Intervertebral disc specimen biomechanical testing device

Abstract

The utility model discloses an intervertebral disc specimen biomechanical testing device which comprises a support and a workbench arranged on the upper end face of the support and capable of rotating or translating, a mounting cavity capable of embedding a spine sample is arranged in the workbench, and a loading device used for simulating various stress conditions of the spine is further arranged on the upper end face of the support. The loading device comprises a first stand column part and a second stand column part which are arranged on the two sides of the working table respectively, and a rotating device is arranged between the first stand column part and the second stand column part, so that multi-degree-of-freedom force loading can be realized, various stress conditions of the spine can be simulated, and the invalidation mechanism of the intervertebral disc can be better researched under different load conditions; the intervertebral disc injury and degeneration experimental device can be used for scientific research in the aspects of simulating or exploring a biomechanical mechanism of intervertebral disc injury and degeneration, constructing an intervertebral disc injury and degeneration in-vitro model and the like, and belongs to the technical field of biomechanical tests.

Description

Technical Field

[0001] This utility model belongs to the field of biomechanical testing technology, and more specifically relates to a biomechanical testing device for intervertebral disc specimens. Background Technology

[0002] The prevalence of intervertebral disc prolapse increases with age, affecting 1-3% of the population, with the highest incidence in the 30-60 age group. The incidence is highest in the lower lumbar or lumbosacral spine, exceeding 90%. This region bears a high biomechanical load, which may be a contributing factor to the development of intervertebral disc prolapse.

[0003] It is hypothesized that lifting heavy objects and extreme postures can cause minor injuries, starting from the inner side of the nasal ring or the outer side near the endplate. This damage accumulates over many years until the structure weakens, and a final loading event causes the last few intact discs to fail suddenly. To investigate the failure mechanism of the intervertebral disc, its biomechanical properties need to be tested accordingly. Studies have shown that loading rate and complex loading conditions significantly influence the failure mode of the intervertebral disc.

[0004] Load rate and complex load conditions have a significant impact on the failure mode of intervertebral discs. Traditional testing devices cannot simulate all the stress conditions of the intervertebral discs; they can only simulate dynamic loads with 2 degrees of freedom and 3 static loads, which cannot accurately reflect the stress conditions of the intervertebral discs. Utility Model Content

[0005] The main objective of this invention is to provide a biomechanical testing device for intervertebral disc specimens that can achieve multi-degree-of-freedom force loading to simulate various stress conditions of the spine.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A biomechanical testing device for intervertebral disc specimens includes a support and a worktable that can rotate or translate, disposed on the upper surface of the support. The worktable has an installation cavity for embedding a spinal sample. The upper surface of the support is also provided with a loading device for simulating various stress conditions of the spine. The loading device includes a first column and a second column disposed on both sides of the worktable. A rotary device is provided between the first column and the second column, and the output end of the rotary device can be aligned with the position of the installation cavity.

[0008] According to a first aspect of the present invention, the upper end face of the bracket is further provided with a path sensor, which is located between the first column and the worktable.

[0009] According to a first aspect of the present invention, the workbench includes a base and a six-component weighing sensor disposed above the base. Above the six-component weighing sensor is a force-bearing plate that can be connected to the output end of the rotary device. The mounting cavity is located between the six-component weighing sensor and the force-bearing plate.

[0010] According to a first aspect of the present invention, the loading device further includes a horizontally arranged connecting rod and a crank for adjusting the height of the connecting rod, the connecting rod being located between the top of the first column portion and the top of the second column portion, and the crank being located at the top of the second column portion.

[0011] According to a first aspect of the present invention, the first column portion includes a first column fixedly connected to the upper end face of the bracket and a first crossbeam perpendicular to the first column, wherein a first clamping block is provided on the side of the first crossbeam near the rotary device.

[0012] According to a first aspect of the present invention, the second column portion includes a second column fixedly connected to the upper end face of the bracket and a second crossbeam perpendicular to the second column, wherein a second clamping block is provided on the side of the second crossbeam near the rotary device.

[0013] According to a first aspect of the present invention, a counterweight block is provided on the outer side of the second clamping block.

[0014] According to a first aspect of the present invention, the lower end face of the bracket is provided with a driving assembly, the driving assembly includes at least three drive motors arranged at intervals, the driving assembly can be connected to the worktable, the first column and the rotary device respectively, and the worktable can be rotated or translated by the driving assembly.

[0015] According to a first aspect of the present invention, four legs are provided perpendicular to the four corners of the bracket, and a rubber seat is provided at the other end of each leg. A reinforcing rod is provided between adjacent legs.

[0016] One of the above-described technical solutions of this utility model has at least one of the following advantages or beneficial effects:

[0017] This invention utilizes a worktable that can rotate or translate on the upper surface of a support, and a loading device and a rotary device that corresponds to the mounting cavity to achieve multi-degree-of-freedom force loading, thereby simulating various stress conditions of the spine. Under different load conditions, it can better study the failure mechanism of the intervertebral disc, and further simulate or explore the biomechanical mechanism of intervertebral disc injury and degeneration, and construct an external model of intervertebral disc injury and degeneration, etc., for scientific research. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Appendix Figure 1 This is an overall structural diagram of one embodiment of the present utility model.

[0020] Appendix Figure 2 This is a front view of one embodiment of the present invention.

[0021] Appendix Figure 3 This is a side view of one embodiment of the present invention.

[0022] Appendix Figure 4 This is a schematic diagram of the workbench portion of one embodiment of the present invention. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in 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 utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "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. If "first" or "second" is used in the description, it is only for the purpose of 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.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection or a connection that can communicate with each other; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements, an indirect connection, or an interaction between two elements.

[0028] The following disclosure provides many different implementation methods or examples for different solutions to implement this utility model.

[0029] See attached document Figure 1 To be continued Figure 4 As shown, a biomechanical testing device for intervertebral disc specimens includes a support 1, a worktable 2 set on the upper surface of the support 1, a loading device for simulating various stress conditions of the spine, and a rotation device 5. Support legs 12 are respectively provided at the four corners perpendicular to the support 1, and a rubber seat is provided at the other end of each support leg 12. Reinforcing rods are provided between adjacent support legs 12 to ensure the overall stability.

[0030] In one embodiment of this utility model, the loading device is disposed on the upper end face of the support 1. The loading device includes a first column part 3 and a second column part 4 disposed on both sides of the worktable 2. By disposing of a driving assembly 11 on the lower end face of the support 1, the driving assembly 11 includes three drive motors disposed at intervals. The three drive motors are respectively connected to the worktable 2, the first column part 3 and the rotary device 5, thereby enabling the worktable 2 to rotate or translate.

[0031] In one embodiment of this utility model, the workbench 2 has an internal mounting cavity for embedding a spinal sample, as shown in the attached drawing. Figure 4 The workbench 2 includes a base 21 and a six-component weighing sensor 22 disposed above the base 21. Above the six-component weighing sensor 22 is a force plate 23 that can be connected to the output end of the rotary device 5. The mounting cavity is located between the six-component weighing sensor 22 and the force plate 23.

[0032] For details, please refer to the attached document. Figure 4 The movement of the crosshead in section 2 of the worktable around the Y-axis produces bending or extension, which is directly driven. Oscillation is achieved by the movement of the lever arm, which is connected to the drive shaft of the corresponding drive motor via a universal joint. Axial rotation of worktable 2 is directly driven by the drive motor. Lateral bending in the X-axis direction and translation in the Y-axis direction of worktable 2 are coupled to the corresponding drive shafts via the lever arm. Translation in the Z-axis direction is driven by the drive shaft, and all translational movements of worktable 2 are guided by linear bearings.

[0033] In one embodiment of this invention, a rotating device 5 is provided between the first column 3 and the second column 4, and a laser path sensor 6 is provided on the upper end face of the support 1. The path sensor 6 is positioned between the first column 3 and the worktable 2 to ensure that the output end of the rotating device 5 corresponds to the position of the mounting cavity, thereby enabling the application of complex motion combinations and allowing the creation of artificial lesions in the intervertebral disc using complex loading procedures at the mounting cavity. Further testing aims to better understand the mechanism of intervertebral disc failure at the microstructural level under different load conditions.

[0034] In one embodiment of this utility model, the first column part 3 includes a first column 31 fixedly connected to the upper end face of the bracket 1 and a first crossbeam 32 arranged perpendicular to the first column 31. The first crossbeam 32 is provided with a first clamping block 33 on the side near the rotating device 5. The second column part 4 includes a second column 41 fixedly connected to the upper end face of the bracket 1 and a second crossbeam 42 arranged perpendicular to the second column 41. The second crossbeam 42 is provided with a second clamping block 43 on the side near the rotating device 5. In use, the first clamping block 33 and the second clamping block 43 are guided by the first column 31 and the second column 41 and are rigidly fixed on the base plate installed on the upper end face of the bracket 1.

[0035] In one embodiment of this utility model, the first column 3 and the second column 4 are provided with horizontally arranged connecting rods 7, and the top of the second column 4 is provided with a crank 71 for adjusting the height of the connecting rods 7. The connecting rods 7 are located between the tops of the first column 3 and the second column 4. The worktable 2 can generate independent translation along each of the three axes and provide the final rotational degree of freedom, including six degrees of freedom of pure load: buckling / extension, lateral bending, axial rotation, lateral outer shear force, front and rear shear force, and axial compression / decompression.

[0036] In one embodiment of this utility model, an additional drive motor may be provided laterally on the side of the first crossbeam 32 away from the rotating device 5, and a counterweight may be provided on the outside of the second clamping block 43 to balance the buckling / extension axis.

[0037] This intervertebral disc specimen biomechanical testing device can simulate various stress conditions of the spine, better study the failure mechanism of the intervertebral disc under different load conditions, and can be used for scientific research such as simulating or exploring the biomechanical mechanism of intervertebral disc injury and degeneration, and constructing external models of intervertebral disc injury and degeneration.

[0038] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A biomechanical testing device for intervertebral disc specimens, characterized in that, The device includes a support (1) and a worktable (2) that can rotate or translate, provided on the upper surface of the support (1). The worktable (2) has an installation cavity inside which a spinal sample can be embedded. The upper surface of the support (1) is also provided with a loading device for simulating various stress conditions of the spine. The loading device includes a first column (3) and a second column (4) respectively provided on both sides of the worktable (2). A rotary device (5) is provided between the first column (3) and the second column (4). The output end of the rotary device (5) can be aligned with the position of the installation cavity.

2. The intervertebral disc specimen biomechanical testing device according to claim 1, characterized in that: The upper end face of the bracket (1) is also provided with a path sensor (6), which is located between the first column (3) and the workbench (2).

3. The intervertebral disc specimen biomechanical testing device according to claim 1, characterized in that: The workbench (2) includes a base (21) and a six-component weighing sensor (22) disposed above the base (21). Above the six-component weighing sensor (22) is a force plate (23) that can be connected to the output end of the rotary device (5). The mounting cavity is located between the six-component weighing sensor (22) and the force plate (23).

4. The intervertebral disc specimen biomechanical testing device according to claim 1, characterized in that: The loading device also includes a horizontally arranged connecting rod (7) and a crank (71) for adjusting the height of the connecting rod (7). The connecting rod (7) is located between the top of the first column (3) and the second column (4), and the crank (71) is located at the top of the second column (4).

5. The intervertebral disc specimen biomechanical testing device according to claim 1, characterized in that: The first column part (3) includes a first column (31) fixedly connected to the upper end face of the bracket (1) and a first crossbeam (32) perpendicular to the first column (31). The first crossbeam (32) is provided with a first clamping block (33) on the side near the rotary device (5).

6. The intervertebral disc specimen biomechanical testing device according to claim 5, characterized in that: The second column part (4) includes a second column (41) fixedly connected to the upper end face of the bracket (1) and a second crossbeam (42) perpendicular to the second column (41). The second crossbeam (42) has a second clamping block (43) on the side near the rotary device (5).

7. The intervertebral disc specimen biomechanical testing device according to claim 6, characterized in that: The second clamping block (43) has a counterweight on its outer side.

8. The intervertebral disc specimen biomechanical testing device according to claim 1, characterized in that: The lower end face of the bracket (1) is provided with a drive assembly (11), which includes at least three drive motors spaced apart. The drive assembly (11) can be connected to the worktable (2), the first column (3) and the rotary device (5) respectively. The worktable (2) can be rotated or translated by the drive assembly (11).

9. The intervertebral disc specimen biomechanical testing device according to claim 8, characterized in that: Each of the four corners of the support (1) is provided with a support leg (12), and the other end of each support leg (12) is provided with a rubber seat. A reinforcing rod is provided between adjacent support legs (12).

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