Expandable artificial vertebral body and installation tool therefor

Abstract

The application provides a kind of expandable artificial vertebral body and its installation tool, comprising: base, base includes pedestal and at least two fan-shaped inserts; all fan-shaped inserts are arranged on the top surface of pedestal; the thickness of fan-shaped insert is less than the wall thickness of pedestal; the top of each fan-shaped insert is provided with outwardly extending buckle; the bottom surface of buckle, the outer side surface of fan-shaped insert and the top surface of pedestal form a clamping groove; the outer side surface of guide column is provided with external thread of column body, and the outer side surface of guide column is also provided with at least two fan-shaped grooves for inserting fan-shaped insert; the driving member is provided with axial through hole, and the hole wall of axial through hole is provided with internal thread of through hole; the driving member is sleeved on the outside of all fan-shaped inserts and embedded in the clamping groove. The expandable artificial vertebral body of the application can be implanted in human body without expansion, reducing the traction on surrounding tissues and nerves, and can adjust the height in situ after being implanted in human body to restore the ideal vertebral height; the structure is simple, safe and reliable.

Description

[0001] This case is a divisional application of the following patent application:

[0002] Application number: 202010803160.5;

[0003] Application date: August 11, 2020;

[0004] Invention Title: Expandable Artificial Vertebra and its Installation Tool Technical Field

[0005] This invention relates to the field of orthopedic surgical medical device technology, and in particular to an expandable artificial vertebra and its installation tool. Background Technology

[0006] For patients with vertebral burst fractures, kyphosis, or spinal tumors, it is often necessary to remove the damaged or diseased vertebrae. After removal, vertebral body replacements are used to maintain normal spinal load and physiological curvature. In recent years, artificial vertebrae have gained widespread recognition in the field of spinal tumors as an effective vertebral body replacement and are widely used for the reconstruction of spinal stability after vertebral tumor resection.

[0007] Generally, artificial vertebrae are fixed, meaning their height cannot be adjusted after implantation. Strict selection of specifications is required before implantation, making it difficult to achieve the ideal vertebral height. Designing a simple, easily deployable, and height-adjustable artificial vertebra is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of the shortcomings of the prior art described above, the technical problem solved by the present invention is to provide an expandable artificial vertebra and its installation tool.

[0009] To achieve the above and other related objectives, the present invention provides an expandable artificial vertebral body, comprising:

[0010] A base, comprising a pedestal and at least two sector-shaped inserts; the pedestal is cylindrical and has a hollow structure with a circular cavity; all the sector-shaped inserts are disposed on the top surface of the pedestal and are evenly distributed along the circumference of the pedestal; the length direction of each sector-shaped insert is in the same direction as the axial direction of the pedestal; the thickness of each sector-shaped insert is less than the wall thickness of the pedestal; each sector-shaped insert has an outwardly extending buckle at its top; the bottom surface of the buckle, the outer surface of the sector-shaped insert, and the top surface of the pedestal form a groove;

[0011] The guide post is cylindrical, with external threads on its outer surface and at least two fan-shaped grooves evenly distributed along its circumference. Each fan-shaped groove corresponds to a fan-shaped insert, and the fan-shaped groove is for inserting the fan-shaped insert. The length direction of each fan-shaped groove is in the same direction as the axial direction of the guide post.

[0012] The driving component is cylindrical and has an axial through hole. The wall of the axial through hole has an internal thread corresponding to the external thread of the cylinder. The driving component is sleeved on the outside of all the fan-shaped inserts and embedded in the slot.

[0013] Preferably, the top surface of the guide post is provided with a platform; the bottom surface of the platform is provided with a bottom groove, the bottom groove is a fan-shaped structure, the bottom groove corresponds one-to-one with the fan-shaped groove, the bottom groove is directly above the fan-shaped groove, and the bottom groove communicates with the fan-shaped groove.

[0014] Preferably, the expandable artificial vertebra further includes at least two endplates, one of which is mounted on the bottom surface of the base, and the other is mounted on the top surface of the platform.

[0015] Furthermore, both the bottom surface of the base and the top surface of the platform are provided with protrusions, and the outer peripheral surface of the protrusions is an octagonal structure; the end plate is provided with a mounting groove for the protrusions to be inserted into, and the cross-section of the mounting groove is quadrilateral; the end plate is also provided with two oblong slots, which are arranged opposite to each other and are located on the outer side of the two opposite sides of the mounting groove.

[0016] Preferably, the base includes a base plate and a side plate surrounding the base plate and extending upward therefrom; the top surface of the side plate is the top surface of the base; the side plate is provided with at least two hollow structures, the hollow structures extending to the top surface of the side plate, each hollow structure being located between two fan-shaped inserts; all the hollow structures divide the side plate into multiple side plate units, each side plate unit being located below a corresponding fan-shaped insert, and each side plate unit being insertable into the fan-shaped groove.

[0017] Preferably, the expandable artificial vertebra is made of polymer material or polymer-based composite material.

[0018] Preferably, along the circumferential direction of the outer side surface of the driving member, a lower edge portion protruding outward is provided at the lower part of the driving member, the lower edge portion extending downward and fitting onto the outer side surface of the base; along the circumferential direction of the lower edge portion, a plurality of limiting grooves are provided on the bottom surface of the lower edge portion; the bottom surface of the driving member is an annular plane, and the bottom surface of the driving member contacts the top surface of the base; the base is provided with a locking through hole, the axial direction of the locking through hole being perpendicular to the axial direction of the base; a locking member is installed in the locking through hole and can move relative to the axial direction of the locking through hole.

[0019] Furthermore, the base is also provided with a gear mounting hole, the axial direction of which is perpendicular to the axial direction of the base.

[0020] The present invention also relates to an installation tool for an expandable artificial vertebra, for use with the expandable artificial vertebra, the installation tool comprising: a locking screwdriver and a rotating gear assembly; the locking screwdriver is used to drive the locking member to move axially along the locking through hole; the rotating gear assembly comprises a mandrel, a rotating shaft and a gear, the head of the rotating shaft is fitted with the gear, the mandrel is inserted into the rotating shaft, the mandrel and the rotating shaft are coaxially arranged, and the head of the mandrel passes through the gear; the head of the mandrel is provided with an external thread, and the head of the mandrel is used to pass into the gear mounting hole; the gear can mesh with the limiting groove.

[0021] As described above, the expandable artificial vertebra and its installation tool of the present invention have the following beneficial effects:

[0022] The expandable artificial vertebra of the present invention can be implanted into the human body without expansion, reducing traction on surrounding tissues and nerves. After implantation, the height can be adjusted in situ to restore the ideal vertebral height. The structure is simple and safe and reliable. Attached Figure Description

[0023] Figure 1 The diagram shown is a three-dimensional structural schematic of the expandable artificial vertebra in this embodiment.

[0024] Figure 2 The diagram shown is a side view of the expandable artificial vertebra in this embodiment.

[0025] Figure 3 Displayed as Figure 2 A schematic diagram of the cross-sectional structure along the AA direction.

[0026] Figure 4 The diagram shown is a three-dimensional structural schematic of the base of the expandable artificial vertebra in this embodiment.

[0027] Figure 5 The diagram shown is a side view of the base of the expandable artificial vertebra in this embodiment.

[0028] Figure 6 The diagram shows a three-dimensional structural schematic of the drive component of the expandable artificial vertebra in this embodiment.

[0029] Figure 7 The diagram shown is a cross-sectional view of the drive component of the expandable artificial vertebra in this embodiment.

[0030] Figure 8 The diagram shows a three-dimensional structural schematic of the guide column of the expandable artificial vertebra in this embodiment.

[0031] Figure 9 The diagram shown is a three-dimensional structural schematic of the endplate of the expandable artificial vertebra in this embodiment.

[0032] Figure 10 This is a three-dimensional structural diagram showing the locking screwdriver inserted into the locking through hole of the expandable artificial vertebra in this embodiment.

[0033] Figure 11 The diagram shows a three-dimensional structure of the rotating gear component in this embodiment when it meshes with the limiting groove of the expandable artificial vertebra.

[0034] Figure 12 The diagram shown is a three-dimensional structural schematic of the rotating gear component in this embodiment.

[0035] Explanation of icon numbers

[0036] 100 bases

[0037] 101 Locking Through Hole

[0038] 102 Gear mounting holes

[0039] 103 Locking components

[0040] 110 sector insert

[0041] 120 buckle

[0042] 130 card slot

[0043] 140 Hollowed-out structure

[0044] 150 base

[0045] 151 Top surface of the base

[0046] 152 seat base plates

[0047] 153 seat side panels

[0048] 1531 Side Panel Unit

[0049] 200 guide column

[0050] 210 External thread of a cylinder

[0051] 220 fan-shaped groove

[0052] 230 Platform

[0053] 231 Bottom Groove

[0054] 300 drive unit

[0055] 310 Axial Through Hole

[0056] 320 through hole internal thread

[0057] 330 Lower edge

[0058] 331 Limiting groove

[0059] 400 Endplate

[0060] 410 mounting slot

[0061] 420 oblong groove

[0062] 430 Conical protrusion

[0063] 500 protrusions

[0064] 600 locking screwdriver

[0065] 700 Rotating Gear Components

[0066] 710 Rotating Shaft

[0067] 720 Gear

[0068] 730 spindle

[0069] Thickness of the T-shaped insert Detailed Implementation

[0070] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0071] Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0072] like Figures 1 to 12 As shown, the expandable artificial vertebral body of this embodiment includes:

[0073] The base 100 includes a base 150 and at least two sector-shaped inserts 110. The base 150 is cylindrical and has a hollow structure with a circular cavity. All the sector-shaped inserts 110 are disposed on the top surface 151 of the base 150 and are evenly distributed along the circumference of the base 150. The length direction of each sector-shaped insert 110 is in the same direction as the axial direction of the base 150. The thickness T of the sector-shaped insert 110 is less than the wall thickness of the base 150. Each sector-shaped insert 110 has an outwardly extending buckle 120 at its top. The bottom surface of the buckle 120, the outer surface of the sector-shaped insert 110, and the top surface 151 of the base 150 form a groove 130.

[0074] The guide post 200 is cylindrical, and has an external thread 210 on its outer surface. At least two sector-shaped grooves 220 are also provided on the outer surface of the guide post 200, with all sector-shaped grooves 220 evenly distributed along the circumference of the guide post 200. Each sector-shaped groove 220 corresponds to a sector-shaped insert 110, and the sector-shaped groove 220 allows the sector-shaped insert 110 to be inserted. The length direction of each sector-shaped groove 220 is in the same direction as the axial direction of the guide post 200.

[0075] The driving component 300 is cylindrical and has an axial through hole 310. The wall of the axial through hole 310 has an internal through hole thread 320 corresponding to the external thread 210 of the cylinder. The driving component 300 is sleeved on the outside of all the fan-shaped inserts 110 and is embedded in the slot 130.

[0076] In this embodiment, during the installation of the expandable artificial vertebra, the drive component 300 is first inserted into the slot 130, and then the guide post 200 is screwed into the drive component 300 via the threaded joint between the drive component 300 and the guide post 200. At this time, the guide post 200, the drive component 300, and the base 100 form a single structure that can withstand the load transmitted by the cervical vertebrae. When the drive component 300 is rotated clockwise or counterclockwise, it can drive the guide post 200 to move axially along the base 150, thereby achieving height adjustment of the artificial vertebra.

[0077] In this embodiment, there are three fan-shaped grooves 220 and three fan-shaped inserts 110. When the fan-shaped insert 110 is inserted into the fan-shaped groove 220, the relative rotation between the guide post 200 and the base 150 will be restricted, and the guide post 200 can only run in a straight line along the length direction of the fan-shaped groove 220.

[0078] The drive component 300 has an internal through-hole thread 320, which matches the external thread 210 of the guide post 200. The drive component 300 is inserted into the slot 130 through the elastic deformation of the fan-shaped insert 110. The slot 130 restricts the vertical displacement of the drive component 300, allowing it to rotate only around the axis of the base 150. The large contact area between the drive component 300 and the top surface 151 of the base 150 reduces the stress level at the contact point.

[0079] A platform 230 is provided on the top surface of the guide post 200; a bottom groove 231 is provided on the bottom surface of the platform 230. The bottom groove 231 has a fan-shaped structure, and the bottom groove 231 corresponds one-to-one with the fan-shaped groove 220. The bottom groove 231 is located directly above the fan-shaped groove 220, and the bottom groove 231 communicates with the fan-shaped groove 220. The bottom groove 231 is used to accommodate the buckle 120 at the top of the fan-shaped insert 110. This structure can effectively reduce the minimum height of the artificial vertebra.

[0080] The expandable artificial vertebral body also includes at least two endplates 400, one of which is mounted on the bottom surface of the base 150, and the other is mounted on the top surface of the platform 230. The endplates 400 can be configured with various thicknesses and angles, allowing for selection and adaptation based on the patient's anatomical features during surgery. Selecting a suitable endplate 400 for installation on the expandable artificial vertebral body ensures full restoration of vertebral height, increases the contact area, and reduces the risk of stress shielding or endplate 400 subsidence.

[0081] Both the bottom surface of the base 150 and the top surface of the platform 230 are provided with protrusions 500, and the outer peripheral surface of the protrusions 500 is an octagonal structure; the end plate 400 is provided with a mounting groove 410 for the protrusions 500 to be inserted into, and the cross-section of the mounting groove 410 is quadrilateral; the end plate 400 is also provided with two oblong slots 420, which are arranged opposite to each other and are located on the outer side of the two opposite sides of the mounting groove 410.

[0082] The protrusion 500 facilitates the installation of the endplate 400. The outer periphery of the protrusion 500 has an octagonal structure, and the way the endplate 400 engages with the octagonal protrusion 500 allows for eight installation angles, making it suitable for various surgical approaches such as anterior, posterior, lateral, anterior-lateral, and posterior-lateral. The mounting groove 410 is located in the center of the endplate 400. The two opposite sides of the elongated oval slot 420 in the quadrilateral mounting groove 410 are tightly fitted with the octagonal protrusion 500. That is, when the protrusion 500 is engaged with the two opposite sides of the elongated oval slot 420 in the quadrilateral mounting groove 410, the quadrilateral mounting groove 410 and the protrusion 500 interfere with each other. During insertion, the endplate 400 is embedded into the octagonal protrusion 500 using the principle of elastic deformation, achieving fixation. The other two sides of the quadrilateral mounting groove 410 are in contact with the other two surfaces of the octagon. These four contact surfaces achieve fixation and positioning of the endplate 400.

[0083] When the endplate 400 is mounted on the base 150 or platform 230, the side of the endplate 400 away from the drive member 300 is a toothed surface, and a tapered protrusion 430 is provided on the side of the endplate 400 away from the drive member 300. During the final process of the artificial vertebral body unfolding, the toothed surface contacts the vertebral bone surface, and the tapered protrusion 430 enters the vertebral bone tissue, which can increase the stability of the artificial vertebral body and reduce the risk of dislocation or misalignment. In this embodiment, there are four tapered protrusions 430.

[0084] Currently, most artificial vertebrae used in clinical practice are made of titanium alloy, with a few being hybrid structures of medical-grade polyetheretherketone (PEEK) and titanium alloy. When titanium alloy artificial vertebrae are used for spinal tumor patients, the following problems mainly arise: 1. The significant difference in modulus between titanium alloy and human bone can easily cause stress shielding, leading to bone resorption and deposition; 2. Titanium alloy appears bright under CT and MRI scans, affecting postoperative imaging assessment of tumor lesions and bone fusion; 3. Titanium alloy blocks radiation, affecting the effectiveness of radiotherapy. The expandable artificial vertebra of this invention is made of polymer materials or polymer-based composite materials. In this embodiment, the polymer material is medical-grade PEEK, and the polymer-based composite material is carbon fiber-reinforced medical-grade PEEK. Compared to existing artificial vertebrae made of titanium alloy, the expandable artificial vertebrae in this embodiment have an elastic modulus similar to that of human bones, less stress shielding, and good biocompatibility, reducing the probability of bone nonunion and subsidence, thus lowering the risk of artificial vertebral body subsidence and bone tissue resorption. The artificial vertebrae made of polymer materials or polymer-based composite materials are non-magnetic and do not shield against X-rays, thus not affecting CT and MRI imaging examinations or subsequent radiotherapy. The expandable artificial vertebra in this embodiment is non-magnetic and can penetrate X-rays, so it does not interfere with CT and MRI examinations of tumor lesions and has no impact on subsequent radiotherapy for cancer patients.

[0085] Along the circumferential direction of the outer side of the driving member 300, a lower edge portion 330 protruding outward is provided at the lower part of the driving member 300. The lower edge portion 330 extends downward and fits onto the outer side of the base 150. Along the circumferential direction of the lower edge portion 330, a plurality of limiting grooves 331 are provided on the bottom surface of the lower edge portion 330. The bottom surface 340 of the driving member 300 is an annular plane and contacts the top surface of the base 150. The base 150 is provided with a locking through hole 101, and the axial direction of the locking through hole 101 is perpendicular to the axial direction of the base 150. The locking member 103 is installed in the locking through hole 101 and can move relative to the axial direction of the locking through hole 101.

[0086] The driving member 300 has a lower edge portion 330 at its lower part, so the outer diameter of the driving member 300 is smaller than the outer diameter of the lower edge portion 330; the top surface of the base 150 supports the bottom surface 340 of the driving member 300; multiple limiting grooves 331 form a toothed structure. After the artificial vertebra is opened, the locking member 103 is driven to move outward along the axial direction of the locking through hole 101 using a locking screwdriver 600. The locking member 103 can extend into the limiting groove 331, so the driving member 300 cannot rotate, and the height of the artificial vertebra cannot be changed. In this embodiment, the locking through hole 101 is a threaded hole, and the locking member 103 is a screw.

[0087] The base 150 is also provided with a gear mounting hole 102, the axis of which is perpendicular to the axis of the base 150. When the head of the mandrel 730 is inserted into the gear mounting hole 102, the rotating shaft 710 rotates, and the gear 720 on the rotating shaft 710 meshes with the limiting groove 331. This allows for convenient lifting and lowering using the threaded pair between the guide post 200 and the drive member 300. The gear mounting hole 102 is used for holding the artificial vertebra and for fixing the mandrel 730 when the gear 720 rotates.

[0088] The installation tool for the expandable artificial vertebra in this embodiment includes: a locking screwdriver 600 and a rotating gear component 700; the locking screwdriver 600 is used to drive the locking member 103 to move axially along the locking through hole 101; the rotating gear component 700 includes a spindle 730, a rotating shaft 710 and a gear 720, the gear 720 is mounted on the head of the rotating shaft 710, the spindle 730 is inserted into the rotating shaft 710, the spindle 730 and the rotating shaft 710 are coaxially arranged, and the head of the spindle 730 passes through the gear 720; the head of the spindle 730 is provided with external threads, and the head of the spindle 730 is used to pass into the gear mounting hole 102, the gear mounting hole 102 is provided with internal threads; the gear 720 can mesh with the limiting groove 331.

[0089] The head of the spindle 730 of the rotating gear component 700 is installed in the threaded hole of the base 150, so that the gear 720 meshes with the multiple limiting grooves 331 at the bottom of the lower edge 330. Rotating the rotating shaft 710 in the rotating gear component 700 will drive the gear 720 to rotate, thereby achieving height adjustment. After the artificial vertebra is opened into place, the locking member 103 is tightened clockwise with the locking screwdriver 600 to completely lock it.

[0090] The base 150 includes a base plate 152 and a side plate 153 surrounding the base plate 152 and extending upward therefrom. The top surface of the side plate 153 is the top surface 151 of the base 150. The side plate 153 has at least two perforated structures 140 extending to the top surface of the side plate 153, each perforated structure 140 positioned between two fan-shaped inserts 110. All the perforated structures 140 divide the side plate 153 into multiple side plate units 1531, each side plate unit 1531 positioned below a corresponding fan-shaped insert 110, and each side plate unit 1531 can be inserted into a fan-shaped groove 220. After the spiral is opened, a cavity is formed between the guide post 200 and the base 150, which can be used to fill bone grafts. The bone graft enters the cavity between the guide post 200 and the base 150 through the perforated structures 140.

[0091] This invention utilizes a simple mechanism to achieve height adjustment, locking, and stable load-bearing of the artificial vertebra, reducing stress levels along the force transmission path. It solves the application challenges of low-strength, low-stiffness polymer materials or polymer-based composite materials in small-sized, expandable artificial vertebral motion mechanisms. This provides a good solution for spinal tumor patients requiring artificial vertebral replacement and subsequent CT, MRI, and radiotherapy.

[0092] The artificial vertebral body of this invention is height-adjustable in situ, simple in structure, safe and reliable, and possesses a high-locking mechanism. The artificial vertebral body, combined with the endplate 400, can closely fit the upper and lower vertebral bodies, increasing the contact area and providing safe, reliable, and highly adaptable stable support for patients with different anatomical features. The way the octagonal protrusion 500 engages with the endplate 400 allows the endplate 400 to be adjusted at multiple angles, making it suitable for various surgical approaches.

[0093] The artificial vertebra of this invention has a smaller height before expansion, which can reduce the traction on surrounding tissues and nerves during implantation; after expansion after implantation, it is easier to obtain the ideal vertebral height; it can be closely integrated with adjacent vertebrae, which can effectively reduce stress concentration and reduce the probability of nonunion and subsidence; and it is easier to obtain the correct physiological curvature and three-dimensional stability of the spine.

[0094] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0095] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A expandable artificial vertebral body, characterized in that, include: A base (100) includes a base (150) and at least two sector-shaped inserts (110); the base (150) is cylindrical and has a hollow structure with a circular cavity; all the sector-shaped inserts (110) are disposed on the top surface (151) of the base (150), and all the sector-shaped inserts (110) are evenly distributed along the circumference of the base (150); the length direction of each sector-shaped insert (110) is in the same direction as the axial direction of the base (150); the thickness of the sector-shaped insert (110) is less than the wall thickness of the base (150); each sector-shaped insert (110) has an outwardly extending buckle (120) at its top. The bottom surface of the buckle (120), the outer side surface of the fan-shaped insert (110), and the top surface (151) of the base (150) form a slot (130); A guide post (200) is cylindrical, and the outer surface of the guide post (200) is provided with a cylindrical external thread (210). The outer surface of the guide post (200) is also provided with at least two fan-shaped grooves (220). All the fan-shaped grooves (220) are evenly distributed along the circumference of the guide post (200); each fan-shaped groove (220) corresponds to a fan-shaped insert (110), and the fan-shaped groove (220) is for the fan-shaped insert (110) to be inserted. When the fan-shaped insert (110) is inserted into the fan-shaped groove (220), the relative rotation between the guide post (200) and the base (150) will be restricted, and the guide post (200) can only run in a straight line along the length direction of the fan-shaped groove (220); the length direction of each fan-shaped groove (220) is in the same direction as the axial direction of the guide post (200); a platform (230) is provided on the top surface of the guide post (200); A driving component (300) is cylindrical and has an axial through hole (310). The wall of the axial through hole (310) has an internal through hole thread (320) corresponding to the external thread (210) of the cylinder. The driving component (300) is sleeved on the outside of all the fan-shaped inserts (110) and embedded in the slot (130). When the drive unit (300) is rotated clockwise or counterclockwise, the drive unit (300) can drive the guide column (200) to move along the axial direction of the base (150); The expandable artificial vertebra has at least two endplates (400), one of which is mounted on the bottom surface of the base (150) and the other is mounted on the top surface of the platform (230); the side of the endplate (400) away from the drive member (300) is a toothed surface, and a tapered protrusion (430) is provided on the side of the endplate (400) away from the drive member (300); Along the circumferential direction of the outer side surface of the driving member (300), a lower edge portion (330) protruding outward is provided at the lower part of the driving member (300), the lower edge portion (330) extends downward, and the lower edge portion (330) is fitted onto the outer side surface of the base (150); along the circumferential direction of the lower edge portion (330), a plurality of limiting grooves (331) are provided on the bottom surface of the lower edge portion (330); the bottom surface (340) of the driving member (300) is an annular plane, and the bottom surface (340) of the driving member (300) contacts the top surface of the base (150); the base (150) is provided with a locking through hole (101), and the axial direction of the locking through hole (101) is perpendicular to the axial direction of the base (150); The locking member (103) is installed in the locking through hole (101) and can move axially relative to the locking through hole (101). The locking member (103) can extend into the limiting groove (331) to limit the rotation of the driving member (300). The base (150) is also provided with a gear mounting hole (102). The axial direction of the gear mounting hole (102) is perpendicular to the axial direction of the base (150). The gear mounting hole (102) is used to hold the artificial vertebra and to fix the spindle (730) when the gear (720) rotates. The gear (720) meshes with the limiting groove (331).

2. The expandable artificial vertebral body according to claim 1, characterized in that: The bottom surface of the platform (230) is provided with a bottom groove (231), which is a fan-shaped structure. The bottom groove (231) corresponds one-to-one with the fan-shaped groove (220). The bottom groove (231) is located directly above the fan-shaped groove (220), and the bottom groove (231) is connected to the fan-shaped groove (220).

3. The expandable artificial vertebral body according to claim 1, characterized in that: The base (150) includes a base plate (152) and a side plate (153) surrounding the base plate (152) and extending upward therefrom; the top surface of the side plate (153) is the top surface (151) of the base (150); the side plate (153) is provided with at least two hollow structures (140), the hollow structures (140) extending to the top surface of the side plate (153), each hollow structure (140) being located between two fan-shaped inserts (110); all the hollow structures (140) divide the side plate (153) into multiple side plate units (1531), each side plate unit (1531) being located below the corresponding fan-shaped insert (110), and each side plate unit (1531) being insertable into the fan-shaped groove (220).

4. The expandable artificial vertebral body according to claim 1, characterized in that: The expandable artificial vertebra is made of polymer materials or polymer-based composite materials.

5. An installation tool for an expandable artificial vertebra, used for the expandable artificial vertebra as described in claim 1, characterized in that, The installation tools include: a locking screwdriver (600) and a rotating gear (700); The locking screwdriver (600) is used to drive the locking member (103) to move axially along the locking through hole (101); the rotating gear member (700) includes a spindle (730), a rotating shaft (710) and a gear (720), the head of the rotating shaft (710) is equipped with the gear (720), the spindle (730) is inserted into the rotating shaft (710), the spindle (730) and the rotating shaft (710) are coaxially arranged, the head of the spindle (730) passes through the gear (720); the head of the spindle (730) is provided with an external thread, and the head of the spindle (730) is used to pass into the gear mounting hole (102); The gear (720) can mesh with the limiting groove (331).

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