A fatigue test device for a flexible artificial intervertebral disc prosthesis

Abstract

The present invention discloses a fatigue test device for a flexible artificial disc prosthesis, which relates to the technical field of fatigue testing of biological prostheses and includes a frame, a driving module, a first transmission module, and a second transmission module. The first transmission module is a sliding member composed of two slide rails; the second transmission module includes a second slider and a connecting rod; based on the change of the connection on the two connection sides of the second slider and the second slide rail, the device is switched to a torsion test mode and a bending test mode; by simply changing the installation method of the assembly composed of the connecting rod and the slider connected to the test fixture, the change of the test mode can be realized, without the need for complex design of the transmission components to simultaneously meet the requirements of transmission and assisting the change of the test mode; at the same time, a guide rail is used as the transmission part, which has a simple structure and better stability and accuracy. In addition, the problem of inconsistent reciprocating speeds in the existing test technology caused by using a crank-slider mechanism as the rotating part of the device is also solved.

Description

Technical Field

[0001] The present invention relates to the field of biomechanical fatigue testing devices for prostheses, and more particularly to a fatigue testing device for a flexible artificial intervertebral disc prosthesis. Background Art

[0002] Intervertebral disc lesions, degeneration or injuries are the main causes of cervical spondylosis. For relatively severe conditions, due to the low biological repair and regeneration ability of the intervertebral tissue, artificial disc replacement has become the main approach for late treatment. As the main component in this treatment method, corresponding fatigue testing of the intervertebral disc prosthesis is an important link to ensure whether the patient can live normally after surgery.

[0003] The invention patent with the publication number CN115389340A discloses a spinal biomechanics and mobility testing device, which includes fixtures arranged at both ends of the spine to be tested, and adjustment mechanisms for realizing six-degree-of-freedom movement are provided on the fixtures. However, the following problems exist in this invention:

[0004] (1) To achieve the multi-degree-of-freedom movement of the fixture, the transmission components near the test fixture need to assist the test fixture in changing the movement mode, resulting in a complex structure of the transmission components.

[0005] (2) The main transmission components of the device are connected in a rotational manner. After long-term use, due to problems such as inertia and dynamic balance during use, the cooperation performance between the rotating components decreases, and the transmission stability and accuracy of the device decrease.

[0006] CN112557222A discloses a fatigue testing method and device for a polyetheretherketone artificial spinal fusion cage, which realizes compression and torsional fatigue tests of the sample through a crank-slider mechanism, a gear transmission, and an electric fork. However, the crank-slider mechanism adopted in this invention has a "quick return" characteristic, that is, the reciprocating speeds are inconsistent, resulting in the problem that the experimental working conditions are inconsistent with the actual working conditions. Summary of the Invention

[0007] The object of the present invention is to provide a fatigue testing device for a flexible artificial intervertebral disc prosthesis, so as to solve the problem that in the existing intervertebral disc prosthesis fatigue testing device, in order to achieve the multi-degree-of-freedom movement of the fixture, the transmission components near the test fixture need to assist the test fixture in changing the movement mode, resulting in a complex transmission structure in the device, and the problem that the transmission components connected in a rotational manner are prone to cause a decrease in the transmission stability and accuracy of the device after long-term use. At the same time, it also solves the problem of inconsistent test reciprocating speeds caused by the crank-slider mechanism in the existing test technology.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A fatigue test device for a flexible artificial intervertebral disc prosthesis, characterized by comprising: a frame, a driving module, a first transmission module and a second transmission module, wherein the first transmission module includes a first slide rail and a second slide rail, the first slide rail is slidably connected to the second slide rail, and the driving module is used to drive the first slide rail to slide;

[0010] The second transmission module includes a second slider and a connecting rod, the second slider is rotatably connected to the second slide rail and slidably connected to the connecting rod; the second transmission module includes a second slider and a connecting rod, the second slider is rotatably connected to the second slide rail and slidably connected to the connecting rod; one end of the second slide rail close to the second transmission module is provided with a horizontal connection side and a vertical connection side. When the second slider is rotatably connected to the horizontal connection side, the second transmission module is used for torsion testing. When the second slider is rotatably connected to the vertical connection side, the second transmission module is used for bending testing, and a specimen clamping device is arranged at the end of the connecting rod.

[0011] In the existing fatigue test device for intervertebral disc prosthesis, in order to realize the multi-degree-of-freedom movement of the fixture, the transmission components need to assist the fixture for testing to change the movement mode, resulting in a complex transmission structure in the device. At the same time, after long-term use, the transmission components connected by rotation are likely to cause the decline of the transmission stability and accuracy of the device; the fatigue test device for a flexible artificial intervertebral disc prosthesis provided by the present invention can realize the change of the test mode only by simply changing the installation method of the assembly composed of the connecting rod and the slider connected to the test fixture, without the need for complex design of the transmission components to simultaneously meet the requirements of transmission and assisting the change of the test mode; at the same time, the main transmission device of the present invention adopts a slider-rail mechanism based on a sliding connection form. Compared with the existing fatigue test device for intervertebral disc prosthesis that relies on rotational connection for transmission, the guide rail only needs to make a translational movement in the horizontal linear direction, without considering the complex dynamic balance problem caused by rotational connection and the problem of the decline of the cooperation performance between rotational components after long-term use. The structure is simple and has better stability and accuracy. In addition, the problem of inconsistent reciprocating speed in the existing test technology caused by using a crank-slider mechanism as the rotational mechanism is also solved.

[0012] Further, the driving module includes a motor and a disc driven by the motor. The first transmission module further includes a first slider. The first slide rail and the second slide rail are perpendicularly arranged on a horizontal plane. The first slider is slidably connected to the second slide rail and connected to the disc. The number of the second slide rails is two and they are symmetrically distributed about the disc in the horizontal direction.

[0013] Use a disc to provide transmission, making the transmission more stable. At the same time, by symmetrically arranging two second sliding rails, the moving stability of the first sliding rail that slides in the first transmission module is enhanced, thereby ensuring the stability of the transmission.

[0014] Furthermore, the testing device further includes a thermostatic and humidistatic chamber for simulating the physiological environment of the sample. The frame includes a support member and a horizontal platform fixedly connected to the support member. The thermostatic and humidistatic chamber and the driving module are respectively arranged on the left and right sides of the support member. The driving module and the thermostatic and humidistatic chamber are both located below the first transmission module, and the sample clamping device is located in the thermostatic and humidistatic chamber.

[0015] For the fatigue testing of components such as intervertebral disc prostheses, the component to be tested needs to be placed in a simulated physiological environment to obtain more accurate test results. By adding a thermostatic and humidistatic chamber and placing the clamping device therein, the purpose of simulating the physiological environment of the sample to be tested is achieved during the test. At the same time, the driving device, the transmission device, and the thermostatic and humidistatic chamber are set in a mutually separated form and a rod-shaped connecting shaft is used to connect the sample clamping device, ensuring that the device structure immersed in the thermostatic and humidistatic chamber is small, reducing the erosion effect of water and electrolytes on the device, and thereby improving the overall service life of the device.

[0016] Furthermore, the connecting rod is cylindrical.

[0017] By designing the connecting rod to be cylindrical, compared with rods of other shapes, the disturbance to the liquid test environment in the thermostatic and humidistatic chamber is smaller, thereby making the test influencing factors fewer and the test results more accurate.

[0018] Furthermore, a circular hole is opened on the horizontal platform. The sample clamping device of the second transmission module for torsional testing includes a connecting end, a supporting end, and a clamping end for fixing the sample. The connecting end is fixedly connected to the connecting rod. The connecting end, the supporting end, and the clamping end are arranged vertically in sequence from top to bottom. The supporting end is rotatably connected to the circular hole through a rolling bearing.

[0019] When performing torsional testing on the sample, when the sample is stressed and twisted, if there is no supporting component on the connecting rod, the reaction force generated by the sample easily causes the connecting rod to shift in all directions. By installing a rolling bearing on the connecting rod, the stability of the connecting rod during rotational testing is enhanced, avoiding the situation where the connecting rod shifts in all directions, thereby affecting the test results.

[0020] Furthermore, the frame further includes a base. The upper surface of the base is fixedly connected to the thermostatic and humidistatic chamber through a number of uniformly distributed support rods. After connection, there is a gap between the thermostatic and humidistatic chamber and the support member.

[0021] The mechanical vibrations generated by the driving component and the transmission component will cause certain disturbances to the simulated physiological environment in the thermostatic and humidistatic chamber, thereby affecting the test results. By designing the thermostatic and humidistatic chamber to be connected to the frame base only through the support rod, the coupling with other mechanical components in the device is reduced, the mechanical vibrations transmitted to the thermostatic and humidistatic chamber are lowered, and the accuracy of the test results is further improved.

[0022] Further, the second slider includes a first connecting plate and a second connecting plate that is perpendicular to and fixedly connected to the first connecting plate. The first connecting plate and the second connecting plate are respectively provided with a first through hole and a second through hole. The first connecting plate is slidably connected to the connecting rod based on the first through hole, and the second connecting plate is rotatably connected to the second slide rail based on the second through hole.

[0023] After the first transmission module and the second transmission module are coupled, the transmission component needs to change the movement direction. Conventional means use mutually perpendicular gears for transmission. In the present invention, by using a right-angled slider as the connecting intermediate for changing the movement direction, while having greater structural strength, compared with the method that requires two gears, the right-angled slider is an integral structure and is more convenient to disassemble and assemble when the test mode is changed.

[0024] Further, a plurality of pin holes are formed on the surface of the disc, and the first slider is detachably connected to the pin holes.

[0025] By providing a plurality of pin holes and connecting the first slider to the disc through the pin holes, the rotation amplitudes during bending and torsion can be changed only by adjusting the mechanical structure, and the test of the established rotation amplitude can be realized without additional sensing devices or control systems, making the overall structure of the device more concise and the cost lower. At the same time, the disc opening can be designed according to actual needs to meet the requirements of the large deformation fatigue test of the flexible artificial intervertebral disc prosthesis.

[0026] Further, the horizontal platform is provided with a slot-shaped hole, and the connecting rod of the second transmission module for bending test is slidably connected to the slot-shaped hole, and the diameter of the connecting rod of the second transmission module for bending test matches the width of the slot-shaped hole.

[0027] During the bending test, if there is no supporting device for the connecting rod, there will also be a problem that the connecting rod will shift during the test process and affect the test results. By providing the slot-shaped hole and allowing the connecting rod to be slidably connected to the slot-shaped hole, the connecting rod will not shift to both sides due to the limitation of the slot-shaped hole during the bending test, thereby ensuring the accuracy of the test results.

[0028] Further, the driving module further includes a torque sensor connected to the output shaft of the motor, and the frame is fixedly connected with a photoelectric counter for recording the reciprocating times of the connecting rod.

[0029] To make the test results of the device more accurate, it is generally necessary to set up corresponding sensors to obtain test data. By adding a torque sensor, it is ensured that the device operates normally within the designed torque range, and it can also help detect whether there are abnormal loads or faults in the device. The photoelectric counter is used for counting to facilitate obtaining the corresponding fatigue parameters for subsequent data processing and analysis.

[0030] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0031] (1) For the flexible artificial disc prosthesis fatigue test device provided by the present invention, by simply changing the installation method of the assembly composed of the connecting rod and the slider connected to the test fixture, the change of the test mode can be achieved, without the need for complex design of the transmission components to simultaneously meet the requirements of transmission and assisting the change of the test mode;

[0032] (2) For the flexible artificial disc prosthesis fatigue test device provided by the present invention, since the main transmission device adopts a slider-rail mechanism based on a sliding connection form, compared with the existing disc prosthesis fatigue test device relying on rotational connection for transmission, the guide rail only needs to perform translational motion in the horizontal straight line direction, without considering the complex dynamic balance problem caused by rotational connection and the problem of the decline in the cooperation performance between rotational components after long-term use. The structure is simple and has better stability and accuracy;

[0033] (3) For the flexible artificial disc prosthesis fatigue test device provided by the present invention, by adding a constant temperature and humidity chamber and placing the clamping device therein, the purpose of simulating the physiological environment of the sample to be tested can be achieved during the test. At the same time, the driving device, the transmission device, and the constant temperature and humidity chamber are set in a mutually separated form and a rod-shaped connecting shaft is used to connect the sample clamping device, ensuring that the structure of the device immersed in the constant temperature and humidity chamber is small, reducing the erosion of water and electrolytes on the device, and thus improving the overall service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of the present invention, and do not constitute a limitation to the embodiments of the present invention;

[0035] Figure 1 is a schematic structural diagram of the flexible artificial disc prosthesis fatigue test device for torsional test in the present invention;

[0036] Figure 2 is Figure 1 a schematic structural diagram of the second transmission module in

[0037] Figure 3It is a schematic structural diagram of a fatigue test device for a flexible artificial disc prosthesis used in the bending test of the present invention;

[0038] Figure 4 is Figure 3 a schematic structural diagram of the second transmission module in;

[0039] Among them, 1 - frame, 101 - support member, 102 - horizontal platform, 2 - drive module, 201 - motor, 202 - torque sensor, 203 - disc, 3 - thermostatic and humidistatic chamber, 4 - first transmission module, 401 - first slider, 402 - first slide rail, 403 - second slide rail, 5 - second transmission module, 501 - second slider, 502 - connecting rod, 503 - connecting flange, 504 - torsion end connecting block, 505 - torsion mode connecting block, 506 - bending mode connecting block, 6 - specimen clamping device, 601 - lower clamping part, 602 - supporting part, 7 - photoelectric counter. Detailed implementation manners

[0040] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0041] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described within the scope hereof. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0042] Embodiment 1

[0043] Please refer to Figures 1 - 4 , a fatigue test device for a flexible artificial disc prosthesis provided by an embodiment of the present invention includes a frame 1, a drive module 2, a first transmission module 4 and a second transmission module 5. The frame 1 serves as the overall structural support of the test device and is designed according to actual working conditions. The material can be metal or plastic. The drive module 2 includes a motor and a disc 203 driven by the motor 201. The motor 201 can be a servo motor or a stepper motor. The disc 203 can be connected to the frame 1 through a rolling bearing to improve the stability of the disc 203. The first transmission module 4 includes a first slider 401, a first slide rail 402 and a second slide rail 403. Specifically, as Figure 1As shown in the figure, the second slide rail 403 is fixedly connected to the frame 1. The fixed connection can be welding or threaded connection. The first slide rail 403 and the second slide rail 402 are vertically arranged on the horizontal plane. The end of the first slide rail 402 is slidably connected to the first slide rail. At the same time, a first slider 401 is also slidably connected to the first slide rail 402. The bottom of the first slider 401 is fixedly connected to the upper surface of the disc 203. The rotation of the disc drives the sliding of the first slider 401, thereby causing the first slide rail 402 to move along the second slide rail 403. The second transmission module 5 includes a second slider 501 and a connecting rod 502. The second slider 501 is rotatably connected to the second slide rail 403 and slidably connected to the connecting rod 502. Among them, the number of the second slide rails 403 can be two and symmetrically distributed about the disc in the horizontal direction to enhance the moving stability of the first slide rail 402. The second transmission module is detachably connected to the first transmission module. According to different connection methods, the switching between the bending test and the torsion test of the device can be realized. The second slider 501 can be cylindrical or cubic. As a preferred solution, the second slider 501 is right-angled. The two right-angled sides are the first connecting plate and the second connecting plate respectively, and the two connecting plates are respectively provided with a first through hole and a second through hole. The first connecting plate is slidably connected to the connecting rod 502 based on the first through hole, and the second connecting plate is rotatably connected to the second slide rail 403 based on the second through hole. By using a right-angled slider as the connecting intermediate piece for changing the movement direction, while having greater structural strength, compared with the method requiring two gears, this right-angled slider is an integral structure and is more convenient to disassemble and assemble when changing the test mode, such as Figure 2 and Figure 3 As shown in the figure, the second slider 501 is rotatably connected to two different connecting sides of the first slide rail 402 to achieve different test functions. The rotational connection can be a direct connection or a connection through an intermediate piece. Exemplarily, a columnar torsion mode connection block 505 is rotatably connected to the second through hole of the second connecting plate on the right-angled slider. At this time, it is the torsion test mode. When the bending mode connection block 506 is rotatably connected to the second through hole of the second connecting plate on the right-angled slider, it is the bending test mode at this time.

[0044] When testing, the motor drives the disc 203 to rotate. The first slider 401 rotates together with the disc 203, thereby driving the first slide rail 402 to move along the second slide rail 403 and be able to make a reciprocating motion with the rotation of the disc. Under the bending test, the connecting rod of the second transmission module makes a pendulum motion, thereby realizing the bending test. Under the torsion test, the connecting rod of the second transmission module rotates around its own axis, thereby realizing the torsion test. A sample clamping device 6 is provided at the end of the connecting rod. Exemplarily, such as Figure 1As shown, the specimen clamping device 6 includes two fixed parts that are vertically distributed and separated from each other, and a supporting part 602 connected to the frame 1. The supporting part is used to fixedly connect the lower clamping part 601 to ensure the normal operation of the test. The clamping device can be a flexible hinge test device or an ordinary concave clamping device with a fixing function.

[0045] The motor output shaft is also provided with a torque sensor 202 to ensure the normal operation of the device within the designed torque range, and can also help detect whether there is abnormal load or fault in the device. It can also be connected to the control system to achieve automated testing. In addition, the frame 1 is fixedly connected with a photoconductive counter 7 for recording the reciprocating times of the connecting rod, which is convenient for obtaining the corresponding fatigue parameters for subsequent data processing and analysis.

[0046] As a preferred solution, a number of pin holes are formed on the surface of the disc 203, and the first slider 401 is detachably connected to the pin holes. By providing a number of pin holes and connecting the first slider to the disc through the pin holes, the rotation amplitude during bending and torsion can be changed only by adjusting the mechanical structure, and the test of the established rotation amplitude can be achieved without additional sensing devices or control systems, making the overall structure of the device more concise and the cost lower.

[0047] The flexible artificial disc prosthesis fatigue test device provided in this embodiment further includes a thermostatic and humidistatic chamber 3 for simulating the physiological environment of the specimen. The thermostatic and humidistatic chamber can adopt the existing technology. During the test, physiological saline or other required electrolyte solutions are put into it. As a preferred solution, the frame 1 includes a support member 101 and a horizontal platform 102. After the support member 101 and the horizontal platform 102 are fixedly connected, they are as Figure 1The structure shown, the fixed connection can be welding or threaded connection. The constant temperature and humidity chamber 3 and the drive module 2 are respectively arranged on the left and right sides of the support member 101, and both the drive module 2 and the constant temperature and humidity chamber 3 are located below the first transmission module 4. The frame 1 further includes a base. The drive module 2 is fixedly connected to the side wall of the support member 103 to reduce the vibration to the base. The constant temperature and humidity chamber 3 is only fixedly connected to the base through a plurality of uniformly distributed support rods. The support rods can be square or columnar, and the material can be metal or plastic. At the same time, the side wall of the constant temperature and humidity chamber 3 does not contact the support member 101. By designing the constant temperature and humidity chamber to be only connected to the frame base through support rods, the coupling with other mechanical components in the device is reduced, the mechanical vibration transmitted to the constant temperature and humidity chamber is reduced, and the accuracy of the test results is improved. The drive module 2, the first transmission module 4, and the constant temperature and humidity chamber 3 are arranged in a mutually separated form and a rod-shaped connecting shaft is used to connect the sample clamping device, ensuring that the device structure immersed in the constant temperature and humidity chamber 3 is small, reducing the erosion of water and electrolytes on the device, and thus improving the overall service life of the device. To ensure the normal function of the device, the sample clamping device 6 should be located in the constant temperature and humidity chamber 3. Among them, the connecting rod 502 is cylindrical. Compared with rods of other shapes, it disturbs the liquid test environment in the constant temperature and humidity chamber less, and thus makes the test influencing factors less and the test results more accurate.

[0048] The sample clamping device 6 of the second transmission module for torsion test has a round hole opened on the horizontal platform 102. The sample clamping device 6 includes a connecting end, a supporting end, and a clamping end for fixing the sample. The connecting end is used for fixedly connecting with the connecting rod 502. The supporting end is rotatably connected to the round hole of the horizontal platform 102 through a rolling bearing. The rolling bearing can be a deep groove ball bearing or an angular contact bearing. By adding a rolling bearing to the connecting rod, the stability of the connecting rod during rotation test is enhanced, and the situation that the connecting rod deflects in all directions is avoided, thus affecting the test results. At the same time, the horizontal platform 102 is provided with a slotted hole. The connecting rod 502 of the second transmission module 5 for bending test is slidably connected with the slotted hole and the diameter of the connecting rod 502 of the second transmission module 5 for bending test matches the width of the slotted hole, so that the connecting rod will not deflect to both sides due to the limitation of the slotted hole during the bending test, and thus the accuracy of the test results is ensured.

[0049] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A fatigue test device for a flexible artificial intervertebral disc prosthesis, characterized in that, Comprising: A frame (1), a drive module (2), a first transmission module (4), and a second transmission module (5). The first transmission module (4) includes a first slide rail (402) and a second slide rail (403). The first slide rail (402) is slidably connected to the second slide rail (403), and the drive module (2) is used to drive the first slide rail (402) to slide. The second transmission module (5) includes a second slider (501) and a connecting rod (502). The second slider (501) is rotatably connected to the second slide rail (403) and slidably connected to the connecting rod (502). The drive module (2) includes a motor (201) and a disc (203) driven by the motor (201). The first transmission module (4) further includes a first slider (401). The first slide rail (402) and the second slide rail (403) are arranged perpendicular to each other in the horizontal plane. The first slider (401) is slidably connected to the second slide rail (403) and connected to the disc (203). The number of the second slide rails (403) is two and they are symmetrically distributed about the disc (203) in the horizontal direction. The second slider (501) includes a first connecting plate and a second connecting plate perpendicular to and fixedly connected to the first connecting plate. The first connecting plate and the second connecting plate are respectively provided with a first through hole and a second through hole. The first connecting plate is slidably connected to the connecting rod (502) based on the first through hole, and the second connecting plate is rotatably connected to the second slide rail (403) based on the second through hole. One end of the second slide rail (403) close to the second transmission module (5) is provided with a horizontal connection side and a vertical connection side. When the second slider (501) is rotatably connected to the horizontal connection side through a torsion mode connection block (505) and one end of the connecting rod (502) is fixedly connected to a clamping device through a torsion end connection block (504), the second transmission module (5) is used for torsion testing. When the second slider (501) is rotatably connected to the vertical connection side through a bending mode connection block (506), the second transmission module (5) is used for bending testing. A specimen clamping device (6) is provided at the end of the connecting rod (502).

2. The fatigue test device for a flexible artificial intervertebral disc prosthesis according to claim 1, characterized in that, The testing device further includes a thermostatic and humidistatic chamber (3) for simulating the physiological environment of the specimen. The frame (1) includes a support member (101) and a horizontal platform (102) fixedly connected to the support member (101). The drive module (2) and the thermostatic and humidistatic chamber (3) are both located below the first transmission module (4), and the specimen clamping device (6) is located in the thermostatic and humidistatic chamber (3).

3. The fatigue test device for a flexible artificial disc prosthesis according to claim 2, characterized in that, The connecting rod (502) is cylindrical.

4. The fatigue test device for a flexible artificial intervertebral disc prosthesis according to claim 3, characterized in that, The horizontal platform (102) is provided with a round hole. The specimen clamping device (6) of the second transmission module (5) for torsion test includes a connection end, a support end, and a clamping end for fixing the specimen. The connection end is fixedly connected to the connecting rod (502) indirectly or directly. The connection end, the support end, and the clamping end are arranged vertically in sequence from top to bottom. The support end is rotatably connected to the round hole through a rolling bearing.

5. A fatigue test device for a flexible artificial intervertebral disc prosthesis according to claim 2, characterized in that, The frame further includes a base. The upper surface of the base is fixedly connected to the temperature and humidity chamber (3) through a number of uniformly distributed support rods. There is a gap between the temperature and humidity chamber (3) and the support member (101) after connection.

6. The fatigue test device for a flexible artificial intervertebral disc prosthesis according to claim 1, characterized in that, A number of pin holes are formed on the surface of the disc (203). The first slider (401) is detachably connected to the pin holes.

7. A fatigue test device for a flexible artificial disc prosthesis according to claim 2, characterized in that, The horizontal platform (102) is provided with a slot-shaped hole. The connecting rod (502) of the second transmission module (5) for bending test is slidably connected to the slot-shaped hole, and the diameter of the connecting rod (502) of the second transmission module (5) for bending test matches the width of the slot-shaped hole.

8. A fatigue test device for a flexible artificial disc prosthesis according to claim 1, characterized in that, The drive module (2) further includes a torque sensor (202) connected to the output shaft of the motor (201). The frame (1) is fixedly connected with a photoelectric counter (7) for recording the reciprocating times of the connecting rod (502).

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