CN216021552U - Height-adjustable's interbody fusion cage - Google Patents

Abstract

The utility model discloses a height-adjustable intervertebral fusion cage, which comprises: the bone grafting device comprises a connecting block, a bone grafting bin, an outer side face and an inner side face, wherein the outer side face and the inner side face are opposite and are respectively provided with a through hole communicated with the bone grafting bin; and the lifting assembly is arranged between the two connecting blocks and is provided with a first connecting end connected with the inner side surface of one connecting block and a second connecting end connected with the inner side surface of the other connecting block, and the first connecting end and the second connecting end can be mutually close to or far away from each other. The height of the interbody fusion cage is adjusted by the mutual approaching or separating of the first connecting end and the second connecting end, so that the two connecting blocks are respectively connected with the upper vertebral body and the lower vertebral body, and the occlusion connection between the connecting blocks and the vertebral bodies is enhanced by the tooth parts on the connecting blocks; the connecting block is equipped with the bone grafting storehouse and with the communicating through-hole in bone grafting storehouse, packs broken bone toward bone grafting storehouse, promotes the interbody fusion of postoperative patient for patient's postoperative healing resumes speed.

Description

Height-adjustable's interbody fusion cage

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an intervertebral fusion cage with adjustable height.

Background

When treating lumbar intervertebral disc protrusion, reduction, decompression, fusion and internal fixation to restore the continuity of the lumbar three-dimensional structure and normal physiological curvature become the currently accepted principle for treating lumbar spondylolisthesis. To realize reduction and decompression, the height specification and the external dimension of the implanted fusion device are fit with the normal physiological structure of the spine of a patient. With the rapid development of science and technology, products of the interbody cage are diversified, including an interbody cage having a height adjustment function.

However, in clinical application, it is found that although the interbody fusion cage has a height-adjustable function and strong versatility, and can be applied to different patients, the height of the interbody fusion cage is adjusted to make the interbody fusion cage fit with the physiological structure of the spine, but the problem of slow healing and recovery speed after operation generally exists in patients implanted with such interbody fusion cages.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a height adjustable intervertebral cage that solves one or more of the problems set forth in the prior art and provides at least one useful alternative or creation.

The technical scheme adopted for solving the technical problems is as follows:

the present invention provides a height-adjustable intervertebral cage, comprising:

the connecting block is provided with a bone grafting bin, an outer side surface and an inner side surface, the outer side surface and the inner side surface are opposite, the outer side surface and the inner side surface are both provided with through holes communicated with the bone grafting bin, the outer side surface is provided with a tooth part, and the tooth part is positioned at the edge of the outer side surface; the two connecting blocks are arranged, and the inner side surfaces of the two connecting blocks are oppositely arranged;

the lifting assembly is arranged between the two connecting blocks and is provided with a first connecting end and a second connecting end, the first connecting end is connected with the inner side face of one connecting block, the second connecting end is connected with the inner side face of the other connecting block, and the first connecting end and the second connecting end can be mutually close to or far away from each other.

The utility model has at least the following beneficial effects: a lifting component is arranged between the two connecting blocks, the height of the interbody fusion cage is adjusted by the mutual approaching or separating of the first connecting end and the second connecting end, the two connecting blocks can be respectively connected with the upper vertebral body and the lower vertebral body and provide a supporting function, and the occlusion connection between the connecting blocks and the vertebral bodies can be enhanced through the tooth parts on the connecting blocks; and, the connecting block is equipped with the bone grafting storehouse and with the communicating through-hole in bone grafting storehouse, conveniently carries out the broken bone to fill in the bone grafting storehouse, promotes the interbody fusion of postoperative patient for patient's postoperative healing resumes speed.

As a further improvement of the above technical solution, the connecting block includes a housing and a cover plate; the casing is equipped with the opening towards the recess of apron, the apron with the casing can be dismantled and be connected, apron and recess form jointly the bone grafting storehouse, the apron is equipped with tooth portion. The casing sets up the recess, conveniently fills the bone fragment toward the recess to can dismantle the apron and connect in the casing, deposit the bone fragment in planting the bone storehouse, reduce the bone grafting work degree of difficulty.

As a further improvement of the technical scheme, the shell is provided with a screw hole which can be connected with a bolt, and the cover plate is provided with a mounting hole corresponding to the screw hole. And the shell and the cover plate are tightly connected by adopting a bolt connection mode.

As a further improvement of the technical scheme, the shell is provided with an annular positioning step, the annular positioning step is arranged along the edge of the shell, and the cover plate is connected with the annular positioning step in an adaptive mode. The shell is provided with an annular positioning step, the cover plate is arranged on the annular positioning step, positioning work before installation is completed, and centering of the screw hole and the installation hole is achieved.

As a further improvement of the above technical solution, a surface of the housing adjacent to the outer side surface is provided with the through hole. The outer side surface and the inner side surface of the shell are provided with the through holes, and the surface of the shell adjacent to the outer side surface is provided with the through holes, so that the shell is in a porous structure, a space environment can be provided for the growth of bone tissues, the transportation of nutrient substances and metabolic substances is promoted, the adhesion, proliferation and differentiation of bone-related cells are induced, and the broken bones and the vertebral bodies are promoted to be effectively fused.

As a further improvement of the above technical solution, the lifting assembly includes:

the first moving seat is provided with a clamping hole and two first connecting rods, one end of one first connecting rod is hinged to the first moving seat, the other end of the one first connecting rod is hinged to one connecting block, one end of the other first connecting rod is hinged to the first moving seat, and the other end of the other first connecting rod is hinged to the other connecting block;

the second moving seat is arranged opposite to the first moving seat, and extends towards the first moving seat to form a connecting part; the second movable seat is provided with two second connecting rods, one end of one second connecting rod is hinged to the second movable seat, the other end of the second connecting rod is hinged to one connecting block, one end of the other second connecting rod is hinged to the second movable seat, and the other end of the other second connecting rod is hinged to the other connecting block;

the adjusting rod is arranged in the clamping hole and can rotate along the axis of the adjusting rod, one of the adjusting rod and the connecting part is provided with an internal thread, and the other of the adjusting rod and the connecting part is provided with an external thread connected with the internal thread.

Two first connecting rods are arranged on the first moving seat, two second connecting rods are arranged on the second moving seat, and the two first connecting rods and the two second connecting rods are respectively hinged with the two connecting blocks correspondingly to enable the two first connecting rods and the two second connecting rods to form a deformable parallelogram structure; and, adjust the pole and establish in the card hole of first removal seat, and can follow the relative first removal seat rotation of axis of self, the second removes the seat and is equipped with connecting portion, adjusts pole and connecting portion threaded connection, when rotating the regulation pole, can make the regulation pole precession connecting portion to shorten the distance between first removal seat and the second removal seat, and then order about parallelogram structure deformation, lead to two connecting blocks to keep away from each other, realize this interbody fusion cage's height-adjustable festival.

As a further improvement of the above technical solution, the length of the first link is identical to that of the second link. The length of the first connecting rod is equal to that of the second connecting rod, so that the two first connecting rods and the two second connecting rods jointly form a rhombic structure, and when the first movable seat and the second movable seat are close to or far away from each other, the two connecting blocks can linearly move along the height direction of the interbody fusion cage, so that the interbody fusion cage is implanted into an injured vertebra and then the height of the interbody fusion cage is adjusted, and the position of the interbody fusion cage does not need to be adjusted to ensure that the connecting blocks are in full contact with the vertebra.

As a further improvement of the technical scheme, an inner corner hole is formed in one end, far away from the connecting part, of the adjusting rod. Adjust the pole and set up the interior angle hole, conveniently use interior angle spanner to adjust the pole operation, will adjust the pole and twist into connecting portion, reduce the degree of difficulty of intraoperative adjustment interbody fusion cage height.

As a further improvement of the above technical solution, the intervertebral fusion cage further comprises a fixing member; the fixing piece is provided with a third connecting end and a fourth connecting end which can be connected with a vertebral body, and the third connecting end is connected with the first movable seat. The third link through the mounting is connected with first removal seat, makes first removal seat fixed relatively the mounting, and unable removal is connected with the centrum through the fourth link of mounting, makes the relative centrum of mounting fixed to avoid postoperative interbody fusion cage to take place the problem appearance of subsidence, displacement.

As a further improvement of the above technical solution, the first movable seat is provided with a connection screw hole; the fixing member includes:

a connection plate provided with a first connection hole and a second connection hole;

the connecting bolt is provided with a first external thread part which can penetrate through the first connecting hole and is connected with the connecting screw hole;

and the spinal screw is provided with a second external thread part which can pass through the second connecting hole and is connected with the vertebral body.

The connecting plate is provided with a first connecting hole and is connected with a connecting screw hole of the first movable seat through a connecting bolt which penetrates through the first connecting hole, so that the connecting plate and the first movable seat can be detachably connected; and the spine screw passes through the second connecting hole to be connected with the vertebral body, so that the connecting plate is fixed on the vertebral body, and the intervertebral fusion device is effectively prevented from moving relative to the vertebral body.

Drawings

The utility model is further described with reference to the accompanying drawings and examples;

FIG. 1 is a perspective view of an embodiment of a height adjustable intervertebral cage according to the present invention;

FIG. 2 is a right side view of the height adjustable intervertebral cage of the present invention;

FIG. 3 is a perspective view of the housing provided by the present invention;

FIG. 4 is a perspective view of the cover plate according to the present invention;

fig. 5 is a perspective view of another embodiment of the height adjustable intervertebral cage of the present invention.

The drawings are numbered as follows: 100. connecting blocks; 110. an outer side surface; 120. an inner side surface; 130. a bone grafting bin; 140. a through hole; 150. a tooth portion; 160. a housing; 161. a groove; 170. a cover plate; 171. mounting holes; 180. an annular positioning step; 200. a lifting assembly; 210. a first movable base; 211. a connecting screw hole; 220. a second movable base; 221. a connecting portion; 230. adjusting a rod; 231. an inner corner hole; 240. a first link; 250. a second link; 300. a fixing member; 310. a connecting plate; 320. a connecting bolt; 330. spinal screws.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if words such as "a plurality" are described, it means one or more, a plurality is two or more, more than, less than, more than, etc. are understood as not including the present number, and more than, less than, etc. are understood as including the present number. If any description to first, second and third is only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

It should be noted that the X direction in the drawings is from the back side to the front side of the height-adjustable intervertebral cage; the Y direction is from the left side to the right side of the height-adjustable intervertebral fusion device; the Z direction is directed from the underside to the upside of the height adjustable intersomatic cage.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 to 5, several embodiments of the height adjustable intervertebral cage of the present invention will be described.

As shown in fig. 1 to 4, an embodiment of the present invention provides a height-adjustable intervertebral cage including: a connecting block 100 and a lifting assembly 200.

The connecting block 100 is provided with a bone grafting bin 130, a lateral surface 110 and a medial surface 120, the lateral surface 110 and the medial surface 120 are opposite, the lateral surface 110 and the medial surface 120 are both provided with through holes 140 communicated with the bone grafting bin 130, and the through holes 140 can be round holes, triangular holes or other holes. In the present embodiment, the outer side surface 110 and the inner side surface 120 are disposed along the vertical direction, the through holes 140 on the outer side surface 110 are mesh holes, and the through holes 140 on the inner side surface 120 are circular holes.

Adopt above-mentioned structure, connecting block 100 presents porous structure, makes things convenient for the interior broken bone that packs of clinician toward bone grafting storehouse 130, promotes the interbody fusion of postoperative patient for patient's postoperative healing resumes speed.

The outer side surface 110 is provided with a tooth part 150, the tooth part 150 is integrally formed with the connecting block 100, and the tooth part 150 is located at the edge of the outer side surface 110. When the connecting block 100 is in contact with the vertebral body, the tooth part 150 is occluded with the vertebral body bone, so that the connection between the connecting block 100 and the vertebral body can be enhanced, and the connecting block 100 is prevented from being displaced relative to the vertebral body.

Specifically, the connection block 100 includes a housing 160 and a cover plate 170. The housing 160 is provided with a groove 161 with an opening facing the cover plate 170, and the cover plate 170 is detachably connected with the housing 160, wherein the connection mode includes a bolt connection mode, a snap connection mode and the like. The cover plate 170 and the groove 161 together form the bone grafting bin 130, the edge of the cover plate 170 is provided with the tooth part 150, and the tooth part 150 is arranged around the through hole 140.

Casing 160 sets up recess 161, makes things convenient for the clinician to pack the bone fragment toward recess 161 intussuseption to can dismantle apron 170 and connect in casing 160, deposit the bone fragment in bone grafting storehouse 130, reduce the bone grafting work degree of difficulty.

The cover plate 170 may be made of Polyetheretherketone (PEEK) material, which is the material most closely approaching the elastic modulus of human bone in clinical use at present. The housing 160 may be made of a titanium alloy material having a high elastic modulus and a good toughness.

In this embodiment, the housing 160 is provided with screw holes capable of being connected with bolts, the cover plate 170 is provided with mounting holes 171 corresponding to the screw holes, two screw holes and two mounting holes 171 are provided, and the two mounting holes 171 are respectively located at the front end and the rear end of the cover plate 170. It should be noted that the number of the screw holes and the mounting holes 171 can be selected according to actual requirements. The shell 160 and the cover plate 170 are detachably and tightly connected by bolts.

In this embodiment, the housing 160 is provided with an annular positioning step 180, the annular positioning step 180 is arranged along the edge of the housing 160, the housing 160 is recessed towards the groove 161 along the edge of the groove 161 so as to form the annular positioning step 180, and the cover plate 170 is fittingly connected to the annular positioning step 180, where fittingly connecting means that the cover plate 170 can be fitted on the housing 160. The cover plate 170 is placed on the annular positioning step 180, so that the positioning work before the installation of the cover plate 170 is completed, and the centering of the screw hole and the installation hole 171 is realized.

The cover plate 170 may be a rectangular plate, a circular plate, or a plate of other shape.

Further, the surface of the housing 160 adjacent to the outer side 110 is provided with the through hole 140. In the present embodiment, the left and right sides of the case 160 are each provided with a through-hole 140 having a polygonal shape. Since the screw holes are provided at the front and rear ends of the case 160, the front and rear sides of the case 160 may not be provided with the through holes 140.

Not only the outer side 110 and the inner side 120 of the shell 160 are provided with the through holes 140, but also the surface of the shell 160 adjacent to the outer side 110 is provided with the through holes 140, so that the shell 160 presents a porous structure, a space environment can be provided for the growth of bone tissues, the transportation of nutrients and metabolites is promoted, the adhesion, proliferation and differentiation of bone-related cells are induced, and the effective fusion of broken bones and vertebral bodies is promoted.

The number of the connecting blocks 100 is two, and the inner side surfaces 120 of the two connecting blocks 100 are oppositely arranged. In this embodiment, two connecting blocks 100 are disposed up and down.

The lifting assembly 200 is arranged between the two connecting blocks 100, the lifting assembly 200 is provided with a first connecting end and a second connecting end, the first connecting end is connected with the inner side surface 120 of one connecting block 100, the second connecting end is connected with the inner side surface 120 of the other connecting block 100, and the first connecting end and the second connecting end can be mutually close to or far away from each other.

The lifting assembly 200 is arranged between the two connecting blocks 100, and the height of the intervertebral fusion device is adjusted by the mutual approaching or separating of the first connecting end and the second connecting end, so that the two connecting blocks 100 can be respectively connected with the upper vertebral body and the lower vertebral body and provide a supporting function, and the universality of the intervertebral fusion device is improved.

Specifically, the lifting assembly 200 includes a first movable base 210, a second movable base 220 and an adjusting rod 230.

The first moving base 210 is provided with a clamping hole and two first connecting rods 240, one end of one of the first connecting rods 240 is hinged to the first moving base 210 through a pin shaft, the other end of one of the first connecting rods 240 is hinged to one of the connecting blocks 100 through a pin shaft, one end of the other first connecting rod 240 is hinged to the first moving base 210 through a pin shaft, and the other end of the other first connecting rod 240 is hinged to the other connecting block 100 through a pin shaft. The first movable base 210 is connected to the two connection blocks 100 through two first connection rods 240.

The second movable base 220 is disposed opposite to the first movable base 210, and in this embodiment, the second movable base 220 is located behind the first movable base 210. The second moving seat 220 is provided with two second connecting rods 250, one end of one second connecting rod 250 is hinged to the second moving seat 220, the other end of one second connecting rod 250 is hinged to one of the connecting blocks 100, one end of the other second connecting rod 250 is hinged to the second moving seat 220, and the other end of the other second connecting rod 250 is hinged to the other connecting block 100. The second movable base 220 is connected to the two connection blocks 100 through two second connection rods 250.

The two first connecting rods 240 and the two second connecting rods 250 are hinged with the two connecting blocks 100 respectively, so that the two first connecting rods 240 and the two second connecting rods 250 form a deformable parallelogram structure. When the parallelogram structure deforms, the two connecting blocks 100 can be drawn close to each other, and at the moment, the first movable seat 210 and the second movable seat 220 are far away from each other; alternatively, the two connection blocks 100 are separated from each other, and at this time, the first movable base 210 and the second movable base 220 are close to each other.

Preferably, the length of the first link 240 and the length of the second link 250 are identical. The first link 240 and the second link 250 are equal in length, so that the two first links 240 and the two second links 250 together form a diamond structure, and both the two connecting blocks 100 can linearly move in the height direction (i.e., in the Z direction) of the intervertebral cage during the process that the first movable seat 210 and the second movable seat 220 approach or separate from each other, so that when the intervertebral cage is implanted into the affected vertebrae and the height of the intervertebral cage is adjusted, the position of the intervertebral cage does not need to be adjusted again to ensure that the connecting blocks 100 are in sufficient contact with the vertebral bodies.

The second movable base 220 extends toward the first movable base 210 (i.e., toward the front side) to form a connecting portion 221, and the connecting portion 221 and the second movable base 220 are integrally formed. The connection portion 221 may be cylindrical, prismatic, or other.

The adjusting rod 230 may be disposed in the locking hole through a bearing and may rotate along an axis thereof, and the adjusting rod 230 may rotate relative to the first movable base 210 without moving linearly. In addition, the adjusting rod 230 may be provided with a limiting portion, the first movable base 210 is formed by connecting an upper portion and a lower portion through bolts, the upper portion and the lower portion are both provided with a clamping groove, the adjusting rod 230 is clamped by the upper portion and the lower portion, the limiting portion is urged to be placed in the clamping groove, and therefore the adjusting rod 230 can rotate relative to the first movable base 210.

One of the adjustment lever 230 and the connection part 221 is provided with an internal thread, and the other of the adjustment lever 230 and the connection part 221 is provided with an external thread connected with the internal thread. If the adjustment rod 230 is internally threaded, the connection part 221 is externally threaded; if the adjustment lever 230 is externally threaded, the connection part 221 is internally threaded.

An inner corner hole 231 is formed at one end of the adjusting lever 230, which is far away from the connecting part 221 (i.e., the front end of the adjusting lever 230). The inner angle hole 231 can be an inner quadrangular hole, an inner hexagonal hole or an inner plum blossom hole, so that a clinician can conveniently use an inner angle wrench to operate the adjusting rod 230, the adjusting rod 230 is screwed into the connecting part 221, and the difficulty in adjusting the height of the intervertebral fusion cage in the operation is reduced. Of course, the adjustment lever 230 may be an outer hexagon bolt.

When the adjusting rod 230 is rotated, the adjusting rod 230 is driven to screw into the connecting part 221, so that the front-back distance between the first moving seat 210 and the second moving seat 220 is shortened, the parallelogram structure is driven to deform, the two connecting blocks 100 are driven to be away from each other, and the height of the intervertebral fusion cage can be adjusted.

Moreover, the lifting assembly 200 adopts the above-mentioned structure design, when the height of the intervertebral cage is increased, one end of the adjusting rod 230 can be prevented from protruding out of the second movable seat 220, so as to affect the vertebral body of the patient.

In addition, other structures of the lifting assembly 200 can be adopted, and only the requirement that the two connecting blocks 100 can be driven to be away from each other is met.

In some embodiments, as shown in fig. 1 and 5, the intervertebral cage further comprises a fixation member 300.

The fixing member 300 is provided with a third connection end connected to the first movable seat 210 and a fourth connection end connectable to a vertebral body. The third connecting end through the fixing piece 300 is connected with the first movable seat 210, so that the first movable seat 210 is fixed relative to the fixing piece 300 and cannot move, and the fourth connecting end through the fixing piece 300 is connected with the vertebral body, so that the fixing piece 300 is fixed relative to the vertebral body, and the problems of subsidence and displacement of the postoperative intervertebral fusion cage are avoided.

In this embodiment, the first movable base 210 is provided with two connection screw holes 211, and the two connection screw holes 211 are respectively located at the left end and the right end of the first movable base 210. And, two fixed members 300 are provided and are respectively located at the left and right sides of the first movable base 210.

Mount 300 includes a connecting plate 310, a connecting bolt 320, and a spinal screw 330.

Wherein the connection plate 310 is provided with a first connection hole and a second connection hole. The second connection holes are provided in two and are respectively located at the upper and lower ends of the connection plate 310.

The coupling bolt 320 is provided with a first male screw portion that can pass through the first coupling hole and be coupled with the coupling screw hole 211. The first connection hole may be a smooth round hole or a threaded hole. The coupling bolt 320 may be a countersunk screw. The connection bolt 320 is screwed into the connection screw hole 211 through the first connection hole, so that the connection plate 310 is fixedly connected to the first movable base 210.

The spinal screw 330 is provided with a second externally threaded portion that can pass through the second attachment hole and attach to a vertebral body. The second connecting hole may be a smooth circular hole or a threaded hole. The spine screw 330 corresponds to the second attachment hole. The spinal screw 330 is correspondingly inserted through the second connecting hole and screwed into the upper and lower vertebral bodies of the patient, so that the connection plate 310 is fixed with the upper and lower vertebral bodies.

Adopt two mounting 300 of such structure, not only can avoid postoperative interbody fusion cage to sink into the patient centrum, take place to shift the scheduling problem and take place to promote clinical treatment effect, can guarantee moreover that interbody fusion cage atress is even, improve stability.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the utility model as set forth in the claims appended hereto.

Claims (10)

1. A height adjustable intervertebral cage, comprising:

the bone grafting device comprises a connecting block (100), a bone grafting bin (130), an outer side surface (110) and an inner side surface (120) are arranged on the connecting block, the outer side surface (110) is opposite to the inner side surface (120), through holes (140) communicated with the bone grafting bin (130) are formed in the outer side surface (110) and the inner side surface (120), a tooth part (150) is arranged on the outer side surface (110), and the tooth part (150) is located on the edge of the outer side surface (110); the two connecting blocks (100) are arranged, and the inner side surfaces (120) of the two connecting blocks (100) are arranged oppositely;

the lifting assembly (200) is arranged between the two connecting blocks (100), the lifting assembly (200) is provided with a first connecting end and a second connecting end, the first connecting end is connected with the inner side face (120) of one connecting block (100), the second connecting end is connected with the inner side face (120) of the other connecting block (100), and the first connecting end and the second connecting end can be mutually closed or far away.

2. The height-adjustable intersomatic cage according to claim 1, characterized in that the connection block (100) comprises a housing (160) and a cover plate (170); the shell (160) is provided with a groove (161) with an opening facing to a cover plate (170), the cover plate (170) is detachably connected with the shell (160), the cover plate (170) and the groove (161) jointly form the bone grafting bin (130), and the cover plate (170) is provided with the tooth part (150).

3. The height-adjustable intersomatic cage according to claim 2, characterized in that the housing (160) is provided with screw holes to which bolts can be connected, and the cover plate (170) is provided with mounting holes (171) corresponding to the screw holes.

4. The height-adjustable intersomatic cage according to claim 3, characterized in that the housing (160) is provided with an annular positioning step (180), the annular positioning step (180) being provided along a rim of the housing (160), the cover plate (170) being fittingly connected to the annular positioning step (180).

5. The height adjustable intersomatic cage according to claim 4, characterized in that the surface of the housing (160) adjacent to the lateral surface (110) is provided with the through hole (140).

6. The height-adjustable intersomatic cage according to any of claims 1 to 5, characterized in that the lifting assembly (200) comprises:

the first moving seat (210) is provided with a clamping hole and two first connecting rods (240), one end of one first connecting rod (240) is hinged to the first moving seat (210), the other end of the one first connecting rod is hinged to one connecting block (100), one end of the other first connecting rod (240) is hinged to the first moving seat (210), and the other end of the other first connecting rod is hinged to the other connecting block (100);

a second movable base (220) which is arranged opposite to the first movable base (210), wherein the second movable base (220) extends towards the first movable base (210) to form a connecting part (221); the second moving seat (220) is provided with two second connecting rods (250), one end of one second connecting rod (250) is hinged to the second moving seat (220), the other end of the second connecting rod is hinged to one connecting block (100), one end of the other second connecting rod (250) is hinged to the second moving seat (220), and the other end of the other second connecting rod is hinged to the other connecting block (100);

and the adjusting rod (230) is arranged in the clamping hole and can rotate along the axis of the adjusting rod, one of the adjusting rod (230) and the connecting part (221) is provided with an internal thread, and the other of the adjusting rod (230) and the connecting part (221) is provided with an external thread connected with the internal thread.

7. The height adjustable intervertebral cage of claim 6 wherein the length of the first link (240) and the length of the second link (250) are both uniform.

8. The height-adjustable intersomatic cage according to claim 6, characterized in that the end of the adjustment rod (230) remote from the connection part (221) is provided with an inner corner hole (231).

9. The height adjustable intersomatic cage according to claim 6, further comprising a fixing member (300); the fixing piece (300) is provided with a third connecting end and a fourth connecting end which can be connected with a vertebral body, and the third connecting end is connected with the first movable seat (210).

10. The height-adjustable intervertebral cage according to claim 9, wherein the first moving seat (210) is provided with a coupling screw hole (211); the fixing member (300) includes:

a connection plate (310) provided with a first connection hole and a second connection hole;

a connecting bolt (320) provided with a first external thread part which can pass through the first connecting hole and is connected with the connecting screw hole;

a spinal screw (330) having a second externally threaded portion capable of passing through the second attachment aperture and attaching to a vertebral body.

Images