Expandable atlantoaxial lateral mass reduction fusion cage

Abstract

The invention belongs to the technical field of medical instruments, and discloses a distractable atlantoaxial lateral mass reduction fusion cage which is characterized in that an upper sliding groove is formed in the bottom of the right side of an upper cover, a lower sliding groove is formed in the top of the right side of a lower cover, one end of a rotating shaft supporting plate penetrates through the upper sliding groove and the lower sliding groove, and the left side of the rotating shaft supporting plate is connected with the right side of a distracting mechanism supporting block; the left side of the opening mechanism supporting block is in threaded connection with the right side of a supporting head stud, the left end of a supporting head stud tightening rod penetrates through the rotating shaft supporting plate and the opening mechanism supporting block to be connected with the right side of the supporting head stud, the left side of the supporting head stud is movably connected with an opening structure supporting head, and an upper cover opening push rod and a lower cover opening push rod are hinged to the opening structure supporting head. The upper cover opening push rod is connected with the upper cover, and the lower cover opening push rod is connected with the lower cover. The atlantoaxial lateral mass pushing device has the advantages that effective pushing and resetting of atlantoaxial lateral masses are achieved, nerves are accurately avoided in the operation process, and the treatment safety and the operation success rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an expandable atlantoaxial lateral mass reduction and fusion device. Background Art

[0002] With the accelerating pace of life and the increasing aging of the population, the incidence of spinal diseases is increasing year by year, especially in the upper cervical spine, where lesions are becoming more complex. Due to the unique anatomical structure of the atlantoaxial spine, dislocation or instability can easily lead to spinal canal stenosis, which in turn can compress the spinal cord or nerves, severely impacting the patient's neurological function and quality of life. In this context, there is an urgent clinical need for an atlantoaxial lateral mass reduction and fusion device that can achieve stable reduction, precise fusion, and a push-out function.

[0003] The atlantoaxial lateral mass reduction and fusion devices currently available on the market have a relatively simple structure, and most of them are integrated fusion devices. This type of device usually integrates the reduction and fusion functions into a fixed structure, lacks flexible adjustment capabilities, and is difficult to adapt to the pathological characteristics of different patients. In particular, it is impossible to effectively push apart and dynamically adjust the distance between the vertebrae during surgery, resulting in the risk of the axis protrusion pressing against the nerve during the reduction process. In addition, while this type of device achieves reduction and fusion, it often lacks further structural design for nerve protection, posing certain intraoperative safety risks.

[0004] Therefore, it is necessary to provide an expandable atlantoaxial lateral mass reduction and fusion device that can not only effectively push and reduce the atlantoaxial lateral mass, but also accurately avoid nerves during surgery, thereby improving the safety of treatment and the success rate of surgery. Summary of the Invention

[0005] The present invention discloses an expandable atlantoaxial lateral mass reduction and fusion device, which is a pushable device suitable for effectively reducing and fusing the atlantoaxial lateral masses and preventing the axis vertebrae from compressing nerves. It belongs to the technical field of spinal surgical medical devices and can effectively solve the technical problems involved in the background technology.

[0006] To achieve the above object, the technical solution of the present invention is: A expandable atlantoaxial lateral mass reduction and fusion device, comprising an upper cover, a lower cover, a rotary shaft support plate and a support head stud tightening rod, wherein the bottom of the right side of the upper cover is provided with an upper slide groove, the top of the right side of the lower cover is provided with a lower slide groove, one end of the rotary shaft support plate passes through the upper slide groove and the lower slide groove, the left side of the rotary shaft support plate is connected to the right side of the expansion mechanism support block, the left side of the expansion mechanism support block is screwed to the right side of the support head stud, and the left end of the support head stud tightening rod passes through the rotary shaft support The plate and the support block of the support mechanism are connected to the right side of the support head stud, and the left side of the support head stud is movably connected to the support structure support head. The support structure support head is hinged with an upper cover support push rod and a lower cover support push rod. The upper cover support push rod is connected to the upper cover, and the lower cover support push rod is connected to the lower cover. When in use, the support head stud tightening rod is rotated to drive the support head stud to rotate and move, so that the support structure support head moves, thereby forming the opening and closing of the upper cover and the lower cover.

[0007] The one-piece fusion device currently used in clinical practice has a relatively simple structure and insufficient pushing function, which cannot achieve fine-tuning of the pushing angle and pushing distance during surgery, and can easily cause insufficient or excessive pushing, thereby affecting the reduction effect and even aggravating nerve compression. This device, however, integrates pushing, positioning, limiting and resetting functions through modular design, and can achieve dynamic adjustment during surgery to meet the personalized needs of different patients with different cervical spine structures and lesion conditions. A pushable atlantoaxial lateral mass reduction and fusion device is provided, which belongs to the field of spinal surgical medical devices and is particularly suitable for treating nerve compression problems caused by dislocation or instability of the atlantoaxial lateral mass. The device realizes controllable pushing and resetting operations of the atlantoaxial lateral mass through a mechanical structure, avoiding the risk of nerve compression by the axial protrusion due to improper reduction, and improving intraoperative safety and fusion effect.

[0008] As a preferred improvement of the present invention: upper slide grooves are provided at the bottom of the front and rear sides of the right side of the upper cover, lower slide grooves are provided at the top of the front and rear sides of the right side of the lower cover, and cylindrical protrusions are provided on the front and rear sides of the rotating shaft support plate. The cylindrical protrusions pass through the upper slide grooves and the lower slide grooves, so that the upper cover and the lower cover can rotate relative to each other.

[0009] As a preferred improvement of the present invention: the upper cover includes a top plate, and lower side plates are provided on the front and rear sides of the bottom of the top plate, and the upper slide groove is provided on the lower side plate; the lower cover includes a bottom plate, and upper side plates are provided on the front and rear sides of the top of the bottom plate, and the lower slide groove is provided on the upper side plate; the spacing between the two lower side plates is greater than the spacing between the two upper side plates, and the front and rear sides of the rotating shaft support plate abut against the upper side plates.

[0010] As a preferred improvement of the present invention: the rotary shaft support plate and the spreading mechanism support block are connected by rotary shaft support plate fixing bolts.

[0011] As a preferred improvement of the present invention: the reduction fusion device is provided with a positioning device for limiting the position of the rotary shaft support plate.

[0012] As a preferred improvement of the present invention: the locking device includes a rotating shaft limiting plate, the rotating shaft support plate is provided with a cylindrical protrusion, the cylindrical protrusion passes through the upper slide groove and the lower slide groove, and the rotating shaft limiting plate is provided with a locking hole matching the cylindrical protrusion.

[0013] As a preferred improvement of the present invention: the number of the card holes is 3, and the card holes are interconnected, the reduction fusion device also includes a rotating shaft limit plate fixing bolt, the rotating shaft limit plate fixing bolt is screwed to the rotating shaft support plate, and the rotating shaft limit plate is pressed against the upper cover or the lower cover.

[0014] As a preferred improvement of the present invention: the support head stud includes a first diameter portion, a second diameter portion and a third diameter portion from left to right, the diameter of the second diameter portion is smaller than the first diameter portion and the third diameter portion, the right side portion of the support structure support head is recessed to the left to form a first rotation groove, the first rotation groove corresponds to the first diameter portion, and a support head stud limiting block is connected to the right side of the support structure support head, the support head stud limiting block is penetrated by a support head stud through hole in the left and right directions, the position of the support head stud through hole corresponds to the first rotation groove, and the diameter of the support head stud through hole is smaller than the diameter of the first diameter portion and larger than the diameter of the second diameter portion.

[0015] As a preferred improvement of the present invention: the support head of the support structure and the support head stud limit block are fixedly installed by the support head stud limit block fixing bolts, and the support head stud limit block is composed of an upper limit plate and a lower limit plate, an upper limit hole is provided at the bottom of the upper limit plate, and a lower limit hole is correspondingly provided at the top of the lower limit plate, and the upper limit hole and the lower limit hole are combined to constitute the support head stud through hole.

[0016] As a preferred improvement of the present invention: the first diameter portion and the second diameter portion are screwed, or the first diameter portion is made of elastic material, so that the support head stud limit block is stuck at the second diameter portion.

[0017] The beneficial effects of the present invention are as follows: 1. The pushable atlantoaxial lateral mass reduction and fusion device provided by the company addresses the problems of existing integrated fusion devices, such as single structure, non-adjustable opening, poor reduction accuracy, and poor fusion effect. Through a series of innovative structural designs, it achieves a safer, more precise, and stable reduction and fusion of the atlantoaxial structure. 2. It supports intraoperative fine-tuning of the pushing path. By adjusting the position of the rotary axis support plate and the advancement amount of the support head stud, the opening angle and distance can be flexibly set to adapt to different lesion locations and anatomical structures. The overall structure is compact, which is convenient for doctors to operate during surgery, reduces surgical risks, and improves operational safety. It is suitable for reduction and fusion surgery under pathological conditions such as atlantoaxial dislocation, instability, and subluxation. It is particularly suitable for treating symptoms caused by the axis protrusion pressing on the nerves, and has broad clinical application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which: Figure 1 This is a schematic diagram of an expandable atlantoaxial lateral mass reduction and fusion device according to the present invention; Figure 2 This is a schematic diagram of the present invention in an expanded state; Figure 3 Schematic diagram of the internal structure of the present invention Figure 1 ; Figure 4 Schematic diagram of the internal structure of the present invention Figure 2 ; Figure 5 It is a schematic diagram of the decomposition of the present invention.

[0019] In the figure: 1-upper cover, 101-upper slide, 2-lower cover, 201-lower slide, 3-rotating shaft limit plate, 4-upper cover support push rod, 5-lower cover support push rod, 6-support head of support structure, 7-support head stud limit block, 8-support head stud, 9-support mechanism support block, 10-rotating shaft support plate, 11-support head stud tightening rod, 12-rotating shaft support plate fixing bolt, 13-rotating shaft limit plate fixing bolt, 14-support head stud limit block fixing bolt. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0023] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] See also Figure 1-Figure 5As shown, the present invention provides a expandable atlantoaxial lateral mass reduction and fusion device, comprising an upper cover 1, a lower cover 2, a rotary shaft support plate 10 and a support head stud tightening rod 11, the bottom of the right side of the upper cover 1 is provided with an upper slide groove 101, the top of the right side of the lower cover 2 is provided with a lower slide groove 201, one end of the rotary shaft support plate 10 passes through the upper slide groove 101 and the lower slide groove 201, so that the upper cover 1 and the lower cover 2 can rotate relative to each other and provide a force point for the rotary shaft support plate 10, the left side of the rotary shaft support plate 10 is connected to the right side of the expansion mechanism support block 9, and the left side of the expansion mechanism support block 9 is screwed to the right side of the support head stud 8 The left end of the support head stud tightening rod 11 passes through the rotary shaft support plate 10 and the support mechanism support block 9 to connect to the right side of the support head stud 8. The left side of the support head stud 8 is movably connected to the support structure support head 6. The support structure support head 6 is hinged with an upper cover support push rod 4 and a lower cover support push rod 5. The upper cover support push rod 4 is connected to the upper cover 1, and the lower cover support push rod 5 is connected to the lower cover 2. When in use, rotating the support head stud tightening rod 11 drives the support head stud 8 to rotate and move, so that the support structure support head 6 moves, thereby forming the opening and closing of the upper cover 1 and the lower cover 2. A shift fixing structure can be set at the right end of the upper cover 1. After moving the support structure support head 6, the support head stud tightening rod 11 is fixed to maintain the open state. A simple structure such as a snap can be used.

[0026] As an embodiment, the bottom of the front and rear sides of the right side of the upper cover 1 are provided with an upper slide groove 101, the top of the front and rear sides of the right side of the lower cover 2 are provided with a lower slide groove 201, and the front and rear sides of the rotating shaft support plate 10 are provided with a cylindrical protrusion, which passes through the upper slide groove 101 and the lower slide groove 201. The upper cover 1 includes a top plate, and the front and rear sides of the bottom of the top plate are provided with a lower side plate, and the lower side plate is provided with the upper slide groove 101. The lower cover 2 includes a bottom plate, and the front and rear sides of the top of the bottom plate are provided with an upper side plate, and the upper side plate is provided with the lower slide groove 201. The spacing between the two lower side plates is greater than the spacing between the two upper side plates, and the front and rear sides of the rotating shaft support plate 10 abut against the upper side plate. Specifically, the protrusions are provided on both sides, making the structure more stable. The upper side plate, the lower side plate and the rotating shaft support plate 10 abut against each other in sequence, making the structure more stable and preventing shaking. In this embodiment, the rotary shaft support plate 10 and the spreading mechanism support block 9 are connected by a rotary shaft support plate fixing bolt 12. The screw connection is convenient for disassembly, and other methods can also be used.

[0027] As an embodiment, the reduction fusion device is provided with a locking device for limiting the position of the rotating shaft support plate 10. The position of the rotating shaft support plate 10 can be adjusted left and right, and locked to ensure stable use, and conventional methods can be used. In this embodiment, the locking device includes a rotating shaft limiting plate 3, the rotating shaft support plate 10 is provided with a cylindrical protrusion, the cylindrical protrusion passes through the upper slide groove 101 and the lower slide groove 201, and the rotating shaft limiting plate 3 is provided with a locking hole that matches the cylindrical protrusion. The locking can be performed at several specific distances, or a continuous distance can be used for locking, which can be selected by the user. Preferably, the number of the clamping holes is 3, and the clamping holes are interconnected. The reduction fusion device also includes a rotating shaft limit plate fixing bolt 13, which is screwed to the rotating shaft support plate 10 and presses the rotating shaft limit plate 3 against the upper cover 1 or the lower cover 2. After adjusting the position of the rotating shaft support plate 10, the rotating shaft limit plate 3 can be fixed by tightening the rotating shaft limit plate fixing bolt 13, or the rotating shaft limit plate 3 and the upper cover 1 can be directly fixed with screws. The rotating shaft limit plate 3 is used to fix the position of the rotating shaft (i.e., the rotating shaft support plate 10) to prevent the rotating shaft from axial sliding or radial displacement, thereby ensuring the structural stability and operational safety of the device. The limit plate precisely matches the size of the rotating shaft, limits the axial degree of freedom, and concentrates the movement in the designed rotation direction.

[0028] As an embodiment, the support head stud 8 includes a first diameter portion, a second diameter portion and a third diameter portion from left to right, the diameter of the second diameter portion is smaller than the first diameter portion and the third diameter portion, the right side portion of the support structure support head 6 is recessed to the left to form a first rotation groove, the first rotation groove corresponds to the first diameter portion, and the right side of the support structure support head 6 is connected to a support head stud limiting block 7, the support head stud limiting block 7 is penetrated by a support head stud through hole in the left and right directions, the position of the support head stud through hole corresponds to the first rotation groove, the diameter of the support head stud through hole is smaller than the diameter of the first diameter portion, and larger than the diameter of the second diameter portion. The support head 6 of the support structure is fixedly installed with the support head stud limit block 7 by the support head stud limit block fixing bolt 14. The support head stud limit block 7 is composed of an upper limit plate and a lower limit plate. The upper limit plate is provided with an upper limit hole at the bottom, and the lower limit plate is provided with a lower limit hole at the top. The upper limit hole and the lower limit hole are combined to form the support head stud through hole. The two-part structure is convenient for installing the support head stud 8. The first diameter part and the second diameter part are screwed, or the first diameter part is made of elastic material, which is convenient for installing the support head stud 8. It should be further explained that the use of other components to achieve the above-mentioned effects should all fall within the inventive concept of the present invention and should fall within the protection scope of the present invention.

[0029] The combined structural design is adopted, and the pushing structure is composed of an upper cover 1, a lower cover 2, an upper cover pushing rod 4, a lower cover pushing rod 5, a pushing structure support head 6, a support head stud limit block 7 and a support head stud 8. The pushing and resetting operation of the intervertebral space is achieved by rotating and pushing the support head stud. The upper cover pushing rod 4 and the lower cover pushing rod 5 are respectively arranged inside the upper cover 1 and the lower cover 2, and are expanded outward by pushing at an angle, so that the upper and lower covers are opened, thereby achieving the purpose of pushing the atlantoaxial lateral mass and relieving nerve compression. The support head stud 8 is tightened by the support head stud tightening rod 11, and the stud is pushed forward, pushing the limit block 7 and the support head 6 forward, and the support head drives the push rod to move, and the entire pushing process is stable and controllable.

[0030] The ends of the swivel support plate 10 can be adjusted circumferentially along the waist holes at the rear ends of the upper and lower covers 1 and 2, setting the device's center of rotation to achieve different opening angles and distances. After adjustment, the swivel limiter plate 3 locks the support plate in place to prevent swivel deviation caused by manipulation or stress during surgery, ensuring the accuracy of the push-out path and the stability of the reset direction.

[0031] The support stud 8, acting as the primary force source, generates an axial propulsion force driven by the tightening rod 11, pushing the support stud limit block 7 and the push-opening structure support stud 6 forward. The support stud further acts on the push rod, pushing the upper cover 1 and lower cover 2 apart. The push-opening mechanism support block 9 provides effective support reaction force for the support stud, ensuring a stable force transmission path during the pushing process, avoiding structural deflection or local force imbalance, and improving the mechanical reliability of the device. A corresponding limit rod can be set according to the position of the limit block 7 to limit the propulsion stroke of the support stud 8, preventing excessive pushing from causing tissue damage or structural deformation, and improving operational safety.

[0032] Preferably, the upper cover 1 and the lower cover 2 are made of materials with good biocompatibility and compressive strength, and have the stability and reliability required for long-term implantation, and are suitable for intervertebral fusion in the atlantoaxial lateral mass region. The various components adopt a modular structural design, which facilitates step-by-step assembly, precise positioning and operation during surgery, improving implant efficiency and operational accuracy. It is particularly suitable for space-constrained areas such as the upper cervical spine. Once pushed open, the device maintains a stable structural form and does not require postoperative disassembly. It is suitable for integrated long-term fixation after vertebral fusion and meets the surgical requirements of bony fusion.

[0033] Achieve safe resetting and precise pushing of the atlantoaxial structure: by setting a pushing mechanism, including a support head stud 8, a support head stud limit block 7 and a pushing structure support head 6, in conjunction with the upper cover pushing rod 4 and the lower cover pushing rod 5, the support head stud 8 rotates under the drive of the rotating tightening rod 11, driving the limit block 7 to push the support head 6 to move axially, thereby achieving a pushing action. This structure realizes the mechanical drive of rotation-linear conversion, and the opening action is soft and controllable, meeting the needs of complex cervical spine areas for delicate operations. By adjusting the circumferential position of the two ends of the rotary shaft support plate 10 in the rear end waist holes of the upper cover 1 and the lower cover 2, and fixing it through the rotary shaft limit plate 3, the front and rear adjustment of the pushing center position can be achieved, thereby obtaining different opening angles and pushing distances to adapt to the anatomical differences of different individual patients.

[0034] The dynamic structure transmits clear force, ensuring a smooth and stable opening process: The support head stud limiter 7 connects the support head stud 8 with the push-opening structure support head 6, achieving a coordinated rotation-movement force transmission. The compact structure and clear transmission path provide excellent responsiveness and mechanical stability during surgery. The push-opening mechanism support block 9 provides rigid support to prevent the support head structure from deflecting or deforming during opening.

[0035] Secure fixation and bone fusion-promoting properties: The upper and lower covers 1 and 2 are designed with interlocking holes and tooth-like structures. Once pushed into place, they securely fit together, preventing postoperative displacement. This structural design also facilitates bone growth within the pores, providing a reliable support for subsequent bone fusion.

[0036] Reduced intraoperative risks, convenient and efficient operation: The device's spiral structure allows for precise control of the degree of expansion, resulting in a slow, controlled opening process, preventing instantaneous displacement from compressing nerves and blood vessels. The modular connection and clear functionality of each component facilitate rapid intraoperative assembly, improve surgical efficiency, and reduce the risk of misoperation.

[0037] Wide adaptability and high clinical promotion value: This fusion device is not only suitable for correction and fixation of atlantoaxial dislocation, but can also adapt to various types of atlantoaxial instability or subluxation surgeries. It can be promoted and applied in the treatment of multiple causes such as trauma, degeneration, infection, congenital abnormalities, etc., and has good universality and practicality.

[0038] Working principle: The device mainly realizes the separation and closing of the upper cover 1 and the lower cover 2 through the pushing mechanism. The core components are the rotating shaft support plate 10, the pushing mechanism support block 9, the support head stud 8 and the pushing structure support head 6. When the support head stud tightening rod 11 is operated to rotate the support head stud 8, the support head stud will move forward or backward along the internal thread of the pushing mechanism support block 9. The front end of the support head stud 8 is connected to the pushing structure support head 6, driving the support head to move axially. The front end of the pushing structure support head 6 is connected to the upper cover pushing rod 4 and the lower cover pushing rod 5, and the other end of the push rod is fixedly connected to the upper cover 1 and the lower cover 2 for rotation. When the support head moves forward, the push rod pushes the upper and lower covers outward to open; when the support head retreats, the push rod drives the upper and lower covers to close. The rotating shaft limit plate 3 and the rotating shaft support plate 10 are used to limit the movement trajectory of the pushing mechanism and provide structural rotation support to ensure stable operation of the device.

[0039] Connection method: 1. Install the rotary axis limit plate: Install the rotary axis limit plate 3 at the long waist hole at the rear end of the upper cover 1 so that its four short shafts are fixed with the four round holes of the long waist hole at the rear end of the upper cover by interference fit.

[0040] 2. Buckle the upper and lower covers: Buckle the lower cover 2 with the upper cover 1 and align the long waist hole at the rear end.

[0041] 3. Install the slewing axis support plate: Push the slewing axis support plate 10 in from the rear end and adjust the position of its left and right cylindrical parts so that it enters one of the three limit positions of the slewing axis limit plate 3. Insert the slewing axis limit plate fixing bolts 13 from the outside of the limit plate and screw them into the threaded holes at both ends of the support plate and tighten them.

[0042] 4. Install the push-open mechanism support block: Open the upper cover 1 and lower cover 2, and rotate the cylinders on both sides of the rotary shaft support plate 10 to the open position. Push the push-open mechanism support block 9 in from the front end until it fits against the rotary shaft support plate 10, and secure them with the rotary shaft support plate fixing bolts 12.

[0043] 5. Install the support stud: Insert the support stud 8 from the front end, insert the support stud tightening rod 11 behind the rotary shaft support plate 10, and connect it to the hexagonal hole at the end of the support stud. Rotate the tightening rod to screw the support stud into the internal threaded hole of the push-open mechanism support block 9.

[0044] 6. Connect the push-out structure support head: Install the push-out structure support head 6 into the circular hole at the front end of the support head stud 8, so that it mates with the cylindrical groove at the front end of the support head stud. Install the two support head stud limiters 7 on the push-out structure support head 6 and tighten them with the support head stud limiter fixing bolts 14 to form a stable connection, so that the support head can move forward and backward when the support head stud rotates.

[0045] 7. Install the upper and lower cover push rods: Install two pairs of upper cover push rods 4 and lower cover push rods 5 respectively, connect one end to the front end of the push-open structure support head 6 through a pin, and connect the other end to the two corners of the front end of the upper cover 1 and the lower cover 2 through a pin to ensure that they can rotate with the movement of the support head.

[0046] This device is designed to precisely control the opening angle and distance of the upper and lower covers through a mechanical structure, thereby achieving the reduction of the axis vertebral prominence and ensuring that no compression is exerted on the peripheral nerves during the reduction process. The device has a reasonable structure, flexible adjustment, and strong practicality and safety.

[0047] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and the embodiments. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An expandable atlantoaxial lateral mass reduction and fusion cage, characterized by: The invention comprises an upper cover (1), a lower cover (2), a rotary shaft support plate (10) and a support head stud tightening rod (11), wherein the bottom of the right side of the upper cover (1) is provided with an upper slide groove (101), the top of the right side of the lower cover (2) is provided with a lower slide groove (201), one end of the rotary shaft support plate (10) passes through the upper slide groove (101) and the lower slide groove (201), the left side of the rotary shaft support plate (10) is connected to the right side of the support block (9) of the support mechanism, and the left side of the support block (9) of the support mechanism is screwed to the support head. On the right side of the stud (8), the left end of the support head stud tightening rod (11) passes through the rotary shaft support plate (10) and the support mechanism support block (9) to connect the right side of the support head stud (8), and the left side of the support head stud (8) is movably connected to the support structure support head (6), and the support structure support head (6) is hinged with an upper cover support push rod (4) and a lower cover support push rod (5), the upper cover support push rod (4) is connected to the upper cover (1), and the lower cover support push rod (5) is connected to the lower cover (2); When in use, the support head stud tightening rod (11) is rotated to drive the support head stud (8) to rotate and move, so that the support structure support head (6) moves, thereby forming the opening and closing of the upper cover (1) and the lower cover (2).

2. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 1, characterized in that: The bottoms of the front and rear sides of the right side of the upper cover (1) are both provided with upper slide grooves (101), the tops of the front and rear sides of the right side of the lower cover (2) are both provided with lower slide grooves (201), and the front and rear sides of the rotary shaft support plate (10) are both provided with cylindrical protrusions, which pass through the upper slide groove (101) and the lower slide groove (201).

3. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 1, characterized in that: The upper cover (1) includes a top plate, and lower side plates are provided on the front and rear sides of the bottom of the top plate, and the upper slide groove (101) is provided on the lower side plates. The lower cover (2) includes a bottom plate, and upper side plates are provided on the front and rear sides of the top of the bottom plate, and the lower slide groove (201) is provided on the upper side plates. The spacing between the two lower side plates is greater than the spacing between the two upper side plates, and the front and rear sides of the rotary shaft support plate (10) abut against the upper side plates.

4. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 1, characterized in that: The rotary shaft support plate (10) and the spreading mechanism support block (9) are connected via rotary shaft support plate fixing bolts (12).

5. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 1, characterized in that: The reduction fusion device is provided with a positioning device for limiting the position of the rotary shaft support plate (10).

6. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 5, characterized in that: The locking device comprises a rotary shaft limiting plate (3), the rotary shaft supporting plate (10) is provided with a cylindrical protrusion, the cylindrical protrusion passes through the upper slide groove (101) and the lower slide groove (201), and the rotary shaft limiting plate (3) is provided with a locking hole matching the cylindrical protrusion.

7. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 6, characterized in that: The number of the clamping holes is 3, and the clamping holes are interconnected. The reduction fusion device also includes a rotary shaft limit plate fixing bolt (13), and the rotary shaft limit plate fixing bolt (13) is screwed to the rotary shaft support plate (10), and the rotary shaft limit plate (3) is pressed against the upper cover (1) or the lower cover (2).

8. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 1, characterized in that: The support head stud (8) includes a first diameter portion, a second diameter portion and a third diameter portion from left to right, the diameter of the second diameter portion is smaller than the first diameter portion and the third diameter portion, the right side of the support structure support head (6) is recessed to the left to form a first rotation groove, the first rotation groove corresponds to the first diameter portion, the right side of the support structure support head (6) is connected to a support head stud limiting block (7), the support head stud limiting block (7) is provided with a support head stud through hole in the left and right directions, the position of the support head stud through hole corresponds to the first rotation groove, the diameter of the support head stud through hole is smaller than the diameter of the first diameter portion and larger than the diameter of the second diameter portion.

9. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 8, characterized in that: The support head (6) of the support structure is fixedly mounted to the support head stud limit block (7) via a support head stud limit block fixing bolt (14). The support head stud limit block (7) is composed of an upper limit plate and a lower limit plate. An upper limit hole is provided at the bottom of the upper limit plate, and a lower limit hole is correspondingly provided at the top of the lower limit plate. The upper limit hole and the lower limit hole are combined to form the support head stud through hole.

10. The expandable atlantoaxial lateral mass reduction and fusion cage according to claim 8, characterized in that: The first diameter portion and the second diameter portion are screw-connected, or the first diameter portion is made of elastic material.

Images