Testing device and testing method for fixing strength of anchor with line

Abstract

The invention relates to the technical field of medical instruments, in particular to a device and method for testing the fixing strength of a wired anchor, and the device comprises a lower tool which comprises a sliding seat and two clamping assemblies, the two clamping assemblies are arranged on the sliding seat in a sliding manner, and the clamping assemblies move oppositely to clamp a test block; the test block is a polyurethane block, a through hole is formed in the test block, four groups of tendon ligament simulants vertically penetrate through the through hole, anchor nails with lines are fixed in the through hole, and the anchor nails with lines are screwed into or knocked into the through hole and extrude and fix the tendon ligament simulants; the upper tool comprises a box body and a balance assembly, the balance assembly is arranged in the box body, the lower end of the balance assembly is provided with a chuck for clamping a tendon ligament simulant, the lower tool clamps a test block for simulating a human skeleton, and the upper tool clamps the tendon ligament simulant located at the upper end of an anchor nail with a line in the test block; the problems that an independent anchor is difficult to clamp due to the appearance and clamping is prone to deformation due to the material strength of the anchor with the line are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and relates to a test device and a test method for the fixing strength of a suture - anchored button. Background Art

[0002] Suture - anchored buttons are widely used in orthopedic ligament repair or reconstruction surgeries. A suture - anchored button is an implantable medical device that connects damaged soft tissues to bone, and is widely used in many fields such as rotator cuff repair and elbow, knee, and wrist joint repairs. When soft tissue is torn from the bone and needs to be repaired, usually a surgeon uses a suture to repair the separated soft tissue, and the suture is connected to the bone through the button. After the button is implanted into the bone, the suture passes through the soft tissue that needs to be re - attached, and then the suture is fixed to the button with a certain tension. Therefore, the fixing strength of the suture - anchored button after being implanted into the bone is the key to determining the success or failure of the surgery.

[0003] However, there is currently no device or method for testing the fixing strength of suture - anchored buttons. Existing test methods all refer to the test method for axial pull - out force in the standard YY / T 1504 - 2016 "Test Method for Axial Pull - out Force of Metallic Bone Screw for Surgical Implants". However, this standard only targets metallic bone screws, and there are significant differences in material, structure, and usage method between suture - anchored buttons and metallic bone screws. Moreover, it is impossible to clamp and pull out a conventional single button fixed inside the bone, which increases the difficulty of testing. Therefore, it is urgent to study a device and method for testing the fixing strength performance of suture - anchored buttons. Summary of the Invention

[0004] The present invention provides a test device and a test method for the fixing strength of a suture - anchored button to solve the problems of the prior art.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A test device for the fixing strength of a suture - anchored button includes: a lower tooling, the lower tooling includes a fixed table, a lower pin, a sliding seat, and a clamping assembly. The lower pin is fixed to the lower end of the fixed table, and the lower pin is used to connect the lower end of a universal electronic testing machine. The sliding seat is fixed to the fixed table, and two groups of the clamping assemblies are slidably arranged on the sliding seat, and the clamping assemblies move towards each other to clamp a test block;

[0007] A test block, the test block is a polyurethane block, a through - hole is provided inside the test block, four groups of tendon and ligament analogs are vertically arranged in the through - hole, a suture - anchored button is fixed in the through - hole, and the suture - anchored button is screwed in or knocked into or knocked into the through - hole and presses and fixes the tendon and ligament analogs;

[0008] Upper tooling, the upper tooling includes a box body, an upper pin and a balance assembly. The upper pin is fixed to the upper end of the box body, and the upper pin is used to connect the upper end of a universal electronic testing machine. The balance assembly is arranged inside the box body, and a chuck for clamping a tendon and ligament simulator is provided at the lower end of the balance assembly.

[0009] Further improvement, the clamping assembly includes an L-shaped block, a clamping block and a driving mechanism. The lower end of the L-shaped block is slidably arranged on the sliding seat. The clamping block is fixed to the inner side of the L-shaped block. The driving mechanism includes a screw push rod and a limiting block. The limiting blocks are symmetrically and fixedly arranged on both sides of the top of the sliding seat. One end of the screw push rod is connected to the limiting block through an internal thread. A rotating part is arranged inside the screw push rod, and the rotating part is rotatably connected to one end of the L-shaped block. The L-shaped block is fixedly connected with a baffle plate, and the baffle plate is used to prevent the screw push rod from disengaging from the L-shaped block. The balance assembly includes a first movable pulley, a second movable pulley and a fixed pulley. The fixed pulley is rotatably arranged on a rotating shaft, and both ends of the rotating shaft are fixed inside the box body. A first balance rope is arranged in the inner groove of the first movable pulley. Both ends of the first balance rope pass through the box body and are connected to two groups of chucks on the left side. The two groups of chucks on the left side are connected to two groups of tendon and ligament simulators on the left side. The first movable pulley is rotatably arranged inside a first base. An adjusting wheel one is arranged at the upper end of the first base. A first guide rope is slidably arranged in the through hole of the first base. The lower end of the first guide rope is connected to a first retaining piece located below the through hole of the first base. The upper end of the first guide rope is wound around the fixed pulley. The adjusting wheel one is used to keep the first guide rope between the adjusting wheel one and the first base vertical. A second balance rope is arranged in the inner groove of the second movable pulley. Both ends of the second balance rope pass through the box body and are connected to two groups of chucks on the right side. The two groups of chucks on the right side are connected to two groups of tendon and ligament simulators on the right side. The second movable pulley is rotatably arranged inside a second base. An adjusting wheel two is arranged at the upper end of the second base. A second guide rope is slidably arranged in the through hole of the second base. The lower end of the second guide rope is connected to a second retaining piece located below the through hole of the second base. The upper end of the second guide rope is wound around the fixed pulley. The adjusting wheel two is used to keep the second guide rope between the adjusting wheel two and the second base vertical. The winding directions of the first guide rope wound around the fixed pulley and the second guide rope wound around the fixed pulley are arranged in the opposite direction.

[0010] Further improvement, a groove is provided in the center of the sliding seat, and the groove is located below the test block.

[0011] Further improvement, the L-shaped block includes sliders symmetrically bolted and fixed to the bottom of the L-shaped block. The sliders are slidably arranged in the sliding grooves of the sliding seat, and the lower end of the L-shaped block is arranged in contact with the end face of the sliding seat.

[0012] A testing method for a testing device of the fixing strength of a suture anchor includes the following steps:

[0013] S1: Connect the lower pin of the lower tooling and the upper pin of the upper tooling to the universal electronic testing machine respectively, so that neither the lower tooling nor the upper tooling will have vertical displacement and axial rotation;

[0014] S2: Process the polyurethane block of grade 20 that meets the standard ASTM F1839 into a test block of appropriate size, and then implant the suture anchor into the test block; the upper and lower surfaces of the test block should be smooth and parallel to ensure that after the suture anchor is implanted, the axis of the suture anchor is perpendicular to the upper surface of the test block. The length and width of the test block are more than 10 times the outer diameter of the suture anchor, and the thickness of the test block is more than 2 times the length of the suture anchor; drill a straight through-hole in the center of the test block, and the diameter of the through-hole is the same as the bottom diameter of the suture anchor. Use a special surgical instrument to implant the suture anchor and the tendon and ligament simulator into the test block, and the suture anchor needs to be completely immersed in the test block;

[0015] S3: Clamp the test block with the lower tooling, and clamp the extended end of the tendon and ligament simulator with the upper tooling. By adjusting the clamping position of the test block and the clamping position of the tendon and ligament simulator moved by the lower tooling, make the clamping center of the upper tooling and the center of the test block basically coincide axially;

[0016] S4: Fix the test block and the tendon and ligament simulator with the lower tooling and the upper tooling, and ensure that there is no slippage between the tendon and ligament simulator and the upper tooling during the pulling process;

[0017] S5: Before starting the test, it is necessary to ensure that the extended section of the tendon and ligament simulator is in a relaxed state, and the force sensor of the testing machine shows zero. Start the test, and the test rate is 1 - 20 mm / min. Record the maximum tensile force during the test process, test multiple groups of data, calculate the maximum tensile force value and conduct analysis.

[0018] Compared with the prior art, the beneficial effects of the testing device and testing method for the fixation strength of the suture anchor of the present invention are as follows:

[0019] 1. The lower tooling clamps the test block simulating the human bone, and the upper tooling clamps the upper end tendon and ligament simulator of the suture anchor located inside the test block. The suture anchor is placed inside the test block. Using the tendon and ligament simulator solves the problems of difficult clamping caused by the shape of the single anchor and easy deformation or fracture during clamping caused by the material strength of the suture anchor;

[0020] 2. The suture anchor placed inside the test block is closer to the actual use scenario of the suture anchor in the human body environment, and the test data is more representative;

[0021] 3. The clamping and fixing distance of the testing device is adjustable, and it can ensure the centering of the clamping center of the upper tooling and the test block. At the same time, it is applicable to suture anchors and test blocks of various sizes, and can meet various test objects;

[0022] 4. It can achieve the standardized test of the fixation strength of the suture anchor, reducing the errors caused by operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Structural schematic diagram of the present invention

[0024] Figure 2 Structural schematic diagram of the upper tooling in the present invention

[0025] Figure 3 is Figure 2 Structural schematic diagram of the internal right view

[0026] Figure 4 Structural schematic diagram of the lower tooling in the present invention

[0027] Figure 5 Structural schematic diagram of the connection between the lower tooling and the test block in the present invention

[0028] Figure 6 Structural schematic diagram of the inside of the test block in the present invention

[0029] In the figure, 1 - lower tooling, 11 - fixed table, 12 - pin, 13 - sliding seat, 131 - chute, 14 - clamping assembly, 141 - L-shaped block, 142 - clamping block, 143 - driving mechanism, 144 - screw push rod, 1441 - rotating part, 145 - limiting block, 146 - baffle, 147 - slider, 2 - upper tooling, 21 - box body, 22 - upper pin, 23 - balancing assembly, 231 - first movable pulley, 232 - second movable pulley, 233 - fixed pulley, 234 - first balancing rope, 235 - second balancing rope, 236 - first guide rope, 237 - second guide rope, 24 - chuck, 3 - test block, 31 - through hole, 5 - tendon and ligament simulator, 6 - suture anchor, 7 - groove, 91 - first base, 92 - second base, 93 - first adjusting wheel, 94 - second adjusting wheel, 95 - first retaining piece, 96 - second retaining piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The following combines the embodiments and the appended Figures 1 to 6 to further elaborate on the technical solutions of the present invention.

[0033] Embodiment 1

[0034] A test device for the fixing strength of a suture anchor, comprising:

[0035] A lower tooling 1, the lower tooling 1 includes a fixed table 11, a lower pin 12, a sliding seat 13, and a clamping assembly 14. The lower pin 12 is fixed to the lower end of the fixed table 11, and the lower pin 12 is used to connect to the lower end of a universal electronic testing machine. The sliding seat 13 is fixed to the fixed table 11, and two groups of the clamping assemblies 14 are slidably arranged on the sliding seat 13. The clamping assemblies 14 move towards each other to clamp the test block 3;

[0036] A test block 3, the test block 3 is a polyurethane block. A through hole 31 is provided inside the test block 3. Four groups of tendon and ligament analogs 5 are provided through the through hole 31 up and down. A suture anchor 6 is fixed in the through hole 31, and the suture anchor 6 is screwed in or knocked into or knocked into the through hole 31 and presses and fixes the tendon and ligament analog 5;

[0037] An upper tooling 2, the upper tooling 2 includes a box body 21, an upper pin 22, and a balancing assembly 23. The upper pin 22 is fixed to the upper end of the box body 21, and the upper pin 22 is used to connect to the upper end of a universal electronic testing machine. The balancing assembly 23 is arranged inside the box body 21, and a chuck 24 for clamping the tendon and ligament analog 5 is provided at the lower end of the balancing assembly 23.

[0038] A test method for a test device for the fixing strength of a suture anchor, comprising the following steps:

[0039] S1: Connect the lower pin 12 of the lower tooling 1 and the upper pin 22 of the upper tooling 2 to the universal electronic testing machine respectively, so that neither the lower tooling 1 nor the upper tooling 2 will have vertical displacement and axial rotation;

[0040] S2: Process a polyurethane block of grade 20 that meets the standard ASTM F1839 into a test block 3 of appropriate size (imitating human cancellous bone), and then implant the suture anchor 6 into the test block 3. The upper and lower surfaces of the test block 3 should be smooth and flat and parallel to each other to ensure that after the suture anchor 6 is implanted, the axis of the suture anchor 6 is perpendicular to the upper surface of the test block 3. The length and width of the test block 3 are greater than 10 times the outer diameter of the suture anchor 6, ensuring that the distance from the edge of the through-hole 31 to each edge of the test block 3 is 5 times the diameter, preventing the clamping of the test block 3 from squeezing the suture anchor 6 and affecting the results. The thickness of the test block 3 is greater than 2 times the length of the suture anchor 6, ensuring that the suture anchor 6 can be completely implanted into the test block 3 and the suture anchor 6 can provide sufficient frictional force to the suture anchor 6. Drill a straight through-hole 31 in the center of the test block 3, and the diameter of the through-hole 31 is the same as the bottom diameter of the suture anchor 6. Use a special surgical instrument to implant the suture anchor 6 and the tendon and ligament simulator 5 into the test block 3, and the suture anchor 6 needs to be completely immersed in the test block 3.

[0041] S3: Clamp the test block 3 by the lower tooling 1 and clamp the extended end of the tendon and ligament simulator 5 by the upper tooling 2. By adjusting the clamping position of the test block 3 and the clamping position of the tendon and ligament simulator 5 by moving the lower tooling 1, make the clamping center of the upper tooling 2 and the center of the test block 3 basically coincide axially.

[0042] S4: Fix the test block 3 and the tendon and ligament simulator 5 by the lower tooling 1 and the upper tooling 2, and ensure that the tendon and ligament simulator 5 does not slip relative to the upper tooling 2 during the pulling process.

[0043] Before starting the test, it is necessary to ensure that the extended section of the tendon and ligament simulator 5 is in a relaxed state and the force sensor of the testing machine shows zero. Start the test, with a test rate of 1 - 20 mm / min, record the maximum tensile force during the test process, test multiple groups of data, calculate the maximum tensile force value and conduct analysis.

[0044] The present invention provides a testing device and a testing method for the fixation strength of a suture anchor. First, implant the suture anchor to be tested and the tendon and ligament simulator into the test block through a surgical instrument. The test block is made of a grade 20 polyurethane block that meets the standard ASTM F1839 (imitating human cancellous bone) according to the applicable part of the suture anchor. Clamp the test block implanted with the suture anchor and the tendon and ligament simulator by the lower tooling, clamp the extended end of the tendon and ligament simulator by the upper tooling, and pull the upper tooling by a universal material testing machine until the suture anchor or the tendon and ligament simulator is pulled out of the test block. This method can measure the fixation strength of the suture anchor, obtain the force-displacement curve during the test through a universal material testing machine, obtain the displacement-load diagram, and obtain the maximum value, thereby testing the fixation strength value of the suture anchor.

[0045] The beneficial effects of the present invention are:

[0046] 1. The lower tooling clamps a test block that simulates the human bone, and the upper tooling clamps the upper tendon and ligament simulator of the suture anchor located inside the test block. The suture anchor is built into the test block. The use of the tendon and ligament simulator solves the problems of difficult clamping caused by the shape of a single anchor and easy deformation or fracture during clamping caused by the material strength of the suture anchor.

[0047] 2. The suture anchor built into the test block is closer to the actual usage scenario of the suture anchor in the human body environment, and the test data is more representative.

[0048] 3. The clamping and fixing distance of the test device is adjustable, and it can ensure the centering of the clamping center of the upper tooling and the test block. At the same time, it is applicable to suture anchors and test blocks of various sizes, and can meet a variety of test objects.

[0049] 4. It can realize the standardized test of the fixing strength of the suture anchor and reduce the errors caused by operation.

[0050] As a further preferred embodiment, the clamping assembly 14 includes an L-shaped block 141, a clamping block 142 and a driving mechanism 143. The lower end of the L-shaped block 141 is slidably arranged on the sliding seat 13. The clamping block 142 is fixed to the inner side of the L-shaped block 141. The driving mechanism 143 includes a screw push rod 144 and a limiting block 145. The limiting blocks 145 are symmetrically and fixedly arranged on both sides of the top of the sliding seat 13. One end of the screw push rod 144 is connected to the limiting block 145 through internal threads. A rotating part 1441 is arranged inside the screw push rod 144. The rotating part 1441 is rotatably connected to one end of the L-shaped block 141. The L-shaped block 141 is fixedly connected with a baffle 146. The baffle 146 is used to prevent the screw push rod 144 from disengaging from the L-shaped block 141.

[0051] When it is necessary to adjust the position of the test block 3 or clamp it, the screw push rod 144 is rotated to drive the L-shaped block 141 and the clamping block 142 to move on the sliding seat 13. At the same time, the two clamping assemblies 14 are adjusted so that the inner test block 3 can be clamped and the clamping position can be corrected, ensuring that the clamping center of the upper tooling 2 and the center of the test block 3 are basically axially coincident. The adjustment method is simple and efficient.

[0052] The balance component 23 includes a first movable pulley 231, a second movable pulley 232 and a fixed pulley 233. The fixed pulley 233 is rotatably arranged on a rotating shaft, and both ends of the rotating shaft are fixed inside the box body 21. A first balance rope 234 is arranged in the inner groove of the first movable pulley 231. Both ends of the first balance rope 234 pass through the box body 21 and are connected to two groups of chucks 24 on the left side. The two groups of chucks 24 on the left side are connected to two groups of tendon and ligament simulators 5 on the left side. The first movable pulley 231 is rotatably arranged in a first base 91. An adjusting wheel 93 is arranged at the upper end of the first base 91. A first guide rope 236 is slidably arranged in the through hole of the first base 91. The lower end of the first guide rope 236 is connected to a first retaining piece 95 located below the through hole of the first base 91. The upper end of the first guide rope 236 is wound around the fixed pulley 233. The adjusting wheel 93 is used to keep the first guide rope 236 between the adjusting wheel 93 and the first base 91 vertical. A second balance rope 235 is arranged in the inner groove of the second movable pulley 232. Both ends of the second balance rope 235 pass through the box body 21 and are connected to two groups of chucks 24 on the right side. The two groups of chucks 24 on the right side are connected to two groups of tendon and ligament simulators 5 on the right side. The second movable pulley 232 is rotatably arranged in a second base 92. An adjusting wheel 94 is arranged at the upper end of the second base 92. A second guide rope 237 is slidably arranged in the through hole of the second base 92. The lower end of the second guide rope 237 is connected to a second retaining piece 96 located below the through hole of the second base 92. The upper end of the second guide rope 237 is wound around the fixed pulley 233. The adjusting wheel 94 is used to keep the second guide rope 237 between the adjusting wheel 94 and the second base 92 vertical. The winding direction of the first guide rope 236 wound around the fixed pulley 233 is opposite to the winding direction of the second guide rope 237 wound around the fixed pulley 233.

[0053] When the four groups of tendon and ligament simulators 5 are pulled separately, the pulling force of each group of tendon and ligament simulators 5 may be different, which may affect the test results. The balance component 23 can automatically correct the pulling forces on the four groups of tendon and ligament simulators 5 to make the pulling forces on each group of tendon and ligament simulators 5 the same.

[0054] Before correction, the pulling force of the left front tendon and ligament simulator 5 is a, the pulling force of the left rear tendon and ligament simulator 5 is b, the pulling force of the right front tendon and ligament simulator 5 is c, and the pulling force of the right rear tendon and ligament simulator 5 is d.

[0055] Since the two sets of tendon and ligament mimics 5 on the left side are connected by a balance rope 234 on a movable pulley 231, the movable pulley 231 can automatically rotate according to the magnitude of the pulling force, and thus the pulling forces on the two sets of tendon and ligament mimics 5 on the left side both become (a + b) / 2; similarly, the pulling forces on the two sets of tendon and ligament mimics 5 on the right side both become (c + d) / 2. Since the movable pulley 231 and the movable pulley 232 are both suspended, the movable pulley 231 is connected to the fixed pulley 233 through a guide rope 236, and the movable pulley 232 is connected to the fixed pulley 233 through a guide rope 237. Since the movable pulleys and the ropes on the left and right sides are symmetrically arranged, the weights except for the pulling force of the lower tendon and ligament mimic 5 are equal. When the sum of the pulling forces a + b on the left side is less than the sum of the pulling forces c + d on the right side, as Figure 3 shown, the upper fixed pulley 233 rotates clockwise, thereby winding the guide rope 236 to increase the pulling force of the left movable pulley 231 and loosening the guide rope 237 to reduce the pulling force of the right movable pulley 232. After the fixed pulley 233 rotates to a stable state, the pulling force of each set of tendon and ligament mimics 5 becomes (a + b + c + d) / 2, thereby balancing the entire pulling force. When the testing machine drives the upper tooling 2 upward, the balance assembly 23 inside the upper tooling 2 will make an adaptive adjustment to ensure that the pulling forces of each set of tendon and ligament mimics 5 are equal.

[0056] As a further preferred embodiment, a groove 7 is provided in the center of the slide base 13, and the groove 7 is located below the test block 3. The groove 7 in the center of the slide base 13 is a hollow structure, which facilitates the free hanging of the tendon and ligament mimics 5 to prevent jamming of the sliding clamping assembly 14.

[0057] As a further preferred embodiment, the L-shaped block 141 includes sliders 147 symmetrically bolted and fixed to the bottom of the L-shaped block 141. The sliders 147 are slidably arranged in the sliding grooves 131 of the slide base 13, and the lower end of the L-shaped block 141 is attached to the end face of the slide base 13. The sliders 147 detachably connected by bolts enable the L-shaped block 141 to slide on the slide base 13, facilitating connection and installation.

[0058] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A test device for the fixing strength of a suture anchor, characterized in that, Comprising: Lower tooling, the lower tooling includes a fixed table, a lower pin, a sliding seat and a clamping assembly. The lower pin is fixed to the lower end of the fixed table, and the lower pin is used to connect the lower end of a universal electronic testing machine. The sliding seat is fixed to the fixed table, and two groups of the clamping assemblies are slidably arranged on the sliding seat, and the clamping assemblies move towards each other to clamp the test block; Test block, the test block is a polyurethane block, and through holes are provided inside the test block. Four groups of tendon and ligament analogs are arranged vertically through the through holes. A suture anchor is fixed in the through hole, and the suture anchor is screwed or knocked into the through hole to press and fix the tendon and ligament analogs; Upper tooling, the upper tooling includes a box body, an upper pin and a balance assembly. The upper pin is fixed to the upper end of the box body, and the upper pin is used to connect the upper end of a universal electronic testing machine. The balance assembly is arranged inside the box body, and a chuck for clamping the tendon and ligament analogs is provided at the lower end of the balance assembly.

2. A test device for the fixation strength of a suture anchor according to claim 1, wherein The clamping assembly includes an L-shaped block, a clamping block and a driving mechanism. The lower end of the L-shaped block is slidably arranged on the sliding seat, the clamping block is fixed to the inner side of the L-shaped block, the driving mechanism includes a screw push rod and a limit block. The limit blocks are symmetrically and fixed on both sides of the top of the sliding seat. One end of the screw push rod is connected to the limit block through an internal thread. A rotating part is provided inside the screw push rod, and the rotating part is rotatably connected to one end of the L-shaped block. The L-shaped block is fixedly connected with a baffle, and the baffle is used to prevent the screw push rod from coming out of the L-shaped block; The balance assembly includes a first movable pulley, a second movable pulley and a fixed pulley. The fixed pulley is rotatably arranged on a rotating shaft, and both ends of the rotating shaft are fixed inside the box body; A first balance rope is arranged in the inner groove of the first movable pulley. Both ends of the first balance rope pass through the box body and are connected to two groups of chucks on the left side. The two groups of chucks on the left side are connected to two groups of tendon and ligament analogs on the left side. The first movable pulley is rotatably arranged in a first base. An adjusting wheel one is provided at the upper end of the first base. A first guide rope is slidably arranged in the through hole of the first base. The lower end of the first guide rope is connected to a first stop piece located below the through hole of the first base. The upper end of the first guide rope is wound around the fixed pulley. The adjusting wheel one is used to keep the first guide rope between the adjusting wheel one and the first base vertical; A second balance rope is arranged in the inner groove of the second movable pulley. Both ends of the second balance rope pass through the box body and are connected to two groups of chucks on the right side. The two groups of chucks on the right side are connected to two groups of tendon and ligament analogs on the right side. The second movable pulley is rotatably arranged in a second base. An adjusting wheel two is provided at the upper end of the second base. A second guide rope is slidably arranged in the through hole of the second base. The lower end of the second guide rope is connected to a second stop piece located below the through hole of the second base. The upper end of the second guide rope is wound around the fixed pulley. The adjusting wheel two is used to keep the second guide rope between the adjusting wheel two and the second base vertical; The winding direction of the first guide rope wound on the fixed pulley is opposite to the winding direction of the second guide rope wound on the fixed pulley.

3. The test device for the fixing strength of a wire - attached anchor according to claim 2, wherein, A groove is provided in the center of the sliding seat, and the groove is located below the test block.

4. The testing device for the fixing strength of a wire - carrying anchor bolt according to claim 2, wherein, The L-shaped block includes sliders symmetrically bolted and fixed to the bottom of the L-shaped block. The sliders are slidably arranged in the sliding grooves of the sliding seat, and the lower end of the L-shaped block is in contact with the end face of the sliding seat.

5. The testing method of a testing device for the fixing strength of a suture - attached anchor, according to claim 1, is characterized in that, Including the following steps: S1: Connect the lower pins of the lower tooling and the upper pins of the upper tooling to the universal electronic testing machine respectively, so that neither the lower tooling nor the upper tooling will have vertical displacement and axial rotation; S2: Process the polyurethane blocks of grade 20 that meet the standard ASTM F1839 into test blocks of appropriate size, and then implant the suture-anchors into the test blocks; the upper and lower surfaces of the test blocks should be smooth and flat and parallel to each other to ensure that after the suture-anchors are implanted, the axis of the suture-anchors is perpendicular to the upper surface of the test blocks. The length and width of the test blocks are greater than 10 times the outer diameter of the suture-anchors, and the thickness of the test blocks is greater than 2 times the length of the suture-anchors; drill a straight through-hole in the center of the test blocks, and the diameter of the through-hole is the same as the bottom diameter of the suture-anchors. Use special surgical instruments to implant the suture-anchors and tendon and ligament mimics into the test blocks, and the suture-anchors need to be completely immersed in the test blocks; S3: Clamp the test blocks with the lower tooling, and clamp the extended end of the tendon and ligament mimic with the upper tooling. By adjusting the clamping position of the test blocks and the clamping position of the tendon and ligament mimic by moving the lower tooling, make the clamping center of the upper tooling and the center of the test blocks basically coincide axially; S4: Fix the test blocks and the tendon and ligament mimics with the lower tooling and the upper tooling, and ensure that there is no slippage between the tendon and ligament mimic and the upper tooling during the pulling process; S5: Before starting the test, ensure that the extended section of the tendon and ligament mimic is in a relaxed state, and the force sensor of the testing machine shows zero. Start the test, and the test rate is 1 - 20 mm / min. Record the maximum tensile force during the test process, test multiple groups of data, calculate the maximum tensile force value and conduct analysis.

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