Then, by adjusting the adjusting block outside the limiting post with a screw, it is moved along the axis of the limiting post and tightly abuts against the connecting block, thereby locking the position of the clamping block and effectively preventing the clamping block from sliding along the limiting post during the test. Through the coordinated cooperation of the above structures, the membrane layer can be quickly and stably fixed, ensuring that the membrane layer remains flat in the subsequent puncture test and avoiding the formation of wrinkles. This eliminates the cumbersome calibration steps in the traditional fixing method and improves the efficiency of the test operation. Attached Figure Description

[0023] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of a non-vascular stent membrane rupture strength testing fixture according to the present invention;

[0025] Figure 2 for Figure 1 A magnified schematic diagram of the local structure of region A;

[0026] Figure 3 This is a cross-sectional view of the limiting block of a non-vascular stent membrane rupture strength testing fixture according to the present invention.

[0027] Figure 4 This is a schematic diagram of the clamping block of a non-vascular stent membrane rupture strength testing fixture according to the present invention;

[0028] Figure 5 This is a schematic diagram of the cylindrical body of a non-vascular stent membrane rupture strength testing fixture according to the present invention;

[0029] In the diagram: 1. Test platform; 2. Puncture probe; 3. Fixing block; 4. Electric push rod; 5. Vertical plate; 6. Clamping block; 7. Extending screw; 8. Connecting plate; 9. Fixing plate; 10. Connecting block; 11. Limiting block; 12. Limiting post; 13. Cylinder; 14. Adjusting block; 15. Magnet; 16. Rubber layer; 17. Round hole. Detailed Implementation

[0030] Please see Figure 1-5 This utility model provides a technical solution: a non-vascular stent membrane rupture strength testing fixture, including a test platform 1. A fixing plate 9 and a limiting block 11 are fixedly connected to the top of the test platform 1. The limiting block 11 is located on one side of the fixing plate 9. A magnet 15 is fixedly connected inside the limiting block 11. A connecting plate 8 is transversely inserted through the fixing plate 9. An extension screw 7 is inserted through the top of the fixing plate 9 and threadedly connected to the connecting plate 8. This further improves the stability of the connecting plate 8 installation. A membrane-adhering cylinder 13 is fixedly connected to the end of the connecting plate 8 away from the fixing plate 9. A clamping block 6 is attached to the top of the cylinder 13. Two clamping blocks 6 are provided, and the two clamping blocks 6 are connected to each other. The axis of the cylinder 13 is symmetrically arranged on both sides of the axis of symmetry. The clamping block 6 has a semi-arc structure. The arc of the groove of the clamping block 6 is consistent with the curvature of the upper half of the outer wall of the cylinder 13. This forms a large-area fit, which improves the fixing effect of the membrane layer. The inner wall of the clamping block 6 is glued and fixed with a rubber layer 16. The rubber layer 16 can prevent the clamping block 6 from directly contacting the membrane layer to avoid abrasion of the membrane layer. Both sides of the outer wall of the clamping block 6 are fixedly connected with connecting blocks 10. A limiting post 12 is passed through the connecting block 10. The limiting post 12 extends into the interior of the limiting block 11 and is magnetically fixed with the magnet 15. An adjusting block 14 is spirally attached to the outside of the limiting post 12. The bottom end of the adjusting block 14 abuts against the top end of the connecting block 10.

[0031] In the technical solution of this utility model, a vertical plate 5 is fixedly connected to the top of the test platform 1. The vertical plate 5 is located behind the fixed plate 9. An electric push rod 4 is fixedly inserted through the top of the vertical plate 5. A fixed block 3 is fixedly connected to the end face of the piston rod of the electric push rod 4. A puncture probe 2 is threadedly connected to the bottom end of the fixed block 3. The fixed block 3 can realize the quick assembly and disassembly of the puncture probe 2. The electric push rod 4 can drive the puncture probe 2 to rise and fall, simulating the slower puncture external force process in actual use, and realizing the testing of the membrane layer.

[0032] In the technical solution of this utility model, the bottom end of the puncture probe 2 is arc-shaped; to avoid the generation of high pressure at the needle tip, so as to prevent the membrane layer from rupturing instantly.

[0033] In the technical solution of this utility model, a through-hole 17 is provided in the middle of the cylinder 13. The diameter of the hole 17 is larger than the outer diameter of the puncture probe 2. The hole 17 and the puncture probe 2 are coaxially arranged to avoid the cylinder 13 from obstructing the normal downward movement of the puncture probe 2, so as not to affect the testing of the membrane layer.

[0034] In the technical solution of this utility model, the limiting post 12 is made of iron and can be magnetically fixed with the magnet 15.

[0035] In use, the test membrane is first flatly and adhered to the upper surface of the cylinder 13, ensuring that there are no gaps or wrinkles between the membrane and the surface of the cylinder 13. Then, the arc-shaped clamp 6 is attached to the outside of the cylinder 13. During this process, the limiting posts 12 on the connecting blocks 10 on both sides of the clamp 6 can be inserted into the corresponding limiting blocks 11 and quickly magnetically fixed with the magnet 15 inside the limiting blocks 11, thus initially positioning the clamp 6 and the cylinder 13. Next, the adjusting block 14 outside the limiting post 12 is adjusted by screwing it to move along the axis of the limiting post 12 and tightly abut against the connecting block 10, thereby locking the position of the clamp 6 and effectively preventing the clamp 6 from sliding along the limiting post 12 during the test. Then, the electric push rod 4 is activated, and the electric push rod 4 drives the puncture probe 2 to move down at a constant speed along the coaxial direction of the circular hole 17 on the cylinder 13, accurately puncturing the test area of ​​the membrane and completing the membrane rupture strength test.

Claims

1. A fixture for testing the rupture strength of a non-vascular stent membrane, characterized in that: The test platform (1) is provided with a fixed plate (9) and a limiting block (11) fixedly connected to its top. The limiting block (11) is located on one side of the fixed plate (9). A magnet (15) is fixedly connected inside the limiting block (11). A connecting plate (8) is horizontally inserted through the fixed plate (9). A cylindrical body (13) with a film layer is fixedly connected to the end of the connecting plate (8) away from the fixed plate (9). A clamping block (6) is attached to the top of the cylindrical body (13). A connecting block (10) is fixedly connected to the outer walls of both sides of the clamping block (6). A limiting post (12) is inserted through the connecting block (10). The limiting post (12) extends into the interior of the limiting block (11) and is magnetically fixed to the magnet (15). An adjusting block (14) is spirally attached to the outside of the limiting post (12). The bottom end of the adjusting block (14) abuts against the top end of the connecting block (10).

2. The non-vascular stent membrane rupture strength testing fixture according to claim 1, characterized in that, A vertical plate (5) is fixedly connected to the top of the test platform (1). The vertical plate (5) is located behind the fixed plate (9). An electric push rod (4) is fixedly inserted through the top of the vertical plate (5). A fixed block (3) is fixedly connected to the end face of the piston rod of the electric push rod (4). A puncture probe (2) is threadedly connected to the bottom end of the fixed block (3).

3. The non-vascular stent membrane rupture strength testing fixture according to claim 2, characterized in that, The bottom end of the puncture probe (2) is arc-shaped.

4. The non-vascular stent film layer rupture strength test tool of claim 1, wherein, There are two clamping blocks (6). The two clamping blocks (6) are symmetrically arranged on the left and right with the axis of the cylinder (13) as the axis of symmetry. The clamping blocks (6) have a semi-arc structure. The arc of the groove of the clamping block (6) is consistent with the curvature of the upper half of the outer wall of the cylinder (13).

5. The non-vascular stent film layer rupture strength test tool of claim 1, wherein, The inner wall of the clamp (6) is fixed with a rubber layer (16) by adhesive.

6. The non-vascular stent membrane rupture strength testing fixture according to claim 1, characterized in that, A through-hole (17) is provided in the middle of the cylinder (13). The diameter of the hole (17) is larger than the outer diameter of the puncture probe (2). The hole (17) and the puncture probe (2) are coaxially arranged.

7. The non-vascular stent membrane rupture strength testing fixture according to claim 1, characterized in that, An extension screw (7) is threaded through the top of the fixing plate (9), and the extension screw (7) is threadedly connected to the connecting plate (8).

8. The non-vascular stent membrane rupture strength testing fixture according to claim 1, characterized in that, The limiting post (12) is made of iron.

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