CN118383909B

CN118383909B - Artificial vertebral body

Info

Publication number: CN118383909B
Application number: CN202410858382.5A
Authority: CN
Inventors: 李健; 赵亚杰; 黄悦
Original assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Current assignee: Beijing Libeier Bio Engineering Institute Co Ltd
Priority date: 2024-06-28
Filing date: 2024-06-28
Publication date: 2024-10-01
Anticipated expiration: 2044-06-28
Also published as: CN118383909A

Abstract

The present application provides an artificial vertebral body comprising: the propping-up piece is movably penetrated in the vertebral body main body along the axial direction of the vertebral body main body; the adjusting gear is rotatably arranged on the cone body, the rotation axis of the adjusting gear is perpendicular to the axial direction of the cone body, a tooth-shaped structure extending along the axial direction of the cone body is arranged on the expanding piece, and the adjusting gear is meshed with the tooth-shaped structure so as to drive the expanding piece to move relative to the cone body; the locking structure is disposed between the vertebral body and the distractor, and has an unlocked state and a locked state, when the locking structure is in the unlocked state, the locking structure allows the distractor to move relative to the vertebral body, and when the locking structure is in the locked state, the locking structure restricts the distractor to move relative to the vertebral body to restrict the artificial vertebral body to the distracted state. According to the technical scheme provided by the application, the problem that the artificial vertebral body in the related technology is not easy to implant and fix can be solved.

Description

Artificial vertebral body

Technical Field

The invention relates to the technical field of artificial vertebral bodies, in particular to an artificial vertebral body.

Background

Vertebral body tumors, severe comminuted fractures, and certain infectious diseases (e.g., tuberculosis, etc.) often cause damage to the vertebral body, cause nerve dysfunction such as spinal cord or nerve injury, or result in collapse of the vertebral body and angulation deformity of the spinal column, the severely damaged vertebral body is resected by vertebrotomy, and an artificial vertebral body is implanted to replace the resected vertebral body.

In the related art, the artificial vertebral body can be generally divided into a bone cement filling type, a titanium mesh supporting type and a supporting and fixing type, and different types of artificial vertebral bodies have different designs, so that different types of artificial vertebral bodies have different biomechanical stability, wherein the titanium mesh supporting type artificial vertebral body has the widest application range, the cylindrical artificial vertebral body made of the titanium mesh is placed at the position of the excised vertebral body so as to support two vertebral bodies adjacent to the excised vertebral body, and the two vertebral bodies adjacent to the excised vertebral body are fixed on a steel plate by using screws.

However, the artificial vertebral body in the related art is not easily implanted and fixed.

Disclosure of Invention

The invention provides an artificial vertebral body, which aims to solve the problem that the artificial vertebral body in the related art is not easy to implant and fix.

The invention provides an artificial vertebral body, comprising: a vertebral body main body; the expansion piece is movably penetrated in the vertebral body main body along the axial direction of the vertebral body main body, the artificial vertebral body is in an expansion state and a contraction state, when the artificial vertebral body is in the expansion state, the expansion piece extends out of the vertebral body main body, and when the artificial vertebral body is in the contraction state, the expansion piece retracts into the vertebral body main body; the adjusting gear is rotatably arranged on the cone body, the rotation axis of the adjusting gear is perpendicular to the axial direction of the cone body, a tooth-shaped structure extending along the axial direction of the cone body is arranged on the expanding piece, and the adjusting gear is meshed with the tooth-shaped structure so as to drive the expanding piece to move relative to the cone body; the locking structure is arranged between the vertebral body main body and the expanding piece and is provided with an unlocking state and a locking state, when the locking structure is in the unlocking state, the locking structure allows the expanding piece to move relative to the vertebral body main body, and when the locking structure is in the locking state, the locking structure limits the expanding piece to move relative to the vertebral body main body so as to limit the artificial vertebral body to the expanding state.

Further, the locking structure comprises a self-locking buckle which is arranged on the vertebral body main body, and when the artificial vertebral body is in a propped-up state, the self-locking buckle is clamped with the propping-up piece so as to limit the propping-up piece to move relative to the vertebral body main body.

Further, the self-locking buckle includes: the first end of the elastic piece is connected with the vertebral body main body; the clamping block is arranged at the second end of the elastic piece, and is in limit fit with the vertebral body main body when the artificial vertebral body is in a propped-up state.

Further, one side of the clamping block, which faces the axis of the cone body, is provided with a driving inclined plane, the driving inclined plane is gradually close to the axis of the cone body in the extending direction of the expanding piece, and the expanding piece can be in sliding fit with the driving inclined plane.

Further, dodge the mouth of fixture block is provided with on the centrum main part, and the fixture block movably sets up in dodging mouthful department, and the first end of elastic component is connected with the lateral wall of centrum main part.

Further, the outer side wall of the vertebral body main body is provided with an accommodating groove communicated with the avoidance port, and the elastic piece is arranged in the accommodating groove.

Further, the artificial vertebral body further comprises a travel limiting structure, wherein the travel limiting structure is arranged between the vertebral body main body and the expanding piece, and when the artificial vertebral body is in an expanding state, the travel limiting structure limits the expanding piece to extend out of the length dimension of the vertebral body main body.

Further, the stroke limiting structure includes: the limiting groove extends along the axial direction of the vertebral body main body and is arranged on one of the vertebral body main body and the propping-up piece; and the limiting table is arranged on the other one of the vertebral body main body and the expanding piece, is movably arranged in the limiting groove along the extending direction of the limiting groove, and moves to one end of the limiting groove and is abutted against the end wall of the limiting groove when the artificial vertebral body is in an expanding state.

Further, a guide hole extending along the axial direction of the vertebral body is formed in the vertebral body main body, and the expanding piece movably penetrates through the guide hole along the extending direction of the guide hole.

Further, the outer side wall of the vertebral body main body is provided with a bone trabecula structure; and/or the hole wall of the guide hole is a smooth solid structure.

Further, the propping-up piece comprises an upper propping-up piece and a lower propping-up piece which are arranged in parallel, the upper propping-up piece and the lower propping-up piece are respectively positioned at two sides of the rotation axis of the adjusting gear, tooth-shaped structures are arranged on the upper propping-up piece and the lower propping-up piece, the upper propping-up piece and the lower propping-up piece are movably penetrated in the vertebral body along the axial direction of the vertebral body, when the artificial vertebral body is in a propping-up state, the upper propping-up piece extends upwards out of the vertebral body, the lower propping-up piece extends downwards out of the vertebral body, and when the artificial vertebral body is in a shrinking state, the upper propping-up piece and the lower propping-up piece retract into the vertebral body; and/or the front end of the expanding piece in the extending direction is provided with a pointed cone structure.

Further, the cross section of the cone body is a non-circular cross section; and/or an operation port is arranged on the cone body, the operation port is coaxially arranged with the rotation axis of the adjusting gear, and the adjusting gear is provided with an operation part positioned in the operation port.

By applying the technical scheme of the invention, the artificial vertebral body comprises a vertebral body main body, a spreading member, an adjusting gear and a locking structure, the artificial vertebral body in a contracted state is placed at the position of the excised vertebral body, the locking structure is switched to an unlocking state, the adjusting gear is meshed with the toothed structure through rotation, the adjusting gear drives the spreading member to move relative to the vertebral body main body along the axial direction of the vertebral body main body through the toothed structure, the spreading member stretches out of the vertebral body main body, the artificial vertebral body is switched from the contracted state to the spreading state so as to support two vertebral bodies adjacent to the excised vertebral body, then the locking structure is switched to the locking state so as to limit the spreading member to move relative to the vertebral body main body, the artificial vertebral body is limited to the spreading state, and the backward displacement of the spreading member is prevented.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 illustrates a schematic structural view of an artificial vertebral body in a contracted state provided in accordance with an embodiment of the present invention;

FIG. 2 shows a cross-sectional view at A-A in FIG. 1;

FIG. 3 illustrates a schematic view of an artificial vertebral body in an distracted state, provided in accordance with an embodiment of the present invention;

FIG. 4 shows a cross-sectional view at B-B in FIG. 3;

FIG. 5 shows a partial enlarged view at C in FIG. 4;

FIG. 6 illustrates a schematic structural view of another view of an artificial vertebral body in a contracted state provided in accordance with an embodiment of the present invention;

FIG. 7 illustrates a schematic structural view of another view of an artificial vertebral body in an distracted state, provided in accordance with an embodiment of the present invention;

Fig. 8 shows a schematic structural view of an artificial vertebral body provided according to an embodiment of the present invention.

Wherein the above figures include the following reference numerals:

10. a vertebral body main body; 11. an avoidance port; 12. a receiving groove; 13. a guide hole; 14. an operation port;

20. a spreader; 21. a tooth-shaped structure; 22. an upper support member; 23. a lower support member; 24. a pointed cone structure;

30. An adjusting gear;

40. a locking structure; 41. self-locking buckle; 411. an elastic member; 412. a clamping block; 4121. a driving inclined plane;

50. a travel limit structure; 51. a limit groove; 52. a limiting table;

60. the tool is rotated.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 8, the embodiment of the present invention provides an artificial vertebral body, the artificial vertebral body includes a vertebral body main body 10, a spreader 20, an adjusting gear 30 and a locking structure 40, the spreader 20 is movably disposed on the vertebral body main body 10 along an axial direction of the vertebral body main body 10, the artificial vertebral body has a spread state and a contracted state, when the artificial vertebral body is in the spread state, the spreader 20 extends out of the vertebral body main body 10, when the artificial vertebral body is in the contracted state, the spreader 20 is retracted into the vertebral body main body 10, the adjusting gear 30 is rotatably disposed on the vertebral body main body 10, a rotation axis of the adjusting gear 30 is perpendicular to the axial direction of the vertebral body main body 10, a tooth-shaped structure 21 extending along the axial direction of the vertebral body main body 10 is disposed on the spreader 20, the adjusting gear 30 is engaged with the tooth-shaped structure 21 to drive the spreader 20 to move relative to the vertebral body main body 10, the locking structure 40 is disposed between the vertebral body main body 10 and the spreader 20, the locking structure 40 has an unlocked state and a locked state when the locking structure 40 is in the contracted state, the locking structure 40 allows the spreader 20 to move relative to the vertebral body main body 10 when the locking structure 40 is in the unlocked state.

By applying the artificial vertebral body provided by the embodiment, the artificial vertebral body comprises the vertebral body main body 10, the expanding member 20, the adjusting gear 30 and the locking structure 40, the artificial vertebral body in the contracted state is placed at the position of the excised vertebral body, the locking structure 40 is switched to the unlocking state, the adjusting gear 30 is rotated, the adjusting gear 30 drives the expanding member 20 to move relative to the vertebral body main body 10 along the axial direction of the vertebral body main body 10 through the tooth-shaped structure 21 due to the meshing of the adjusting gear 30 and the tooth-shaped structure 21, the expanding member 20 extends out of the vertebral body main body 10, the artificial vertebral body is switched from the contracted state to the expanded state so as to support two vertebral bodies adjacent to the excised vertebral body, and then the locking structure 40 is switched to the locking state so as to limit the expanding member 20 to move relative to the vertebral body main body 10, the artificial vertebral body is limited to the expanded state, the expanding member 20 is prevented from being moved backwards, and the easy operation of implantation and fixation of the artificial vertebral body can be improved by adopting the artificial vertebral body.

When the artificial vertebral body is in the contracted state, the spreader 20 is retracted into the vertebral body main body 10, so that the size of the artificial vertebral body is reduced, and the artificial vertebral body can be conveniently placed at the position of the excised vertebral body.

In this embodiment, the teeth of the tooth form structure 21 and the adjusting gear 30 are both trapezoidal in shape, so as to improve the strength and the service life of the tooth form structure 21 and the adjusting gear 30.

Specifically, the vertebral body 10 is made of medical metal (including but not limited to titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metal, magnesium alloys, all of which are specified in international standards of ISO-5830 series, and the biocompatibility of the vertebral body is verified by practice of orthopedic implant applications for many years at home and abroad).

As shown in fig. 4, the locking structure 40 includes a self-locking buckle 41, where the self-locking buckle 41 is disposed on the vertebral body main body 10, and when the artificial vertebral body is in the distracted state, the self-locking buckle 41 is clamped with the distracting member 20 to limit the movement of the distracting member 20 relative to the vertebral body main body 10. With the self-locking buckle 41, after the artificial vertebral body is switched from the contracted state to the expanded state, the self-locking buckle 41 is clamped with the expanding piece 20, so that the locking structure 40 is simple in structure and easy to operate and process.

As shown in fig. 4 and 5, the self-locking buckle 41 includes an elastic member 411 and a clamping block 412, wherein a first end of the elastic member 411 is connected with the vertebral body main body 10, the clamping block 412 is disposed at a second end of the elastic member 411, and when the artificial vertebral body is in a distracted state, the clamping block 412 is in limit fit with the vertebral body main body 10. In the process of switching the artificial vertebral body from the contracted state to the expanded state, the expanding member 20 is matched with the clamping block 412, so that the elastic member 411 is elastically deformed, the clamping block 412 avoids the moving path of the expanding member 20, after the artificial vertebral body is switched from the contracted state to the expanded state, the clamping block 412 is positioned at the rear side of the expanding member 20 in the expanding direction of the expanding member 20 relative to the vertebral body main body 10, the expanding member 20 is separated from the clamping block 412, the elastic member 411 enables the clamping block 412 to reset, and the clamping block 412 is positioned on the moving path of the expanding member 20, so that the clamping block 412 is in limit fit with the expanding member 20, and the expanding member 20 is prevented from retreating relative to the vertebral body main body 10.

As shown in fig. 4 and 5, a side of the latch block 412 facing the axis of the vertebral body 10 is provided with a driving ramp 4121, the driving ramp 4121 is gradually inclined toward the axis of the vertebral body 10 in the extending direction of the spreader 20, and the spreader 20 can be slidably engaged with the driving ramp 4121. In the process that the artificial vertebral body is switched from the contracted state to the expanded state, the expanding piece 20 is firstly contacted with one end, away from the axis of the vertebral body main body 10, of the driving inclined plane 4121 in the process that the expanding piece 20 is stretched out, the expanding piece 20 is gradually contacted with one end, close to the axis of the vertebral body main body 10, of the driving inclined plane 4121, the expanding piece 20 enables the clamping block 412 to move towards the direction away from the axis of the vertebral body main body 10 through the driving inclined plane 4121, the clamping block 412 avoids the moving path of the expanding piece 20, and the clamping block 412 can automatically avoid the moving path of the expanding piece 20 in the stretching out process of the expanding piece 20 without user operation, so that the operation steps are simplified.

In the present embodiment, the elastic member 411 and the latch 412 are integrally formed with the vertebral body main body 10 by additive manufacturing.

As shown in fig. 4 and 5, the vertebral body main body 10 is provided with an avoidance port 11 for avoiding a clamping block 412, the clamping block 412 is movably arranged at the avoidance port 11, and a first end of the elastic member 411 is connected with an outer side wall of the vertebral body main body 10. Because the first end of the elastic member 411 is connected to the outer sidewall of the vertebral body main body 10, and in the process that the spreader 20 extends out relative to the vertebral body main body 10, the clamping block 412 moves into the avoiding opening 11, so that the vertebral body main body 10 has a compact structure.

As shown in fig. 4 and 5, the outer sidewall of the vertebral body main body 10 is provided with a receiving groove 12 communicating with the escape port 11, and the elastic member 411 is disposed in the receiving groove 12. The elastic piece 411 is accommodated by the accommodating groove 12, so that the elastic piece 411 can be prevented from protruding out of the outer side wall of the vertebral body main body 10, the protruding structure of the artificial vertebral body is reduced, the stimulation of the artificial vertebral body to soft tissues is reduced, and the later recovery is facilitated.

As shown in fig. 2, the artificial vertebral body further includes a travel limiting structure 50, the travel limiting structure 50 is disposed between the vertebral body main body 10 and the distracting member 20, when the artificial vertebral body is in the distracting state, the travel limiting structure 50 limits the length dimension of the distracting member 20 extending from the vertebral body main body 10, and when the artificial vertebral body is switched from the contracted state to the distracting state, the travel limiting structure 50 limits the length dimension of the distracting member 20 extending from the vertebral body main body 10, so that when the artificial vertebral body is in the distracting state, a user can obtain in-place perception from the adjusting gear 30, and is convenient for the user to confirm whether the artificial vertebral body is adjusted to the distracting state.

As shown in fig. 2, the travel limiting structure 50 includes a limiting groove 51 and a limiting table 52, the limiting groove 51 extends along the axial direction of the vertebral body main body 10, the limiting groove 51 is provided on one of the vertebral body main body 10 and the distractor 20, the limiting table 52 is provided on the other of the vertebral body main body 10 and the distractor 20, the limiting table 52 is movably provided in the limiting groove 51 along the extending direction of the limiting groove 51, and when the artificial vertebral body is in the distracted state, the limiting table 52 moves to one end of the limiting groove 51 and abuts against the end wall of the limiting groove 51. The travel limit structure 50 adopting the structure has the advantages of simple structure and easy processing.

Specifically, the limiting table 52 is located at the rear end of the spreader 20 in the extending direction, when the artificial vertebral body is switched from the contracted state to the extended state, during the process that the spreader 20 extends outwards relative to the vertebral body main body 10, the spreader 20 is firstly contacted with one end of the driving inclined plane 4121, which is far away from the axis of the vertebral body main body 10, during the process that the spreader 20 extends, the spreader 20 is gradually contacted with one end of the driving inclined plane 4121, which is close to the axis of the vertebral body main body 10, the spreader 20 moves the clamping block 412 in a direction far away from the axis of the vertebral body main body 10 through the driving inclined plane 4121, then the limiting table 52 is contacted with one end of the driving inclined plane 4121, which is far away from the axis of the vertebral body main body 10, the spreader 20 continues to extend until the limiting table 52 passes through the clamping block 412, the clamping block 412 is located at the rear side of the limiting table 52 in the extending direction of the spreader 20 relative to the vertebral body main body 10, both the spreader 20 and the limiting table 52 are separated from the clamping block 412, the elastic member 411 enables the clamping block 412 to reset, and the clamping block 412 is located on the moving path of the spreader 20, which is close to the clamping block 412, so that the clamping block 412 is matched with the spreader 20, and the vertebral body 20 is prevented from being retracted relative to the vertebral body main body 10.

As shown in fig. 2, 3 and 8, the vertebral body main body 10 is provided with a guide hole 13 extending in the axial direction of the vertebral body main body 10, and the spreader 20 is movably inserted into the guide hole 13 in the extending direction of the guide hole 13, and the movement of the spreader 20 relative to the vertebral body main body 10 is guided by the guide hole 13.

Specifically, the limiting groove 51 is provided on the wall of the guide hole 13, and the escape opening 11 is provided on the wall of the limiting groove 51 facing the axis of the vertebral body 10.

In this embodiment, the outer side wall of the vertebral body main body 10 is provided with a bone trabecular structure, and the hole wall of the guide hole 13 is a plain solid structure. Through set up bone trabecula structure on the lateral wall of centrum main part 10, can improve the initial stability and the long-term fixed stability of centrum main part 10, and in the later stage regeneration bone structure grew into bone trabecula structure, can solve bone grafting bone quantity inadequately and have the effect that promotes osseous fusion, because the pore wall of guiding hole 13 is plain noodles entity structure, make the inboard of centrum main part 10 be entity structure, improve the structural strength of centrum main part 10, prevent artifical centrum subsidence, and when propping up the piece 20 and remove in guiding hole 13, avoid both friction to produce the piece damage.

As shown in fig. 2 to 4, the spreader 20 includes an upper spreader 22 and a lower spreader 23 disposed in parallel, the upper spreader 22 and the lower spreader 23 are respectively located at two sides of the rotation axis of the adjusting gear 30, tooth-shaped structures 21 are respectively disposed on the upper spreader 22 and the lower spreader 23, the upper spreader 22 and the lower spreader 23 are movably disposed on the vertebral body 10 along the axial direction of the vertebral body 10, when the artificial vertebral body is in the spread state, the upper spreader 22 extends upward from the vertebral body 10, the lower spreader 23 extends downward from the vertebral body 10, and when the artificial vertebral body is in the contracted state, the upper spreader 22 and the lower spreader 23 retract into the vertebral body 10. By adopting the upper supporting piece 22 and the lower supporting piece 23, the artificial vertebral body in the contracted state is placed at the position of the resected vertebral body, the locking structure 40 is switched to the unlocking state, the adjusting gear 30 is rotated, the adjusting gear 30 drives the upper supporting piece 22 and the lower supporting piece 23 to reversely move relative to the vertebral body main body 10 along the axial direction of the vertebral body main body 10 through the tooth-shaped structure 21, the upper supporting piece 22 extends upwards from the vertebral body main body 10, the lower supporting piece 23 extends downwards from the vertebral body main body 10, the artificial vertebral body is switched to the supporting state from the contracted state, the upper supporting piece 22 and the lower supporting piece 23 are used for supporting two vertebral bodies adjacent to the resected vertebral body, and the two vertebral bodies adjacent to the resected vertebral body are respectively supported by the upper supporting piece 22 and the lower supporting piece 23, so that the supporting force is more stable.

In this embodiment, the sum of the dimension of the upper strut 22 extending upwardly from the vertebral body 10 and the dimension of the lower strut 23 extending downwardly from the vertebral body 10 is between 5mm and 50mm when the artificial vertebral body is in the distracted state.

In this embodiment, the adjusting gear 30 is a six-tooth gear, the central angle between two adjacent teeth is 60 degrees, and each adjusting gear 30 rotates to engage one tooth (i.e., rotates the central angle between two adjacent teeth, which is 60 degrees in this embodiment), and the upper support 22 and the lower support 23 move 1mm relative to the vertebral body 10 along the axial direction of the vertebral body 10.

In this embodiment, the diameter of the upper strut 22 and the diameter of the lower strut 23 are both 2.5mm.

As shown in fig. 4, the front end of the expansion member 20 in the extending direction is provided with a pointed cone structure 24, and when the artificial vertebral body is expanded, the adjacent segment vertebral body is pricked by the pointed cone structure 24, so that the adjacent vertebral body and the artificial vertebral body are prevented from shifting and sliding, and the initial stability of the implantation position of the artificial vertebral body is improved.

As shown in fig. 8, the cross section of the vertebral body main body 10 is a non-circular cross section, and during the implantation process of the artificial vertebral body, the artificial vertebral body is clamped by the special holder, so as to place the artificial vertebral body at the position of the excised vertebral body, avoid the deflection of the artificial vertebral body around the vertical axis thereof, and after the artificial vertebral body is switched from the contracted state to the expanded state and the locking structure 40 is switched to the locked state, the artificial vertebral body is loosened by the special holder, and the special holder is taken out.

As shown in fig. 2 and 4, the cone body 10 is provided with an operation port 14, the operation port 14 is coaxially arranged with the rotation axis of the adjusting gear 30, the adjusting gear 30 has an operation portion located in the operation port 14, and a rotation tool 60 (adjusting screwdriver) is conveniently inserted into the operation port 14 to apply torque to the operation portion so as to rotate the adjusting gear 30.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An artificial vertebral body, the artificial vertebral body comprising:

A vertebral body main body (10);

The expansion piece (20) is movably arranged on the vertebral body main body (10) in a penetrating manner along the axial direction of the vertebral body main body (10), the artificial vertebral body is in an expanded state and a contracted state, the expansion piece (20) stretches out of the vertebral body main body (10) when the artificial vertebral body is in the expanded state, and the expansion piece (20) is retracted into the vertebral body main body (10) when the artificial vertebral body is in the contracted state;

An adjusting gear (30) rotatably arranged on the cone body (10), wherein the rotation axis of the adjusting gear (30) is perpendicular to the axial direction of the cone body (10), a tooth-shaped structure (21) extending along the axial direction of the cone body (10) is arranged on the expanding piece (20), and the adjusting gear (30) is meshed with the tooth-shaped structure (21) so as to drive the expanding piece (20) to move relative to the cone body (10);

A locking structure (40) disposed between the vertebral body (10) and the distractor (20), the locking structure (40) having an unlocked state and a locked state, the locking structure (40) allowing movement of the distractor (20) relative to the vertebral body (10) when the locking structure (40) is in the unlocked state, the locking structure (40) limiting movement of the distractor (20) relative to the vertebral body (10) when the locking structure (40) is in the locked state to limit the artificial vertebral body to the distracted state;

The locking structure (40) comprises a self-locking buckle (41), the self-locking buckle (41) is arranged on the cone body (10), and the self-locking buckle (41) comprises: an elastic member (411), a first end of the elastic member (411) being connected to the vertebral body main body (10); the clamping block (412) is arranged at the second end of the elastic piece (411), wherein in the process of switching the artificial vertebral body from the contracted state to the expanded state, the expanding piece (20) is matched with the clamping block (412) so that the elastic piece (411) is elastically deformed, the clamping block (412) avoids a moving path of the expanding piece (20), and after the artificial vertebral body is switched from the contracted state to the expanded state, the clamping block (412) is in limit fit with the expanding piece (20) so as to prevent the expanding piece (20) from retreating relative to the vertebral body main body (10);

The artificial vertebral body further comprises a travel limiting structure (50), and the travel limiting structure (50) comprises: a limit groove (51) extending along the axial direction of the cone body (10), wherein the limit groove (51) is arranged on one of the cone body (10) and the spreader (20); and the limiting table (52) is arranged on the other one of the vertebral body main body (10) and the expanding piece (20), the limiting table (52) is movably arranged in the limiting groove (51) along the extending direction of the limiting groove (51), and when the artificial vertebral body is in the expanding state, the limiting table (52) moves to one end of the limiting groove (51) and is abutted with the end wall of the limiting groove (51).

2. The artificial vertebral body according to claim 1, characterized in that a side of the clamping block (412) facing the axis of the vertebral body main body (10) is provided with a driving bevel (4121), the driving bevel (4121) being inclined gradually closer to the axis of the vertebral body main body (10) in the protruding direction of the spreader (20), the spreader (20) being capable of sliding fit with the driving bevel (4121).

3. The artificial vertebral body according to claim 1, characterized in that an avoidance opening (11) for avoiding the clamping block (412) is provided on the vertebral body (10), the clamping block (412) is movably provided at the avoidance opening (11), and the first end of the elastic member (411) is connected with the outer side wall of the vertebral body (10).

4. An artificial vertebral body according to claim 3, wherein the outer side wall of the vertebral body main body (10) is provided with a receiving groove (12) communicated with the avoiding opening (11), and the elastic member (411) is arranged in the receiving groove (12).

5. Artificial vertebral body according to any of claims 1-4, characterized in that the vertebral body (10) is provided with a guiding hole (13) extending in the axial direction of the vertebral body (10), the spreader (20) being movably arranged through the guiding hole (13) in the direction of extension of the guiding hole (13).

6. The artificial vertebral body of claim 5 wherein the artificial vertebral body comprises,

The outer side wall of the vertebral body main body (10) is provided with a bone trabecula structure; and/or the number of the groups of groups,

The hole wall of the guide hole (13) is of a smooth solid structure.

7. The artificial vertebral body of any one of claims 1-4 wherein,

The upper support (22) and the lower support (23) are arranged in parallel, the upper support (22) and the lower support (23) are respectively positioned at two sides of the rotation axis of the adjusting gear (30), the tooth-shaped structures (21) are respectively arranged on the upper support (22) and the lower support (23), the upper support (22) and the lower support (23) are respectively movably penetrated in the vertebral body main body (10) along the axial direction of the vertebral body main body (10), when the artificial vertebral body is in the open state, the upper support (22) is upwards extended out of the vertebral body main body (10), the lower support (23) is downwards extended out of the vertebral body main body (10), and when the artificial vertebral body is in the contracted state, the upper support (22) and the lower support (23) are respectively retracted into the vertebral body main body (10); and/or the number of the groups of groups,

The front end of the spreader (20) in the extending direction thereof is provided with a pointed cone structure (24).

8. The artificial vertebral body of any one of claims 1-4 wherein,

The cross section of the cone body (10) is a non-circular cross section; and/or the number of the groups of groups,

An operation port (14) is formed in the cone body (10), the operation port (14) is coaxially arranged with the rotation axis of the adjusting gear (30), and the adjusting gear (30) is provided with an operation part located in the operation port (14).