An internal spinal fixation pull-out test device

Abstract

The utility model discloses a kind of internal fixation of spine pull test device, specifically related to spine pull experimental technical field, including base, test assembly is arranged on the base, the test assembly includes the several spinal blocks of setting at the top of base, for simulating patient spine.The utility model is by setting multiple segments side-by-side spinal block, and in the both ends of spinal block bonding medical silica gel material's protective pad, both simulate the buffer characteristic of intervertebral disc between vertebral body, also avoid the wear and tear of spinal block in test process;With the rotary connection structure of extension seat and extension block, the flexible angle adjustment of adjacent spinal block is realized, can accurately restore the physiological activity of human spine flexion, lateral flexion and other multi-attitude, solve the single simulation scene of existing device, and the problem of disconnection with clinical practice, so that detection data can more reflect the real stress state of internal fixation system in human body.

Description

Technical Field

[0001] This utility model relates to the field of spinal traction testing technology, and more specifically, to a spinal internal fixation traction testing device. Background Technology

[0002] In orthopedic clinical treatment, spinal internal fixation systems (such as pedicle screws, connecting rods, and fusion cages) are core implants for treating spinal fractures, scoliosis, and herniated discs. Their mechanical properties directly affect surgical efficacy and postoperative rehabilitation outcomes. Spinal internal fixation traction testing devices, as key equipment for verifying the reliability of these implants, must accurately simulate the physiological stress environment of the human spine to comprehensively test the mechanical properties of the implants and their combined systems.

[0003] However, existing spinal internal fixation traction testing devices lack realism in simulation. Traditional devices often employ rigid connections or single-angle designs for their spinal simulation structures, failing to replicate the physiological characteristics of multi-segment coordinated movement of the human spine. This results in discrepancies between test data and actual clinical stress scenarios. Furthermore, the testing dimensions are limited, with most devices only capable of axial tension or pull-out tests in a single direction. This makes it difficult to cover stress conditions under various postures, such as flexion-extension and lateral flexion, thus hindering a comprehensive assessment of the overall mechanical stability of the internal fixation system. Additionally, the structural adaptability is poor, with fixed connections between support components and spinal simulation blocks, making it difficult to adapt to different specifications and types of internal fixation implants. Moreover, friction and collisions between components during testing can easily damage the simulation structure, affecting test repeatability. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a spinal internal fixation traction test device, which aims to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a spinal internal fixation traction test device, including a base, on which a test component is provided; The test assembly includes several spinal blocks set on the top of the base to simulate the patient's spine, wherein two spinal blocks are each provided with two support blocks, and each support block is provided with a limit pin at its bottom end. The support block has a misalignment opening in the middle, and a turntable is rotatably connected inside the misalignment opening. A tension sensor for pulling detection is provided on one side of the turntable, which is used to deflect the spinal block to change the angle of the spinal block and detect the tension by the tension sensor.

[0006] Optionally, in one possible implementation, an extension seat is provided on each of the plurality of spinal blocks, and an extension block is provided on each of the extension seats. The plurality of extension seats and extension blocks are arranged side by side, and one end of the extension block extends to an adjacent extension seat and is rotatably connected to the extension seat for adjusting the angle of two adjacent spinal blocks. Protective pads are provided at both ends of the spinal blocks, and the protective pads are adhered to the ends of the spinal blocks. Optionally, in one possible implementation, the support block is fixedly connected to the limiting pin, the limiting pin extends to the spinal block and is threadedly connected to the spinal block, a plurality of spinal blocks are arranged side by side, and the two spinal blocks at the far end are respectively provided with an extension rod, one end of the two extension rods is respectively provided with a top plate, and the bottom end of each top plate is respectively hinged with a hinge seat, the bottom ends of the two hinge seats are fixed on the base, for moving the spinal block to cause the spinal block to drive the extension rod and the top plate to deflect along the connection between the top plate and the hinge seat; The technical effects and advantages of this utility model are as follows: By setting up multi-segment parallel spinal blocks and attaching medical-grade silicone protective pads to both ends of the spinal blocks, the buffering characteristics of the intervertebral discs between vertebrae are simulated, while avoiding wear and tear on the spinal blocks during the experiment. Combined with the rotating connection structure between the extension seat and the extension block, the angle of adjacent spinal blocks can be flexed flexed, lateral flexion, and other physiological activities of the human spine. This solves the problem of existing devices simulating a single scenario and being out of touch with clinical reality, making the test data more reflective of the actual stress state of the internal fixation system in the human body. Through the collaborative design of support blocks, turntables, and tension sensors, it can not only complete the pull-out force and pull-out strength tests of individual internal fixation devices such as pedicle screws, but also perform axial tension and multi-angle stress tests on complete internal fixation systems composed of screws, connecting rods, and locking devices, comprehensively evaluating the system's stiffness, fatigue resistance, and failure limit. With the limiting support structure of the end extension rod, top plate, and hinge seat, it ensures that the tension transmission process is stable and controllable, realizing an upgrade from single performance testing to multi-dimensional comprehensive evaluation, and solving the shortcomings of the limited testing functions of existing devices. The support block is threadedly connected to the spinal block via limiting pins, allowing for quick replacement of the appropriate support block to suit different sizes of internal fixation implants, significantly improving compatibility. The rotating design of the turntable within the misalignment opening can counteract minor deviations in the direction of tension, ensuring that the tension acts perpendicularly on the internal fixation system and avoiding detection errors caused by stress concentration. At the same time, the buffering effect of the protective pad and the high-strength design of the base effectively protect the integrity of the test components, improve the repeatability and stability of the test, and solve the problems of poor compatibility and large fluctuations in test data of existing devices. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0008] Figure 1 This is a front view of the overall structure of this utility model.

[0009] Figure 2 This is a side view of the overall structure of this utility model.

[0010] Figure 3 This is a schematic diagram of the spinal block, protective pad, turntable, tension sensor, and support block of this utility model.

[0011] Figure 4 This is a schematic diagram of the base, top plate, extension seat, extension block, spine block, and hinge seat of this utility model.

[0012] Figure 5 This is a schematic diagram of the limiting pin, support block, misalignment port, turntable, and tension sensor of this utility model.

[0013] The attached diagram is labeled as follows: 1. Base; 2. Spine block; 3. Extension seat; 4. Extension block; 5. Limiting pin; 6. Support block; 7. Misalignment port; 8. Turntable; 9. Tension sensor; 10. Protective pad; 11. Extension rod; 12. Top plate; 13. Hinge seat. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] Example 1 This embodiment discloses a spinal internal fixation traction test device, which aims to accurately simulate the stress environment of the human spine and achieve efficient testing of key mechanical properties of spinal internal fixation systems such as pedicle screws, connecting rods, and fusion devices, including pull-out force, pull-out strength, axial stiffness, and fatigue resistance. This solves the problems of insufficient simulation realism, single testing dimensions, and lack of operational flexibility of existing test devices.

[0016] Specifically, such as Figure 1 , Figure 2As shown, the spinal internal fixation traction testing device includes a horizontally placed base 1, which is made of high-strength alloy material to ensure the stability of the overall structure during the test and avoid affecting the accuracy of the test data due to base deformation. A testing component is installed on the top of the base 1, which is the core structure for testing the mechanical properties of the spinal internal fixation system.

[0017] The testing component includes several spinal blocks 2 arranged side by side. These spinal blocks 2 are made of polyurethane material, whose density, hardness, and other mechanical parameters are similar to those of human vertebral bone tissue, used to accurately simulate the physiological structure of a patient's spine. For example... Figure 3 As shown, each spinal block 2 has a protective pad 10 attached to both ends. The protective pad 10 is made of medical-grade silicone, which can not only buffer when the adjacent spinal blocks 2 deflect at an angle, preventing the ends of the spinal blocks 2 from being damaged by friction, but also simulate the buffering characteristics of the intervertebral disc between the vertebrae, thus improving the realism of the experimental simulation.

[0018] like Figure 1 , Figure 4 As shown, each spinal block 2 has an integrally formed extension seat 3, and each extension seat 3 is fixed with an extension block 4 by bolts. Multiple extension seats 3 and extension blocks 4 are arranged side-by-side along the arrangement direction of the spinal blocks 2, and the end of each extension block 4 away from its own extension seat 3 extends to the adjacent extension seat 3 and is rotatably connected to that extension seat 3 via a pivot. This structural design allows two adjacent spinal blocks 2 to achieve a certain angle adjustment around the pivot, thereby simulating the stress state of the human spine under different physiological postures such as flexion, extension, and lateral flexion, broadening the scope of the experiment.

[0019] like Figure 1 , Figure 5 As shown, two support blocks 6 are respectively provided on the two spinal blocks 2 located in the middle position. The support block 6 is a cuboid structure, and a limit pin 5 is welded and fixed at its bottom end. The end of the limit pin 5 away from the support block 6 extends into the pre-set threaded hole on the spinal block 2 and is threadedly connected to the spinal block 2. The support block 6 and the spinal block 2 are detachably fixed by means of threaded connection, which makes it easy to replace the support block 6 with a suitable one according to different specifications of spinal internal fixation components.

[0020] A misalignment opening 7 is provided in the middle of the support block 6. The misalignment opening 7 has a U-shaped structure, and its opening direction faces outward of the spinal block 2. A turntable 8 is rotatably connected to the misalignment opening 7 via a bearing, and the turntable 8 can rotate freely around the bearing axis. A tension sensor 9 is fixedly connected to the side of the turntable 8 away from the spinal block 2 by bolts. The measurement range is 0-50kN, and the accuracy class is 0.1. It can detect the tension data during the pulling process in real time and accurately, and transmit the data to an external data acquisition system for analysis and processing. By deflecting the spinal block 2, the angle of the spinal block 2 is changed, thereby simulating the tension borne by the spinal internal fixation system during spinal movement. The tension is detected by the tension sensor 9.

[0021] Example 2 Based on Example 1, this example discloses a spinal internal fixation traction testing device, such as... Figure 1 , Figure 2 As shown, extension rods 11 are welded to the two spinal blocks 2 at the far end. The extension rods 11 are perpendicular to the spinal blocks 2. The ends of the two extension rods 11 away from the spinal blocks 2 are respectively fixed to top plates 12 by bolts. The top plates 12 are rectangular steel plates. The bottom end of each top plate 12 is hinged to a hinge seat 13 by a hinge. The bottom ends of the two hinge seats 13 are fixed to the base 1 by expansion bolts. When the external drive mechanism pulls the middle spinal block 2 through the tension sensor 9, the spinal block 2 will drive the extension rods 11 and the top plates 12 to deflect along the hinge point between the top plates 12 and the hinge seats 13. This structure can not only provide limiting support for the end spinal blocks 2, but also ensure the flexible deflection of the spinal blocks 2 under force, further improving the realism of the experimental simulation.

[0022] The specific working principle of this embodiment is as follows: According to the specifications of the spinal internal fixation system to be tested, the pedicle screws and other components are installed on the spinal block 2 according to the clinical implantation standards to ensure that the installation position is consistent with the actual implantation position of the human spine; the initial angle of the adjacent spinal block 2 is adjusted by the rotational connection structure of the extension seat 3 and the extension block 4 to simulate the natural physiological curvature of the human spine; the connection status of the tension sensor 9 is checked to ensure that it communicates normally with the external data acquisition system and zero-point calibration is performed.

[0023] By manually pulling the spinal block 2 or activating an external drive mechanism, the drive mechanism applies a horizontal pulling force to the turntable 8 via the tension sensor 9. The turntable 8 rotates within the misalignment opening 7, smoothly transmitting the pulling force to the support block 6, thereby pulling the corresponding spinal block 2. Under the action of the pulling force, the middle spinal block 2 deflects, and the adjacent spinal blocks 2 deflect in coordination through the rotational connection structure between the extension seat 3 and the extension block 4. The spinal blocks 2 at the ends drive the extension rod 11 and the top plate 12 to deflect along the hinge seat 13. The entire process accurately simulates the activity state of the human spine under force.

[0024] The tension sensor 9 collects tension data in real time during the pulling process, including peak tension, stable tension, and tension change curves, and transmits the data to an external data acquisition system. By analyzing this data, key mechanical parameters of the spinal internal fixation system, such as pull-out force, pull-out strength, and axial stiffness, can be obtained to determine whether it can withstand the physiological load of the human spine, providing a reliable mechanical performance basis for the clinical application of the spinal internal fixation system.

[0025] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A spinal internal fixation traction testing device, comprising a base (1), characterized in that: The base (1) is provided with test components; The test assembly includes several spinal blocks (2) set on the top of the base (1) to simulate the patient's spine, wherein two support blocks (6) are respectively set on two spinal blocks (2), and each support block (6) is provided with a limiting nail (5) at its bottom end. The support block (6) has a misalignment opening (7) in the middle, and a turntable (8) is rotatably connected inside the misalignment opening (7). A tension sensor (9) for pulling detection is provided on one side of the turntable (8), which is used to deflect the spinal block (2) so that the angle of the spinal block (2) changes and the tension is detected by the tension sensor (9).

2. The spinal internal fixation traction testing device according to claim 1, characterized in that: Each of the multiple spinal blocks (2) is provided with an extension seat (3), and each of the extension seats (3) is provided with an extension block (4).

3. The spinal internal fixation traction testing device according to claim 2, characterized in that: Multiple extension seats (3) and extension blocks (4) are arranged side by side, and one end of the extension block (4) extends to the adjacent extension seat (3) and is rotatably connected to the extension seat (3) for adjusting the angle of the two adjacent spinal blocks (2).

4. The spinal internal fixation traction testing device according to claim 1, characterized in that: Protective pads (10) are provided at both ends of the spinal block (2), and the protective pads (10) are adhered to the ends of the spinal block (2).

5. The spinal internal fixation traction testing device according to claim 1, characterized in that: The support block (6) is fixedly connected to the limiting pin (5), which extends to the spinal block (2) and is threadedly connected to the spinal block (2).

6. The spinal internal fixation traction testing device according to claim 1, characterized in that: Multiple spinal blocks (2) are arranged side by side, and extension rods (11) are respectively provided on the two spinal blocks (2) at the far end.

7. The spinal internal fixation traction testing device according to claim 6, characterized in that: One end of each of the two extension rods (11) is provided with a top plate (12), and the bottom end of each top plate (12) is hinged with a hinge seat (13).

8. The spinal internal fixation traction testing device according to claim 7, characterized in that: The bottom ends of the two hinge seats (13) are fixed on the base (1) to move the spinal block (2) so that the spinal block (2) drives the extension rod (11) and the top plate (12) to deflect along the connection between the top plate (12) and the hinge seat (13).

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