Spinal screw rod flexion and extension test tool

Abstract

The present invention discloses a spinal nail rod flexion and extension force test fixture. The guide rail can adjust the horizontal position. The guide rail and the spinal nail rod support structure are fixed together with bolts, which is easy to install. The V-shaped groove on the test fixture facilitates the adjustment of the vertical position of the spinal nail rod, so that it can effectively ensure that the spinal rod is perpendicular to the working base of the testing machine, thereby meeting the test requirements. The locking bolt facilitates force clamping and can effectively fix the spinal nail rod test sample to prevent it from vertical displacement or rotation.

Description

Technical Field

[0001] The invention relates to a spinal screw rod related test loading device, in particular to a spinal screw rod flexion and extension fatigue test loading device. Background Art

[0002] Spinal screw fixation is widely used internationally to treat conditions such as degenerative scoliosis, congenital scoliosis, and thoracolumbar fractures. The flexion and extension force of the spinal screw rod is an important performance indicator for evaluating the reliability of spinal screws, which directly determines the reliability of spinal screws in the human body. Existing tooling cannot effectively clamp various screws, and an effective clamping tool is needed to fix the spinal screws for testing. The force applied to the spinal screw by the experimental device will cause the spinal screw to move, so a specific tooling is needed to limit its degrees of freedom. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a spinal nail rod flexion and extension force testing tool that can achieve spinal nail rod fixation, can be connected to a testing machine to fix the spinal nail rod for a long time, and has a certain degree of position adjustment capability.

[0004] The spinal nail rod flexion and extension force testing tool of the present invention comprises a spinal nail rod locking structure, a spinal nail rod supporting structure and a base, wherein two threaded holes connected to the testing machine are respectively provided on the front and rear sides of the base, a groove is provided in the middle of the base and along the length direction of the base, the spinal nail rod supporting structure is L-shaped, a slider is provided in the middle of the bottom wall of the horizontal support of the spinal nail rod supporting structure, the slider is installed in the groove and can slide along the groove, a plurality of threaded holes are spaced apart on the left and right sides on the bottom wall of the groove, an elongated hole is provided on the rear side of the horizontal support of the spinal nail rod supporting structure and a circular hole with an axis arranged in the vertical direction is provided on the front side of the horizontal support, the spinal nail rod supporting structure is fixedly connected to the base by bolts passing through the elongated hole and the threaded holes on the groove and by bolts passing through the circular hole and the threaded holes on the groove respectively;

[0005] The U-shaped grooves are arranged at intervals in the upper and lower parts on the right wall of the vertical support of the spinal nail rod supporting structure, and in order from top to bottom, a fixed end V-groove is opened from the outer wall to the inner side in the middle of the upper and lower side walls of the first U-shaped groove and the third U-shaped groove, and the upper and lower sides of the spinal nail rod arranged in the vertical direction are respectively clamped in the fixed end V-groove and fixed in the fixed end V-groove by the spinal nail rod locking structure. The spinal nail rod locking structure is fixedly connected to the spinal nail rod supporting structure. The two spinal nail rod locking structures each include a T-shaped block, and a movable end V-groove is opened in the middle of the horizontal end outer wall of the T-shaped block. The horizontal ends of the T-shaped blocks of the two spinal nail rod locking structures are respectively inserted into the first U-shaped groove and the third U-shaped groove, and the movable end V-groove is clamped on the spinal nail rod, and the vertical end of the T-shaped block is fixedly connected to the bolt holes opened on the bottom wall of the first U-shaped groove and the third U-shaped groove by bolts.

[0006] Advantages of the present invention:

[0007] 1. The guide rail is used to adjust the horizontal position.

[0008] 2. The guide rail and the spinal screw rod supporting structure are fixed with bolts, which is easy to install.

[0009] 3. The V-shaped groove facilitates the adjustment of the vertical position of the spinal rod, which can effectively ensure that the spinal rod is perpendicular to the working surface of the testing machine.

[0010] 4. The locking bolt can effectively fix the spinal rod to prevent it from vertical displacement or rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a three-dimensional diagram of the overall structure of the spinal screw rod flexion and extension force test tool of the present invention;

[0012] Figure 2 for Figure 1 a perspective view of the base in the illustrated configuration;

[0013] Figure 3 for Figure 1 A perspective view of the spinal nail rod support structure in the structure shown;

[0014] Figure 4 for Figure 1 A bottom-view plan view of the spinal screw and rod support structure in the structure shown;

[0015] Figure 5 for Figure 1 A three-dimensional view of the spinal screw rod locking structure in the structure shown. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] As shown in the accompanying drawings, the spinal nail rod flexion and extension force testing tool of the present invention includes a spinal nail rod locking structure 3, a spinal nail rod support structure 4, and a base 5. Two threaded holes 6 for connecting to a testing machine are provided on the front and rear sides of the base, respectively, and can be fixed to the testing machine via bolts. A groove is provided in the center of the base and along its length. The spinal nail rod support structure 4 is L-shaped. A slider is provided in the center of the bottom wall of the horizontal support of the spinal nail rod support structure 4. The slider is mounted in the groove and can slide along the groove. Multiple threaded holes 6 are spaced apart on the bottom wall of the groove. An elongated hole is provided on the rear side of the horizontal support of the spinal nail rod support structure 4, and a circular hole with a vertical axis is provided on the front side of the horizontal support. The spinal nail rod support structure 4 is fixedly connected to the base 5 by bolts passing through the elongated hole and the threaded hole in the groove, and by bolts passing through the circular hole and the threaded hole in the groove, respectively. The spinal nail rod support structure 4 is slidably connected to the groove via the slider, which is used to adjust the position of the spinal nail rod support structure 4 along the groove direction and to fix the position.

[0018] On the right wall of the vertical support of the spinal nail rod supporting structure 4, four U-shaped grooves are arranged at intervals up and down. According to the order from top to bottom, in the middle of the upper and lower side walls of the first U-shaped groove and the third U-shaped groove, a fixed end V-shaped groove 7 is respectively opened from the outer wall to the inside. The upper and lower sides of the spinal nail rod 2 arranged in the vertical direction are respectively stuck in the fixed end V-shaped groove 7 and fixed in the fixed end V-shaped groove 7 by the spinal nail rod locking structure 3. The spinal nail rod locking structure 3 is fixedly connected to the spinal nail rod supporting structure 4. Placing the spinal rod in the V-shaped groove can keep it vertical, and the distance between the spinal screw 1 on the spinal rod and the testing machine in the vertical direction can be adjusted.

[0019] The two spinal nail rod locking structures 3 both include a T-shaped block, and a movable end V-shaped groove is opened in the middle of the horizontal end outer wall of the T-shaped block. The horizontal ends of the T-shaped blocks of the two spinal nail rod locking structures 3 are respectively inserted into the first U-shaped groove and the third U-shaped groove. The movable end V-shaped groove is clamped on the spinal nail rod, and the vertical end of the T-shaped block is fixedly connected to the bolt holes opened on the bottom wall of the first U-shaped groove and the third U-shaped groove by bolts.

[0020] The spinal screw rod locking structure 3 can be connected and aligned with the spinal screw rod supporting structure 4 through two bolts. A movable end V-shaped groove is provided on the spinal screw rod. The spinal rod is tightened by adjusting the screw-in depth of the bolts, thereby fixing the spinal screw.

[0021] The method of using this device is:

[0022] (1) Connect the base of this device to the lower base of the testing machine with bolts.

[0023] (2) Place the test sample - spinal rod into the V-shaped groove at the fixed end of the spinal screw rod support structure 4 and adjust the position of the test sample.

[0024] (3) Use bolts to connect the spinal nail rod locking structure and the spinal nail rod supporting structure to fix the position of the test sample.

[0025] (4) Place the slider of the spinal screw rod support structure into the groove of the base and adjust the horizontal position of the test sample so that the test sample and the load application fixture of the testing machine are aligned.

[0026] (5) Use bolts to lock the spinal nail rod support structure and base to completely fix the entire test fixture.

[0027] (6) The test specimen is brought into contact with the load-applying fixture of the testing machine, a preload is applied, and then the spinal screw-rod flexion-extension test is performed. The experimental method can be found in YYT 0119.1-2014.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Spinal screw rod flexion and extension test tool, characterized by: The invention comprises a spinal nail rod locking structure, a spinal nail rod supporting structure and a base, wherein two threaded holes connected to the testing machine are respectively provided on the front and rear sides of the base, a groove is provided in the middle of the base and along the length direction of the base, the spinal nail rod supporting structure is L-shaped, a slider is provided in the middle of the bottom wall of the horizontal support of the spinal nail rod supporting structure, the slider is installed in the groove and can slide along the groove, a plurality of threaded holes are spaced apart on the left and right sides of the bottom wall of the groove, an elongated hole is provided on the rear side of the horizontal support of the spinal nail rod supporting structure and a circular hole with an axis arranged in the vertical direction is provided on the front side of the horizontal support, the spinal nail rod supporting structure is fixedly connected to the base by bolts passing through the threaded holes on the elongated hole and the groove and by bolts passing through the threaded holes on the circular hole and the groove; The U-shaped grooves are arranged at intervals in the upper and lower parts on the right wall of the vertical support of the spinal nail rod supporting structure, and in order from top to bottom, a fixed end V-groove is opened from the outer wall to the inner side in the middle of the upper and lower side walls of the first U-shaped groove and the third U-shaped groove, and the upper and lower sides of the spinal nail rod arranged in the vertical direction are respectively clamped in the fixed end V-groove and fixed in the fixed end V-groove by the spinal nail rod locking structure. The spinal nail rod locking structure is fixedly connected to the spinal nail rod supporting structure. The two spinal nail rod locking structures each include a T-shaped block, and a movable end V-groove is opened in the middle of the horizontal end outer wall of the T-shaped block. The horizontal ends of the T-shaped blocks of the two spinal nail rod locking structures are respectively inserted into the first U-shaped groove and the third U-shaped groove, and the movable end V-groove is clamped on the spinal nail rod, and the vertical end of the T-shaped block is fixedly connected to the bolt holes opened on the bottom wall of the first U-shaped groove and the third U-shaped groove by bolts.

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