Lumbar spondylolisthesis repositor

Abstract

Relates to the field of medical equipment, and discloses a lumbar spondylolisthesis repositor which comprises a forceps handle and further comprises a supporting plate arranged at one end of the forceps handle and used for supporting an end plate of a vertebral body; the supporting plate comprises a first abutting plate and a second abutting plate, wherein the first abutting plate is arranged on the forceps handle; the second abutting plate is arranged on the clamp handle and is the same as the first abutting plate in shape; the balls are arranged on the side, away from the first abutting plate, of the second abutting plate; the adjusting device is arranged on the side, away from the first abutting plate, of the second abutting plate and used for adjusting the extending distance of the ball in the second abutting plate, then the displaced cone is lifted to reset through a lifting rod, and in the moving process of the slipping cone, the slipping cone can be reset through rolling contact of the ball, so that the slipping cone is prevented from slipping off. The resistance of slipping reduction can be reduced, the shearing force of lifting the pedicle screw to the vertebral body is reduced, and the vertebral body reduction operation failure caused by loosening of the pedicle screw is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and specifically to a lumbar vertebral spondylolisthesis reducer. Background Art

[0002] In spinal surgery, intervertebral spondylolisthesis is a common spinal disease, usually requiring surgical reduction and fixation. With the continuous progress of medical technology, various auxiliary surgical instruments have emerged, aiming to improve the accuracy and safety of surgery. The vertebral endplate is the hardest part of the vertebra. The intervertebral spondylolisthesis reducer exerts force on the endplate to expand the intervertebral space, and the instrument lifts and reduces the spondylolisthetic vertebra, and then reduces the spondylolisthesis.

[0003] Existing devices have the following disadvantages: Traditional vertebral reduction methods mostly rely on doctors' experience and manual operations, which not only require extremely high skills from doctors, but also have a high surgical risk, and it is difficult to guarantee the reduction effect. For spondylolisthesis reduction, it is mostly necessary to lift and reduce through pedicle screws after releasing the surrounding tissues and structures. Most elderly patients have osteoporosis, and the strength of pedicle screws is poor, which is likely to cause spondylolisthesis reduction failure and screw loosening.

[0004] Therefore, the present application now proposes a lumbar vertebral spondylolisthesis reducer to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a lumbar vertebral spondylolisthesis reducer to solve the problems of poor strength of pedicle screws, which are likely to cause spondylolisthesis reduction failure and screw loosening.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A lumbar vertebral spondylolisthesis reducer, including a pair of forceps handles, further including:

[0007] A support plate, arranged at one end of the pair of forceps handles, for supporting the endplate of the vertebra;

[0008] The support plate includes:

[0009] A first abutting plate, arranged on the pair of forceps handles;

[0010] A second abutting plate, arranged on the pair of forceps handles and having the same shape as the first abutting plate;

[0011] A ball, arranged on the side of the second abutting plate away from the first abutting plate;

[0012] An adjusting device, arranged on the side of the second abutting plate away from the first abutting plate, for adjusting the distance that the ball extends out of the second abutting plate.

[0013] Among them, the pliers handle includes a second handle, a rotating shaft arranged in the middle of the second handle, and a first handle sleeved on the rotating shaft. A first connecting rod is rotatably arranged on one side of the first handle, a second connecting rod is rotatably arranged on one side of the second handle, the first connecting rod and the second connecting rod are connected by a rotating rod, the first abutting plate is fixedly connected to the first connecting rod, and the second abutting plate is fixedly connected to the second connecting rod.

[0014] Among them, a rack is rotatably arranged on one side of the first handle away from the first connecting rod, a tooth is fixed on one side of the second handle away from the second connecting rod, and the tooth is snap-fitted and fixed in the tooth groove of the rack.

[0015] Among them, a spreading plate is fixedly arranged on one side of each of the first abutting plate and the second abutting plate away from the pliers handle, and wear-resistant particles are fixed on the outer side of the spreading plate.

[0016] Among them, the adjusting device includes a moving plate adjustably arranged on the second abutting plate, a second elastic member arranged between the second abutting plate and the moving plate, and an adjusting mechanism arranged on the second abutting plate and connected to the moving plate for adjusting the installation position of the moving plate. An installation groove for the moving plate to move is formed on the second abutting plate.

[0017] Among them, a through hole for the ball to move is formed at the position of the moving plate corresponding to the ball.

[0018] Among them, the adjusting mechanism includes a fixing plate fixed on the second connecting rod, a screw rod threadedly connected to the fixing plate, a rotating block fixed on the side of the screw rod away from the second abutting plate, and a connecting plate rotatably connected to the other side of the screw rod. A traction rope is arranged between the connecting plate and the moving plate, and a moving groove for the traction rope to move is formed on the second abutting plate.

[0019] Among them, an empty groove for the ball to rotate is formed on the second abutting plate.

[0020] Among them, a first elastic member is arranged between the first handle and the second handle.

[0021] Among them, anti-slip particles are arranged on one side of the first abutting plate away from the second abutting plate.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] In the present invention, the support plate of the lumbar spondylolisthesis reducer is inserted into the intervertebral space of the lumbar spondylolisthesis segment, and the second abutting plate is connected to the spondylolisthetic vertebra. Then, the forceps handle is pressed to open the first abutting plate and the second abutting plate, and the distance between the first abutting plate and the second abutting plate is adjusted to make the distance between the first abutting plate and the second abutting plate reach the width required for the intervertebral space distraction surgery. The vertebra is distracted. At this time, the opening angle of the forceps handle is fixed, and the distance between the distraction heads is also fixed. The adjusting device is rotated to make the balls protrude from the inside of the second abutting plate and contact the vertebral end plate of the spondylolisthetic vertebra. Then, through the lifting rod, the displaced vertebra is lifted to be reduced. During the movement of the spondylolisthetic vertebra, the resistance of the spondylolisthesis reduction can be reduced by the rolling contact of the balls, the shearing force of the pedicle screw on the vertebra can be reduced, and the failure of the vertebral reduction operation caused by the loosening of the pedicle screw can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the main structure in an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the structure in a top view in an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the structure in a front view in an embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of the sectional view of the support plate in an embodiment of the present invention;

[0028] Figure 5 is a schematic diagram of the exploded structure in an embodiment of the present invention;

[0029] Figure 6 is a schematic diagram of the structure of the connection between the second abutting plate and the adjusting device in an embodiment of the present invention;

[0030] Figure 7 is a schematic diagram of the structure of the connection between the ball and the second abutting plate in an embodiment of the present invention;

[0031] Figure 8 is a schematic diagram of the structure of the second abutting plate in an embodiment of the present invention.

[0032] In the figure: 1. Plier handle; 11. First handle; 111. Rack; 112. First connecting rod; 12. Second handle; 121. Teeth; 122. Second connecting rod; 13. First elastic member; 14. Rotating shaft; 15. Rotating rod; 2. Support plate; 21. First abutting plate; 22. Second abutting plate; 2201. Empty groove; 2202. Installation groove; 2203. Moving groove; 23. Expanding plate; 231. Wear-resistant particles; 24. Ball; 25. Anti-slip particles; 3. Adjusting device; 31. Fixed plate; 32. Screw; 33. Connecting plate; 34. Rotating block; 35. Traction rope; 36. Moving plate; 3601. Perforation; 37. Second elastic member. Specific embodiments

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1-8 , the present invention provides a technical solution: a lumbar vertebral spondylolisthesis reducer, including a plier handle 1, and further including:

[0035] A support plate 2, arranged at one end of the plier handle 1, for supporting the end plate of the vertebral body;

[0036] The support plate 2 includes:

[0037] A first abutting plate 21, arranged on the plier handle 1;

[0038] A second abutting plate 22, arranged on the plier handle 1 and having the same shape as the first abutting plate 21;

[0039] A ball 24, arranged on the side of the second abutting plate 22 away from the first abutting plate 21;

[0040] An adjusting device 3, arranged on the side of the second abutting plate 22 away from the first abutting plate 21, for adjusting the distance that the ball 24 extends out in the second abutting plate 22.

[0041] It should be noted that during operation, the support plate 2 of the lumbar spondylolisthesis reducer is inserted into the intervertebral space of the lumbar spondylolisthesis segment, and the second abutting plate 22 is connected to the slipped vertebra. Then, the pliers handle 1 is pressed to open the first abutting plate 21 and the second abutting plate 22, and the distance between the first abutting plate 21 and the second abutting plate 22 is adjusted to make the distance between the first abutting plate 21 and the second abutting plate 22 reach the width required for the intervertebral space distraction surgery. The vertebra is distracted. At this time, the opening angle of the pliers handle 1 is fixed, and the distance between the opening heads is also fixed. The adjusting device 3 is rotated to make the ball 24 protrude from the inside of the second abutting plate 22 and contact the vertebral end plate of the slipped vertebra. Then, through the lifting rod, the displaced vertebra is lifted to be reset. During the movement of the slipped vertebra, the rolling contact through the ball 24 can reduce the resistance of the spondylolisthesis reduction, reduce the shear force of the pedicle screw on the vertebra, and prevent the loosening of the pedicle screw, resulting in the failure of the vertebral reduction operation.

[0042] In one embodiment, the pliers handle 1 includes a second handle 12, a rotating shaft 14 arranged in the middle of the second handle 12, and a first handle 11 sleeved on the rotating shaft 14. A first connecting rod 112 is rotatably arranged on one side of the first handle 11, and a second connecting rod 122 is rotatably arranged on one side of the second handle 12. The first connecting rod 112 and the second connecting rod 122 are connected by a rotating rod 15. The first abutting plate 21 is fixedly connected to the first connecting rod 112, and the second abutting plate 22 is fixedly connected to the second connecting rod 122.

[0043] With such a design, referring to Figure 1-5 , since the first handle 11 and the second handle 12 are respectively rotatably arranged on the rotating shaft 14, the first handle 11 and the second handle 12 are pressed to rotate along the rotating shaft 14. Then, the first connecting rod 112 and the second connecting rod 122 are connected by the scissor-shaped rotating rod 15. Thus, under the drive of the first handle 11 and the second handle 12, the first abutting plate 21 and the second abutting plate 22 can be opened, so that the adjacent vertebrae can be distracted. The first abutting plate 21 is fixedly connected to the first connecting rod 112, and the second abutting plate 22 is fixedly connected to the second connecting rod 122. This design ensures the stability of the support plate 2 during the operation.

[0044] In one embodiment, a rack 111 is rotatably arranged on the side of the first handle 11 away from the first connecting rod 112, and a tooth 121 is fixed on the side of the second handle 12 away from the second connecting rod 122. The tooth 121 is snap-fitted into the tooth groove of the rack 111.

[0045] With such a design, referring to Figure 1-2 and Figure 5, through the clamping and fixing of the rack 111 and the teeth 121, the connection between the first handle 11 and the second handle 12 is more stable. This mechanical fixing method can effectively prevent the handles from sliding or rotating under external forces, thereby improving the stability and reliability of the entire structure. Since the rack 111 can rotate while the teeth 121 are fixed, the positions between adjacent vertebral bodies can be adjusted by rotating the first handle 11 and the second handle 12. After the distance between the first abutting plate 21 and the second abutting plate 22 is adjusted, the rack 111 is clamped and fixed on the teeth 121, making the adjustment and locking process of the first handle 11 and the second handle 12 simple and fast, improving the convenience of use.

[0046] In one embodiment, on the sides of the first abutting plate 21 and the second abutting plate 22 away from the pliers handle 1, spreading plates 23 are fixedly arranged, and wear-resistant particles 231 are fixed on the outer sides of the spreading plates 23.

[0047] With such a design, referring to Figure 8 , the wear-resistant particles 231 on the spreading plates 23 can increase the frictional force between the spreading plates 23 and the end plates, prevent the end plates from sliding or falling off when the vertebral bodies are propped up, and improve the success rate of vertebral body reduction.

[0048] In one embodiment, the adjusting device 3 includes a moving plate 36 adjustably arranged on the second abutting plate 22, a second elastic member 37 arranged between the second abutting plate 22 and the moving plate 36, and an adjusting mechanism arranged on the second abutting plate 22 and connected to the moving plate 36 for adjusting the installation position of the moving plate 36. An installation groove 2202 for the moving plate 36 to move is formed on the second abutting plate 22, and the second elastic member 37 is made of a spring or an elastic pad with damping.

[0049] With such a design, referring to Figure 6-8 , rotate the adjusting mechanism to adjust the installation position of the moving plate 36, then make the moving plate 36 move towards the inside of the installation groove 2202, then squeeze the second elastic member 37, and then the ball 24 extends out from the inside of the moving plate 36 and contacts the vertebral body, making the vertebral body slidably connected to the ball 24, reducing the resistance when the loose vertebral body moves.

[0050] In one embodiment, a perforation 3601 for the ball 24 to move is formed at the position of the moving plate 36 corresponding to the ball 24.

[0051] With such a design, referring to Figure 6-8 , the ball 24 moves on the moving plate 36 through the perforation 3601. Due to the rolling characteristics of the ball 24, compared with sliding friction, the resistance of rolling friction is smaller, which helps to reduce energy loss and improve the motion efficiency of the system.

[0052] In one embodiment, the adjusting mechanism includes a fixing plate 31 fixed on the second connecting rod 122, a screw rod 32 threadedly connected to the fixing plate 31, a rotating block 34 fixed on the side of the screw rod 32 away from the second abutting plate 22, and a connecting plate 33 rotatably connected to the other side of the screw rod 32. A traction rope 35 is arranged between the connecting plate 33 and the moving plate 36, and a moving groove 2203 for the traction rope 35 to move is formed on the second abutting plate 22.

[0053] With such a design, referring to Figure 1-8 , by rotating the rotating block 34, the screw rod 32 can be driven to move in the thread of the fixing plate 31, thereby achieving precise adjustment. The connecting plate 33 and the moving plate 36 are connected by the traction rope 35. The connecting plate 33 drives the moving plate 36 to move inside the installation groove 2202 through the traction rope 35. The moving groove 2203 formed on the second abutting plate 22 for the traction rope 35 to move provides a necessary channel for the traction rope 35, enabling it to move smoothly in a complex environment, thus ensuring the normal operation of the adjusting mechanism.

[0054] In one embodiment, an empty groove 2201 for the ball 24 to rotate is formed on the second abutting plate 22.

[0055] With such a design, referring to Figure 7 , the ball 24 rotates in the empty groove 2201, converting the original sliding friction into rolling friction. The coefficient of rolling friction is much lower than that of sliding friction. Therefore, it can significantly reduce the frictional resistance, reduce wear, and thus extend the service life of the second abutting plate 22 and the ball 24.

[0056] In one embodiment, a first elastic member 13 is arranged between the first handle 11 and the second handle 12.

[0057] With such a design, referring to Figure 1-2 、and Figure 5 , the first elastic member 13 can provide a buffering effect between the two handles, absorb and disperse the impact force, thereby reducing the vibration and impact during use, and improving the stability and durability of the device.

[0058] In one embodiment, anti-slip particles 25 are arranged on the side of the first abutting plate 21 away from the second abutting plate 22.

[0059] With such a design, referring to Figure 4 , the anti-slip particles 25 can increase the friction coefficient between the first abutting plate 21 and the contact surface of the vertebral body, thereby effectively preventing sliding or displacement. The enhanced friction makes the device or tool more stable and reliable during use, reducing the risk of operation errors or accidents caused by sliding or displacement.

[0060] In addition, if the description involves "first", "second", etc. in the embodiments, such descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance to the specification or the number of technical features implicitly specified. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one such feature.

Claims

1. A lumbar vertebral body slip reduction device, comprising a clamp handle (1), characterized in that: Also includes: A support plate (2) is arranged at one end of the clamp handle (1) and is used to support the end plate of the vertebral body; The support plate (2) comprises: A first abutment plate (21) is arranged on the clamp handle (1); A second abutment plate (22) is arranged on the pliers handle (1) and has the same shape as the first abutment plate (21); A ball (24) is arranged on a side of the second abutment plate (22) away from the first abutment plate (21); An adjusting device (3) is arranged on a side of the second abutting plate (22) away from the first abutting plate (21) and is used to adjust the distance that the ball (24) extends out of the second abutting plate (22).

2. The lumbar vertebral body slip reduction device according to claim 1, characterized in that: The pliers handle (1) comprises a second handle (12), a rotating shaft (14) arranged in the middle of the second handle (12), and a first handle (11) sleeved on the rotating shaft (14); a first connecting rod (112) is rotatably arranged on one side of the first handle (11); a second connecting rod (122) is rotatably arranged on one side of the second handle (12); the first connecting rod (112) and the second connecting rod (122) are connected via a rotating rod (15); the first abutment plate (21) is fixedly connected to the first connecting rod (112); and the second abutment plate (22) is fixedly connected to the second connecting rod (122).

3. The lumbar vertebral body slip reduction device according to claim 2, characterized in that: A rack (111) is rotatably provided on a side of the first handle (11) away from the first connecting rod (112), and teeth (121) are fixed on a side of the second handle (12) away from the second connecting rod (122), wherein the teeth (121) are snap-fitted and fixed in tooth grooves of the rack (111).

4. The lumbar vertebral body slip reduction device according to claim 2, characterized in that: A support plate (23) is fixedly provided on one side of the first abutment plate (21) and the second abutment plate (22) away from the clamp handle (1), and wear-resistant particles (231) are fixed on the outer side of the support plate (23).

5. The lumbar vertebral body slip reduction device according to claim 2, characterized in that: The adjusting device (3) comprises a movable plate (36) adjustably arranged on the second abutting plate (22), a second elastic member (37) arranged between the second abutting plate (22) and the movable plate (36), and an adjusting mechanism arranged on the second abutting plate (22) and connected to the movable plate (36) for adjusting the installation position of the movable plate (36); the second abutting plate (22) is provided with an installation groove (2202) for the movable plate (36) to move.

6. The lumbar vertebral body slip reduction device according to claim 5, characterized in that: The movable plate (36) is provided with a through hole (3601) at a position corresponding to the rolling ball (24) for the rolling ball (24) to move.

7. The lumbar vertebral body slip reduction device according to claim 5, characterized in that: The adjusting mechanism comprises a fixed plate (31) fixed on the second connecting rod (122), a screw rod (32) threadedly connected to the fixed plate (31), a rotating block (34) fixed on the side of the screw rod (32) away from the second abutment plate (22), and a connecting plate (33) rotatably connected to the other side of the screw rod (32), a traction rope (35) is arranged between the connecting plate (33) and the movable plate (36), and a moving groove (2203) for the traction rope (35) to move is opened on the second abutment plate (22).

8. The lumbar vertebral body slip reduction device according to claim 2, characterized in that: The second abutment plate (22) is provided with an empty groove (2201) for the rolling ball (24) to rotate.

9. The lumbar vertebral body slip reduction device according to claim 2, characterized in that: A first elastic member (13) is provided between the first handle (11) and the second handle (12).

10. The lumbar vertebral body slip reduction device according to claim 2, characterized in that: Anti-skid particles (25) are provided on a side of the first abutment plate (21) away from the second abutment plate (22).

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