Fusion cage capable of expanding lumbar vertebra

Abstract

The invention provides a lumbar vertebra distraction fusion cage, and belongs to the technical field of medical instruments. The lumbar vertebra distraction fusion cage comprises an upper fusion piece, a lower fusion piece, an adjusting piece and an adjusting bolt, a containing groove is formed in the upper end of the lower fusion piece, the adjusting piece is arranged between the side walls of the containing groove in a sliding mode, and the adjusting piece has the freedom degree of sliding towards the upper portion of the rear end of the lower fusion piece; the adjusting bolt is arranged on the side wall of the front end of the lower fusion piece and is in threaded connection with the lower fusion piece, the rear end of the adjusting bolt abuts against the front end of the adjusting piece, the upper fusion piece is arranged on the adjusting piece, the adjusting bolt is rotated to push the adjusting piece to slide towards the position above the rear end of the lower fusion piece, and the adjusting piece pushes the upper fusion piece to move upwards. According to the fusion cage capable of expanding the lumbar vertebra, through rotation of the adjusting bolt, the adjusting piece is pushed to move towards the upper rear portion, the upper fusion piece is pushed upwards, the height of the fusion cage is adjusted, implantation is facilitated, and harm to a patient is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a lumbar vertebrae distractable fusion cage. BACKGROUND

[0002] Lumbar interbody fusion is one of the effective methods for treating degenerative lumbar intervertebral disc herniation, reconstructing spinal stability and correcting abnormal load bearing mode of the lumbar vertebrae. A lumbar fusion cage is widely used in lumbar interbody fusion. The lumbar fusion cage is implanted at the diseased site of the patient to achieve the purpose of functional reconstruction. Common lumbar fusion cages are mostly designed with fixed inclination and height. In order to match different patients, the lumbar fusion cage is designed with multiple different specifications. The height is fixed and does not have the function of height adjustment. However, the intervertebral height is different between different patients. During the operation process, a larger incision needs to be made to implant the lumbar fusion cage, which causes great trauma to the patient. The doctor needs to use a trial model and other instruments to measure the intervertebral space height of the patient step by step, and select the appropriate lumbar fusion cage. In this process, the patient's nerve and muscle tissue will be inevitably disturbed multiple times, causing harm to the patient and being not conducive to the recovery of the patient, which affects the operation effect. SUMMARY

[0003] The purpose of the present application is to provide a lumbar vertebrae distractable fusion cage, which aims to solve the problems.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is to provide a lumbar vertebrae distractable fusion cage, which comprises an upper fusion member, a lower fusion member, an adjusting member and an adjusting bolt. The upper end of the lower fusion member is provided with a containing groove. The adjusting member is slidingly arranged between the side walls of the containing groove. The adjusting member has the freedom to slide upwards towards the rear end of the lower fusion member. The adjusting bolt is arranged on the front end side wall of the lower fusion member. The adjusting bolt is threadedly connected with the lower fusion member. The rear end of the adjusting bolt abuts against the front end of the adjusting member. The upper fusion member is arranged on the adjusting member. The adjusting bolt is rotated. The adjusting bolt pushes the adjusting member to slide upwards towards the rear end of the lower fusion member. The adjusting member pushes the upper fusion member to move upwards.

[0005] In a possible implementation manner, the adjusting member comprises an adjusting plate and a left sliding column. The left sliding column is arranged on the left side of the adjusting plate. A left sliding groove is arranged on the left side wall of the lower fusion member. The left sliding column is slidingly arranged in the left sliding groove. The height of the left sliding groove gradually increases away from the front end of the lower fusion member.

[0006] In a possible implementation manner, a right sliding column is arranged on the right side of the adjusting plate. A right sliding groove is arranged on the right side wall of the lower fusion member. The right sliding column is slidingly arranged in the right sliding groove. The height of the right sliding groove gradually increases away from the front end of the lower fusion member.

[0007] In a possible implementation, the left slide post is provided with two groups, which are respectively arranged at the front end and the rear end of the adjusting plate; the left slide groove is correspondingly arranged with the left slide post; the right slide post is provided with two groups, which are respectively arranged at the front end and the rear end of the adjusting plate; and the right slide groove is correspondingly arranged with the right slide post.

[0008] In a possible implementation, the inclination angle of the right slide groove is greater than the inclination angle of the left slide groove.

[0009] In a possible implementation, the adjusting plate is provided with an adjusting weight reduction groove, which is arranged along the length direction of the adjusting plate.

[0010] In a possible implementation, the lower end surface of the upper fusion piece is provided with a sliding block, which is arranged in the accommodating groove.

[0011] In a possible implementation, the height of the upper fusion piece gradually increases from left to right, and the height of the lower fusion piece gradually increases from left to right.

[0012] In a possible implementation, the width of the middle part of the upper fusion piece is greater than the width of the front end and the rear end of the upper fusion piece, and the height of the middle part of the upper fusion piece is greater than the height of the front end and the rear end of the upper fusion piece.

[0013] In a possible implementation, the middle part of the upper fusion piece is provided with an upper weight reduction groove, which is arranged along the length direction of the upper fusion piece; and the middle part of the lower fusion piece is provided with a lower weight reduction groove, which is arranged along the length direction of the lower fusion piece.

[0014] The lumbar vertebrae expandable fusion cage provided by the application has the following beneficial effects:

[0015] Compared with the prior art, the lumbar vertebrae expandable fusion cage comprises an upper fusion piece, a lower fusion piece, an adjusting piece and an adjusting bolt, the upper end of the lower fusion piece is provided with an accommodating groove, the adjusting piece is arranged at the groove bottom of the accommodating groove, the adjusting piece has a sliding freedom to the upper part of the rear end of the lower fusion piece along the side wall of the accommodating groove, the upper fusion piece is arranged on the adjusting piece, the adjusting bolt is arranged on the front side wall of the accommodating groove and abuts against the front end of the adjusting piece, the adjusting bolt is rotated to push the adjusting piece to slide to the upper part of the rear end of the lower fusion piece, the adjusting piece pushes the upper fusion piece to move upward, the fusion cage is expanded, the surgical incision is small, the implantation is facilitated, the height of the fusion cage is adjusted according to the actual situation of the patient, and the harm to the patient is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0017] Figure 1 A perspective structural schematic diagram of the lumbar vertebra expandable fusion cage provided by the embodiment of the present application is shown in the figure.

[0018] Figure 2 A front view structural schematic diagram of the lumbar vertebra expandable fusion cage provided by the embodiment of the present application is shown in the figure.

[0019] Figure 3 A top view structural schematic diagram of the lumbar vertebra expandable fusion cage provided by the embodiment of the present application is shown in the figure.

[0020] Figure 4 A right view structural schematic diagram of the lumbar vertebra expandable fusion cage provided by the embodiment of the present application is shown in the figure.

[0021] Figure 5 An exploded structural schematic diagram of the lumbar vertebra expandable fusion cage provided by the embodiment of the present application is shown in the figure.

[0022] Figure 6 A front view structural schematic diagram of the upper fusion member used by the embodiment of the present application is shown in the figure.

[0023] Figure 7 A perspective structural schematic diagram of the lower fusion member used by the embodiment of the present application is shown in the figure.

[0024] In the figure: 1, upper fusion member; 2, sliding block; 3, upper weight-reducing groove; 4, lower fusion member; 5, accommodating groove; 6, left sliding groove; 7, right sliding groove; 8, lower weight-reducing groove; 9, adjusting plate; 10, left sliding column; 11, right sliding column; 12, adjusting weight-reducing groove; 13, adjusting bolt. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0026] Please refer to Figures 1 to 7, a specific embodiment of the lumbar spine expandable cage provided by the present application is described, including the upper fusion piece 1, the lower fusion piece 4, the adjusting piece and the adjusting bolt 13, the upper end of the lower fusion piece 4 is provided with the accommodating groove 5, the adjusting piece is slidingly arranged between the side walls of the accommodating groove 5, the adjusting piece has the freedom to slide upwards to the rear end of the lower fusion piece 4, the adjusting bolt 13 is arranged on the front end side wall of the lower fusion piece 4, the adjusting bolt 13 is threadedly connected with the lower fusion piece 4, the rear end of the adjusting bolt 13 abuts against the front end of the adjusting piece, the upper fusion piece 1 is arranged on the adjusting piece, the adjusting bolt 13 is rotated, the adjusting bolt 13 pushes the adjusting piece to slide upwards to the rear end of the lower fusion piece 4, and the adjusting piece pushes the upper fusion piece 1 to move upwards.

[0027] The lumbar spine expandable cage provided by the present application, compared with the prior art, includes the upper fusion piece 1, the lower fusion piece 4, the adjusting piece and the adjusting bolt 13, the upper end of the lower fusion piece 4 is provided with the accommodating groove 5, the adjusting piece is arranged on the groove bottom of the accommodating groove 5, the adjusting piece has the freedom to slide upwards to the rear end of the lower fusion piece 4 along the side walls of the accommodating groove 5, the upper fusion piece 1 is arranged on the adjusting piece, the adjusting bolt 13 is arranged on the front side wall of the accommodating groove 5, and the rear end abuts against the front end of the adjusting piece, the adjusting bolt 13 is rotated, the adjusting bolt 13 pushes the adjusting piece to slide upwards to the rear end of the lower fusion piece 4, and the adjusting piece pushes the upper fusion piece 1 to move upwards, so that the cage is expanded, the surgical incision is small, the implantation is facilitated, the height of the cage is adjusted according to the actual condition of the patient, and the harm to the patient is reduced.

[0028] Specifically, please refer to Figures 1 to 7 , including the upper fusion piece 1, the lower fusion piece 4, the adjusting piece and the adjusting bolt 13, one end provided with the adjusting bolt 13 is defined as the front end, and the end away from the adjusting bolt 13 is defined as the rear end, the upper end of the lower fusion piece 4 is provided with the accommodating groove 5, the adjusting piece is horizontally arranged on the groove bottom of the accommodating groove 5, the upper fusion piece 1 is arranged on the adjusting piece, the adjusting piece is slidingly arranged between the side walls of the accommodating groove 5, the adjusting bolt 13 is threadedly connected with the front side wall of the accommodating groove 5, the rear end of the adjusting bolt 13 abuts against the front end of the adjusting piece, the adjusting bolt 13 moves towards the rear end, pushes the adjusting piece, the adjusting piece slides upwards to the rear end of the lower fusion piece 4, the adjusting piece moves upwards relative to the groove bottom of the accommodating groove 5, simultaneously pushes the upper fusion piece 1 to move upwards relative to the lower fusion piece 4, the cage is expanded, abuts against the affected part of the patient, the height of the cage is adjusted according to the actual condition of the patient, and the harm to the patient is reduced.

[0029] Further, please refer to Figures 1 to 7 , during the expansion process of the cage, the distance between the upper fusion piece 1 and the lower fusion piece 4 is increased by 0.5 mm every rotation of the adjusting bolt 13.

[0030] As a specific embodiment of the lumbar spine expandable cage provided by the present application, please refer toFigure 1 、 Figure 5 and Figure 7 The adjusting member comprises an adjusting plate 9 and a left sliding column 10, the left sliding column 10 is arranged at the left side of the adjusting plate 9, a left sliding groove 6 is arranged on the left side wall of the lower fusion member 4, the left sliding column 10 is slidingly arranged in the left sliding groove 6, and the height of the left sliding groove 6 gradually increases away from the front end of the lower fusion member 4.

[0031] Specifically, please refer to Figure 1 、 Figure 5 and Figure 7 The adjusting member comprises an adjusting plate 9 and a left sliding column 10, the adjusting plate 9 is horizontally arranged in the accommodating groove 5, the left sliding column 10 is arranged at the left side of the adjusting plate 9, the left sliding column 10 can be fixed at the left side of the adjusting plate 9 through a threaded structure, and the left sliding column 10 is convenient to install and disassemble, a left sliding groove 6 for limiting the displacement of the left sliding column 10 is arranged on the left side wall of the lower fusion member 4, the left sliding column 10 has the freedom of sliding in the left sliding groove 6, the left sliding groove 6 is arranged in an inclined manner, the height of the rear end of the left sliding groove 6 is higher than that of the front end, the rear end of the adjusting bolt 13 abuts against the front end of the adjusting plate 9, the adjusting bolt 13 pushes the adjusting plate 9 to the rear end, and under the limitation of the left sliding groove 6, the adjusting plate 9 moves upward synchronously, and the upper fusion member 1 is pushed to move upward.

[0032] As a specific embodiment of the lumbar spine expandable fusion cage provided by the present application, please refer to Figure 1 、 Figure 4 、 Figure 5 and Figure 7 The right side of the adjusting plate 9 is provided with a right sliding column 11, a right sliding groove 7 is arranged on the right side wall of the lower fusion member 4, the right sliding column 11 is slidingly arranged in the right sliding groove 7, and the height of the right sliding groove 7 gradually increases away from the front end of the lower fusion member 4.

[0033] Specifically, please refer to Figure 1 、 Figure 4 、 Figure 5 and Figure 7 The right side of the adjusting plate 9 is provided with a right sliding column 11, the right sliding column 11 can be fixed at the right side of the adjusting plate 9 through a threaded structure, and the right sliding column 11 is convenient to install and disassemble, a right sliding groove 7 for limiting the displacement of the right sliding column 11 is arranged on the right side wall of the lower fusion member 4, the right sliding column 11 has the freedom of sliding in the right sliding groove 7, the right sliding groove 7 is arranged in an inclined manner, the height of the rear end of the right sliding groove 7 is higher than that of the front end, the rear end of the adjusting bolt 13 abuts against the front end of the adjusting plate 9, the adjusting bolt 13 pushes the adjusting plate 9 to the rear end, and under the limitation of the right sliding groove 7, the adjusting plate 9 moves upward synchronously, and the upper fusion member 1 is pushed to move upward.

[0034] As a specific embodiment of the lumbar spine expandable fusion cage provided by the present application, please refer to Figure 1 、 Figure 4 、 Figure 5and Figure 7 The left slide column 10 is provided with two groups, which are respectively arranged at the front end and the rear end of the adjusting plate 9, the left slide groove 6 is arranged in correspondence with the left slide column 10, the right slide column 11 is provided with two groups, which are respectively arranged at the front end and the rear end of the adjusting plate 9, and the right slide groove 7 is arranged in correspondence with the right slide column 11.

[0035] Specifically, please refer to Figure 1 , Figure 4 , Figure 5 and Figure 7 The left slide column 10 is provided with two groups, one group of left slide columns 10 is arranged at the front end of the adjusting plate 9, and the other group of left slide columns 10 is arranged at the rear end of the adjusting plate 9, the left slide groove 6 is arranged in one-to-one correspondence with the left slide column 10, the right slide column 11 is provided with two groups, one group of right slide columns 11 is arranged at the front end of the adjusting plate 9, and the other group of right slide columns 11 is arranged at the rear end of the adjusting plate 9, and the right slide groove 7 is arranged in one-to-one correspondence with the right slide column 11, thereby increasing the stability of the sliding of the adjusting plate 9.

[0036] Further, please refer to Figure 1 , Figure 4 , Figure 5 and Figure 7 The left slide column 10 and the right slide column 11 are symmetrically arranged, thereby increasing the stability of the sliding of the adjusting plate 9.

[0037] As a specific embodiment of the lumbar spine distractible cage provided by the present application, please refer to Figure 1 , Figure 4 , Figure 5 and Figure 7 The inclination angle of the right slide groove 7 is greater than the inclination angle of the left slide groove 6.

[0038] Specifically, please refer to Figure 1 , Figure 4 , Figure 5 and Figure 7 The inclination angle of the right slide groove 7 relative to the horizontal plane is greater than the inclination angle of the left slide groove 6 relative to the horizontal plane, in the process of pushing the adjusting plate 9 to slide to the rear end, under the limitation of the right slide groove 7 and the left slide groove 6, the right side of the adjusting plate 9 is raised to a distance higher than the left side, that is, the adjusting plate 9 is gradually inclined, the inner wall of the left slide groove 6 is provided with an inclination angle matching the sliding track of the left slide column 10, and the inner wall of the right slide groove 7 is provided with an inclination angle matching the sliding track of the right slide column 11, thereby increasing the stability of the sliding of the adjusting plate 9.

[0039] As a specific embodiment of the lumbar spine distractible cage provided by the present application, please refer to Figure 1 , Figure 3 , Figure 5 and Figure 7 The adjusting plate 9 is provided with an adjusting weight reduction groove 12, and the adjusting weight reduction groove 12 is arranged along the length direction of the adjusting plate 9.

[0040] Specifically, please refer to Figure 1 , Figure 3 , Figure 5 and Figure 7 , the adjusting plate 9 is provided with an adjusting weight reduction groove 12 arranged along the length direction of the adjusting plate 9, the front end side wall of the adjusting weight reduction groove 12 is in a circular arc shape, and the tail end of the adjusting weight reduction groove 12 is open, thereby reducing the weight of the device.

[0041] As a specific embodiment of the lumbar spine expandable cage provided by the present application, please refer to Figures 1 to 7 , the upper fusion member 1 is provided with a sliding block 2 at the lower end face, and the sliding block 2 is arranged in the accommodating groove 5.

[0042] Specifically, please refer to Figures 1 to 7 , the upper fusion member 1 is provided with a sliding block 2 at the lower end face, and the sliding block 2 is arranged in the accommodating groove 5, in the initial state, the lower end face of the outer side wall of the upper fusion member 1 is completely coincident with the upper end face of the outer side wall of the lower fusion member 4, the left side wall of the sliding block 2 is provided with an inclined surface, the inclined surface is inclined to the right side wall, under the action of the inclined surface, the lower end face of the sliding block 2 is always located on the upper end face of the adjusting plate 9, the inclined angle of the upper fusion member 1 and the adjusting plate 9 is consistent, the left side and the right side of the upper fusion member 1 are raised at different distances, and the cage is implanted in a side-in mode, which is more in line with the physiological structure of human bones.

[0043] As a specific embodiment of the lumbar spine expandable cage provided by the present application, please refer to Figure 1 , Figure 2 , Figures 5 to 7 , the height of the upper fusion member 1 gradually increases from left to right, and the height of the lower fusion member 4 gradually increases from left to right.

[0044] Specifically, please refer to Figure 1 , Figure 2 , Figures 5 to 7 , the height of the right side of the upper fusion member 1 is greater than that of the left side, and the height of the right side of the lower fusion member 4 is greater than that of the left side, which is more in line with the physiological structure of human bones.

[0045] As a specific embodiment of the lumbar spine expandable cage provided by the present application, please refer to Figures 1 to 3 , Figures 5 to 7 , the width of the middle part of the upper fusion member 1 is greater than the width of the front and rear ends of the upper fusion member 1, and the height of the middle part of the upper fusion member 1 is greater than the height of the front and rear ends of the upper fusion member 1.

[0046] Specifically, please refer to Figures 1 to 3 , Figures 5 to 7The width of the upper end of the upper fusion member 1 is smaller than the width of the middle part, and the height of the upper end of the upper fusion member 1 is smaller than the height of the middle part, which facilitates the implantation of the device. Similarly, the width of the lower end of the lower fusion member 4 is smaller than the width of the middle part, and the height of the lower end of the lower fusion member 4 is smaller than the height of the middle part.

[0047] As a specific embodiment of the lumbar spine expandable cage provided by the present application, please refer to Figures 1 to 3 , Figures 5 to 7 The middle part of the upper fusion member 1 is provided with an upper weight-reducing groove 3 arranged along the length direction of the upper fusion member 1, and the middle part of the lower fusion member 4 is provided with a lower weight-reducing groove 8 arranged along the length direction of the lower fusion member 4.

[0048] Specifically, please refer to Figures 1 to 7 , ​ The middle part of the upper fusion member 1 is provided with an upper weight-reducing groove 3 arranged along the length direction, and the middle part of the lower fusion member 4 is provided with a lower weight-reducing groove 8 arranged along the length direction. In the initial state, the inner side wall of the upper weight-reducing groove 3 coincides with the inner side wall of the lower weight-reducing groove 8.

[0049] Further, please refer to ​ The upper end surface of the upper fusion member 1 and the lower end surface of the lower fusion member 4 are provided with a porous structure for facilitating fusion.

[0050] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lumbar vertebral fusion device with expandable structure, characterized in that, The assembly includes an upper fusion member, a lower fusion member, an adjusting member, and an adjusting bolt. The upper end of the lower fusion member is provided with a receiving groove. The adjusting member is slidably disposed between the side walls of the receiving groove and has the freedom to slide upward toward the rear end of the lower fusion member. The adjusting bolt is disposed on the front side wall of the lower fusion member and is threadedly connected to the lower fusion member. The rear end of the adjusting bolt abuts against the front end of the adjusting member. The upper fusion member is disposed on the adjusting member. When the adjusting bolt is rotated, the adjusting bolt pushes the adjusting member to slide upward toward the rear end of the lower fusion member, and the adjusting member pushes the upper fusion member to move upward.

2. The lumbar vertebral expandable fusion device as described in claim 1, characterized in that, The adjusting component includes an adjusting plate and a left sliding column. The left sliding column is disposed on the left side of the adjusting plate. A left sliding groove is provided on the left side wall of the lower fusion component. The left sliding column is slidably disposed in the left sliding groove. The height of the left sliding groove gradually increases as it moves away from the front end of the lower fusion component.

3. The lumbar vertebral expandable fusion device as described in claim 2, characterized in that, A right sliding column is provided on the right side of the adjusting plate, and a right sliding groove is provided on the right side wall of the lower fusion member. The right sliding column is slidably disposed in the right sliding groove, and the height of the right sliding groove gradually increases as it moves away from the front end of the lower fusion member.

4. The lumbar vertebral expandable fusion device as described in claim 3, characterized in that, Two sets of left sliding columns are provided, respectively located at the front and rear ends of the adjustment plate. The left sliding groove is correspondingly provided with the left sliding column. Two sets of right sliding columns are provided, respectively located at the front and rear ends of the adjustment plate. The right sliding groove is correspondingly provided with the right sliding column.

5. A lumbar vertebral expandable fusion device as described in claim 4, characterized in that, The tilt angle of the right slide is greater than that of the left slide.

6. The lumbar vertebral expandable fusion device as described in claim 2, characterized in that, The adjustment plate is provided with an adjustment weight reduction groove, which is arranged along the length direction of the adjustment plate.

7. The lumbar vertebral expandable fusion device as described in claim 1, characterized in that, A sliding block is provided on the lower end face of the upper fusion component, and the sliding block is disposed in the receiving groove.

8. The lumbar vertebral expandable fusion device as described in claim 1, characterized in that, The height of the upper fusion member gradually increases from left to right, and the height of the lower fusion member gradually increases from left to right.

9. A lumbar vertebral expandable fusion device as described in claim 1, characterized in that, The width of the middle part of the upper fusion member is greater than the width of the front and rear ends of the upper fusion member, and the height of the middle part of the upper fusion member is greater than the height of the front and rear ends of the upper fusion member.

10. A lumbar vertebral expandable fusion device as described in claim 1, characterized in that, The upper fusion component has an upper weight-reducing groove in its middle part, which is arranged along the length direction of the upper fusion component. The lower fusion component has a lower weight-reducing groove in its middle part, which is arranged along the length direction of the lower fusion component.

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