Auxiliary lumbar spondylolisthesis pulling reduction instrument

Abstract

The utility model relates to the technical field of spinal surgery auxiliary tool, concretely is a kind of auxiliary lumbar spondylolisthesis pull reset instrument, including fixed frame, two rotating arms are symmetrically installed on fixed frame, the lower end of rotating arm is installed with end screw, the upper end of rotating arm is rotatably connected with fixed frame, rotating arm is connected fixed between the middle part of rotating arm by adjusting component, the upper end of rotating arm is installed with fastening lock cap. In the auxiliary lumbar spondylolisthesis pull reset instrument, in the existing lumbar surgery, for the indirect reset method of commonly used nail rod system of 2 degrees or more lumbar spondylolisthesis patient, when facing the patient with combined osteoporosis, it is easy to lead to reset failure due to the decrease of fixed strength, causes postoperative lumbago, lower extremity neurological symptoms and other problems. The instrument adopts the mode of directly anchoring bilateral pedicle screws, first pull reset and then rod locking, compared with traditional indirect reset, effectively avoid the drawbacks of mechanical transmission loss and unstable fixation, can realize more accurate and stable reset.

Description

Technical Field

[0001] This utility model relates to the field of spinal surgery auxiliary tools, specifically to an auxiliary device for lifting and repositioning lumbar spondylolisthesis. Background Technology

[0002] In the field of spinal surgery, lumbar spondylolisthesis is a common spinal disease that seriously affects patients' quality of life, and its surgical treatment has always been a focus of clinical research. Currently, in lumbar spondylolisthesis surgery, the rod-and-pin system is a commonly used reduction tool, mainly achieving indirect reduction of the vertebral body through the mechanical action of the connecting rod. However, this indirect reduction method has many drawbacks in practical application, and the postoperative vertebral body reduction effect is often difficult to achieve the ideal result, greatly affecting the surgical treatment outcome and the patient's postoperative recovery.

[0003] The limitations of indirect reduction methods are particularly pronounced for patients with grade 2 or higher lumbar spondylolisthesis. Furthermore, the problem is exacerbated when the patient also has osteoporosis. Osteoporosis significantly reduces the fixation strength of the rod-and-pin system, greatly increasing the risk of indirect reduction failure. This can lead to a series of complications, including postoperative low back pain and lower extremity neurological symptoms, seriously threatening the patient's health and postoperative quality of life.

[0004] Existing technologies, such as the pedicle screw traction and reduction device (application number CN201621383434.5) and the vertebral body reduction device (application number CN201820655855.1), while exploring vertebral body reduction techniques to some extent, have not effectively solved the aforementioned problems. Therefore, there is an urgent need to develop an auxiliary device capable of directly and accurately reducing slipped vertebrae and flexibly adapting to individual patient differences, in order to improve the treatment efficacy and safety of lumbar spondylolisthesis surgery. Utility Model Content

[0005] The purpose of this invention is to provide an auxiliary device for lifting and reducing lumbar spondylolisthesis, in order to solve the problems of the indirect reduction method proposed in the background art, which has many drawbacks in practical applications. The postoperative vertebral reduction effect is often difficult to achieve the ideal state, which greatly affects the surgical treatment effect and the patient's postoperative recovery.

[0006] To achieve the above objectives, this utility model provides an auxiliary device for lifting and reducing lumbar spondylolisthesis, including a fixed frame. Two rotating arms are symmetrically mounted on the fixed frame. The lower end of each rotating arm is fitted with an end screw. The upper end of each rotating arm is rotatably connected to the fixed frame. The middle parts of the rotating arms are connected and fixed together by an adjusting component. A fastening cap is installed at the upper end of each rotating arm. The upper end of each end screw is connected to the fastening cap via a central screw shaft.

[0007] This device uses a fixation frame as its basic support structure, with two symmetrically mounted rotating arms that can rotate around their upper connection points with the fixation frame. The end screws at the lower ends of the rotating arms are used for pedicle screw implantation, establishing a connection with the patient's vertebral body. The middle sections of the rotating arms are connected via adjustment components, allowing for adjustment of the distance and angle between the two arms. The locking caps at the upper ends of the rotating arms are connected to the end screws via a central screw shaft; rotating the locking caps drives the central screw shaft, thus enabling the manipulation of the end screws.

[0008] Preferably, a gun-shaped grip is mounted on the top of the mounting bracket.

[0009] This feature includes a gun-shaped grip mounted on top of the fixation frame. Its ergonomic shape makes it easy for doctors to hold. When operating instruments to lift and reposition the vertebrae, doctors can apply external force by gripping the gun-shaped grip.

[0010] Preferably, an upper adjusting member is installed on the upper side of the rotating arm. The upper adjusting member is rotatably connected to the fixing frame through a first locking pin and is locked in place by a nut.

[0011] In this configuration, the upper adjustment component on one side of the upper part of the rotating arm is rotatably connected to the fixed frame via the first locking pin. When it is necessary to adjust the angle of the rotating arm, the nut is loosened, and the rotating arm can rotate around the first locking pin. After adjusting to the appropriate angle, the nut is tightened to lock and fix it.

[0012] Preferably, the adjusting component includes an adjusting threaded sleeve, the inner side of which is symmetrically provided with bidirectional threaded grooves, a threaded rod is threadedly connected to the bidirectional threaded grooves, a telescopic adjusting head is installed at the end of the threaded rod, and an anti-slip rubber sleeve is fitted on the outer side of the adjusting threaded sleeve.

[0013] The adjusting threaded sleeve in this setting adjustment component has a bidirectional threaded groove on its inner side. The threaded rod is threadedly connected to the bidirectional threaded groove. When the adjusting threaded sleeve is rotated, due to the thread transmission principle, the two threaded rods will move inward or outward at the same time, driving the telescopic adjustment head at the end to move, thereby adjusting the distance between the two rotating arms. The anti-slip rubber sleeve on the outer side increases the friction during adjustment, making it easier for doctors to operate.

[0014] Preferably, a central adjusting component is installed on the rotating arm near the telescopic adjusting head. The central adjusting component is rotatably connected to the telescopic adjusting head via a second locking pin and is locked in place by a nut.

[0015] In this configuration, the central adjusting component of the rotating arm near the telescopic adjusting head is rotatably connected to the telescopic adjusting head via a second locking pin. When adjusting the angle of the rotating arm or performing other operations, the nut can be loosened to allow the central adjusting component to rotate relative to the telescopic adjusting head. After adjustment, the nut can be tightened to secure it.

[0016] Preferably, the interior of the rotating arm is hollow, the central screw shaft is located inside the rotating arm, the upper end of the central screw shaft is fixedly connected to the fastening cap, and the lower end of the central screw shaft is fixedly connected to the end screw.

[0017] This design features a hollow internal structure for the rotating arm, providing installation space for the center screw shaft and allowing it to be located inside the rotating arm. The upper end of the center screw shaft is fixedly connected to the fastening cap, and the lower end is fixedly connected to the end screw, forming a force transmission channel. When the fastening cap is rotated, the force is transmitted to the end screw through the center screw shaft.

[0018] Preferably, a screw head is installed at the lower end of the central screw shaft, and a screw cap is installed at the upper end of the end screw, with the screw head and screw cap engaging in a sleeve-fitting manner.

[0019] In this design, the screw head at the lower end of the center screw shaft and the screw cap at the upper end of the end screw are fitted together by a sleeve. The two are connected by a shape fit, which facilitates installation and disassembly.

[0020] Preferably, both the screw head and the screw cap are provided with a pin hole in the transverse direction, and the screw head and the screw cap are connected and fixed by a locking pin through the pin hole.

[0021] This feature involves horizontally opening pin holes on the screw head and screw cap. By inserting a locking pin through the pin hole, the screw head and screw cap are fixed together, preventing relative rotation or separation during surgical procedures.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] This assistive device for lumbar spondylolisthesis reduction addresses the shortcomings of traditional indirect reduction methods. In lumbar surgery, the commonly used indirect reduction method with a screw-rod system for grade 2 or higher lumbar spondylolisthesis often fails to achieve the same results in patients with osteoporosis due to reduced fixation strength, leading to postoperative lower back pain and lower extremity neurological symptoms. This device directly anchors bilateral pedicle screws, first reducing the spondylolisthesis and then locking it with the rod. Compared to traditional indirect reduction, this method effectively avoids the drawbacks of mechanical transmission loss and unstable fixation, achieving more precise and stable reduction. It provides a reliable surgical option, especially for patients with osteoporosis, significantly improving surgical outcomes and reducing the risk of postoperative complications.

[0024] After the end screw is implanted into the pedicle, the middle adjustment component and the second locking pin work together to flexibly and precisely adjust the angle of the pedicle screw according to the actual anatomical shape of the patient's vertebral body, and reliably lock it, avoiding the reduction effect or tissue damage caused by angle deviation. At the same time, the linkage design of the telescopic adjustment head and the bidirectional threaded groove and threaded rod in the adjusting threaded sleeve can quickly and accurately adjust the distance between the two rotating arms according to the vertebral body width of different patients, ensuring that the instrument is highly adapted to the individual characteristics of the patient, and providing strong support for the precise operation of the surgery.

[0025] The gun-shaped handle at the top of the fixation frame is ergonomically designed to fit the doctor's grip habits. After the pedicle screw is implanted, the doctor only needs to hold the handle and pull upwards to directly complete the vertebral repositioning through the mechanical transmission of the instrument. This greatly simplifies the surgical procedure, significantly shortens the operation time compared to traditional repositioning methods, reduces the doctor's fatigue, and effectively improves the success rate and stability of repositioning, thus optimizing the overall efficiency and quality of the surgery. Attached Figure Description

[0026] Figure 1 This is one of the overall structural schematic diagrams of this utility model;

[0027] Figure 2 This is one of the overall structural schematic diagrams of this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the adjusting component in this utility model;

[0029] Figure 4 This is a schematic diagram of the rotating arm in this utility model;

[0030] The meanings of the labels in the diagram are as follows:

[0031] 1. Fixing bracket; 2. Gun grip; 3. Rotating arm; 4. Fastening cap; 5. End screw; 6. Upper adjusting component; 7. First locking pin; 8. Telescopic adjusting head; 9. Adjusting threaded sleeve; 10. Anti-slip rubber sleeve; 11. Middle adjusting component; 12. Second locking pin; 13. Two-way threaded groove; 14. Threaded rod; 15. Center screw shaft; 16. Screw head; 17. Screw cap; 18. Locking pin. Detailed Implementation

[0032] 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.

[0033] This utility model provides an auxiliary device for lifting and repositioning lumbar spondylolisthesis, such as... Figure 1 , Figure 2 As shown, it includes a fixed frame 1, on which two rotating arms 3 are symmetrically mounted. The lower end of the rotating arm 3 is equipped with an end screw 5, and the upper end of the rotating arm 3 is rotatably connected to the fixed frame 1. The middle parts of the rotating arms 3 are connected and fixed by an adjusting component. The upper end of the rotating arm 3 is equipped with a fastening cap 4, and the upper end of the end screw 5 is connected to the fastening cap 4 through a central screw shaft 15.

[0034] The fixation frame 1 serves as the basic support structure of the entire device. Two symmetrically mounted rotating arms 3 can rotate around the connection point between the upper end of the rotating arms 3 and the fixation frame 1. The end screws 5 installed at the lower end of the rotating arms 3 are used for implanting the pedicle screws, achieving connection with the patient's vertebral body. The middle of the rotating arms 3 is fixed via an adjusting component, which can be adjusted to change the distance and angle between the two rotating arms 3. The locking cap 4 at the upper end of the rotating arms 3 is connected to the end screws 5 via a central screw shaft 15. Rotating the locking cap 4 rotates the central screw shaft 15, thus enabling the manipulation of the end screws 5. This structural design allows the device to adapt to different vertebral body shapes in patients. Flexible adjustment of the rotating arms 3 via the adjusting component ensures precise implantation of the end screws 5 into the pedicle screws. The connection between the locking cap 4 and the central screw shaft 15 facilitates precise manipulation of the end screws 5, providing a stable and reliable foundation for subsequent vertebral body traction and repositioning.

[0035] In this embodiment, as Figure 1 As shown, a gun-shaped grip 2 is mounted on the top of the mounting bracket 1.

[0036] A gun-shaped grip 2 is installed on the top of the fixation frame 1. Its ergonomic shape makes it easy for doctors to hold. When using the instrument to perform vertebral body lifting and repositioning, the doctor applies external force by gripping the gun-shaped grip 2 to control the movement of the instrument.

[0037] The gun-shaped grip 2 significantly improves the convenience and comfort of instrument operation, allowing doctors to operate instruments more easily and stably during surgery, effectively reducing operational fatigue, and thus improving the accuracy and efficiency of surgical operations.

[0038] Specifically, such as Figure 1 , Figure 2 As shown, an upper adjusting member 6 is installed on one side of the upper part of the rotating arm 3. The upper adjusting member 6 is rotatably connected to the fixed frame 1 through the first locking pin 7 and is locked and fixed by a nut.

[0039] The upper adjustment component 6 on one side of the upper part of the rotating arm 3 is rotatably connected to the fixing frame 1 via the first locking pin 7. When it is necessary to adjust the angle of the rotating arm 3, the nut is loosened, and the rotating arm 3 can rotate around the first locking pin 7. After adjusting to the appropriate angle, the nut is tightened to lock it in place. This structure allows doctors to flexibly adjust the angle of the rotating arm 3 according to the patient's actual situation, ensuring that the end screw 5 is implanted into the pedicle at the optimal angle, improving the accuracy of screw implantation, enhancing the adaptability of the instrument to different patients, and optimizing surgical outcomes.

[0040] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the adjusting component includes an adjusting threaded sleeve 9, with bidirectional threaded grooves 13 symmetrically arranged on the inner side of the adjusting threaded sleeve 9. A threaded rod 14 is threadedly connected to the inner side of the bidirectional threaded groove 13, and a telescopic adjusting head 8 is installed at the end of the threaded rod 14. An anti-slip rubber sleeve 10 is fitted on the outer side of the adjusting threaded sleeve 9.

[0041] The adjusting threaded sleeve 9 in the adjusting component has symmetrical bidirectional threaded grooves 13 on its inner side, and the threaded rods 14 are threadedly connected to the bidirectional threaded grooves 13. When the adjusting threaded sleeve 9 is rotated, based on the principle of thread transmission, the two threaded rods 14 will move inward or outward simultaneously, driving the telescopic adjusting head 8 at the end to move, thereby adjusting the distance between the two rotating arms 3. The anti-slip rubber sleeve 10 fitted on the outer side of the adjusting threaded sleeve 9 increases the friction during adjustment, making it easier for the doctor to apply force. Through the adjusting component, the distance between the two rotating arms 3 can be precisely adjusted according to the vertebral width of different patients, making the instrument better adaptable to individual patient differences. The design of the anti-slip rubber sleeve 10 ensures stable and convenient adjustment operation, allowing for quick and accurate adjustment during surgery, thus improving surgical efficiency.

[0042] Furthermore, such as Figure 1 , Figure 2 As shown, a central adjusting component 11 is installed on the rotating arm 3 near the telescopic adjusting head 8. The central adjusting component 11 is rotatably connected to the telescopic adjusting head 8 through the second locking pin 12 and is locked and fixed by a nut.

[0043] The central adjusting component 11, installed near the telescopic adjusting head 8 on the rotating arm 3, is rotatably connected to the telescopic adjusting head 8 via the second locking pin 12. When adjusting the angle of the rotating arm 3 or performing other operations, the nut is loosened, allowing the central adjusting component 11 and the telescopic adjusting head 8 to rotate relative to each other. After adjustment, the nut is tightened to secure it. The cooperation between the central adjusting component 11 and the second locking pin 12 further enhances the flexibility and stability of the rotating arm 3's angle adjustment. When fine-tuning the rotating arm 3 or coordinating with overall operations, its position and angle can be controlled more precisely, ensuring the accuracy and reliability of the implantation of the end screw 5 and the vertebral body lifting and repositioning.

[0044] Furthermore, such as Figure 4 As shown, the interior of the rotating arm 3 is hollow. The central screw shaft 15 is located inside the rotating arm 3. The upper end of the central screw shaft 15 is fixedly connected to the fastening cap 4, and the lower end of the central screw shaft 15 is fixedly connected to the end screw 5. The end screw 5 is a detachable screw, and its length is 5cm-6cm.

[0045] The rotating arm 3 has a hollow internal structure, providing installation space for the central screw shaft 15, which is located inside the rotating arm 3. The upper end of the central screw shaft 15 is fixedly connected to the fastening cap 4, and the lower end is fixedly connected to the end screw 5, forming a force transmission channel. When the fastening cap 4 is rotated, the force is transmitted to the end screw 5 through the central screw shaft 15. The hollow structure design reduces the weight of the instrument while ensuring the strength of the rotating arm 3, making it easier for the doctor to operate; the setting of the central screw shaft 15 achieves stable force transmission between the fastening cap 4 and the end screw 5, ensuring that the operation of the end screw 5 can be performed accurately and effectively, improving the reliability of the surgical operation.

[0046] Furthermore, such as Figure 4 As shown, a screw head 16 is installed at the lower end of the central screw shaft 15, and a screw cap 17 is installed at the upper end of the end screw 5. The screw head 16 and the screw cap 17 are fitted together.

[0047] The screw head 16 at the lower end of the central screw shaft 15 and the screw cap 17 at the upper end of the end screw 5 are connected by a sleeve engagement, achieving a connection through a shape fit. This design facilitates the installation and disassembly of both. The sleeve engagement of the screw head 16 and the screw cap 17 makes the connection between the central screw shaft 15 and the end screw 5 simpler and faster, allowing for rapid assembly and adjustment of instruments during surgery, thus improving surgical efficiency. At the same time, this connection method ensures the stability of force transmission, ensuring that the end screw 5 can accurately execute operational commands.

[0048] Furthermore, such as Figure 4 As shown, both the screw head 16 and the screw cap 17 have horizontally opened pin holes, and the screw head 16 and the screw cap 17 are connected and fixed by a locking pin 18 passing through the pin holes.

[0049] A pin hole is laterally made on the screw head 16 and screw cap 17. A locking pin 18 is inserted into the pin hole to fix the screw head 16 and screw cap 17 together, preventing relative rotation or separation during surgical operation. The locking pin 18 further enhances the firmness and stability of the connection between the screw head 16 and screw cap 17, ensuring reliable connection between the central screw shaft 15 and the end screw 5 during operation of the end screw 5 and vertebral body lifting and reduction, avoiding the impact of loose connection on surgical results, and ensuring the safety and effectiveness of the operation.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for lifting and reducing lumbar spondylolisthesis, comprising a fixation frame (1), characterized in that: Two rotating arms (3) are symmetrically installed on the fixed frame (1). The lower end of the rotating arm (3) is equipped with an end screw (5). The upper end of the rotating arm (3) is rotatably connected to the fixed frame (1). The middle parts of the rotating arms (3) are connected and fixed by an adjusting component. The upper end of the rotating arm (3) is equipped with a fastening cap (4). The upper end of the end screw (5) is connected to the fastening cap (4) through a central screw shaft (15).

2. The assisted lumbar spondylolisthesis lifting and reduction device according to claim 1, characterized in that: A gun-shaped grip (2) is mounted on the top of the mounting bracket (1).

3. The assisted lumbar spondylolisthesis lifting and reduction device according to claim 1, characterized in that: An upper adjusting member (6) is installed on one side of the upper part of the rotating arm (3). The upper adjusting member (6) is rotatably connected to the fixed frame (1) through the first locking pin (7) and is locked and fixed by a nut.

4. The assisted lumbar spondylolisthesis lifting and reduction device according to claim 1, characterized in that: The adjusting component includes an adjusting threaded sleeve (9), on the inner side of which a bidirectional threaded groove (13) is symmetrically provided, and a threaded rod (14) is threadedly connected to the bidirectional threaded groove (13). A telescopic adjusting head (8) is installed at the end of the threaded rod (14), and an anti-slip rubber sleeve (10) is fitted on the outer side of the adjusting threaded sleeve (9).

5. The assisted lumbar spondylolisthesis lifting and reduction device according to claim 4, characterized in that: The rotating arm (3) is equipped with a central adjusting component (11) near the telescopic adjusting head (8). The central adjusting component (11) is rotatably connected to the telescopic adjusting head (8) through a second locking pin (12) and is locked and fixed by a nut.

6. The assisted lumbar spondylolisthesis lifting and reduction device according to claim 1, characterized in that: The interior of the rotating arm (3) is hollow. The central screw shaft (15) is located inside the rotating arm (3). The upper end of the central screw shaft (15) is fixedly connected to the fastening cap (4), and the lower end of the central screw shaft (15) is fixedly connected to the end screw (5).

7. The assisted lumbar spondylolisthesis lifting and reduction device according to claim 6, characterized in that: The lower end of the central screw shaft (15) is fitted with a screw head (16), and the upper end of the end screw (5) is fitted with a screw cap (17). The screw head (16) and the screw cap (17) are engaged.

8. The assisted lumbar spondylolisthesis lifting and reduction device according to claim 7, characterized in that: Both the screw sleeve (16) and the screw cap (17) are provided with a pin hole in the horizontal direction. The pin hole is used to connect and fix the screw sleeve (16) and the screw cap (17) by passing a locking pin (18).

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