Adjustable interbody fusion cage

Abstract

The utility model discloses an adjustable interbody fusion cage which comprises a group of fusion blocks which are symmetrically arranged up and down and further comprises a front propelling block, a rear propelling block and an adjusting assembly, the adjusting assembly is connected with the front propelling block and the rear propelling block and can adjust the distance between the front propelling block and the rear propelling block, and the front propelling block comprises a group of combined plates of the same structure. And the two combined plates are connected through sunk screws. The distance between the upper fusion block and the lower fusion block is adjusted through the arranged adjusting assembly, then the range of the practical gap of the fusion device is adjusted, and continuous height adjustment of the fusion device is achieved. Meanwhile, the bone paste injection channel is arranged, so that the artificial bone paste can be conveniently injected after the fusion cage is implanted, and different amounts of artificial bone paste can be implanted according to different operation conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of intervertebral fusion devices, in particular to an adjustable intervertebral fusion device. Background Art

[0002] Degenerative spinal disease is a common disease. The treatment of lumbar degenerative spondylolisthesis, segmental instability, disc-related diseases, traumatic lumbar spondylolisthesis, etc. generally requires lumbar fixation and fusion. The use of intervertebral fusion devices can maintain the height of the intervertebral space, restore the support of the anterior and middle columns, increase the capacity of the intervertebral foramen, relieve nerve root compression, and prevent intervertebral space collapse and the formation of pseudoarthrosis. With the development of minimally invasive surgery, higher requirements are placed on the design of intervertebral fusion devices. At present, most fusion devices are conventional specifications with fixed models and sizes, which make it difficult to achieve continuous size adjustment. It is also difficult to insert matching models of fusion devices under endoscopic channels, which requires further improvement. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] The technical problem to be solved by the utility model is that currently most fusion devices are conventional specifications with fixed models and sizes, and it is difficult to achieve continuous size adjustment. It is also difficult to insert a fusion device of a matching model under an endoscopic channel, and further improvements are needed.

[0005] (II) Technical solution

[0006] In order to solve the above problems, the utility model provides the following technical solutions:

[0007] An adjustable intervertebral fusion device comprises a group of fusion blocks symmetrically arranged in the upper and lower parts, and also comprises a front thrust block, a rear thrust block and an adjustment component, wherein the adjustment component connects the front thrust block and the rear thrust block and can adjust the distance between the two, the front thrust block comprises a group of combination plates with the same structure, and the two combination plates are connected by countersunk screws, the adjustment component comprises a threaded tube, a screw, a rotating shaft and an adjustment rod, the threaded tube and the screw are each provided with two and are symmetrically arranged in the left and right, one end of the screw is connected to the threaded tube by a threaded connection, and the other end is connected to the rotating shaft by a bevel gear and a bevel gear connection, and the end of the adjustment rod close to the rotating shaft is also connected to the rotating shaft by a bevel gear and a bevel gear connection, and when the adjusting rod is rotated, the rotating shaft can drive the two screws to rotate together.

[0008] Furthermore, the combination plate is provided with a rotating shaft mounting groove, an adjusting rod mounting groove and two screw mounting grooves, the adjusting rod is connected to the adjusting rod mounting groove via two bearings, the rotating shaft is connected to the rotating shaft mounting groove via a group of bearings, and the two screws are respectively connected to the two screw mounting grooves via bearings.

[0009] Furthermore, both ends of the rotating shaft are connected to the combined plate through bearings.

[0010] Furthermore, the combination plate and the rear propulsion block are provided with a slide groove for connecting the fusion block, and the cross-section of the slide groove is an inverted T-shaped structure.

[0011] Furthermore, the fusion block is also provided with a slide table matched with the slide groove.

[0012] Furthermore, a plurality of anti-skid bosses are provided on the fusion block, and the plurality of anti-skid bosses are evenly arranged on the fusion block.

[0013] Furthermore, the fusion block is provided with a bone mud avoidance opening.

[0014] Furthermore, the combined plate is provided with a bone mud injection channel for facilitating the injection of artificial bone mud into the fusion device, and the cross-section of the bone mud injection channel is circular.

[0015] (III) Beneficial effects

[0016] The beneficial effects of the utility model are: the distance between the upper and lower fusion blocks can be adjusted by the adjustment component, thereby adjusting the practical gap range of the fusion device and realizing continuous adjustment of the height of the fusion device. At the same time, the bone mud injection channel is provided to facilitate the injection of artificial bone mud after the fusion device is implanted, so that different amounts of artificial bone mud can be implanted according to different surgical conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded view of the utility model;

[0018] Figure 2 It is a three-dimensional diagram of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the adjustment component of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the combined board of the utility model;

[0021] Figure 5 It is a front view of the front propulsion block of the utility model;

[0022] In the figure: 1-fusion block, 2-front push block, 3-rear push block, 4-adjustment assembly, 5-slide, 6-slide, 7-anti-slip boss, 9-bone mud injection channel, 10-inclined surface;

[0023] 201-combination plate, 202-shaft mounting slot, 203-adjusting rod mounting slot, 204-screw mounting slot;

[0024] 401-threaded tube, 402-screw, 403-rotating shaft, 404-adjusting rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figures 1 to 5 An adjustable intervertebral fusion device includes a set of fusion blocks 1 symmetrically arranged in the upper and lower parts, and also includes a front push block 2, a rear push block 3 and an adjustment component 4. The adjustment component 4 connects the front push block 2 and the rear push block 3, and can adjust the distance between the two, so as to adjust the overall height of the fusion device according to different surgical conditions and meet the needs. Compared with the traditional fixed-height fusion device, it is more versatile and more flexible. The front push block 2 is designed as a split structure, with an upper and lower structure. The front push block 2 includes a set of combination plates 201 with the same structure. The two combination plates 201 are connected by countersunk screws to ensure the rigidity of the front push block 2 that is combined into a whole by the two combination plates 201. The adjusting component 4 comprises a threaded tube 401, a screw rod 402, a rotating shaft 403 and an adjusting rod 404. The threaded tube 401 and the screw rod 402 are each provided with two and are symmetrically arranged on the left and right. One end of the screw rod 402 is connected to the threaded tube 401 by a threaded connection, and the other end is connected to the rotating shaft 403 by a bevel gear and a bevel gear connection. When the screw rod 402 rotates, a part of the screw rod 402 enters into the threaded tube 401. Because the front propulsion block 2 is connected to the screw rod 402 and the rear propulsion block 3 is connected to the threaded tube 401, when the screw rod 402 rotates and enters into the threaded tube 401, the distance between the front propulsion block 2 and the rear propulsion block 3 is shortened.

[0027] A set of vertically symmetrical inclined surfaces 10 are provided on both the front propulsion block 2 and the rear propulsion block 3 , and the inclined surfaces 10 cooperate with the fusion block 1 .

[0028] The combination plate 201 and the rear propulsion block 3 are both provided with a slide 5 for connecting the fusion block 1. The cross section of the slide 5 is an inverted T-shaped structure, and is arranged on the inclined surface 10. In addition, there are two slides 5 arranged on each inclined surface 10, which ensures the stability of the fusion block 1 when moving. The fusion block 1 is also provided with a slide 6 that cooperates with the slide 5. When the distance between the front propulsion block 2 and the rear propulsion block 3 is shortened by adjusting the assembly 4, the fusion block 1 moves upward through the cooperation of the slide 5 and the slide 6. This allows the height of the entire fusion device to be adjusted.

[0029] The end of the adjusting rod 404 close to the rotating shaft 403 is also connected to the rotating shaft 403 by connecting bevel gears to bevel gears. The rotating shaft 403 is rotated by rotating the adjusting rod 404 through the connection transmission of the two bevel gears. When the adjusting rod 404 is rotated, the rotating shaft 403 can drive the two screw rods 402 to rotate together. Then the rotating shaft 403 also realizes the purpose of rotating the screw rods 402 by connecting and transmitting the bevel gears.

[0030] The combined plate 201 is provided with a shaft mounting groove 202, an adjustment rod mounting groove 203 and two screw mounting grooves 204. The adjustment rod 404 is connected to the adjustment rod mounting groove 203 through two bearings. The bearing connection ensures that the adjustment rod 404 can rotate while also improving the stability of the adjustment rod 404 when rotating. The shaft 403 is connected to the shaft mounting groove 202 through a set of bearings. The shaft 403 is connected to the rotation mounting groove 202 through the bearings, which provides the basic requirements for the rotation ability of the station 403 and also improves the stability of the shaft 403 when rotating. In order to ensure the stability of the rotation of the screw 402, the two screws 402 are respectively connected to the two screw mounting grooves 204 through bearings.

[0031] Specifically, both ends of the rotating shaft 403 are connected to the combined plate 201 through bearings. A plurality of anti-skid bosses 7 are also provided on the fusion block 1, and the plurality of anti-skid bosses 7 are evenly arranged on the fusion block 1. The fusion block 1 is provided with a bone mud avoidance opening 8. The combined plate 201 is provided with a bone mud injection channel 9 for facilitating the injection of artificial bone mud into the fusion device, and the cross section of the bone mud injection channel 9 is circular.

[0032] Working principle: first, the staff adjusts the height of the fusion device to the lowest, then places the fusion device into the intervertebral space, and uses an Allen wrench to rotate the adjustment rod 404. When the adjustment rod 404 rotates, the shaft 403 is driven to rotate, and then the shaft 403 drives the screw 402 to rotate. When the screw 402 rotates, because it is threadedly connected with the threaded tube 401, the total length of the connection between the two becomes shorter, thereby shortening the distance between the front propulsion block 2 and the rear propulsion block 3. While the front propulsion block 1 and the rear propulsion block 2 are moving relative to each other, the height of the fusion block 1 becomes higher through the guiding effect of the inclined surface 10, and the coordinated use of the chute 5 and the chute 6 ensures the stability of the entire adjustment process. When the overall height of the fusion device reaches the required height, the adjustment is stopped. Then the medical staff injects the prepared artificial bone mud into the interior of the fusion device through the bone mud injection channel 9.

[0033] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it should be understood that although this specification is described in accordance with the implementation mode, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An adjustable intervertebral fusion cage, comprising a set of fusion blocks (1) symmetrically arranged in an upper and lower direction, characterized in that: The invention also comprises a front propulsion block (2), a rear propulsion block (3) and an adjustment component (4), wherein the adjustment component (4) connects the front propulsion block (2) and the rear propulsion block (3) and can adjust the distance between the two. The front propulsion block (2) comprises a group of combination plates (201) with the same structure, and the two combination plates (201) are connected by countersunk screws. The adjustment component (4) comprises a threaded tube (401), a screw rod (402), a rotating shaft (403) and an adjustment rod (404). The threaded tube (401) and the rear propulsion block (3) are connected by countersunk screws. Two screw rods (402) are provided and are symmetrically arranged on the left and right sides. One end of the screw rod (402) is connected to the threaded tube (401) by a threaded connection, and the other end is connected to the rotating shaft (403) by a bevel gear and a bevel gear connection. The end of the adjusting rod (404) close to the rotating shaft (403) is also connected to the rotating shaft (403) by a bevel gear and a bevel gear connection. When the adjusting rod (404) is rotated, the rotating shaft (403) can drive the two screw rods (402) to rotate together.

2. The adjustable intervertebral fusion cage according to claim 1, characterized in that: The combined plate (201) is provided with a rotating shaft installation groove (202), an adjusting rod installation groove (203) and two screw rod installation grooves (204); the adjusting rod (404) is connected to the adjusting rod installation groove (203) via two bearings; the rotating shaft (403) is connected to the rotating shaft installation groove (202) via a group of bearings; and the two screw rods (402) are respectively connected to the two screw rod installation grooves (204) via bearings.

3. The adjustable intervertebral fusion cage according to claim 2, characterized in that: Both ends of the rotating shaft (403) are connected to the combined plate (201) via bearings.

4. The adjustable intervertebral fusion cage according to claim 2, characterized in that: The combination plate (201) and the rear propulsion block (3) are both provided with a slide groove (5) for connecting to the fusion block (1), and the cross section of the slide groove (5) is an inverted T-shaped structure.

5. The adjustable intervertebral fusion cage according to claim 4, characterized in that: The fusion block (1) is also provided with a slide platform (6) that matches the slide groove (5).

6. The adjustable intervertebral fusion cage according to claim 5, characterized in that: A plurality of anti-slip bosses (7) are also provided on the fusion block (1), and the plurality of anti-slip bosses (7) are evenly arranged on the fusion block (1).

7. The adjustable intervertebral fusion cage according to claim 6, characterized in that: The fusion block (1) is provided with a bone mud avoidance opening (8).

8. The adjustable intervertebral fusion cage according to claim 1, characterized in that: The combined plate (201) is provided with a bone mud injection channel (9) for facilitating the injection of artificial bone mud into the interior of the fusion device, and the cross-section of the bone mud injection channel (9) is circular.

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