A spinal nail-rod flexion-extension torque test tool

Abstract

The utility model relates to medical instrument technical field, and specifically is a kind of spine nail rod flexion and extension torque test tool, including base;Two slots, two slots are all set up in the upper end of base;Spine nail rod support structure and locking rod, spine nail rod support structure and locking rod are located in two slots respectively;Groove, groove is set up in the lower end of spine nail rod support structure;Through the cooperation structure of setting base, slot, spine nail rod support structure and locking rod, the quick clamping and stable fixation of nail rod system are realized. Among them, the symmetrical design of slot ensures the accurate alignment during installation, and the detachable connection mode of spine nail rod support structure and locking rod facilitates the replacement of different specifications of nail rod system. The cooperation design of U-shaped spine nail rod support structure and connecting rod can provide stable three-point support during testing, effectively simulate the stress state of spine nail rod in human body, and significantly improve the accuracy and reliability of test data.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a testing fixture for spinal rod flexion-extension torque. Background Technology

[0002] Spinal screw fixation is a surgical technique that uses internal fixation devices such as screws, rods, or plates to stabilize the spine, correct deformities, or promote bone fusion. It is mainly divided into posterior screw fixation and anterior screw fixation. The flexion-extension torque and anteroposterior mechanical properties of the spinal screw-rod system are important performance indicators affecting the screw implantation effect and determining the reliability of the spinal screw in the human body. Existing fixtures can only perform flexion-extension torque tests individually, and the fixing clamping holes on the fixtures are not suitable for spinal screw-rod products of different diameters.

[0003] Traditional fixtures can only perform flexion-extension moment tests in a single direction, failing to meet the needs of multi-directional mechanical performance evaluation. The fixed clamping hole size of the fixture is fixed and cannot be adapted to spinal rods of different diameters, resulting in a limited testing range. The design of the fixing spacing and hole diameter of the test device is unreasonable, usually requiring the spinal rod to be installed first before connecting the rod system, affecting the uniformity and stability of the installation and making it difficult to simulate the fixation state in real surgery. Therefore, a spinal rod flexion-extension moment testing fixture is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a spinal rod flexion-extension moment testing fixture to solve the above-mentioned problems. It improves upon the traditional fixture, which can only perform flexion-extension moment testing in one direction and cannot simultaneously meet the needs of multi-directional mechanical performance evaluation. The fixture has fixed clamping hole sizes, which cannot be adapted to spinal rods of different diameters, resulting in a limited testing range. The design of the fixing spacing and hole diameter of the testing device is unreasonable. Usually, the spinal rod needs to be installed first and then the rod system is connected, which affects the uniformity and stability of the installation and makes it difficult to simulate the fixation state in real surgery.

[0005] This utility model achieves the above objectives through the following technical solution: a spinal screw rod flexion-extension moment testing fixture, comprising:

[0006] Base;

[0007] Two slots, both of which are located at the upper end of the base;

[0008] A spinal rod support structure and a locking rod, wherein the spinal rod support structure and the locking rod are respectively located in two slots;

[0009] A groove is formed at the lower end of the spinal screw-rod support structure;

[0010] The mounting groove is formed on one side end of the locking rod;

[0011] A connecting rod, wherein the connecting rod is located within a mounting slot and a recess;

[0012] A spinal rod, wherein the spinal rod is sleeved on the circumferential surface of the connecting rod;

[0013] The U-shaped spinal screw-rod support structure is located at the lower end of the spinal screw-rod support structure.

[0014] Preferably, the lower end of the U-shaped spinal screw support structure has a threaded hole that extends through the spinal screw support structure.

[0015] Preferably, a locking hole is provided on one side of the base.

[0016] Preferably, the spinal screw support structure and locking rod are designed to match the slot to ensure precise alignment during installation.

[0017] Preferably, the two ends of the connecting rod are provided with anti-dislodgement limiting structures to prevent the spinal rod from undergoing axial displacement during the test.

[0018] Preferably, the spinal rod is used to simulate the mechanical properties of a real spinal implant.

[0019] The beneficial effects of this utility model are:

[0020] By designing a cohesive structure consisting of a base, slots, a spinal rod support structure, and a locking rod, the system achieves rapid clamping and stable fixation. The symmetrical design of the slots ensures precise alignment during installation, while the detachable connection of the spinal rod support structure and locking rod facilitates the replacement of different rod sizes. The U-shaped spinal rod support structure, in conjunction with the connecting rod, provides stable three-point support during testing, effectively simulating the stress state of the spinal rod within the human body, significantly improving the accuracy and reliability of test data.

[0021] It enables rapid adaptation to different specifications of spinal rods, and the combination of threaded holes and locking holes makes the device highly adjustable and stable. The anti-dislodgement limiting structure effectively prevents axial displacement of the rods during testing. Attached Figure Description

[0022] Figure 1 This is a sectional perspective view of the present invention;

[0023] Figure 2 This is the first exploded view of this utility model;

[0024] Figure 3 This is a sectional perspective view of the present invention;

[0025] Figure 4This is the second exploded view of this utility model.

[0026] In the diagram: 1. Base; 2. Slot; 3. Locking hole; 4. Spinal screw support structure; 5. Locking rod; 6. Mounting slot; 7. Connecting rod; 8. Spinal screw; 9. U-shaped spinal screw support structure; 10. Threaded hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1

[0029] Please see Figures 1-4 The present invention provides the following technical solution:

[0030] A spinal rod flexion-extension moment testing fixture includes:

[0031] Base 1;

[0032] Two slots 2, both slots 2 are located at the upper end of the base 1;

[0033] The spinal rod support structure 4 and the locking rod 5 are located in two slots 2 respectively.

[0034] The groove is located at the lower end of the spinal rod support structure 4;

[0035] Mounting groove 6 is provided on one side of the locking rod 5;

[0036] Link 7 is located in mounting slot 6 and recess;

[0037] Spinal rod 8, the spinal rod 8 is sleeved on the circumferential surface of the connecting rod 7;

[0038] U-shaped spinal screw support structure 9 is located at the lower end of spinal screw support structure 4.

[0039] In a specific embodiment of this utility model, when the mechanical performance of the spinal rod 8 needs to be tested, the base 1 is first fixed on the test platform, ensuring that the two slots 2 are horizontally aligned. The spinal rod support structure 4 is inserted into one of the slots 2, and the locking rod 5 is inserted into the other slot 2 and fixed with fasteners. When installing the test sample, one end of the connecting rod 7 is first embedded into the groove at the lower end of the spinal rod support structure 4, and the other end is placed into the mounting groove 6 of the locking rod 5. Then, the spinal rod 8 is sleeved on the circumferential surface of the connecting rod 7, and the bottom support is provided by the U-shaped spinal rod support structure 9. When the test load is applied, the spinal rod 8 generates under the constraint of the connecting rod 7. Bending and deforming, the spinal rod support structure 4 and locking rod 5 transmit the reaction force to the base 1 through the slot 2, while the U-shaped spinal rod support structure 9 provides stable support. After the test is completed, the locking rod 5 and spinal rod support structure 4 can be removed simply by loosening the fasteners, enabling quick replacement of the test sample. The combination of base 1, slot 2, spinal rod support structure 4 and locking rod 5 enables quick clamping and replacement of samples. The U-shaped spinal rod support structure 9 and connecting rod 7 form a stable force transmission path, ensuring the accuracy of test data. By replacing connecting rod 7 of different specifications and mounting slot 6 adapter components, the testing requirements of various models of spinal rods 8 can be met.

[0040] Please refer to the details. Figures 1-4 The lower end of the U-shaped spinal rod support structure 9 has a threaded hole 10 that passes through the spinal rod support structure 4.

[0041] In this embodiment: when it is necessary to adjust the height of the U-shaped spinal rod support structure 9, the adjusting bolt is screwed into the threaded hole 10 to make the U-shaped spinal rod support structure 9 move up and down along the spinal rod support structure 4 to adapt to the testing requirements of different specifications of spinal rods 8.

[0042] Please refer to the details. Figures 1-4 A locking hole 3 is provided on one side of the base 1.

[0043] In this embodiment: when it is necessary to fix the spinal rod support structure 4 or the locking rod 5, the fastening bolt is passed through the locking hole 3 and tightened to ensure that the spinal rod support structure 4 and the locking rod 5 do not loosen during the test, thereby improving the stability of the test.

[0044] Please refer to the details. Figures 1-4 The spinal screw support structure 4 and locking rod 5 are designed to match the slot 2 to ensure precise alignment during installation.

[0045] In this embodiment: when installing the spinal screw rod support structure 4 and the locking rod 5, the precise fit of the slot 2 enables the two to be quickly positioned and kept coaxial, avoiding the impact of installation deviation on test accuracy.

[0046] Please refer to the details. Figures 1-4 The two ends of the connecting rod 7 are equipped with anti-dislodgement limiting structures to prevent the spinal rod 8 from undergoing axial displacement during the test.

[0047] In this embodiment, when the spinal rod 8 is under load, its axial movement is restricted by the anti-dislodgement limiting structure at both ends of the connecting rod 7, ensuring that the spinal rod 8 only undergoes bending deformation within the design range, thereby improving the reliability of the test.

[0048] Please refer to the details. Figures 1-4 The spinal rod 8 is used to simulate the mechanical properties of real spinal implants.

[0049] In this embodiment: when conducting biomechanical tests, the spinal rod 8 can realistically reproduce its mechanical behavior in the human body, ensuring that the test data has clinical reference value.

[0050] All standard parts used in this invention can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through the control unit. The control circuit of the control unit can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Therefore, the control method and circuit connection will not be explained in detail in this invention.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fixture for testing the flexion-extension torque of a spinal screw-rod, characterized in that, include: Base (1); Two slots (2), both slots (2) are located at the upper end of the base (1); The spinal rod support structure (4) and the locking rod (5) are located in two slots (2), respectively. The groove is formed at the lower end of the spinal rod support structure (4); Mounting groove (6), which is located at one end of locking rod (5); Linkage (7), which is located in mounting slot (6) and groove; Spinal screw rod (8), the spinal screw rod (8) is sleeved on the circumferential surface of the connecting rod (7); U-shaped spinal rod support structure (9), which is located at the lower end of spinal rod support structure (4).

2. The spinal screw-rod flexion-extension moment testing fixture according to claim 1, characterized in that: The lower end of the U-shaped spinal nail support structure (9) has a threaded hole (10) that extends through the spinal nail support structure (4).

3. The spinal rod flexion-extension moment testing fixture according to claim 2, characterized in that: A locking hole (3) is provided on one side of the base (1).

4. The spinal screw-rod flexion-extension moment testing fixture according to claim 3, characterized in that: The spinal screw support structure (4) and locking rod (5) are designed to match the slot (2) to ensure precise alignment during installation.

5. The spinal rod flexion-extension moment testing fixture according to claim 4, characterized in that: The connecting rod (7) is provided with anti-dislodgement limiting structures at both ends to prevent the spinal nail rod (8) from axial displacement during the test.

6. The spinal screw-rod flexion-extension moment testing fixture according to claim 5, characterized in that: The spinal rod (8) is used to simulate the mechanical properties of a real spinal implant.

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