Spine fusion cage

Abstract

The invention provides a spine fusion cage which comprises a supporting assembly, a driving assembly and a sliding block assembly, the supporting assembly comprises an upper supporting piece and a lower supporting piece which are oppositely arranged, and the upper supporting piece and the lower supporting piece extend from a first end to a second end; the driving assembly is arranged between the upper supporting piece and the lower supporting piece in the horizontal direction and comprises a first driving piece and a second driving piece which are in transmission connection with each other, and when one of the first driving piece and the second driving piece is driven, the other one can be driven to move. The first driving piece and the second driving piece are arranged at the first end and the second end of the supporting assembly correspondingly. The sliding block assembly is located between the upper supporting piece and the lower supporting piece and comprises a first sliding block in transmission connection with the first driving piece and a second sliding block in transmission connection with the second driving piece. The driving assembly is used for being operated to drive the first sliding block and the second sliding block to move oppositely or oppositely so that the upper supporting piece can move relative to the lower supporting piece in the height direction.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a spinal fusion device. Background Art

[0002] When implanting a spinal fusion device between vertebrae, in order to enable the smooth implantation of the spinal fusion device, the incision size between vertebrae is usually greater than or equal to the size of the spinal fusion device. However, the space between vertebrae is limited, and the intervertebral space of some patients will be further reduced due to lesions. Moreover, the nerves distributed near the incision will also cause a certain block to the implantation of the spinal fusion device, imposing greater limitations on the size of the spinal fusion device. However, the spinal fusion device also needs to have sufficient height to meet the actual height requirement for spinal distraction during the treatment process, so as to better restore the physiological structure of the patient.

[0003] In the related art, the structure and size of the spinal fusion device are fixed, but the intervertebral height of the human body varies from person to person. During the operation, it is impossible to adjust the height of the spinal fusion device to suit the different intervertebral heights of different patients, so that the spinal fusion device cannot be fully applicable to the intervertebral height of the human body, affecting the treatment effect. Moreover, when the intervertebral space is small, during the process of restoring the spinal height by implanting the spinal fusion device between the patient's vertebrae, it is necessary to knock in the spinal fusion device or use other instruments to distract the vertebrae in order to place the spinal fusion device into the intervertebral incision. Knocking in the spinal fusion device will cause damage to the bones near the incision, and using other instruments to distract the spine will cause additional wounds. The operation is difficult and prone to slow postoperative recovery of the patient, which will also affect the treatment effect. Summary of the Invention

[0004] Based on this, it is necessary to provide a spinal fusion device, aiming to reduce the difficulty of bone grafting, expand the applicable range of the spinal fusion device, and enable better establishment and maintenance of lumbar stability after the spinal fusion device is implanted.

[0005] An embodiment of the present application provides a spinal fusion device. The spinal fusion device includes a support assembly, a driving assembly, and a slider assembly. The support assembly includes an upper support member and a lower support member that are oppositely arranged in the height direction; in the horizontal direction, the upper support member and the lower support member extend from a first end to a second end; the driving assembly is horizontally arranged between the upper support member and the lower support member. The driving assembly includes a first driving member and a second driving member that are in transmission connection with each other. When one of the first driving member and the second driving member is driven, it can drive the other to move. The first driving member and the second driving member are respectively arranged at the first end and the second end of the support assembly; the slider assembly is located between the upper support member and the lower support member. The slider assembly includes a first slider in transmission connection with the first driving member and a second slider in transmission connection with the second driving member; the driving assembly is used to be operated to drive the first slider and the second slider to move away from each other or towards each other, so that the upper support member moves relative to the lower support member in the height direction.

[0006] In an embodiment of the present application, when the spinal fusion device is in a to-be-implanted state, that is, in the initial state, the distance between the upper support member and the lower support member in the height direction is the smallest, and the height of the spinal fusion device is the smallest. Thus, the incision size required for implanting the spinal fusion device into the spine is the smallest, which can reduce the implantation difficulty of the spinal fusion device and the difficulty of the bone grafting operation. After the spinal fusion device is implanted into the spine in the initial state, the driving assembly can be controlled to drive the first slider and the second slider to move, so that the upper support member and the lower support member move in a direction away from each other, thereby adjusting the height of the spinal fusion device, making the height of the spinal fusion device adaptable to the intervertebral height to be implanted. After the spinal fusion device is implanted, it can better establish and maintain the lumbar stability. Moreover, the height of the spinal fusion device implanted into the spine can be adjusted in multiple heights according to actual needs, enabling the same-sized spinal fusion device to be applied to different intervertebral heights without increasing the area of the implantation incision, and expanding the applicable range of the spinal fusion device.

[0007] In some embodiments, one side of the upper support member and the lower support member that faces away from each other has a support surface; the first slider has a first driving surface disposed at a first angle with respect to the support surface, the second slider has a second driving surface disposed at a second angle with respect to the support surface, and the first angle is equal to the second angle; on one side of the upper support member facing the lower support member, there is a first mating surface that cooperates with the first driving surface and a second mating surface that cooperates with the second driving surface; the first driving surface and the second driving surface are respectively inclined towards the first end and the second end, or the first driving surface and the second driving surface are respectively inclined away from the first end and the second end; and when the driving assembly is operated to drive the first slider and the second slider to move away from each other or towards each other, the first driving surface slides relative to the first mating surface, the second driving surface slides relative to the second mating surface, and the upper support member moves in the height direction relative to the lower support member.

[0008] In some embodiments, a guiding structure is provided between the mating surfaces of the slider assembly and the upper support member, and the guiding structure includes a guiding groove and a guiding block that are slidably mated.

[0009] In some embodiments, the guiding groove includes a T-shaped groove, the guiding block includes a T-shaped block, or the guiding groove includes a dovetail groove, and the guiding block includes a dovetail block.

[0010] In some embodiments, a plurality of limiting teeth are provided on one side of the first slider and the second slider close to the lower support member, and a plurality of positioning teeth are provided on one side of the lower support member close to the first slider and the second slider; when the first slider and the second slider move away from each other or towards each other, the limiting teeth can slide relative to the positioning teeth; when the first slider and the second slider do not move relative to each other, the limiting teeth and the positioning teeth are engaged and abutted against each other.

[0011] In some embodiments, the limiting teeth include a first limiting surface and a second limiting surface; the positioning teeth include a first positioning surface corresponding to the first limiting surface and a second positioning surface corresponding to the second limiting surface; both the first limiting surface and the first positioning surface form a first angle with the height direction, and both the second limiting surface and the second positioning surface form a second angle with the height direction, and the angle of the first angle is greater than or equal to the angle of the second angle.

[0012] In some embodiments, the first driving member includes a first screw rod and a first nut that are threadedly connected, and the first nut is connected to the first slider; the second driving member includes a second screw rod and a second nut that are threadedly connected, and the second nut is connected to the second slider; the first screw rod is in transmission connection with the second screw rod; when the first screw rod or the second screw rod is operated to rotate about an axis, the first nut and the second nut are driven to move away from or towards each other, and further the first slider and the second slider are driven to move away from or towards each other.

[0013] In some embodiments, a first through hole is provided on the first slider, the first screw rod passes through the first through hole, a first accommodation cavity with an opening facing the lower support member is further provided in the first slider, the first nut is placed in the first accommodation cavity, a second through hole is provided on the second slider, the second screw rod passes through the second through hole, a second accommodation cavity with an opening facing the lower support member is further provided in the second slider, and the second nut is placed in the second accommodation cavity; when the first slider and the second slider move away from or towards each other, the first nut and the second nut are respectively limited in the first accommodation cavity and the second accommodation cavity and slide up and down relative to the first slider and the second slider.

[0014] In some embodiments, the manner in which the first screw rod is in transmission connection with the second screw rod includes one of gear meshing connection, universal joint connection, and flexible shaft connection.

[0015] In some embodiments, the spinal fusion device further includes a limiting block, and the limiting block is located between the first slider and the second slider, and the limiting block is used to limit the first slider and the second slider. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the spinal fusion device in an initial state in an embodiment of the present application;

[0017] Figure 2 is a schematic structural diagram of the spinal fusion device after height adjustment in an embodiment of the present application;

[0018] Figure 3 is an exploded view of the spinal fusion device in an embodiment of the present application;

[0019] Figure 4 is a front view of the spinal fusion device in an embodiment of the present application;

[0020] Figure 5 is a bottom view of the spinal fusion device in an embodiment of the present application;

[0021] Figure 6Partial cross-sectional view of a spinal fusion device in an embodiment of the present application;

[0022] Figure 7 Schematic structural view of a spinal fusion device in another embodiment of the present application;

[0023] Figure 8 Top view of a spinal fusion device in another embodiment of the present application;

[0024] Figure 9 Bottom view of a spinal fusion device in another embodiment of the present application;

[0025] Figure 10 Schematic structural view of a first slider in an embodiment of the present application;

[0026] Figure 11 Another schematic structural view of a first slider in an embodiment of the present application;

[0027] Figure 12 Schematic structural view of a second housing in an embodiment of the present application;

[0028] Figure 13 Partial schematic structural view of a spinal fusion device in an embodiment of the present application;

[0029] Figure 14 Schematic structural view of a second slider in an embodiment of the present application;

[0030] Figure 15 Schematic structural view of a first housing in an embodiment of the present application;

[0031] Figure 16 Partial schematic structural view of a spinal fusion device in an embodiment of the present application;

[0032] Figure 17 Schematic structural view of a first slider in an embodiment of the present application;

[0033] Figure 18 Schematic cross-sectional structural view of a first slider and a first nut after assembly in an embodiment of the present application;

[0034] Figure 19 Schematic structural view of a motion conversion component in an embodiment of the present application;

[0035] Figure 20 Schematic structural view of a motion conversion component and a slider component after assembly in an embodiment of the present application;

[0036] Figure 21 Schematic structural view of a motion conversion component and a first housing after assembly in an embodiment of the present application;

[0037] Figure 22 Schematic diagram of the partial structure of a spinal fusion device in an embodiment of the present application;

[0038] Reference numerals: spinal fusion device - 100, support assembly - 1, lower support member - 11, support surface - 110, positioning teeth - 111, second mounting hole - 112, upper support member - 12, first connecting portion - 121, first mating surface - 1210, second connecting portion - 122, second mating surface - 1220, hollow structure - 13;

[0039] Drive assembly - 2, first drive member - 21, first screw - 211, first rotating portion - 2110, first nut - 212, first bevel gear - 213, second drive member - 22, second screw - 221, second rotating portion - 2210, second nut - 222, second bevel gear - 223;

[0040] Slider assembly - 3, first slider - 31, first drive surface - 311, first through - hole - 312, first receiving cavity - 313, second slider - 32, second drive surface - 321, second through - hole - 322, second receiving cavity - 323, limiting teeth - 33;

[0041] Guide structure - 41, guide groove - 411, guide block - 412;

[0042] Limiting block - 5, fastener - 51, first mounting hole - 52. Detailed implementation manners

[0043] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0045] When describing positional relationships, unless otherwise specified, when an element such as a layer, film, or substrate is referred to as being "on" another element, it can be directly on the other element or there can also be intermediate elements. Further, when a layer is referred to as being "under" another layer, it can be directly below or there can be one or more intermediate elements. It can also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or there can also be one or more intermediate elements.

[0046] In the case of using "comprising", "having", and "including" as described herein, unless explicit limiting terms are used, such as "only", "consisting of", etc., another component can also be added. Unless otherwise mentioned, terms in the singular form can include the plural form and should not be understood as having a quantity of one.

[0047] It should be understood that although terms such as "first", "second", etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first element can be referred to as the second element, and similarly, the second element can be referred to as the first element.

[0048] It should also be understood that when interpreting an element, although not explicitly described, the element is interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximate", or "substantially" can mean within one or more standard deviations, which are not defined herein.

[0049] In addition, in the specification, the phrase "planar distribution schematic diagram" refers to the drawing when observing the target part from above, and the phrase "cross-sectional schematic diagram" refers to the drawing when observing the cross-section intercepted by vertically cutting the target part from the side.

[0050] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are only drawn by way of example in the drawings and not necessarily to the true scale.

[0051] At present, the method used to treat clinical symptoms such as lumbar degenerative spondylolisthesis, segmental instability, and disc-derived diseases is to maintain the height of the intervertebral space by implanting an intervertebral fusion device. The distraction force can keep the muscles and longitudinal ligaments of the fusion segment in a state of continuous tension, so that the fusion segment and the fusion device can achieve three-dimensional hyperstatic fixation. When implanting a spinal fusion device between vertebrae, in order to ensure the smooth implantation of the spinal fusion device, the size of the incision between the vertebrae is usually greater than or equal to the size of the spinal fusion device. However, the space between the vertebrae is limited, and the intervertebral space of some patients will be further reduced due to lesions. In addition, the nerves distributed near the incision will also block the implantation of the spinal fusion device to a certain extent, which greatly limits the size of the spinal fusion device. However, the spinal fusion device needs to have a sufficient height to meet the height requirements of the actual need to expand the spine during treatment, so that the patient's physiological structure can be better restored.

[0052] In the related art, the structure and size of the spinal fusion device are fixed, but the intervertebral height of the human body varies from person to person. During the operation, the height of the spinal fusion device cannot be adjusted to suit the different intervertebral heights of different patients, so the spinal fusion device cannot be fully adapted to the intervertebral height of the human body, which affects the treatment effect. In addition, when the intervertebral space is small, during the process of implanting the spinal fusion device between the patient's spine to restore the spine height, the spinal fusion device needs to be knocked in or the spine needs to be stretched open with other instruments before the spinal fusion device can be placed in the intervertebral incision. Knocking in the spinal fusion device will cause damage to the bones near the incision, and stretching the spine with other instruments will cause additional wounds. The operation is difficult and can easily lead to slow recovery of the patient after surgery, which will also affect the treatment effect.

[0053] Based on the above problems, the present application provides a highly adjustable spinal fusion device, which aims to reduce the difficulty of bone grafting, expand the scope of application of the spinal fusion device, and enable the spinal fusion device to better establish and maintain lumbar stability after implantation.

[0054] The present application embodiment provides a spinal fusion device 100, such as Figures 1 to 6As shown, the spinal fusion device 100 includes a support assembly 1, a drive assembly 2, and a slider assembly 3. The support assembly 1 includes an upper support member 12 and a lower support member 11 that are oppositely arranged in the height direction; in the horizontal direction, the upper support member 12 and the lower support member 11 extend from a first end to a second end; the drive assembly 2 is horizontally arranged between the upper support member 12 and the lower support member 11. The drive assembly 2 includes a first drive member 21 and a second drive member 22 that are in driving connection with each other. When one of the first drive member 21 and the second drive member 22 is driven, it can drive the other to move. The first drive member 21 and the second drive member 22 are respectively arranged at the first end and the second end of the support assembly 1; the slider assembly 3 is located between the upper support member 12 and the lower support member 11. The slider assembly 3 includes a first slider 31 that is in driving connection with the first drive member 21 and a second slider 32 that is in driving connection with the second drive member 22; the drive assembly 2 is used to be operated to drive the first slider 31 and the second slider 32 to move away from each other or towards each other, so that the upper support member 12 moves relative to the lower support member 11 in the height direction.

[0055] In the embodiment of the present application, as Figure 1 shown, when the spinal fusion device 100 is in a state to be implanted, that is, in the initial state, the distance between the upper support member 12 and the lower support member 11 in the height direction is the smallest, and the height of the spinal fusion device 100 is the smallest, so that the incision size required for implanting the spinal fusion device 100 into the spine is the smallest, which can reduce the implantation difficulty of the spinal fusion device 100 and the difficulty of bone grafting surgery. After the spinal fusion device 100 is implanted into the spine in the initial state, the drive assembly 2 can be controlled to drive the first slider 31 and the second slider 32 to move, so that the upper support member 12 and the lower support member 11 move in a direction away from each other, thereby adjusting the height of the spinal fusion device 100, so that the height of the spinal fusion device 100 can be adapted to the intervertebral height to be implanted. After the spinal fusion device 100 is implanted, it can better establish and maintain the lumbar stability. Moreover, the height of the spinal fusion device 100 implanted into the spine can be adjusted in multiple heights according to actual needs, so that the spinal fusion device 100 of the same size can be applied to different intervertebral heights without increasing the area of the implantation incision, which can expand the application range of the spinal fusion device 100.

[0056] In the embodiment of the present application, as Figure 3As shown in Figure 4, by moving either the first driving member 21 or the second driving member 22, the height adjustment of the spinal fusion device 100 can be achieved. The first driving member 21 and the second driving member 22 are respectively arranged on both sides of the spinal fusion device 100. After the spinal fusion device 100 is implanted into the spine, at least a part of a certain side surface of the spinal fusion device 100 must be exposed through an incision. The first driving member 21 and the second driving member 22 can adjust the height of the spinal fusion device 100 regardless of the direction in which the spinal fusion device 100 is implanted, reducing the implantation difficulty of the spinal fusion device 100. In one example, when the intervertebral heights on both sides of the patient are different, the spinal fusion device 100 can be implanted from the side with a larger intervertebral height, further reducing the implantation difficulty of the spinal fusion device 100.

[0057] In the embodiment of the present application, as Figure 4 shown, the first driving member 21 and the second driving member 22 can have different movement directions and amounts of movement, enabling the spinal fusion device 100 to have multiple adjustable heights, facilitating adjustment by doctors during the operation. The height of the spinal fusion device 100 provided by the present application can be adjusted in grades. For example, the height adjustment of the spinal fusion device 100 can be divided into five grades, and the height of each grade increases by 1 mm compared to the previous grade. When the spinal fusion device 100 is at the fifth-grade height, the height of the spinal fusion device 100 can be extended by 5 mm compared to the initial state, expanding the applicable range of the spinal fusion device 100. Optionally, the height adjustment of the spinal fusion device 100 can also be divided into three grades, seven grades, etc., and the height of each grade can increase by 1.5 mm or 0.5 mm compared to the previous grade, which can be set according to actual needs, and the present application does not limit this.

[0058] In the embodiment of the present application, the material of the spinal fusion device 100 includes but is not limited to titanium alloy and PEEK (polyetheretherketone) materials. The PEEK material is a light high-strength material with good biocompatibility, high mechanical strength, and easy processing, which can make the spinal fusion device 100 have excellent performance and be convenient to prepare.

[0059] In some examples, the implantation methods of the spinal fusion device 100 include vertical placement, inclined placement, and front placement.

[0060] In some embodiments, the implantation method of the spinal fusion device 100 is front placement, that is, the spinal fusion device 100 is placed in the anterior column part of the spine. According to spinal biomechanics, the anterior column part of the spine is used to bear the maximum load, and front placement can make the working performance of the spinal fusion device 100 more stable during use and improve the treatment effect of the spinal fusion device 100.

[0061] In some embodiments, as Figure 4As shown, on the opposite sides of the upper support member 12 and the lower support member 11, there are support surfaces 110; the first slider 31 has a first driving surface 311 disposed at a first included angle with the support surface 110. The first driving surface 311 and the second driving surface 321 are inclined towards the first end and the second end respectively, or the first driving surface 311 and the second driving surface 321 are inclined away from the first end and the second end respectively. And when the driving assembly 2 is operated to drive the first slider 31 and the second slider 32 to move away from each other or towards each other, the first driving surface 311 slides relative to the first mating surface 1210, the second driving surface 321 slides relative to the second mating surface 1220, and the upper support member 12 moves relative to the lower support member 11 in the height direction.

[0062] In the embodiment of the present application, as Figure 1 shown, when the spinal fusion device 100 is in the to-be-implanted state, that is, in the initial state, the abutting area between the first driving surface 311 and the first mating surface 1210 is the largest, the abutting area between the second driving surface 321 and the second mating surface 1220 is the largest, the upper support member 12 and the slider assembly 3 are in close contact, and the distance between the lower support member 11 and the upper support member 12 is the smallest, so that the height of the spinal fusion device 100 is the smallest, thereby minimizing the incision size required for implanting the spinal fusion device 100, reducing the implantation difficulty of the spinal fusion device 100, and reducing the surgical difficulty.

[0063] In the embodiment of the present application, when the actual height between vertebrae, hereinafter referred to as the intervertebral height, is greater than the height of the spinal fusion device 100 in the initial state, the spinal fusion device 100 can be first implanted into the vertebrae in the initial state, and then either the first driving member 21 or the second driving member 22 is moved, driving the other to move synchronously and in the opposite direction, thereby driving the first slider 31 and the second slider 32 fixedly connected thereto to move synchronously and in the opposite direction. During the movement of the first slider 31 and the second slider 32, the relatively inclined first driving surface 311 and the second driving surface 321 jointly exert pressure on the first mating surface 1210 and the second mating surface 1220 on the upper support member 12, reducing the abutting area between the first driving surface 311 and the first mating surface 1210, and reducing the abutting area between the second driving surface 321 and the second mating surface 1220, causing the upper support member 12 to move away from the lower support member 11 under the action of force, thereby increasing the height of the spinal fusion device 100 in the height direction. As Figure 2 shown, the height of the spinal fusion device 100 can be adapted to the intervertebral height to be implanted, so that after the spinal fusion device 100 is implanted, it can better establish and maintain the lumbar stability. And the height of the spinal fusion device 100 can be limited according to the movement amount of the first driving member 21 and the second driving member 22. The same spinal fusion device 100 can perform multiple height adjustments, enabling the spinal fusion device 100 to be applied to different intervertebral heights and having a larger applicable range.

[0064] In some embodiments, as Figure 4 shown, the first slider 31 and the second slider 32 are symmetrically arranged, and the first driving surface 311 and the second driving surface 321 intersect to form an angle with an opening facing the lower support 11; the first driving member 21 or the second driving member 22 drives the first slider 31 and the second slider 32 to move in a direction away from each other, and the upper support 12 moves along the side away from the lower support 11 under the drive of the first slider 31 and the second slider 32; the first driving member 21 or the second driving member 22 drives the first slider 31 and the second slider 32 to move in a direction close to each other, and the upper support 12 moves along the side close to the lower support 11 under the drive of the first slider 31 and the second slider 32. When the distance between the first slider 31 and the second slider 32 is the smallest, the distance between the upper support 12 and the lower support 11 is the smallest, and the height of the spinal fusion device 100 is the smallest, being in the initial state. The larger the distance between the first slider 31 and the second slider 32, the greater the moving displacement of the upper support 12, the greater the distance between the upper support 12 and the lower support 11, and the higher the height of the spinal fusion device 100, which can be applied to the spine with a larger intervertebral height.

[0065] In the embodiments of the present application, the first slider 31 and the second slider 32 are symmetrically arranged, which is convenient for the first driving member 21 or the second driving member 22 to drive the first slider 31 and the second slider 32 to move synchronously and reversely when moving synchronously and reversely, improving the synchronism of the movement on both sides of the upper support 12, enabling the spinal fusion device 100 to stably adjust its height, making the contact between the spinal fusion device 100 and the upper and lower bony endplates of the vertebra more balanced, and better establishing and maintaining the lumbar stability.

[0066] In some embodiments, the first slider 31 and the second slider 32 are symmetrically arranged, and the first driving surface 311 and the second driving surface 321 intersect to form an angle with an opening facing the upper support 12; the first driving member 21 or the second driving member 22 drives the first slider 31 and the second slider 32 to move in a direction away from each other, and the upper support 12 moves along the side close to the lower support 11 under the drive of the first slider 31 and the second slider 32; the first driving member 21 or the second driving member 22 drives the first slider 31 and the second slider 32 to move in a direction close to each other, and the upper support 12 moves along the side away from the lower support 11 under the drive of the first slider 31 and the second slider 32. When the distance between the first slider 31 and the second slider 32 is the largest, the distance between the upper support 12 and the lower support 11 is the smallest, and the height of the spinal fusion device 100 is the smallest, being in the initial state. The smaller the distance between the first slider 31 and the second slider 32, the greater the moving displacement of the upper support 12, the greater the distance between the upper support 12 and the lower support 11, and the higher the height of the spinal fusion device 100, which can be applied to the spine with a larger intervertebral height.

[0067] In some embodiments, asFigures 7 to 9 As shown, a plurality of hollow structures 13 are provided on the support surface 101 of the lower support member 11 and / or the upper support member 12. The hollow structures 13 can reduce the overall rigidity of the spinal fusion device 100, increase the bone ingrowth ability, prevent vertebral sedimentation, expand the contact surface between the spinal fusion device 100 and the upper and lower bony end plates of the spine, and improve the fusion rate of the spinal fusion device 100, so that after the spinal fusion device 100 is implanted, the lumbar stability can be better established and maintained, and the height adjustment function of the spinal fusion device 100 can be realized, so that the spinal fusion device 100 can adapt to the intervertebral height of different segments, expand the application range of the spinal fusion device 100, and reduce the overall cost of the installation and application of the spinal fusion device 100. Optionally, the lower support member 11 and the upper support member 12 can be prepared by a 3D printing process to further reduce the cost of the installation and application of the spinal fusion device 100.

[0068] In some embodiments, Figures 10 to 13 As shown, the upper support member 12 is provided with a first connection portion 121 and a second connection portion 122 on one side facing the lower support member 11, a first mating surface 1210 mating with the first driving surface 311 is provided on the first connection portion 121, and a second mating surface 1220 mating with the second driving surface 321 is provided on the second connection portion 122. A guide structure 41 is provided between the mating surfaces of the slider assembly 3 and the upper support member 12, and the guide structure 41 includes a guide groove 411 and a guide block 412 for sliding mating.

[0069] In the present application embodiment, Figure 12 and Figure 13 As shown, a guide structure 41 is provided between the first slider 31 and the first connecting portion 121 and between the second slider 32 and the second connecting portion 122. The guide structure 41 includes a guide groove 411 and a guide block 412 that are slidably matched. The guide groove 411 is located on one of the slider assembly 3 and the upper support member 12, and the guide block 412 is located on the other of the slider assembly 3 and the upper support member 12. The connection between the slider assembly 3 and the upper support member 12 is achieved by the clamping of the guide block 412 and the guide groove 411, which can reduce the probability of the slider assembly 3 and the upper support member 12 tilting or shaking during the relative movement, so that the spinal fusion device 100 can be stably adjusted in height. Optionally, the setting positions of the guide block 412 and the guide groove 411 can be set according to actual needs, and this application does not limit this.

[0070] In some embodiments, the guide groove 411 includes a T-shaped groove, the guide block 412 includes a T-shaped block, or Figures 10 to 12As shown, the guiding groove 411 includes a dovetail groove, and the guiding block 412 includes a dovetail block, which can further improve the stability of the engagement between the slider assembly 3 and the upper support member 12, reduce the probability of the slider assembly 3 disengaging from the upper support member 12 during movement, and further improve the stability of the height adjustment of the spinal fusion device 100.

[0071] In some embodiments, as Figures 13 to 18 shown, a plurality of limiting teeth 33 are provided on one side of the first slider 31 and the second slider 32 close to the lower support member 11, and a plurality of positioning teeth 111 are provided on one side of the lower support member 11 close to the first slider 31 and the second slider 32; when the first slider 31 and the second slider 32 move away from or towards each other, the limiting teeth 33 can slide relative to the positioning teeth 111; when the first slider 31 and the second slider 32 do not move relative to each other, the limiting teeth 33 and the positioning teeth 111 engage and abut against each other.

[0072] In the embodiments of the present application, as Figures 13 to 18 shown, the limiting teeth 33 and the positioning teeth 111 are arranged in an alternating manner. When the height adjustment of the spinal fusion device 100 is in place, the self-locking of the spinal fusion device 100 is realized through the abutment or engagement of the limiting teeth 33 and the positioning teeth 111. At this time, the limitation of the slider assembly 3 not only depends on the clamping of the guiding structure 41. The limiting teeth 33 can reduce the probability of problems such as tilting or height reduction of the spinal fusion device 100 caused by loosening movement between the slider assembly 3 and the upper support member 12 due to excessive force or long-term force under the pressure applied by the upper support member 12 to the slider assembly 3, and improve the working stability of the spinal fusion device 100.

[0073] In the embodiments of the present application, as Figure 16 shown, the cross-sectional shapes of the limiting teeth 33 and the positioning teeth 111 in the first plane include one of a triangle, a trapezoid, or an arc shape. The first plane is perpendicular to the support surface 110 and parallel to the linear movement direction of the first slider 31. When a plurality of limiting teeth 33 arranged in an array are provided on the first slider 31 and a plurality of positioning teeth 111 arranged opposite thereto are provided on the lower support member 11, the cross-sectional shapes of the limiting teeth 33 and the positioning teeth 111 in the third plane are serrated, ladder-toothed, or wavy, which can further refine the anti-retreat range of the spinal fusion device 100 and improve the working stability of the spinal fusion device 100.

[0074] In the embodiments of the present application, when the slider assembly 3 is stationary under the influence of the driving assembly 2, the convex region of the limiting teeth 33, such as the corner of a triangle or the vertex region of an arc, is located in the groove region formed between adjacent positioning teeth 111, or the convex region of the positioning teeth 111 is located in the groove region formed between adjacent limiting teeth 33, to achieve anti-loosening and anti-retreat of the slider assembly 3.

[0075] In some embodiments, the limiting teeth 33 include a first limiting surface and a second limiting surface; the positioning teeth 111 include a first positioning surface corresponding to the first limiting surface and a second positioning surface corresponding to the second limiting surface; both the first limiting surface and the first positioning surface form a first included angle with the height direction, both the second limiting surface and the second positioning surface form a second included angle with the height direction, and the angle of the first included angle is greater than or equal to the angle of the second included angle. The first limiting surface and the first positioning surface are the surfaces where the first slider 31 and the second slider 32 slide relative to the lower support member 11 when moving towards each other. When the angle of the first included angle is less than or equal to the angle of the second included angle, it is convenient for the slider assembly 3 to move, and it is also convenient for anti-loosening and anti-retreat after the first slider 31 and the second slider 32 stop moving.

[0076] In some embodiments, as Figures 19 to 22 shown, the first driving member 21 includes a first screw rod 211 and a first nut 212 connected by thread, and the first nut 212 is connected to the first slider 31; the second driving member 22 includes a second screw rod 221 and a second nut 222 connected by thread, and the second nut 222 is connected to the second slider 32; the first screw rod 211 is in transmission connection with the second screw rod 221; when the first screw rod 211 or the second screw rod 221 is operated to rotate around the axis, it drives the first nut 212 and the second nut 222 to move away from each other or towards each other, and further drives the first slider 31 and the second slider 32 to move away from each other or towards each other.

[0077] In the embodiments of the present application, as Figures 19 to 22 shown, the first driving member 21 and the second driving member 22 are symmetrically arranged. The axis of the first screw rod 211 and the axis of the second screw rod 221 may not be collinear. At this time, there is an included angle between the axis of the first screw rod 211 and the axis of the second screw rod 221, and the rotation directions of the first screw rod 211 and the second screw rod 221 are opposite. Thus, when the first screw rod 211 and the second screw rod 221 rotate, the first nut 212 and the second nut 222 can move synchronously in the direction of approaching or separating from each other, thereby driving the first slider 31 connected to the first nut 212 and the second slider 32 connected to the second nut 222 to move synchronously in the direction of approaching or separating from each other, so as to realize the height adjustment of the spinal fusion device 100.

[0078] In some embodiments, the first driving member 21 and the second driving member 22 are symmetrically arranged. The axis of the first screw rod 211 and the axis of the second screw rod 221 can be collinear. The first screw rod 211 and the second screw rod 221 can be connected into an integral structure. At this time, the first screw rod 211 and the second screw rod 221 together form a single screw rod, and two symmetrically arranged threads are provided on one screw rod. The first nut 212 and the second nut 222 are respectively threadedly connected to the two threads. At this time, a transmission mechanism may not be provided between the first screw rod 211 and the second screw rod 221. When the first screw rod 211 and the second screw rod 221 rotate synchronously and in the same direction, they drive the first nut 212 and the second nut 222 to move synchronously in the direction of approaching or separating from each other, thereby driving the first slider 31 connected to the first nut 212 and the second slider 32 connected to the second nut 222 to move synchronously in the direction of approaching or separating from each other, realizing the height adjustment of the spinal fusion device 100.

[0079] In some embodiments, as Figure 17 and Figure 18 shown, a first through hole 312 is provided on the first slider 31, and the first screw rod 211 is passed through the first through hole 312. A first accommodation cavity 313 with an opening facing the lower support member 11 is further provided in the first slider 31, and the first nut 212 is placed in the first accommodation cavity 313; a second through hole 322 is provided on the second slider 32, and the second screw rod 221 is passed through the second through hole 322. A second accommodation cavity 323 with an opening facing the lower support member 11 is further provided in the second slider 32, and the second nut 222 is placed in the second accommodation cavity 323. When the first slider 31 and the second slider 32 move away from each other or move towards each other, the first nut 212 and the second nut 222 are respectively limited in the first accommodation cavity 313 and the second accommodation cavity 323 and slide up and down relative to the first slider 31 and the second slider 32.

[0080] In the embodiments of the present application, as Figure 17 and Figure 18 shown, along the extending direction of the first screw rod 211, the orthographic projection area of the first through hole 312 is smaller than the orthographic projection area of the first nut 212, preventing the first nut 212 from slipping out of the first accommodation cavity 313 during movement and avoiding the connection failure between the first nut 212 and the first slider 31. The first accommodation cavity 313 can enable the first slider 31 to have a certain amount of up and down movement in the height direction during movement, so that the cooperation between the limiting teeth 33 below the first slider 31 and the positioning teeth 111 on the lower support member 11 is an active cooperation, enabling the first slider 31 to move linearly driven by the first nut 212 while being able to move up and down in the height direction, facilitating the anti-loosening and anti-retreat after height adjustment of the first slider 31 and improving the working stability of the spinal fusion device 100.

[0081] In the embodiment of the present application, along the extending direction of the second screw 221, the orthographic projection area of the second through hole 322 is smaller than the orthographic projection area of the second nut 222, preventing the second nut 222 from disengaging from the second receiving cavity 323 during movement, and avoiding the connection failure between the second nut 222 and the second slider 32. The second receiving cavity 323 enables the second slider 32 to have a certain amount of vertical movement in the height direction during movement, so that the cooperation between the limiting teeth 33 below the second slider 32 and the positioning teeth 111 on the lower support member 11 is an active fit. While the second slider 32 moves linearly driven by the second nut 222, it can move up and down in the height direction, facilitating the anti-loosening and anti-retreat of the second slider 32 after height adjustment, and improving the working stability of the spinal fusion device 100.

[0082] In some embodiments, the first driving member 21 and the second driving member 22 are ball screw mechanisms. The first driving member 21 includes a first screw and a first nut. A first bevel gear is provided on one side of the first screw close to the second driving member 22, and the first nut is connected to the first slider 31. Spiral grooves are provided on the sides of the first screw and the first nut close to each other, and the spiral groove on the first screw and the spiral groove on the first nut are connected to form a spiral raceway. A plurality of balls are provided in the spiral raceway. The second driving member 22 includes a second screw and a second nut. A second bevel gear is provided on one side of the second screw close to the first screw, and the first bevel gear is meshed and connected to the second bevel gear. The second nut is connected to the second slider 32. Spiral grooves are provided on the sides of the second screw and the second nut close to each other, and the spiral groove on the second screw and the spiral groove on the second nut are connected to form a spiral raceway. A plurality of balls are provided in the spiral raceway. The first driving member 21 and the second driving member 22 are symmetrically arranged, and the extending direction of the first screw intersects with the extending direction of the second screw.

[0083] In some embodiments, the way of driving connection between the first screw 211 and the second screw 221 includes one of gear meshing connection, universal joint connection, and flexible shaft connection.

[0084] In the embodiment of the present application, as Figure 19As shown in the figure, on one side of the first screw rod 211 close to the second driving member 22, a first bevel gear 213 is provided. On one side of the second screw rod 221 close to the first screw rod 211, a second bevel gear 223 is provided. The first screw rod 211 and the second screw rod 221 are meshed and connected through the first bevel gear 213 and the second bevel gear 223, so as to realize that when the first screw rod 211 rotates, it drives the second screw rod 221 to rotate synchronously and in the opposite direction, or when the second screw rod 221 rotates, it drives the first screw rod 211 to rotate synchronously and in the opposite direction. Among them, the first bevel gear 213 and the second bevel gear 223 can be driven in equal proportion, and the transmission ratio is 1. At this time, the number of teeth of the first bevel gear 213 and the second bevel gear 223 is equal, so that the first screw rod 211 and the second screw rod 221 are driven in equal proportion and the transmission ratio is accurate, so as to ensure the synchronism of the rotation of the first screw rod 211 and the second screw rod 221, and further ensure the synchronism of the movement of the first nut 212 and the second nut 222 on the first screw rod 211 and the second screw rod 221, ensure the synchronism of the movement of the first slider 31 and the second slider 32, and improve the accuracy of the height adjustment of the spinal fusion device 100 and the stability during the height adjustment process.

[0085] In some embodiments, as Figures 19 to 22 shown, on one side of the first screw rod 211 away from the first bevel gear 213, a first rotating part 2110 is provided, which is convenient for the doctor to drive the first screw rod 211 to rotate. Correspondingly, on one side of the second screw rod 221 away from the second bevel gear 223, a second rotating part 2210 is provided, which is convenient for the doctor to drive the second screw rod 221 to rotate. The first rotating part 2110 and the second rotating part 2210 can be in the shape of a straight line, a cross, a triangle or a rectangle, etc. The shapes of the first rotating part 2110 and the second rotating part 2210 can be set according to actual needs, and the present application does not limit this.

[0086] In some embodiments, as Figure 3 and Figure 22 shown, the spinal fusion device 100 further includes a limiting block 5. The limiting block 5 is located between the first slider 31 and the second slider 32, and the limiting block 5 is used to limit the first slider 31 and the second slider 32.

[0087] In the embodiments of the present application, as Figure 3 and Figure 22 shown, the limiting block 5 is connected to the lower support member 11. The limiting block 5 is used to limit the minimum distance between the first slider 31 and the second slider 32, so as to limit the adjustment height of the spinal fusion device 100. Correspondingly, the lower support member 11 can limit the maximum distance between the first slider 31 and the second slider 32. And the limiting block 5 covers the first bevel gear 213 and the second bevel gear 223, which can reduce the influence of other structures of the spinal fusion device 100 on the meshing of the first bevel gear 213 and the second bevel gear 223, and improve the smoothness and reliability of the transmission between the first bevel gear 213 and the second bevel gear 223.

[0088] In the embodiments of the present application, as Figure 15 shown, a groove for accommodating and fixing the first screw rod 211, the second screw rod 221, the first bevel gear 213 and the second bevel gear 223 is further provided inside the lower support member 11; as Figure 3 shown, a groove for accommodating and fixing the first screw rod 211, the second screw rod 221, the first bevel gear 213 and the second bevel gear 223 is also provided inside the limiting member close to the lower support member 11, preventing the first screw rod 211, the second screw rod 221, the first bevel gear 213 and the second bevel gear 223 from moving other than rotating, and improving the working stability of the spinal fusion device 100. The grooves on the lower support member 11 and the limiting member can be arc-shaped grooves or other grooves, corresponding to the outer contours of the first screw rod 211, the second screw rod 221, the first bevel gear 213 and the second bevel gear 223. As Figure 3 shown, the spinal fusion device 100 further includes a fastener 51 for connecting the lower support member 11 and the limiting block 5. The fastener 51 includes, but is not limited to, threaded fasteners such as screws and bolts. Correspondingly, a first mounting hole 52 for mounting the fastener 51 is provided on the limiting block 5, and a second mounting hole 112 for mounting the fastener 51 is provided at the middle position of the lower support member 11.

[0089] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0090] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A spinal fusion device, characterized in that, It includes a support component, a drive component, and a slider component. The support component includes an upper support member and a lower support member that are oppositely arranged in the height direction; in the horizontal direction, the upper support member and the lower support member extend from a first end to a second end; the drive component is horizontally arranged between the upper support member and the lower support member. The drive component includes a first drive member and a second drive member that are drivingly connected to each other. When one of the first drive member and the second drive member is driven, it can drive the other to move. The first drive member and the second drive member are respectively arranged at the first end and the second end of the support component; the slider component is located between the upper support member and the lower support member. The slider component includes a first slider drivingly connected to the first drive member and a second slider drivingly connected to the second drive member; the drive component is used to be operated to drive the first slider and the second slider to move away from each other or towards each other, so that the upper support member moves relative to the lower support member in the height direction.

2. The spinal fusion device according to claim 1, characterized in that, On the opposite sides of the upper support member and the lower support member, there are support surfaces. The first slider has a first drive surface arranged at a first angle with the support surface, and the second slider has a second drive surface arranged at a second angle with the support surface. The first angle is equal to the second angle. On the side of the upper support member facing the lower support member, there is a first mating surface that cooperates with the first drive surface and a second mating surface that cooperates with the second drive surface. The first drive surface and the second drive surface are respectively inclined towards the first end and the second end, or the first drive surface and the second drive surface are respectively inclined away from the first end and the second end. When the drive component is operated to drive the first slider and the second slider to move away from each other or towards each other, the first drive surface slides relative to the first mating surface, the second drive surface slides relative to the second mating surface, and the upper support member moves relative to the lower support member in the height direction.

3. The spinal fusion device according to claim 2, wherein, A guiding structure is arranged between the mating surfaces of the slider component and the upper support member. The guiding structure includes a guiding groove and a guiding block that are in sliding fit.

4. The spinal fusion device according to claim 3, characterized in that, The guiding groove includes a T-shaped groove, and the guiding block includes a T-shaped block, or the guiding groove includes a dovetail groove, and the guiding block includes a dovetail block.

5. The spinal fusion device according to claim 1, characterized in that, On the side of the first slider and the second slider close to the lower support member, there are a plurality of limiting teeth arranged, and on the side of the lower support member close to the first slider and the second slider, there are a plurality of positioning teeth arranged. When the first slider and the second slider move away from each other or towards each other, the limiting teeth can slide relative to the positioning teeth; when the first slider and the second slider do not move relative to each other, the limiting teeth and the positioning teeth are engaged and abutted against each other.

6. The spinal fusion device according to claim 5, characterized in that, The limiting teeth include a first limiting surface and a second limiting surface; the positioning teeth include a first positioning surface corresponding to the first limiting surface and a second positioning surface corresponding to the second limiting surface; both the first limiting surface and the first positioning surface form a first included angle with the height direction, both the second limiting surface and the second positioning surface form a second included angle with the height direction, and the angle of the first included angle is greater than or equal to the angle of the second included angle.

7. The spinal fusion device according to claim 1, characterized in that, The first driving member includes a first screw rod and a first nut connected by thread, and the first nut is connected to the first slider; the second driving member includes a second screw rod and a second nut connected by thread, and the second nut is connected to the second slider; the first screw rod is in transmission connection with the second screw rod; When the first screw rod or the second screw rod is operated to rotate around the axis, it drives the first nut and the second nut to move away from each other or move towards each other, and further drives the first slider and the second slider to move away from each other or move towards each other.

8. The spinal fusion device according to claim 7, wherein, A first through hole is provided on the first slider, the first screw rod passes through the first through hole, and a first accommodating cavity with an opening facing the lower support member is further provided in the first slider, and the first nut is placed in the first accommodating cavity; a second through hole is provided on the second slider, the second screw rod passes through the second through hole, and a second accommodating cavity with an opening facing the lower support member is further provided in the second slider, and the second nut is placed in the second accommodating cavity; when the first slider and the second slider move away from each other or move towards each other, the first nut and the second nut are respectively limited in the first accommodating cavity and the second accommodating cavity and slide up and down relative to the first slider and the second slider.

9. The spinal fusion device according to claim 7, characterized in that, The way that the first screw rod is in transmission connection with the second screw rod includes one of gear meshing connection, universal joint connection and flexible shaft connection.

10. The spinal fusion device according to claim 1, characterized in that, The spinal fusion device further includes a limiting block, the limiting block is located between the first slider and the second slider, and the limiting block is used for limiting the first slider and the second slider.

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