Spondylolisthesis reduction device

Abstract

The application relates to the field of medical equipment and discloses a lumbar spondylolisthesis restorer, which comprises a handle and further comprises a support plate arranged at one end of the handle and used for supporting the end plate of a vertebral body; the support plate comprises a first abutting plate arranged on the handle and a second abutting plate arranged on the handle and identical in shape with the first abutting plate; a ball is arranged on the side of the second abutting plate away from the first abutting plate; and an adjusting device is arranged on the side of the second abutting plate away from the first abutting plate and used for adjusting the distance that the ball extends out of the second abutting plate. Then, the displaced vertebral body is lifted by a lifting rod to be reset, the ball rolls in contact during the movement of the spondylolisthesis vertebral body, the resistance of spondylolisthesis reset can be reduced, the shearing force of the vertebral body caused by the lifting pedicle screw can be reduced, and the loosening of the pedicle screw can be prevented to avoid the failure of the vertebral body reset operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to a lumbar vertebral body spondylolisthesis reducer. BACKGROUND

[0002] In the spine surgery, intervertebral spondylolisthesis is a common spinal disease, which usually needs to be reset and fixed by surgery. With the continuous progress of medical technology, various auxiliary surgical instruments have emerged to improve the accuracy and safety of surgery. The vertebral endplate is the hardest part of the vertebral body, and the intervertebral spondylolisthesis reducer is used to support the endplate and expand the intervertebral space, and then the instrument is used to pull and reset the spondylolisthesis.

[0003] The existing device has the following disadvantages: the traditional vertebral body reduction method depends on the experience and manual operation of the doctor, which not only requires high skills of the doctor, but also has high surgical risk and uncertain reduction effect. Spondylolisthesis reduction often needs to be reset by pulling through the pedicle screw after releasing the surrounding tissue and structure. Most elderly patients have osteoporosis, poor pedicle screw strength, and easy spondylolisthesis reduction failure and screw loosening.

[0004] Therefore, the lumbar vertebral body spondylolisthesis reducer is proposed to solve the above problems. SUMMARY

[0005] The present application aims to provide a lumbar vertebral body spondylolisthesis reducer to solve the problems of poor pedicle screw strength, easy spondylolisthesis reduction failure, and screw loosening.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a lumbar vertebral body spondylolisthesis reducer, comprising a clamp handle, further comprising:

[0007] a support plate arranged at one end of the clamp handle and used for supporting the endplate of the vertebral body;

[0008] the support plate comprises:

[0009] a first abutting plate arranged on the clamp handle;

[0010] a second abutting plate arranged on the clamp handle and having the same shape as the first abutting plate;

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

[0012] an adjusting device arranged on one side of the second abutting plate away from the first abutting plate and used for adjusting the distance of the ball extending out of the second abutting plate.

[0013] The second handle is provided with a rotating shaft at the middle part, and the first handle is sleeved on the rotating shaft.

[0014] The first handle is provided with a rack at one side away from the first connecting rod, and the second handle is fixed with a tooth at one side away from the second connecting rod.

[0015] The first abutting plate and the second abutting plate are both fixed with a strutting plate at one side away from the handle.

[0016] The adjusting device comprises a movable plate arranged on the second abutting plate, a second elastic member arranged between the second abutting plate and the movable plate, and an adjusting mechanism arranged on the second abutting plate and connected with the movable plate for adjusting the installation position of the movable plate.

[0017] The movable plate is provided with a through hole for the ball to move at the position corresponding to the ball.

[0018] The adjusting mechanism comprises a fixed plate fixed on the second connecting rod, a screw rod screw-connected on the fixed plate, a rotating block fixed on one side of the screw rod away from the second abutting plate, and a connecting plate rotationally connected on the other side of the screw rod.

[0019] The second abutting plate is provided with a hollow groove for the ball to rotate.

[0020] The first handle and the second handle are provided with a first elastic member.

[0021] The first abutting plate is provided with anti-skid particles at one side away from the second abutting plate.

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

[0023] The application inserts the support plate of the lumbar spondylolisthesis reducer into the intervertebral space of the lumbar spondylolisthesis segment, and the second abutting plate is connected with the spondylolytic vertebral body, then the clamp handle is pressed to make the first abutting plate and the second abutting plate open, the distance between the first abutting plate and the second abutting plate is adjusted, the distance between the first abutting plate and the second abutting plate reaches the width required by the intervertebral space distraction surgery, the vertebral body is distracted, at this time the angle of the clamp handle is fixed, the distance between the distraction heads is also fixed, the adjusting device is rotated, the ball is extended from the inside of the second abutting plate and contacts the vertebral endplate of the spondylolytic vertebral body, then the displaced vertebral body is lifted and reset through the lifting rod, in the process of moving the spondylolytic vertebral body, the ball rolls in contact, which can reduce the resistance of spondylolisthesis reduction, reduce the shear force of the pedicle screw on the vertebral body, and prevent the loosening of the pedicle screw from causing the failure of the vertebral body reduction operation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a main structure schematic diagram of an embodiment of the application;

[0025] Figure 2 It is a structure schematic diagram of an embodiment of the application in plan view;

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

[0027] Figure 4 It is a structure schematic diagram of an embodiment of the application in support plate cross-sectional view;

[0028] Figure 5 It is a structure schematic diagram of an embodiment of the application in explosion view;

[0029] Figure 6 It is a structure schematic diagram of an embodiment of the application in which the second abutting plate is connected with the adjusting device;

[0030] Figure 7 It is a structure schematic diagram of an embodiment of the application in which the ball is connected with the second abutting plate;

[0031] Figure 8 It is a structure schematic diagram of an embodiment of the application in which the second abutting plate is connected with the adjusting device;

[0032] In the figure: 1, the handle of the forceps; 11, the first handle; 111, the rack; 112, the first connecting rod; 12, the second handle; 121, the tooth; 122, the second connecting rod; 13, the first elastic member; 14, the rotating shaft; 15, the rotating rod; 2, the support plate; 21, the first abutting plate; 22, the second abutting plate; 2201, the empty slot; 2202, the mounting slot; 2203, the moving slot; 23, the opening plate; 231, the wear-resistant particle; 24, the ball; 25, the anti-skid particle; 3, the adjusting device; 31, the fixed plate; 32, the screw rod; 33, the connecting plate; 34, the rotating block; 35, the traction rope; 36, the moving plate; 3601, the through hole; 37, the second elastic member. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] Please refer to Figures 1-8 The present application provides a technical solution: a lumbar spondylolisthesis reducer, comprising a forceps handle 1, further comprising:

[0035] A support plate 2 is arranged at one end of the forceps handle 1, and is used for supporting the endplate of the vertebral body.

[0036] The support plate 2 comprises:

[0037] A first abutting plate 21 is arranged on the forceps handle 1.

[0038] A second abutting plate 22 is arranged on the forceps handle 1 and has the same shape as the first abutting plate 21.

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

[0040] An adjusting device 3 is arranged on the side of the second abutting plate 22 away from the first abutting plate 21, and is used for adjusting the distance of the ball 24 extending out of the second abutting plate 22.

[0041] It should be noted that during operation, the support plate 2 of the lumbar spondylolisthesis reduction device is inserted into the intervertebral space of the spondylolisthesis segment, and the second abutment plate 22 is connected to the spondylolisthesis body. Then, the clamp handle 1 is pressed to open the first abutment plate 21 and the second abutment plate 22. The distance between the first abutment plate 21 and the second abutment plate 22 is adjusted to achieve the width required for the intervertebral space opening surgery. The vertebral body is opened. At this time, the opening angle of the clamp handle 1 is fixed, and the distance between the opening heads is also fixed. The adjustment device 3 is rotated so that the ball bearing 24 extends out from the inside of the second abutment plate 22 and contacts the vertebral endplate of the spondylolisthesis body. Then, the displaced vertebral body is lifted and repositioned by the lifting rod. During the movement of the spondylolisthesis body, the rolling contact of the ball bearing 24 can reduce the resistance of the spondylolisthesis reduction, reduce the shear force of the pedicle screw on the vertebral body, and prevent the vertebral body reduction operation from failing due to the loosening of the pedicle screw.

[0042] In one embodiment, the clamp handle 1 includes a second handle 12, a rotating shaft 14 disposed 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 disposed on one side of the first handle 11, and a second connecting rod 122 is rotatably disposed 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. A first abutting plate 21 is fixedly connected to the first connecting rod 112, and a second abutting plate 22 is fixedly connected to the second connecting rod 122.

[0043] This design is for reference. Figures 1-5 The first handle 11 and the second handle 12 are respectively rotatably mounted on the rotating shaft 14. Pressing the first handle 11 and the second handle 12 causes them to rotate along the rotating shaft 14. Then, the first connecting rod 112 and the second connecting rod 122 are connected by the scissor-mounted rotating rod 15. Thus, under the action of the first handle 11 and the second handle 12, the first abutment plate 21 and the second abutment plate 22 are opened, thereby spreading the adjacent vertebral bodies apart. 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. This design ensures the stability of the support plate 2 during the operation.

[0044] In one embodiment, a rack 111 is rotatably provided 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, with the tooth 121 engaging and fixed in the tooth groove of the rack 111.

[0045] This design is for reference. Figures 1-2 ,as well as Figure 5The connection between the first handle 11 and the second handle 12 is more stable through the snap-fit ​​fixing of the rack 111 and the tooth 121. This mechanical fixing method can effectively prevent the handle from sliding or rotating under the action of external force, thereby improving the stability and reliability of the entire structure. Since the rack 111 can rotate while the tooth 121 is fixed, the position between adjacent cones can be adjusted by rotating the first handle 11 and the second handle 12. After the distance between the first abutment plate 21 and the second abutment plate 22 is adjusted, the rack 111 is snap-fitted and fixed on the tooth 121, making the adjustment and locking process of the first handle 11 and the second handle 12 simple and quick, and improving the convenience of use.

[0046] In one embodiment, a support plate 23 is fixedly provided on the side of the first abutting plate 21 and the second abutting plate 22 away from the clamp handle 1, and wear-resistant particles 231 are fixed on the outer side of the support plate 23.

[0047] This design is for reference. Figure 8 The wear-resistant particles 231 on the expansion plate 23 can increase the friction between the expansion plate 23 and the endplate, preventing the endplate from sliding or falling off when the vertebra is supported, thus improving the success rate of vertebral repositioning.

[0048] In one embodiment, the adjusting device 3 includes a movable plate 36 adjustablely disposed on the second abutment plate 22, a second elastic member 37 disposed between the second abutment plate 22 and the movable plate 36, and an adjusting mechanism disposed on the second abutment plate 22 and connected to the movable plate 36 for adjusting the installation position of the movable plate 36. The second abutment plate 22 is provided with an installation groove 2202 for the movable plate 36 to move, and the second elastic member 37 is made of a damped spring or an elastic pad.

[0049] This design is for reference. Figures 6-8 Rotate the adjustment mechanism to adjust the installation position of the moving plate 36, and then move the moving plate 36 into the installation groove 2202. Then, the second elastic member 37 is squeezed, and then the ball 24 extends out from the inside of the moving plate 36 and contacts the cone, so that the cone and the ball 24 are slidably connected, reducing the resistance when the detachable cone moves.

[0050] In one embodiment, the movable plate 36 has a through hole 3601 at the position of the corresponding ball 24 for the ball 24 to move.

[0051] This design is for reference. Figures 6-8 The ball 24 moves on the moving plate 36 through the perforation 3601. Due to the rolling characteristics of the ball 24, the resistance of rolling friction is smaller than that of sliding friction, which helps to reduce energy loss and improve the motion efficiency of the system.

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

[0053] This design is for reference. Figures 1-8 By rotating the rotating block 34, the screw 32 can be driven to move in the thread on the fixed plate 31, thereby achieving precise adjustment. The connecting plate 33 and the moving plate 36 are connected by a traction rope 35. The connecting plate 33 drives the moving plate 36 to move inside the mounting groove 2202 through the traction rope 35. The moving groove 2203 opened on the second abutment plate 22 provides the necessary channel for the traction rope 35 to move smoothly in complex environments, thereby ensuring the normal operation of the adjustment mechanism.

[0054] In one embodiment, the second abutment plate 22 has a groove 2201 for the ball bearing 24 to rotate.

[0055] This design is for reference. 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, so it can significantly reduce frictional resistance, reduce wear, and thus extend the service life of the second abutment plate 22 and the ball 24.

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

[0057] This design is for reference. Figures 1-2 ,as well as Figure 5 The first elastic element 13 can provide a cushioning effect between the two handles, absorbing and dispersing the impact force, thereby reducing vibration and impact during use and improving the stability and durability of the equipment.

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

[0059] This design is for reference. Figure 4 The anti-slip particles 25 can increase the coefficient of friction between the first contact plate 21 and the contact surface of the cone, thereby effectively preventing slippage or displacement. The enhanced friction makes the equipment or tool more stable and reliable during use, reducing the risk of operational errors or accidents caused by slippage or displacement.

[0060] In addition, if the description in the embodiments involves "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features.

Claims

1. A spondylolisthesis reduction device comprising a handle (1), characterized in that, Also include: Support plate (2) is arranged at one end of the handle (1), used for supporting the end plate of the vertebral body; The support plate (2) comprises: First abutment plate (21) is arranged on the handle (1); Second abutment plate (22) is arranged on the handle (1) and has the same shape as the first abutment plate (21); Ball (24) is arranged on the side of the second abutment plate (22) away from the first abutment plate (21); Adjusting device (3) is arranged on the side of the second abutment plate (22) away from the first abutment plate (21), used for adjusting the distance of the ball (24) extending out of the second abutment plate (22).

2. The spondylolisthesis reducer of claim 1, wherein: The 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), one side of the first handle (11) is rotatably provided with a first connecting rod (112), one side of the second handle (12) is rotatably provided with a second connecting rod (122), the first connecting rod (112) and the second connecting rod (122) are connected by a rotating rod (15), the first abutment plate (21) is fixedly connected with the first connecting rod (112), and the second abutment plate (22) is fixedly connected with the second connecting rod (122).

3. The lumbar spondylolisthesis reducer of claim 2, wherein: The first handle (11) is rotatably provided with a rack (111) on the side away from the first connecting rod (112), the second handle (12) is fixedly provided with a tooth (121) on the side away from the second connecting rod (122), and the tooth (121) is clamped and fixed in the tooth groove of the rack (111).

4. The lumbar spondylolisthesis reducer of claim 2, wherein: The first abutment plate (21) and the second abutment plate (22) are fixedly provided with a distraction plate (23) on the side away from the handle (1), and the outer side of the distraction plate (23) is fixedly provided with wear-resistant particles (231).

5. The lumbar spondylolisthesis reducer of claim 2, wherein: The adjusting device (3) comprises a movable plate (36) adjustably arranged on the second abutment plate (22), a second elastic member (37) arranged between the second abutment plate (22) and the movable plate (36), and an adjusting mechanism arranged on the second abutment plate (22) and connected with the movable plate (36) and used for adjusting the mounting position of the movable plate (36), and the second abutment plate (22) is provided with a mounting groove (2202) for the movement of the movable plate (36).

6. The lumbar spondylolisthesis reducer of claim 5, wherein: The movable plate (36) is provided with a perforation (3601) for the movement of the ball (24) at the position corresponding to the ball (24).

7. The lumbar spondylolisthesis reducer of claim 5, wherein: The adjusting mechanism comprises a fixing plate (31) fixed on the second connecting rod (122), a screw rod (32) threadedly connected on 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 on the other side of the screw rod (32), and a traction rope (35) is arranged between the connecting plate (33) and the moving plate (36), and the second abutting plate (22) is provided with a moving groove (2203) for the movement of the traction rope (35).

8. The lumbar spondylolisthesis reducer of claim 2, wherein: The second abutting plate (22) is provided with a hollow groove (2201) for the rotation of the ball (24).

9. The lumbar spondylolisthesis reducer of claim 2, wherein: A first elastic member (13) is arranged between the first handle (11) and the second handle (12).

10. The lumbar spondylolisthesis reducer of claim 2, wherein: The first abutting plate (21) is provided with anti-skid particles (25) on the side away from the second abutting plate (22).

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