Tibial liner locking experimental tooling

Abstract

The present invention relates to the technical field of tooling fixtures for orthopedic knee joint products, and discloses a tibial liner locking test tool, comprising a locking block, a tooling block and a tooling handle, wherein the locking block has a docking hole adapted to the outer shape of the tibial platform pad column, the tooling block is sleeved on the outer side of the locking block and the two are clearance-matched, the locking block and the tooling block are respectively provided with four threaded holes, the threaded holes on the locking block are internal threaded holes, the internal threaded holes are connected to the docking holes, the threaded holes on the tooling block are external threaded holes, the angle between the axes of adjacent internal threaded holes is ∠A, the angle between the axes of adjacent external threaded holes is ∠B, ∠A=90°, ∠B=90°; the tibial liner locking test tool provided by the present invention solves the problem that the existing design operation is more troublesome, and the surface of the product in contact with the metal rod may be too smooth, resulting in inaccurate experimental data.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling fixtures for orthopedic knee joint products, and in particular to a tibial liner locking experimental tooling. Background Art

[0002] Existing knee tibial plateau pad products have a column design. Based on the principle that stress is more concentrated on the column during the movement and flexion of the knee prosthesis, the existing tibial plateau pad locking test adopts the following method:

[0003] The tibial plateau support and pad are directly assembled, then secured to a testing machine. Using a press-fit method, a metal rod is aligned with the center of the tibial plateau pad column and pressed downward to perform the locking strength test. Because stress is concentrated in the column, the loading position during testing must be reflected at the column. Existing technology applies external force to the tibial plateau pad column through a press-fit method.

[0004] This experimental method has the following shortcomings: since the metal rod needs to be aligned with the center of the tibial plateau pad column, the position of the metal rod needs to be adjusted multiple times to align it with the center of the column, which is a more cumbersome operation. In addition, the surface where the product contacts the metal rod may be too smooth, affecting the pressure effect, thereby resulting in inaccurate experimental data. Summary of the Invention

[0005] The object of the present invention is to provide a tibial liner locking experimental tool to solve at least one of the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A tibial pad locking experimental tool, comprising a locking block, a tooling block and a tooling handle, the locking block having a docking hole adapted to the outer shape of the tibial plateau pad column, the tooling block being sleeved on the outer side of the locking block with clearance fit between the two, the locking block and the tooling block being respectively provided with four threaded holes, the threaded holes on the locking block being internal threaded holes, the internal threaded holes being connected to the docking holes, the threaded holes on the tooling block being external threaded holes, the angle between the axes of adjacent internal threaded holes being ∠A, the angle between the axes of adjacent external threaded holes being ∠B, ∠A=90°, ∠B=90°, and one end of the tooling handle being threadedly fitted with the external threaded holes and the internal threaded holes in the same direction at the same time.

[0008] In the present technical solution, since the locking block has a docking hole that is adapted to the outer shape of the tibial plateau pad column, the docking hole can be docked with the tibial plateau pad column, that is, the locking block is sleeved on the outside of the tibial plateau pad column. Since the shape of the docking hole is adapted to the shape of the tibial plateau pad column, the tightness of the connection between the two can be well guaranteed. The present technical solution designs a matching locking block according to the outer shape of the tibial plateau pad column, so that the tibial plateau pad locking strength test can be more accurately carried out during the locking test; since the tooling block is sleeved on the outside of the locking block and the gap between the two is matched, that is, the tooling block and the locking block adopt a split structural design. Taking into account the test requirements for different models of tibial plateau pads, a variety of locking blocks can be designed, that is, the outer shape of the locking block is matched with the tooling block for installation. There are differences in the shapes of the docking holes in the locking block. When it is necessary to test different types of tibial plateau pads, it is only necessary to replace the locking block, and the tooling block and the tooling handle can be reused, which minimizes the tooling cost and convenience of use. Since the locking block and the tooling block are respectively provided with four threaded holes, the threaded holes on the locking block are internal threaded holes, the internal threaded holes are connected to the docking holes, and the threaded holes on the tooling block are external threaded holes. The angle between the axes of adjacent internal threaded holes is ∠A, and the angle between the axes of adjacent external threaded holes is ∠B, ∠A=90°, ∠B=90°, and one end of the tooling handle is simultaneously threaded with the external threaded hole and the internal threaded hole in the same direction. During the test, the tooling handle can be installed in four different directions, so that the locking strength test in the four directions of front, back, left and right can be realized, thereby meeting ASTM The test complies with the requirements of F1814-2015 "Guidelines for the Assessment of Modular / Modular Hip and Knee Components" and only requires one set of tooling to complete the locking strength test in four directions. There is no need to repeatedly calibrate the reliability of the installation, making the operation simpler and more convenient.

[0009] Furthermore, in order to better achieve the fixed connection between the tooling handle and the tooling block and the locking block, and to further improve the connection strength between the locking block and the tibial plateau pad column, a threaded section is provided on one end of the tooling handle close to the tooling block, and the threaded section is simultaneously threaded with the external threaded hole and the internal threaded hole in the same direction.

[0010] Furthermore, to better secure the tooling handle to the tooling block and locking block, and to further enhance the connection strength between the locking block and the tibial plateau pad post, the length of the threaded section is greater than the sum of the lengths of the external and internal threaded holes in the same direction. During operation, the threaded section can fully extend into the docking hole. Depending on the direction of insertion of the threaded section, the end of the threaded section inserted into the docking hole can be used to tighten against the tibial plateau pad post during testing in different directions, thereby achieving a better locking effect.

[0011] Furthermore, in order to achieve a better locking effect, a nut is threadedly connected to the threaded section, and the nut is located on the outside of the tooling block.

[0012] Furthermore, the locking block adopts 3D printing technology to print the locking block structure.

[0013] In this technical solution, the locking block is printed with 3D resin and can be designed according to different tibial plateau pad column structures. Different products only need to replace different locking blocks, which can realize tibial pad locking experiments of various knee joint products. The purpose of using 3D printing technology is to better lock with the tibial plateau pad column part, and the tooling handle and tooling block are reusable.

[0014] Furthermore, to facilitate the coordinated installation of the locking block and the tooling block, the locking block is a square locking block, and the tooling block is a square tooling block. The square tooling block has a square inner hole, and the locking block is positioned within the square inner hole with a clearance fit between the two. In other words, the design of the square locking block and tooling block not only facilitates the installation of threaded holes in four directions, but also automatically aligns the internal and external threaded holes after the two are docked and installed, eliminating the need for additional debugging operations and making it more convenient to use.

[0015] Furthermore, in order to improve the compactness of the structure, the locking block and the tooling block have the same thickness.

[0016] Furthermore, in order to provide more intuitive feedback on the installation status during the installation process and simplify the structural design, in the use state, the upper end of the locking block is flush with the upper end of the tibial plateau pad column.

[0017] Furthermore, in order to provide more intuitive feedback on the installation status during the installation process and to simplify the structural design, the upper end of the docking hole completely passes through the upper end of the locking block.

[0018] Furthermore, in order to better achieve the fixation of the tibial plateau support, a tibial plateau support tool is also included, and the tibial plateau support tool is filled with dental tray powder or bone cement for fixing the tibial plateau support.

[0019] The beneficial effects of the present invention are as follows: in the present technical solution, since the locking block has a docking hole that is adapted to the outer shape of the tibial plateau pad column, the docking hole can be docked with the tibial plateau pad column, that is, the locking block is sleeved outside the tibial plateau pad column, and since the shape of the docking hole is adapted to the shape of the tibial plateau pad column, the tightness of the connection between the two can be well guaranteed. The present technical solution designs a matching locking block according to the outer shape of the tibial plateau pad column, so that when conducting a locking test, the tibial plateau pad locking strength test can be conducted more accurately; since the tooling block is sleeved on the outside of the locking block and the gap between the two is matched, that is, a split structural design is adopted between the tooling block and the locking block. Taking into account the test requirements for different types of tibial plateau pads, a variety of locking blocks can be designed, that is, the outer shape of the locking block is adapted to the tooling block. Matching installation, there are differences in the shapes of the docking holes in the locking block. When it is necessary to test different types of tibial plateau pads, only the locking block needs to be replaced, and the tooling block and the tooling handle can be reused, which reduces the tooling cost and convenience of use to the greatest extent; since the locking block and the tooling block are respectively provided with four threaded holes, the threaded holes on the locking block are internal threaded holes, the internal threaded holes are connected to the docking holes, and the threaded holes on the tooling block are external threaded holes, the angle between the axes of adjacent internal threaded holes is ∠A, and the angle between the axes of adjacent external threaded holes is ∠B, ∠A=90°, ∠B=90°, one end of the tooling handle is simultaneously threaded with the external threaded hole and the internal threaded hole in the same direction, then during the test, the tooling handle can be installed in four different directions, so that the locking strength test in the four directions of front, back, left and right can be realized, thereby meeting ASTM The test complies with the requirements of F1814-2015 "Guidelines for the Assessment of Modular / Modular Hip and Knee Components" and only requires one set of tooling to complete the locking strength test in four directions. There is no need to repeatedly calibrate the reliability of the installation, making the operation simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the experimental state structure in the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the top view structure of the present invention;

[0023] Figure 4 for Figure 3 AA-axis cross-sectional structural diagram;

[0024] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0025] Figure 6It is a structural schematic diagram of the locking block in the present invention;

[0026] Figure 7 It is a structural schematic diagram of the tooling block in the present invention;

[0027] Figure 8 It is a perspective structural diagram of the locking block in the present invention;

[0028] Figure 9 It is a perspective structural diagram of the tooling block in the present invention.

[0029] In the figure: locking block 1; tooling block 2; tooling handle 3; tibial plateau pad column 4; docking hole 5; internal threaded hole 6; external threaded hole 7; threaded section 8; nut 9; square inner hole 10; tibial plateau support tooling 11; tibial plateau pad 12; tooth base powder 13; tibial plateau support 14. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0031] Example 1:

[0032] like Figures 1-9 As shown, this embodiment provides a tibial pad locking experimental tool, including a locking block 1, a tooling block 2 and a tooling handle 3. The locking block 1 has a docking hole 5 that is adapted to the shape of the tibial plateau pad column 4. The tooling block 2 is sleeved on the outside of the locking block 1 and the two are clearance-fitted. The locking block 1 and the tooling block 2 are respectively provided with four threaded holes. The threaded hole on the locking block 1 is an internal threaded hole 6, which is connected to the docking hole 5. The threaded hole on the tooling block 2 is an external threaded hole 7. The angle between the axes of adjacent internal threaded holes 6 is ∠A, and the angle between the axes of adjacent external threaded holes 7 is ∠B, ∠A=90°, ∠B=90°, and one end of the tooling handle 3 is threadedly fitted with the external threaded hole 7 and the internal threaded hole 6 in the same direction at the same time.

[0033] In the present technical solution, since the locking block 1 has the docking hole 5 adapted to the outer shape of the tibial plateau pad column 4, the docking hole 5 can be docked with the tibial plateau pad column 4, that is, the locking block 1 is sleeved on the outside of the tibial plateau pad column 4. Since the shape of the docking hole 5 is adapted to the shape of the tibial plateau pad column 4, the tightness of the connection between the two can be well guaranteed. The present technical solution designs the matching locking block 1 according to the outer shape of the tibial plateau pad column 4, so that when conducting the locking test, the locking strength test of the tibial plateau pad 12 can be more accurately conducted; since the tooling block 2 is sleeved on the outside of the locking block 1 and the gap between the two is matched, that is, the tooling block 2 and the locking block 1 adopt a split structural design. Taking into account the test requirements for different models of tibial plateau pads 12, a variety of locking blocks 1 can be designed, that is, the external shape of the locking block 1 is matched with the tooling block 2 for installation. There are differences in the shapes of the docking holes 5 in the locking block 1. When it is necessary to test different types of tibial plateau pads 12, it is only necessary to replace the locking block 1, and the tooling block 2 and the tooling handle 3 can be reused, which reduces the tooling cost and convenience of use to the greatest extent; since the locking block 1 and the tooling block 2 are respectively provided with four threaded holes, the threaded hole on the locking block 1 is an internal threaded hole 6, the internal threaded hole 6 is connected to the docking hole 5, and the threaded hole on the tooling block 2 is an external threaded hole 7, the angle between the axes of adjacent internal threaded holes 6 is ∠A, and the angle between the axes of adjacent external threaded holes 7 is ∠B, ∠A=90°, ∠B=90°, one end of the tooling handle 3 is simultaneously threadedly matched with the external threaded hole 7 and the internal threaded hole 6 in the same direction, then during the test, the tooling handle 3 can be installed in four different directions, so that the locking strength test in the four directions of front, back, left and right can be realized, thereby meeting ASTM The test complies with the requirements of F1814-2015 "Guidelines for the Assessment of Modular / Modular Hip and Knee Components" and only requires one set of tooling to complete the locking strength test in four directions. There is no need to repeatedly calibrate the reliability of the installation, making the operation simpler and more convenient.

[0034] Example 2:

[0035] This embodiment is optimized based on the above embodiment 1.

[0036] In order to better realize the fixed connection between the tooling handle 3 and the tooling block 2 and the locking block 1, and further improve the connection strength between the locking block 1 and the tibial plateau pad column 4, a threaded section 8 is provided on the end of the tooling handle 3 close to the tooling block 2, and the threaded section 8 is simultaneously threadedly matched with the external threaded hole 7 and the internal threaded hole 6 in the same direction.

[0037] Example 3:

[0038] This embodiment is optimized based on the above embodiment 2.

[0039] To better securely connect tooling shank 3 to tooling block 2 and locking block 1, and to further enhance the connection strength between locking block 1 and tibial plateau pad post 4, the length of threaded segment 8 is greater than the sum of the lengths of externally threaded hole 7 and internally threaded hole 6 in the same direction. During operation, threaded segment 8 can fully extend into docking hole 5. Depending on the direction of insertion of threaded segment 8, the end of threaded segment 8 inserted into docking hole 5 can be used to tighten against tibial plateau pad post 4, achieving a better locking effect during various tests.

[0040] Example 4:

[0041] This embodiment is optimized based on the above embodiment 2.

[0042] In order to achieve a better locking effect, a nut 9 is threadedly connected to the threaded section 8 , and the nut 9 is located outside the tooling block 2 .

[0043] Example 5:

[0044] This embodiment is optimized based on the above embodiment 1.

[0045] The locking block 1 is printed using 3D printing technology.

[0046] In this technical solution, the locking block 1 is printed with 3D resin and can be designed according to the structure of different tibial plateau pad columns 4. Different products only need to replace different locking blocks 1, and tibial pad locking experiments of various knee joint products can be realized. The purpose of using 3D printing technology is to better lock with the tibial plateau pad column 4. The tooling handle 3 and tooling block 2 can be reused.

[0047] Example 6:

[0048] This embodiment is optimized based on the above embodiment 1.

[0049] To facilitate the coordinated installation of locking block 1 and tooling block 2, locking block 1 is square, and tooling block 2 is square. The square tooling block has a square inner hole 10, with locking block 1 positioned within square inner hole 10, with a clearance fit between the two. This design not only facilitates the provision of threaded holes in all four directions, but also automatically aligns the internally threaded hole 6 with the externally threaded hole 7 after the two are docked and installed, eliminating the need for additional commissioning and enhancing ease of use.

[0050] Example 7:

[0051] This embodiment is optimized based on the above embodiment 1.

[0052] In order to improve the compactness of the structure, the locking block 1 and the tooling block 2 have the same thickness.

[0053] Example 8:

[0054] This embodiment is optimized based on the above embodiment 1.

[0055] In order to provide more intuitive feedback on the installation status during the installation process and simplify the structural design, in the use state, the upper end of the locking block 1 is flush with the upper end of the tibial plateau pad column 4.

[0056] Example 9:

[0057] This embodiment is optimized based on the above embodiment 1.

[0058] In order to provide more intuitive feedback on the installation status during the installation process and to simplify the structural design, the upper end of the docking hole 5 completely passes through the upper end of the locking block 1 .

[0059] Example 10:

[0060] This embodiment is optimized based on the above embodiment 1.

[0061] In order to better fix the tibial plateau tray 14, a tibial plateau tray tool 11 is also included. The tibial plateau tray tool 11 is filled with tray powder 13 or bone cement for fixing the tibial plateau tray 14. The tibial plateau tray tool 11 is reusable.

[0062] It should be noted that the dental tray powder 13 can also be replaced by bone cement, which can also achieve a good fixation effect. Since bone cement is expensive, the dental tray powder 13 is preferably selected.

[0063] In order to facilitate installation and fixation in matching with the fixture of the testing machine, the tooling handle 3 is a cylindrical tooling handle 3.

[0064] Since the stress of the knee joint prosthesis is more concentrated on the column during movement and flexion, the column is the most important stress point of the tibial plateau, and the shear force in all directions borne by the tibial plateau is also centered on the column. Therefore, the test of the locking strength of the tibial pad is to apply load with the column as the center for testing. The present invention designs the locking block 1 structure according to the shape of the tibial plateau pad column 4, and adopts 3D printing technology for resin printing. When using this tooling, the locking block 1 can be locked with the tibial plateau pad 12, and the external tooling block 2 cooperates with it, and then the tooling handle 3 is installed for assembly. The tooling block 2 is designed to be detachable, so that the locking strength test of the product in four directions can be carried out.

[0065] The specific experimental steps are as follows: use tooth tray powder 13 to fix the test tibial plateau tray 14 in the tibial plateau tray fixture 11, and the tibial plateau tray fixture 11 is fixed with the fixture of the testing machine. According to the product use requirements, the tibial plateau pad 12 is installed on the tibial plateau tray 14. The fixture handle 3 is fixed with the fixture of the testing machine, and the electronic universal machine is controlled by a microcomputer. After the product is locked according to the sample fixing and loading method, a static connection test is carried out, and the load is applied at the crossbeam displacement rate in the testing machine. Specifically, the load is applied at a crossbeam displacement rate of (0.04±0.01) mm / s. The test is stopped when the tibial plateau pad 12 is completely separated from the tibial plateau tray 14 or the tibial plateau pad 12 fails. Finally, the maximum force F and the load-corresponding displacement curve are recorded to complete the experiment.

[0066] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A tibial liner locking test tool, characterized by: It includes a locking block, a tooling block and a tooling handle, the locking block has a docking hole adapted to the shape of the tibial plateau pad column, the tooling block is sleeved on the outside of the locking block and the two are clearance-matched, the locking block and the tooling block are respectively provided with four threaded holes, the threaded holes on the locking block are internally threaded holes, the internally threaded holes are connected to the docking holes, the threaded holes on the tooling block are externally threaded holes, the angle between the axes of adjacent internally threaded holes is ∠A, the angle between the axes of adjacent externally threaded holes is ∠B, ∠A=90°, ∠B=90°, and one end of the tooling handle is simultaneously threadedly matched with the externally threaded hole and the internally threaded hole in the same direction; A threaded section is provided on one end of the tooling handle close to the tooling block, and the threaded section is threadedly engaged with the external threaded hole and the internal threaded hole in the same direction; The length of the threaded section is greater than the sum of the lengths of the external threaded hole and the internal threaded hole in the same direction.

2. The tibial liner locking test tool according to claim 1, characterized in that: The threaded section is threadedly connected with a nut, and the nut is located outside the tooling block.

3. The tibial liner locking test tool according to claim 1, characterized in that: The locking block adopts 3D printing technology to print the locking block structure.

4. The tibial liner locking test tool according to claim 1, characterized in that: The locking block is a square locking block, the tooling block is a square tooling block, the square tooling block has a square inner hole, the locking block is located in the square inner hole, and the two are clearance-fitted.

5. The tibial liner locking test tool according to claim 1, characterized in that: The locking block and the tooling block have the same thickness.

6. The tibial liner locking test tool according to claim 1, characterized in that: In use, the upper end of the locking block is flush with the upper end of the tibial plateau pad column.

7. The tibial liner locking test tool according to claim 1, characterized in that: The upper end of the docking hole completely passes through the upper end of the locking block.

8. The tibial liner locking test tool according to claim 1, characterized in that: It also includes a tibial plateau support tool, which is filled with dental tray powder or bone cement for fixing the tibial plateau support.

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