Device for testing axial pullout force of spinal screw

Abstract

The utility model discloses a spinal screw axial pullout force testing device, and particularly relates to the technical field of medical instruments, which comprises a rack, a working plate is fixedly arranged on one side of the rack, a pressing assembly is arranged at the top of the working plate, a support is fixedly arranged at the top of the rack, a rotating shaft is rotatably connected to the inner side of the support, and the rotating shaft is rotatably connected with the working plate. The rotating shaft penetrates through the support and extends to the front side of the support, a stepping motor is fixedly arranged on the front side of the support, the output end of the stepping motor is fixedly connected with the rotating shaft, a fixed wheel is fixedly arranged on the outer side of the rotating shaft, and a cable is fixedly arranged on the outer side of the fixed wheel. According to the utility model, through the arrangement of the pressing assembly, the function of improving the clamping stability of the test spine body is realized, so that the problem that the test result is influenced by the displacement of the test spine body in the test due to the insufficient clamping contact area of the test spine body during the axial pullout force test of the performance spine screw is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field more specifically, the utility model relates to a kind of axial pull-out force test device of spinal screw. BACKGROUND

[0002] Spinal screw axial pull-out force test device is widely used in biomedical engineering, medical instrument manufacturing, orthopedic surgery and other fields, for evaluating the mechanical properties, material quality and reliability of spinal screw and other aspects. Through testing, doctors can be provided with reliable screw performance data to help them choose more suitable screw types and specifications for patients, thereby improving the success rate and safety of surgery.

[0003] But in actual use, such as when spinal screw is subjected to axial pull-out force test, it is necessary to screw the spinal screw into the test spine body, and then the test spine body is fixed to carry out test test, but the fixation of test spine body is usually only fixed by two sides, and a certain looseness is prone to occur during pull-out force test, thereby affecting the test result. UTILITY MODEL CONTENT

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a kind of axial pull-out force test device of spinal screw to solve the problems raised in the above background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of axial pull-out force test device of spinal screw, including rack, the rack one side is fixed with work plate, the work plate top is equipped with pressing assembly, the rack top is fixed with support, the support inner side is rotatably connected with shaft, the shaft passes through support and extends to the front side of support, the support front side is fixed with step motor, the step motor output is fixedly connected with shaft, the shaft outer side is fixed with fixed wheel, the fixed wheel outer side is fixed with cable, the support one side is equipped with guide plate, the guide plate is fixedly connected with rack, the guide plate one side is fixed with two guide pulley groups, the cable one end is equipped with clamping assembly.

[0006] As a further description of the above technical solution:

[0007] The pressing assembly includes two positioning plates fixed on the top of the work plate, two support plates are fixed on the front side of each of the two positioning plates, two first air cylinders are hingedly connected to the rear side of each of the two positioning plates, a slope plate is hingedly connected to the output end of each first air cylinder, and the slope plate is hingedly connected to the positioning plate.

[0008] As a further description of the above technical solution:

[0009] The bottom of the inclined plate is fixed with a pressing plate, the bottom of the pressing plate is provided with a curved gusset plate, the bottom of each of the first air cylinders is provided with a second air cylinder, the output end of the second air cylinder is fixed with a pressing plate, and the front side of the pressing plate is fixed with an arc-shaped gusset plate.

[0010] As a further description of the above technical solution:

[0011] The clamping assembly comprises a connecting column arranged outside one end of the cable, a tension sensor fixed on one side of the connecting column, the tension sensor being fixedly connected with the cable, a connecting frame fixed on the bottom of the connecting column, and a plurality of first telescopic rods slidingly arranged in the connecting frame.

[0012] As a further description of the above technical solution:

[0013] The top of each of the first telescopic rods is fixedly connected with the connecting column, and each of the first telescopic rods is hingedly connected with a clamping rod.

[0014] As a further description of the above technical solution:

[0015] The bottom of the clamping rod is provided with a fan-shaped clamping plate, and the fan-shaped clamping plate is fixedly provided with a fan ring gusset plate.

[0016] As a further description of the above technical solution:

[0017] The connecting frame is hingedly connected with a plurality of small electric push rods, and the output end of each of the small electric push rods is hingedly connected with a fixing ring.

[0018] The technical effects and advantages of the utility model:

[0019] 1. By setting the pressing assembly, compared with the prior art, the test spine body is fixed on both sides and the top of the test spine body through the pressing plate and the pressing plate, so that the test spine body can be fixed to a greater extent, and the influence caused by the test can be reduced, so that the test result is more accurate.

[0020] 2. By setting the clamping assembly, compared with the prior art, the contact area of the clamping and the screw cap of the spinal screw is increased through the plurality of fan-shaped arc plates, the fan ring gusset plates and the screw cap of the spinal screw, so that the spinal screw can be more stable and not easy to fall off when being pulled out. DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of the utility model.

[0022] Figure 2 It is a working plate structure schematic view of the utility model.

[0023] Figure 3 It is a guide pulley block structure schematic view of the utility model.

[0024] Figure 4 This is a cross-sectional view of the connecting frame of this utility model.

[0025] Figure 5 This is a cross-sectional view of the bracket structure of this utility model.

[0026] The attached figures are labeled as follows: 1. Frame; 2. Working plate; 3. Support; 4. Rotating shaft; 5. Stepper motor; 6. Fixed wheel; 7. Cable; 8. Guide plate; 9. Guide pulley block; 10. Positioning plate; 11. Support plate; 12. First cylinder; 13. Inclined plate; 14. Pressing plate; 15. Curved pad; 16. Second cylinder; 17. Extrusion plate; 18. Arc-shaped pad; 19. Connecting column; 20. Tension sensor; 21. Connecting frame; 22. First telescopic rod; 23. Clamping rod; 24. Fan-shaped clamping plate; 25. Fan-shaped ring pad; 26. Small electric push rod; 27. Fixed ring. 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] As attached Figures 1-5 The spinal screw axial pull-out force testing device shown has a working plate 2 fixed on one side of the frame 1, a pressing component on the top of the working plate 2, a bracket 3 fixed on the top of the frame 1, a rotating shaft 4 rotatably connected to the inner side of the bracket 3, the rotating shaft 4 passing through the bracket 3 and extending to the front side of the bracket 3, a stepper motor 5 fixed on the front side of the bracket 3, the output end of the stepper motor 5 fixedly connected to the rotating shaft 4, a fixed wheel 6 fixed on the outer side of the rotating shaft 4, a cable 7 fixed on the outer side of the fixed wheel 6, a guide plate 8 on one side of the bracket 3, the guide plate 8 fixedly connected to the frame 1, two guide pulley groups 9 fixed on one side of the guide plate 8, and a clamping component at one end of the cable 7.

[0029] In some embodiments, according to Figure 2 As shown, the pressing assembly includes two positioning plates 10 fixed to the top of the working plate 2. Two support plates 11 are fixed to the front side of each positioning plate 10. Two first cylinders 12 are hinged to the rear side of each positioning plate 10. An inclined plate 13 is hinged to the output end of the first cylinder 12. The inclined plate 13 is hinged to the positioning plate 10. The first cylinder 12 can provide power to the pressing plate 17 and the curved pad 15. The curved pad 15 can increase the contact area between the pressing plate 17 and the test spine, thereby better fixing the test spine.

[0030] In some embodiments, according to Figure 2 As shown in the figure, the bottom of the inclined plate 13 is fixedly provided with a pressing plate 14, the bottom of the pressing plate 14 is provided with a curved pad 15, the bottom of each of the two first air cylinders 12 is provided with a second air cylinder 16, the output end of the second air cylinder 16 is fixedly provided with a pressing plate 17, the front side of the pressing plate 17 is fixedly provided with an arc-shaped pad 18, and the second air cylinder 16 can drive the pressing plate 17 to drive the arc-shaped pad 18 to clamp the test spine body on both sides, so that the arc-shaped pad 18 can protect and increase the friction of the test spine body, thereby stably clamping the test spine body.

[0031] In some embodiments, according to Figure 3 、 4 As shown in the figure, the clamping assembly comprises a connecting column 19 arranged outside one end of the cable 7, a tension sensor 20 fixedly arranged on one side of the connecting column 19, the tension sensor 20 being fixedly connected with the cable 7, a connecting frame 21 fixedly arranged at the bottom of the connecting column 19, and a plurality of first telescopic rods 22 slidably arranged in the inner side of the connecting frame 21.

[0032] In some embodiments, according to Figure 4 As shown in the figure, the top of each of the plurality of first telescopic rods 22 is fixedly connected with the connecting column 19, and each of the plurality of first telescopic rods 22 is hingedly connected with a clamping rod 23, so that the fan-shaped clamping plates 24 can be separated from each other, thereby ensuring accurate clamping of the fan-shaped clamping plates 24 on the spinal screw.

[0033] In some embodiments, according to Figure 4 As shown in the figure, the bottom of each of the plurality of first telescopic rods 22 is fixedly connected with the connecting column 19, and each of the plurality of first telescopic rods 22 is hingedly connected with a clamping rod 23, so that the fan-shaped clamping plates 24 can be separated from each other, thereby ensuring accurate clamping of the fan-shaped clamping plates 24 on the spinal screw.

[0034] In some embodiments, according to Figure 4 As shown in the figure, the outer side of the connecting frame 21 is hingedly connected with a plurality of small electric push rods 26, the output end of each of the plurality of small electric push rods 26 is hingedly connected with a fixing ring 27, and pulling the fixing ring 27 can make the small electric push rod 26 extend to the maximum length, so that the fixing ring 27 is fixedly arranged outside the plurality of fan-shaped clamping plates 24.

[0035] The working principle of the utility model is: combined with the description Figures 1-5As shown, first, the test spine body with fixed spine screw is placed on the workboard 2, then the step motor 5 is started to drive the rotating shaft 4 to rotate and drive the fixed wheel 6 to rotate, the fixed wheel 6 drives the cable 7 to work, the connecting column 19 is moved downward as a whole through the guiding effect of the guide pulley set 9, when the fan-shaped clamping plate 24 moves to the top of the spine screw, the fan-shaped clamping plate 24 is manually pulled to move downward, the fan-shaped clamping plate 24 drives the first telescopic rod 22 to extend when moving, then the nut of the spine screw is clamped by the fan-shaped clamping plate 24;

[0036] Then the small electric push rod 26 is started to drive the fixed ring 27 to move downward until the fixed ring 27 moves to the outside of the fan-shaped clamping plate 24, the fan ring pad plate 25 clamps the nut of the spine screw;

[0037] Then the test spine body is moved to the position directly below the cable 7 until the cable 7 is vertical, then the second air cylinder 16 is started to drive the extrusion plate 17 to drive the arc-shaped pad plate 18 to clamp the two sides of the test spine body, then the first air cylinder 12 is started to drive the inclined plate 13 to overturn so that the pressing plate 14 drives the curved pad plate 15 to press and fix the top of the test spine body, then the step motor 5 is started to make the cable 7 work upward, so that the fan-shaped clamping plate 24 moves upward as a whole, and the axial pull-out force test of the spine screw is completed.

[0038] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and not for limiting the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A spinal screw axial pull-out force testing device comprising a frame (1), characterized in that: The rack (1) is fixedly provided with a workboard (2) on one side, the workboard (2) is provided with a pressing assembly on the top, the rack (1) is fixedly provided with a support (3) on the top, the support (3) is rotatably connected with a rotating shaft (4) on the inner side, the rotating shaft (4) penetrates through the support (3) and extends to the front side of the support (3), the support (3) is fixedly provided with a stepping motor (5) on the front side, the output end of the stepping motor (5) is fixedly connected with the rotating shaft (4), the rotating shaft (4) is fixedly provided with a fixed wheel (6) on the outer side, the fixed wheel (6) is fixedly provided with a cable (7) on the outer side, the support (3) is provided with a guide plate (8) on one side, the guide plate (8) is fixedly connected with the rack (1), two guide pulley blocks (9) are fixedly provided on one side of the guide plate (8), and one end of the cable (7) is provided with a clamping assembly.

2. A spinal screw axial pull-out force testing device according to claim 1, wherein: The pressing assembly comprises two positioning plates (10) fixed on the top of the workboard (2), two supporting plates (11) are fixedly provided on the front side of each of the two positioning plates (10), two first air cylinders (12) are hingedly connected on the rear side of each of the two positioning plates (10), a slope plate (13) is hingedly connected to the output end of the first air cylinder (12), and the slope plate (13) is hingedly connected with the positioning plate (10).

3. A spinal screw axial pull-out force testing device according to claim 2, wherein: A pressing plate (14) is fixedly provided on the bottom of the slope plate (13), a curved pad plate (15) is arranged on the bottom of the pressing plate (14), a second air cylinder (16) is arranged on the bottom of each of the two first air cylinders (12), an extrusion plate (17) is fixedly provided on the output end of the second air cylinder (16), and an arc-shaped pad plate (18) is fixedly provided on the front side of the extrusion plate (17).

4. An axial pullout force testing device for a spinal screw as defined in claim 1, wherein: The clamping assembly comprises a connecting column (19) arranged on the outer side of one end of the cable (7), a tension sensor (20) is fixedly provided on one side of the connecting column (19), the tension sensor (20) is fixedly connected with the cable (7), a connecting frame (21) is fixedly provided on the bottom of the connecting column (19), and a plurality of first telescopic rods (22) are slidably arranged on the inner side of the connecting frame (21).

5. A spinal screw axial pull-out force testing device according to claim 4, wherein: The top of each of the plurality of first telescopic rods (22) is fixedly connected with the connecting column (19), and a clamping rod (23) is hingedly connected to one end of each of the plurality of first telescopic rods (22).

6. A spinal screw axial pull-out force testing device according to claim 5, wherein: A fan-shaped clamping plate (24) is arranged on the bottom of the clamping rod (23), and a fan ring pad plate (25) is fixedly provided on one side of the fan-shaped clamping plate (24).

7. A spinal screw axial pull-out force testing device according to claim 6, wherein: A plurality of small electric push rods (26) are hingedly connected to the outer side of the connecting frame (21), and a fixing ring (27) is hingedly connected to the output end of the small electric push rod (26).

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