Spinal fracture vertebral body expansion self-distracting structure

Abstract

The application discloses a kind of spinal fracture vertebral body expansion self-propelled structure, belong to medical instrument technical field.It includes stem, the inner side of the stem is slidably connected with sliding rod, and the first end of the sliding rod is stretched out through the stem, the first end is fixedly connected with connecting plate, the connecting plate and the sliding rod are fixedly connected with support net between, the inner side of the support net is provided with supporting mechanism and jacking mechanism;The application is matched by setting sliding rod and other parts, drives connecting plate to displace towards stem proximal end, forms extrusion force to support net, during, support net gradually arches, to conform to the morphological change of vertebral body, in the mode of multiple-point support, provide stable and uniform support force for compressed deformed vertebral body, simultaneously according to the displacement distance of sliding rod, intuitively grasp supporting degree, significantly reduce the operation difficulty, support net can avoid the risk of rupture caused by extrusion when bearing vertebral body pressure, enhance the clinical practicability and safety of device.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a self-expanding vertebral body expansion structure for spinal fractures. Background Technology

[0002] Vertebral compression fractures are a common type of spinal fracture, characterized by loss of vertebral height and spinal instability. Symptoms include severe pain, limited mobility, and spinal deformity; in severe cases, nerve compression can lead to cauda equina injury. Severe vertebral compression fractures require surgical intervention to reposition the compressed vertebra.

[0003] Existing vertebral kyphoplasty for spinal fractures typically employs balloon dilation. This involves percutaneously inserting an inflatable soft balloon into the compressed vertebral body, inflating it to expand the collapsed trabeculae, restoring vertebral height and creating a cavity, followed by the injection of bone cement for reinforcement. However, this self-expanding vertebral body expansion structure for spinal fractures is complex to operate, has limited balloon dilation effectiveness, and carries a high risk of balloon rupture, which can lead to dilation failure. Therefore, we have designed a self-expanding vertebral body expansion structure for spinal fractures to address these issues. Summary of the Invention

[0004] In view of the problems that existing vertebral body expansion self-opening structures for spinal fractures are complicated to operate, have limited balloon opening effect, and have a high risk of balloon rupture, which will lead to opening failure, the purpose of this invention is to provide a vertebral body expansion self-opening structure for spinal fractures.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A self-expanding vertebral body expansion structure for spinal fractures includes an outer shell, a rod slidably connected to the inner side of the outer shell, a sliding rod slidably connected to the inner side of the rod, and a first end of the sliding rod extending through the rod. A connecting plate is fixedly connected to the first end, and a support net is fixedly connected between the connecting plate and the sliding rod. A support mechanism and a lifting mechanism are provided on the inner side of the support net. The support mechanism includes four sets of first connecting seats fixedly connected to the inner side of the support net. Each set of first connecting seats has multiple first connecting seats. A connecting column is fixedly connected to the inner side of each first connecting seat, and a rotating plate is rotatably connected between each pair of connecting columns in each set.

[0007] Optionally, the support mechanism further includes four sets of L-shaped bars fixedly connected to one end of the rod and one end of the connecting plate. Each set of L-shaped bars has two bars, and the top of each L-shaped bar is fixedly connected to one of the first connecting seats. The bottom of the first connecting seat is provided with a connecting component.

[0008] Optionally, the connecting assembly includes multiple sets of second connecting seats disposed on the outer wall of the sliding rod, each set of the second connecting seats having four seats, and an arc plate fixedly connected between every two second connecting seats. A limiting plate is fixedly connected to one side of each of the two second connecting seats. Two first limiting grooves are disposed on the outer wall of the sliding rod, and multiple first limiting blocks are slidably connected to the inner sides of the two first limiting grooves. Each of the first limiting blocks is fixedly connected to one of the second connecting seats.

[0009] Optionally, the connecting assembly further includes a first telescopic plate slidably connected to the inner side of the second connecting seat, a second telescopic plate slidably connected to the inner side of the first telescopic plate, a third telescopic plate slidably connected to the inner side of the second telescopic plate, a fourth telescopic plate slidably connected to the inner side of the third telescopic plate, a fifth telescopic plate slidably connected to the inner side of the fourth telescopic plate, and the fifth telescopic plate is fixedly connected to the first connecting seat.

[0010] Optionally, the lifting mechanism includes a first elastic block fixedly connected between the inner sides of the second telescopic plate and the first telescopic plate, a second elastic block fixedly connected between the inner side of the second telescopic plate and the third telescopic plate, a third elastic block fixedly connected between the inner side of the third telescopic plate and the fourth telescopic plate, and a fourth elastic block fixedly connected between the inner side of the fourth telescopic plate and the fifth telescopic plate.

[0011] Optionally, the elastic coefficients of the fourth elastic block, the third elastic block, the second elastic block, and the first elastic block increase sequentially.

[0012] Optionally, the lifting mechanism further includes a compression spring installed between the inner side of the second connecting seat and the first telescopic plate. A rectangular plate is fixedly connected to one side of the first telescopic plate, and a rectangular bar is fixedly connected to the bottom of the rectangular plate. A rotating wheel is rotatably connected to the inner side of the rectangular bar, and a power assembly is provided at the bottom of the rotating wheel.

[0013] Optionally, the power assembly includes a rotating ring disposed on the outer wall of the sliding rod, and multiple rotating rings are provided, each of which has four inclined surfaces on its outer wall, and the rotating wheel abuts against the inclined surfaces.

[0014] Optionally, the power assembly further includes a rotating rod disposed inside the rod body. The outer wall of the rotating rod has two second limiting grooves. Multiple sets of second limiting blocks are slidably connected to the inner sides of the two second limiting grooves. Each set of second limiting blocks has two blocks. The inner side of each rotating ring has two circular grooves. One end of each second limiting block is rotatably connected to the inner side of one of the circular grooves. An arc-shaped spring is installed between one side of the second limiting block and the circular groove.

[0015] Optionally, the inner side of the sliding rod is provided with a threaded groove, the rotating rod is threadedly connected to the inner side of the threaded groove, and one end of the rotating rod is fixedly connected to a circular plate.

[0016] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:

[0017] In the above scheme, by setting up components such as sliding rods, the connecting plate is moved towards the proximal end of the rod, forming a compressive force on the support net. During this process, the support net gradually arches, thereby conforming to the shape changes of the vertebral body. In a multi-point support manner, it provides stable and uniform support force for the compressed and deformed vertebral body. At the same time, the support force can be intuitively grasped according to the displacement distance of the sliding rod, which significantly reduces the difficulty of operation and greatly improves the convenience and controllability of surgical operation. Meanwhile, the support net can avoid the risk of deformation or rupture caused by compression when bearing vertebral body pressure, which effectively enhances the clinical applicability and safety of the device.

[0018] By setting up a support mechanism, multiple second, third, fourth, and fifth telescopic plates are driven to move upward. At this time, under the action of the L-shaped strip, multiple second connecting seats are driven to move towards the rod body. This allows multiple rotating plates, second telescopic plates, third telescopic plates, fourth telescopic plates, and fifth telescopic plates to form a multi-section arch to support the support net. This allows the multi-section rotating plates to disperse a single concentrated load into a multi-node support force, avoiding the stress concentration problem of traditional single support mechanisms. At the same time, the support net and the multi-section arch structure form a three-dimensional frame support, further improving the stability of the device.

[0019] By setting up components such as a third elastic block, the support net is tightened, thereby improving the support of the support net and increasing the contact area between the support net and the compressed cone. This avoids the point contact defects of traditional rigid supports, forming multi-point interlocking fixation, and further improving the stability of the device.

[0020] By setting up a lifting mechanism, the first telescopic plate is moved towards the first connecting seat, thereby driving multiple first connecting seats to extend outward. This allows the support net to be radially expanded, increasing the contact area between the support net and the compressed vertebra, thus improving the support effect on the compressed vertebra. At the same time, the flattened support net evenly transmits the load of the vertebra through the first connecting seat, avoiding stress concentration caused by local protrusions in traditional arched structures, thereby improving the stability of the device. Attached Figure Description

[0021] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0022] Figure 1 This is a schematic diagram of the mechanism of the present invention;

[0023] Figure 2 This is a schematic diagram of the outer shell structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the support mesh structure of the present invention;

[0025] Figure 4 This is a cross-sectional view of the present invention;

[0026] Figure 5 This is an exploded view of the sliding rod and rotating rod of the present invention;

[0027] Figure 6 This is a cross-sectional view of the support mechanism of the present invention;

[0028] Figure 7 This is a partial structural diagram of the support mechanism of the present invention;

[0029] Figure 8 This is an exploded view of the sliding rod, rotating rod, and rotating ring of the present invention.

[0030] Figure 9 This is a schematic diagram of the first telescopic plate structure of the present invention;

[0031] Figure 10 This is a cross-sectional view of the lifting mechanism of the present invention;

[0032] Figure 11 This is a schematic diagram of the rotating ring structure of the present invention;

[0033] Figure 12 This is a schematic diagram of the second limiting block structure of the present invention.

[0034] [Figure Labels]

[0035] 1. Outer shell; 2. Sliding rod; 3. Support mesh; 4. Connecting plate; 5. L-shaped strip; 6. First connecting seat; 7. Connecting column; 8. Rotating plate; 9. Rotating rod; 10. Circular plate; 11. First limiting groove; 12. First limiting block; 13. Second connecting seat; 14. Arc plate; 15. Second limiting groove; 16. Second limiting block; 17. Rotating ring; 18. Inclined surface; 19. Limiting plate; 20. Rectangular plate; 21. Rectangular strip; 22. Rotating wheel; 23. First telescopic plate; 24. First elastic block; 25. Second telescopic plate; 26. Second elastic block; 27. Third telescopic plate; 28. Third elastic block; 29. ​​Fourth telescopic plate; 30. Fourth elastic block; 31. Fifth telescopic plate; 32. Compression spring; 33. Rod body; 34. Circular groove; 35. Arc spring.

[0036] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0038] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0039] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0040] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0041] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0042] like Figures 1 to 12 As shown, this embodiment of the invention provides a self-expanding vertebral body expansion structure for spinal fractures, including a shell 1. A rod 33 is slidably connected to the inner side of the shell 1, and a sliding rod 2 is slidably connected to the inner side of the rod 33. The first end of the sliding rod 2 extends through the rod 33, and a connecting plate 4 is fixedly connected to the first end. A support net 3 is fixedly connected between the connecting plate 4 and the sliding rod 2. A support mechanism and a lifting mechanism are provided on the inner side of the support net 3. The support mechanism includes four sets of first connecting seats 6 fixedly connected to the inner side of the support net 3. Each set of first connecting seats 6 has multiple seats. A connecting column 7 is fixedly connected to the inner side of each first connecting seat 6. A rotating plate 8 is rotatably connected between each pair of connecting columns 7 in each set.

[0043] The outer wall of the sliding rod 2 and the end of the rod body 33, as well as the outer wall of the rod body 33 and the end of the outer shell 1, are all provided with snap-locking structures, which can fix the sliding rod 2 and the rod body 33, and the outer shell 1 and the rod body 33 respectively. For example, the outer wall of the rod body 33 and the proximal inner wall of the outer shell 1, and the outer wall of the sliding rod 2 and the proximal inner wall of the rod body 33 are respectively provided with matching ratchet or threaded locking structures (not shown in the figure), which are used to fix the relative positions after adjustment.

[0044] When performing surgery on a patient with a spinal compression fracture, the doctor first precisely implants the outer shell 1 into the compressed vertebral body through percutaneous puncture. Then, a special clamping device is used to firmly grasp the rod 33. Under continuous image monitoring, the rod 33 is extended to an appropriate position to control the extension distance of the support net 3. The outer shell 1 and the rod 33 are fixed with a snap-locking structure, so that the support net 3 can extend to different lengths according to the patient's needs, thereby improving the adaptability of the device.

[0045] After the outer shell 1 and the rod 33 are fixed, the doctor releases the special clamping device from the rod 33 and firmly grips the sliding rod 2. The doctor then gradually pulls out the sliding rod 2 with uniform force. As the rod 33 retracts, it causes the connecting plate 4 to move towards the proximal end of the rod 33, creating a compressive force on the support net 3. During this process, the support net 3 gradually arches, conforming to the morphological changes of the vertebral body. This multi-point support provides stable and uniform support for the compressed and deformed vertebral body. To ensure the safety and accuracy of the reduction process, the doctor uses intraoperative fluoroscopy to observe the vertebral body reduction status in real time after each section of the pull-out operation. When the image shows compression... When the vertebral body returns to its pre-fracture state under the support of the support net 3, the doctor immediately stops the removal of the sliding rod 2 and quickly uses the latch to lock and fix the rod 33 to the sliding rod 2, so that the support net 3 maintains the current support angle and continuously provides stable support for the vertebral body. This allows the doctor to intuitively grasp the support force based on the displacement distance of the sliding rod 2, significantly reducing the difficulty of operation and greatly improving the convenience and controllability of the surgical operation. At the same time, the support net 3 can avoid the risk of deformation or breakage caused by compression when bearing vertebral body pressure, effectively enhancing the clinical practicality and safety of the device and providing a more reliable minimally invasive treatment option for patients with spinal fractures.

[0046] like Figures 2 to 10 As shown, the support mechanism also includes four sets of L-shaped bars 5 fixedly connected to one end of the rod 33 and one end of the connecting plate 4. Each set of L-shaped bars 5 has two bars, and the top of each L-shaped bar 5 is fixedly connected to a first connecting seat 6. The bottom of the first connecting seat 6 is provided with a connecting assembly. The connecting assembly includes multiple sets of second connecting seats 13 disposed on the outer wall of the sliding rod 2. Each set of second connecting seats 13 has four seats, and an arc plate 14 is fixedly connected between every two second connecting seats 13. A limiting plate 19 is fixedly connected to one side of each of the two second connecting seats 13. Two first connecting plates 19 are provided on the outer wall of the sliding rod 2. The limiting groove 11 has multiple first limiting blocks 12 slidably connected to the inner side of each of the two first limiting grooves 11, and each first limiting block 12 is fixedly connected to a second connecting seat 13; the connecting assembly also includes a first telescopic plate 23 slidably connected to the inner side of the second connecting seat 13, a second telescopic plate 25 slidably connected to the inner side of the first telescopic plate 23, a third telescopic plate 27 slidably connected to the inner side of the second telescopic plate 25, a fourth telescopic plate 29 slidably connected to the inner side of the third telescopic plate 27, a fifth telescopic plate 31 slidably connected to the inner side of the fourth telescopic plate 29, and the fifth telescopic plate 31 is fixedly connected to the first connecting seat 6;

[0047] As the connecting plate 4 moves toward the rod 33, it simultaneously drives the four L-shaped bars 5 to move toward the rod 33. Under the action of the L-shaped bars 5, multiple rotating plates 8 are driven to rotate, which in turn drives multiple second telescopic plates 25, third telescopic plates 27, fourth telescopic plates 29, and fifth telescopic plates 31 to move upward. At this time, under the action of the L-shaped bars 5, multiple second connecting seats 13 are driven to move toward the rod 33. This causes the multiple rotating plates 8, second telescopic plates 25, third telescopic plates 27, fourth telescopic plates 29, and fifth telescopic plates 31 to form a multi-section arch to support the support net 3. This allows the multiple rotating plates 8 to distribute the single concentrated load into multi-node support forces, avoiding the stress concentration problem of traditional single support mechanisms. At the same time, the support net 3 and the multi-section arch structure form a three-dimensional frame support, further improving the stability of the device.

[0048] like Figures 3 to 12 As shown, the lifting mechanism includes a first elastic block 24 fixedly connected between the inner sides of the second telescopic plate 25 and the first telescopic plate 23; a second elastic block 26 fixedly connected between the inner side of the second telescopic plate 25 and the third telescopic plate 27; a third elastic block 28 fixedly connected between the inner side of the third telescopic plate 27 and the fourth telescopic plate 29; and a fourth elastic block 30 fixedly connected between the inner side of the fourth telescopic plate 29 and the fifth telescopic plate 31. The elastic coefficients of the fourth elastic block 30, the third elastic block 28, the second elastic block 26, and the first elastic block 24 increase sequentially.

[0049] Before the connecting plate 4 moves towards the rod 33, the first elastic block 24, the second elastic block 26, the third elastic block 28, and the fourth elastic block 30 cause the second telescopic plate 25, the third telescopic plate 27, the fourth telescopic plate 29, and the fifth telescopic plate 31 to tend to move upward. At the same time, when the connecting plate 4 moves towards the rod 33, the first elastic block 24, the second elastic block 26, the third elastic block 28, and the fourth elastic block 30 reduce the resistance to the upward movement of the second telescopic plate 25, the third telescopic plate 27, the fourth telescopic plate 29, and the fifth telescopic plate 31. When the connecting plate 4 stops moving, the first elastic block 24, the second elastic block 26, the third elastic block 28, and the fourth elastic block 30 tighten the support net 3, thereby improving the support strength of the support net 3 and increasing the contact area between the support net 3 and the compressed cone, avoiding the point contact defects of traditional rigid supports, forming multi-point interlocking fixation, and further improving the stability of the device.

[0050] like Figures 5 to 12As shown, the lifting mechanism also includes a compression spring 32 installed between the inner side of the second connecting seat 13 and the first telescopic plate 23. A rectangular plate 20 is fixedly connected to one side of the first telescopic plate 23, and a rectangular bar 21 is fixedly connected to the bottom of the rectangular plate 20. A rotating wheel 22 is rotatably connected to the inner side of the rectangular bar 21, and a power assembly is provided at the bottom of the rotating wheel 22. The power assembly includes a rotating ring 17 disposed on the outer wall of the sliding rod 2, and multiple rotating rings 17 are provided. Each rotating ring 17 has four inclined surfaces 18 on its outer wall, and the rotating wheel 22 abuts against the inclined surface 18. The power assembly also includes a rod body The inner side of the rotating rod 9 has two second limiting grooves 15 on its outer wall. Multiple sets of second limiting blocks 16 are slidably connected to the inner side of the two second limiting grooves 15. Each set of second limiting blocks 16 has two blocks. The inner side of each rotating ring 17 has two circular grooves 34. One end of each second limiting block 16 is rotatably connected to the inner side of one circular groove 34. An arc spring 35 is installed between one side of the second limiting block 16 and the circular groove 34. The inner side of the sliding rod 2 has a threaded groove. The rotating rod 9 is threadedly connected to the inner side of the threaded groove. One end of the rotating rod 9 is fixedly connected to the circular plate 10.

[0051] When the connecting plate 4 stops moving, the support net 3 is supported to the designated position. At this time, the doctor can use the clamping mechanism to hold the circular plate 10 and twist the circular plate 10 clockwise, thereby driving the rotating rod 9 to rotate. This drives multiple rotating rings 17 to rotate, thereby driving multiple rotating wheels 22 to move towards the rectangular plate 20 under the action of multiple inclined surfaces 18. This drives the rectangular plate 20 to move towards the first connecting seat 6, thereby driving the first telescopic plate 23 to move towards the first connecting seat 6. This drives multiple first connecting seats 6 to extend outward, so that the support net 3 can be radially expanded. This increases the contact area between the support net 3 and the compressed vertebral body, thereby improving the support effect on the compressed vertebral body. At the same time, the flattened support net 3 evenly transmits the vertebral body load through the first connecting seat 6, avoiding stress concentration caused by local protrusions in the traditional arched structure, thereby improving the stability of the device.

[0052] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A self-expanding vertebral body expansion structure for spinal fractures, characterized in that, include: The outer shell has a rod slidably connected to its inner side, and a sliding rod slidably connected to its inner side. The first end of the sliding rod extends through the rod and is fixedly connected to the first end. A support net is fixedly connected between the connecting plate and the sliding rod. A support mechanism and a lifting mechanism are provided on the inner side of the support net. The support mechanism includes four sets of first connecting seats fixedly connected to the inner side of the support net. Each set of first connecting seats has multiple first connecting seats. A connecting column is fixedly connected to the inner side of each first connecting seat. A rotating plate is rotatably connected between each pair of connecting columns in each set. The support mechanism also includes four sets of L-shaped bars fixedly connected to one end of the rod and one end of the connecting plate. Each set of L-shaped bars has two bars, and the top of each L-shaped bar is fixedly connected to a first connecting seat. The bottom of the first connecting seat is provided with a connecting component. The connecting assembly includes multiple sets of second connecting seats disposed on the outer wall of the sliding rod. Each set of second connecting seats has four seats, and an arc plate is fixedly connected between every two second connecting seats. A limiting plate is fixedly connected to one side of each of the two second connecting seats. Two first limiting grooves are disposed on the outer wall of the sliding rod. Multiple first limiting blocks are slidably connected to the inner side of each of the two first limiting grooves, and each first limiting block is fixedly connected to one of the second connecting seats. The connecting assembly further includes a first telescopic plate slidably connected to the inner side of the second connecting seat, a second telescopic plate slidably connected to the inner side of the first telescopic plate, a third telescopic plate slidably connected to the inner side of the second telescopic plate, a fourth telescopic plate slidably connected to the inner side of the third telescopic plate, and a fifth telescopic plate slidably connected to the inner side of the fourth telescopic plate, and the fifth telescopic plate is fixedly connected to the first connecting seat.

2. The self-expanding vertebral body expansion structure for spinal fractures according to claim 1, characterized in that: The lifting mechanism includes a first elastic block fixedly connected between the inner sides of the second telescopic plate and the first telescopic plate, a second elastic block fixedly connected between the inner side of the second telescopic plate and the third telescopic plate, a third elastic block fixedly connected between the inner side of the third telescopic plate and the fourth telescopic plate, and a fourth elastic block fixedly connected between the inner side of the fourth telescopic plate and the fifth telescopic plate.

3. The self-expanding vertebral body expansion structure for spinal fractures according to claim 2, characterized in that: The elastic coefficients of the fourth elastic block, the third elastic block, the second elastic block, and the first elastic block increase sequentially.

4. The self-expanding vertebral body expansion structure for spinal fractures according to claim 3, characterized in that: The lifting mechanism also includes a compression spring installed between the inner side of the second connecting seat and the first telescopic plate. A rectangular plate is fixedly connected to one side of the first telescopic plate, and a rectangular bar is fixedly connected to the bottom of the rectangular plate. A rotating wheel is rotatably connected to the inner side of the rectangular bar, and a power component is provided at the bottom of the rotating wheel.

5. The self-expanding vertebral body expansion structure for spinal fractures according to claim 4, characterized in that: The power assembly includes a rotating ring disposed on the outer wall of the sliding rod, and multiple rotating rings are provided. Each rotating ring has four inclined surfaces on its outer wall, and the rotating wheel abuts against the inclined surfaces.

6. The self-expanding vertebral body expansion structure for spinal fractures according to claim 5, characterized in that: The power assembly also includes a rotating rod disposed inside the rod body. The outer wall of the rotating rod has two second limiting grooves. Multiple sets of second limiting blocks are slidably connected to the inner sides of the two second limiting grooves. Each set of second limiting blocks has two blocks. The inner side of each rotating ring has two circular grooves. One end of each second limiting block is rotatably connected to the inner side of one of the circular grooves. An arc-shaped spring is installed between one side of the second limiting block and the circular groove.

7. The self-expanding vertebral body expansion structure for spinal fractures according to claim 6, characterized in that: The sliding rod has a threaded groove on its inner side, and the rotating rod is threaded to the inner side of the threaded groove. One end of the rotating rod is fixedly connected to a circular plate.

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