Intervertebral fusion cage

Abstract

The present invention discloses an intervertebral fusion device, including a fusion device body, a limiting component and a connecting component. The fusion device body is provided with a bone graft cavity, the bone graft cavity is connected to the outside along the up and down direction, the connecting component is used to fix the limiting component in the bone graft cavity, the limiting component has a first locking plate and a second locking plate, the limiting component can be deformed, the first locking plate can extend upward from the bone graft cavity, and the second locking plate can extend downward from the bone graft cavity. The intervertebral fusion device only needs to be inserted into the intervertebral space once so that the limiting component can penetrate the upper and lower vertebral bodies, which can reduce the steps of surgical operation and is easy to operate. The setting of the limiting component can effectively improve the problem of the intervertebral fusion device withdrawing from the intervertebral disc, has an anti-retrogression function, and reduces the surgical risk of the patient.

Description

Technical Field

[0001] The invention is used in the field of medical devices, and particularly relates to an intervertebral fusion device. Background Art

[0002] Intervertebral bone graft fusion is to connect or fuse two or more adjacent vertebrae together to achieve the purpose of restoring spinal stability. This fusion surgery usually requires placing an intervertebral fusion cage filled with bone tissue or artificial bone in the vertebral discs of two adjacent vertebrae so that they are "fused" together to replace the nucleus pulposus and cartilage tissue in the intervertebral disc that were completely / partially removed during surgery for treatment needs.

[0003] At present, there are three main types of intervertebral fusion devices on the market. The first type is used in conjunction with internal fixation screws. The doctor acts as the operator, and the operation time is long and the workload is large. The patient needs to bear the surgical and consumable costs of both the internal fixation screws and the intervertebral fusion device. The second type is an expandable intervertebral fusion device. Most expandable intervertebral fusion devices are made of titanium alloy. The anti-retraction teeth on the upper and lower surfaces that contact the vertebral body prevent the fusion device from withdrawing from the intervertebral disc. The titanium alloy fusion device is harder than the vertebral body and can easily cause vertebral collapse. As the patient ages and the ligaments and muscles become soft, the effect of the anti-retraction teeth will weaken, and there is a risk of dislocation. The third type is a fusion device with inserts or screws. For patients with loose bones, the fixation of the inserts and screws is not reliable, and the implantation of the fusion device, inserts and screws needs to be divided into multiple implants, which has many steps and is difficult to use. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an intervertebral fusion device that can reduce the steps of surgical operation, is easy to operate, has an anti-retrogression function, effectively improves the problem of the intervertebral fusion device withdrawing from the intervertebral disc space, and reduces the surgical risk of patients.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] An intervertebral fusion device comprises a fusion device body, a limiting component and a connecting component. The fusion device body is provided with a bone graft cavity, and the bone graft cavity is connected to the outside along the up and down directions. The connecting component is used to fix the limiting component in the bone graft cavity. The limiting component has a first locking plate and a second locking plate. The limiting component can be deformed. The first locking plate can extend upward from the bone graft cavity, and the second locking plate can extend downward from the bone graft cavity.

[0007] In combination with the above-mentioned implementation manner, in certain implementation manners of the present invention, the connecting component has a stepped structure, the rear end of the fusion device body is provided with a first connecting hole, and the front end of the fusion device body is provided with a second connecting hole, the first connecting hole and the second connecting hole are both connected to the bone grafting cavity, the limiting component has a fixing seat connected to the first locking plate and the second locking plate, and the fixing seat is provided with a third connecting hole, the connecting component passes through the first connecting hole and the third connecting hole in sequence and then extends into the second connecting hole, the stepped structure resists the rear end of the fixing seat and fixes the limiting component to the fusion device body.

[0008] In combination with the above implementations, in certain implementations of the present invention, the limiting component is elastic, the limiting component can be buried in the bone graft cavity in a compressed state, and the limiting component can extend out of the bone graft cavity in a natural state.

[0009] In combination with the above-mentioned implementation methods, in certain implementation methods of the present invention, the limiting component is elastic, and the limiting component can be buried in the bone graft cavity in a natural state. The connecting component is provided with a support component, and the support component supports the first locking plate and the second locking plate to extend the first locking plate upward from the bone graft cavity and the second locking plate can extend downward from the bone graft cavity.

[0010] In combination with the above implementation, in certain implementations of the present invention, the second connecting hole and the third connecting hole are both circular holes, the front end of the connecting component cooperates with the circular hole, the first connecting hole is an internal threaded hole, the rear end of the connecting component cooperates with the internal threaded hole, and the rear end of the connecting component is provided with an adjustment groove.

[0011] In combination with the above implementations, in certain implementations of the present invention, the fusion device body is provided with a threaded clamping hole at the rear end of the first connecting hole, and the fusion device body is provided with clamping grooves on both sides of the threaded clamping hole.

[0012] In combination with the above implementations, in certain implementations of the present invention, both the first locking piece and the second locking piece have a pointed end.

[0013] In combination with the above implementations, in certain implementations of the present invention, a developing hole is provided on the fusion device body, and a developing wire is provided in the developing hole.

[0014] In combination with the above implementations, in certain implementations of the present invention, anti-retraction teeth are provided on the top and bottom of the fusion device body, and the front end of the fusion device body is tapered.

[0015] In combination with the above implementations, in certain implementations of the present invention, the limiting component, the fusion device body and the connecting component are all made of titanium alloy or polyetheretherketone material.

[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: when performing intervertebral bone grafting surgery on a patient, the limiting component is fixed in the bone graft cavity, and then the intervertebral fusion device is delivered into the intervertebral disc through a clamping device. During the implantation of the intervertebral fusion device, the limiting component is buried in the bone graft cavity, and the intervertebral fusion device is in a passable state. After the intervertebral fusion device is placed in place, the limiting component extends out of the bone graft cavity, and the intervertebral fusion device is in an anti-retrogression state. The intervertebral fusion device of this technical solution only needs to be inserted into the intervertebral disc once so that the limiting component can penetrate the upper and lower vertebral bodies, which can reduce the steps of surgical operation and is easy to operate. The setting of the limiting component can effectively improve the problem of the intervertebral fusion device withdrawing from the intervertebral disc, has an anti-retrogression function, and reduces the surgical risk of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] Figure 1 is a schematic diagram of the structure of an embodiment of the present invention in a decomposed state;

[0019] Figure 2 yes Figure 1 A cross-sectional view of a limiting component of an embodiment shown in a compressed state;

[0020] Figure 3 yes Figure 1 A cross-sectional view of a limiting component in a natural state of an embodiment is shown;

[0021] Figure 4 yes Figure 1 A cross-sectional view of a fusion device body according to an embodiment of the present invention;

[0022] Figure 5 yes Figure 1 A schematic structural diagram of a position limiting component according to an embodiment is shown;

[0023] Figure 6 is a schematic structural diagram of another embodiment of the present invention in a decomposed state;

[0024] Figure 7 yes Figure 6 A cross-sectional view of a limiting component in a natural state of an embodiment is shown;

[0025] Figure 8 yes Figure 6 A cross-sectional view of a limiting component of an embodiment is shown in an expanded state. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0027] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0028] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0030] Fusion surgery usually requires placing an intervertebral fusion cage filled with bone tissue or artificial bone in the vertebral discs of two adjacent vertebrae to "fuse" them together, replacing the nucleus pulposus and cartilage tissue in the intervertebral disc that were completely or partially removed during surgery for treatment purposes, restoring the normal physiological height of the intervertebral disc, and reducing or eliminating compression or stimulation of the nerves. Figure 1 and Figure 6 The embodiment of the present invention provides an intervertebral fusion device, including a fusion device body 1, a limiting component 2 and a connecting component 3. The fusion device body 1 is provided with a bone graft cavity 11, and the bone graft cavity 11 is used to hold bone tissue or artificial bone, and the bone graft cavity 11 is connected to the outside in the up-down direction. The connecting component 3 is used to fix the limiting component in the bone graft cavity 11. The limiting component 2 has a first locking piece 21 and a second locking piece 22. The limiting component 2 can be deformed so that the first locking piece 21 can extend upward from the bone graft cavity 11, and the second locking piece 22 can extend downward from the bone graft cavity 11, thereby piercing into the upper and lower vertebral bodies, and has an anti-retrogression function.

[0031] When performing intervertebral bone grafting surgery on a patient, the limiting component 2 is fixed in the bone graft cavity 11, and the intervertebral fusion device is then inserted into the intervertebral disc through a clamping device. During the implantation of the intervertebral fusion device, the limiting component 2 is embedded in the bone graft cavity 11, and the intervertebral fusion device is in a passable state. Figure 2 and Figure 7 After the intervertebral fusion cage is placed in place, the limiting component 2 extends out of the bone graft cavity 11, and the intervertebral fusion cage is in an anti-retrogression state. Figure 3 and Figure 8 The intervertebral fusion device of this technical solution only needs to be inserted into the intervertebral disc once so that the limiting component 2 can penetrate the vertebral body, which reduces the steps of surgical operation and is easy to operate. The setting of the limiting component 2 can effectively improve the problem of the intervertebral fusion device withdrawing from the intervertebral disc, has an anti-retrogression function, and reduces the surgical risk of patients.

[0032] See also Figures 1 to 3 , Figures 6 to 8 In some embodiments, the connecting component 3 has a stepped structure, the rear end of the fusion device body 1 is provided with a first connecting hole 12, the front end of the fusion device body 1 is provided with a second connecting hole 13, the first connecting hole 12 and the second connecting hole 13 are both connected to the bone graft cavity 11, the limiting component 2 has a fixing seat 23 connected to the first locking plate 21 and the second locking plate 22, the fixing seat 23 is provided with a third connecting hole 24, the connecting component 3 passes through the first connecting hole 12 and the third connecting hole 24 in sequence and then extends into the second connecting hole 13, the stepped structure abuts against the rear end of the fixing seat 23, and fixes the limiting component 2 to the fusion device body 1. The stepped structure is conducive to abutting against the fixing seat 23, so as to fix the limiting component 2 in the bone graft cavity 11. It can be understood that the stepped structure can be in the form of a stepped shaft, or a bump can be provided on the connecting component 3 or an outer tube can be connected by a threaded connection, etc., to abut against the fixing seat 23.

[0033] The first connection hole 12 and the rear end of the connection component 3 can be connected by threading or snap-fitting. Figure 2 , Figure 3 , Figure 7 and Figure 8 In some embodiments, the second connection hole 13 and the third connection hole 24 are both round holes, the front end of the connection component 3 cooperates with the round hole, and the step structure is used to support the fixing seat 23, the first connection hole 12 is an internal thread hole, and the rear end of the connection component 3 cooperates with the internal thread hole, which is convenient for installing and fixing the limiting component 2, and the operation is simple. The rear end of the connection component 3 is provided with an adjustment slot 31, which is convenient for adjusting the connection component 3 to adjust the relative position of the connection component 3 and the limiting component 2, and is convenient for use.

[0034] The first locking piece 21 and the second locking piece 22 can be automatically unfolded under the elastic action to extend out of the bone graft cavity 11, or can be extended out of the bone graft cavity 11 under the expansion action of the expansion component. Figures 1 to 3 In some embodiments, the limiting component 2 is elastic, and the limiting component 2 can be embedded in the bone graft cavity 11 in a compressed state, and the limiting component 2 can extend out of the bone graft cavity 11 in a natural state. Figure 2 , the limiting component 2 is in a compressed state and embedded in the bone graft cavity 11, so that the intervertebral fusion cage can pass through the intervertebral disc; after the intervertebral fusion cage is placed in place, see Figure 3 The limiting component 2 automatically expands and returns to a natural state under the action of elasticity, and then extends out of the bone graft cavity 11. Specifically, the first locking piece 21 can extend upward from the bone graft cavity 11, and the second locking piece 22 can extend downward from the bone graft cavity 11, thereby respectively piercing into the vertebral body, playing an anti-retrogression role, effectively improving the problem of the intervertebral fusion device withdrawing from the intervertebral disc, and the operation is simple.

[0035] See also Figures 6 to 8 In other embodiments, the limiting component 2 is elastic and can be buried in the bone graft cavity 11 in a natural state. The connecting component 3 is provided with a spreading component 4, and the spreading component 4 spreads the first locking piece 21 and the second locking piece 22, so that the first locking piece 21 can extend upward from the bone graft cavity 11, and the second locking piece 22 can extend downward from the bone graft cavity 11. In the process of implanting the intervertebral fusion cage, see Figure 7 , the limiting component 2 is in a natural state and buried in the bone graft cavity 11, so that the intervertebral fusion cage can pass through the intervertebral disc; after the intervertebral fusion cage is placed in place, see Figure 8 The connecting component 3 is squeezed forward, and the first locking piece 21 and the second locking piece 22 are spread apart by the spreading component 4, so that the first locking piece 21 can extend upward out of the bone graft cavity 11, and the second locking piece 22 can extend downward out of the bone graft cavity 11, thereby respectively piercing the upper and lower vertebral bodies, playing an anti-retrogression role, effectively improving the problem of the intervertebral fusion device withdrawing from the intervertebral disc, and the operation is simple.

[0036] See also Figure 2 , Figure 3 , Figure 5 , Figure 7 and Figure 8 In some embodiments, the first locking plate 21 and the second locking plate 22 both have a tip 25. When the first locking plate 21 and the second locking plate 22 extend out of the bone graft cavity 11, the tip 25 penetrates into the vertebral body, thereby playing a good anti-exit function, preventing the intervertebral fusion device from exiting the intervertebral disc, and reducing the surgical risk of the patient.

[0037] See also Figures 1 to 3 , Figures 6 to 8In some embodiments, the top and bottom of the fusion device body 1 are provided with anti-retraction teeth 14, which together with the limiting component 2 play a dual anti-retraction role, greatly reducing the probability of the fusion device withdrawing from the intervertebral disc and reducing medical safety hazards. The front end of the fusion device body 1 is conical, and the conical design is conducive to inserting the fusion device body 1 into the intervertebral disc, which conforms to the laws of mechanics. It is understandable that the shape and size of the fusion device body 1 can be set according to the needs of the operation.

[0038] Fusion surgery requires the intervertebral fusion cage to be clamped by a clamping tool and then inserted into the intervertebral disc. Figures 1 to 4 , Figures 6 to 8 In some embodiments, the fusion device body 1 is provided with a threaded clamping hole 15 at the rear end of the first connecting hole 12, and the fusion device body 1 is provided with clamping grooves 16 on both sides of the threaded clamping hole 15. The clamping tool clamps the fusion device body 1 through the threaded clamping hole 15 and the clamping groove 16 to facilitate the smooth progress of the operation, which is practical.

[0039] See also Figure 4 In some embodiments, a developing hole 17 is provided on the fusion device body 1, and a developing wire is provided in the developing hole 17. When the intervertebral fusion device is placed into the intervertebral disc, the position of the developing wire can be observed by taking a CT scan, so as to quickly determine the specific position of the intervertebral fusion device and judge whether the intervertebral fusion device is in place, thereby ensuring the smooth progress of the operation.

[0040] In some embodiments, the limiting component 2, the fusion device body 1 and the connecting component 3 are all made of titanium alloy or polyetheretherketone materials. Titanium alloy and polyetheretherketone materials have good biocompatibility, are suitable for intervertebral fusion surgery, and can effectively avoid rejection. At the same time, titanium alloy or polyetheretherketone materials are elastic, which is convenient for insertion into the intervertebral space during surgery, and after the intervertebral fusion device is placed in place, it will deform and penetrate the upper and lower vertebral bodies, which has an excellent anti-retrogression function and reduces the surgical risk of patients.

[0041] In the description of this specification, the description with reference to the terms "example", "embodiment" or "some embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An intervertebral fusion cage, Features: The invention comprises a fusion device body, a limiting component and a connecting component, wherein the fusion device body is provided with a bone graft cavity, the bone graft cavity is communicated with the outside along the up-down direction, the connecting component is used to fix the limiting component in the bone graft cavity, the limiting component has a first locking plate and a second locking plate, the limiting component can be deformed, the first locking plate can extend upward from the bone graft cavity, the second locking plate can extend downward from the bone graft cavity, the connecting component has a stepped structure, the rear end of the fusion device body is provided with a first connecting hole, the front end of the fusion device body is provided with a second connecting hole, the first connecting hole and the second connecting hole are both communicated with the bone graft cavity, the limiting component has a fixing seat connected with the first locking plate and the second locking plate, A third connecting hole is provided on the fixing seat, and the connecting component passes through the first connecting hole and the third connecting hole in sequence and then extends into the second connecting hole. The stepped structure resists the rear end of the fixing seat and fixes the limiting component to the fusion device body. The fusion device body is provided with a threaded clamping hole at the rear end of the first connecting hole, and the fusion device body is provided with clamping grooves on both sides of the threaded clamping hole. The limiting component is elastic and can be buried in the bone graft cavity in a natural state. An opening component is provided on the connecting component, and the opening component opens the first locking plate and the second locking plate so that the first locking plate can be extended upward from the bone graft cavity and the second locking plate can be extended downward from the bone graft cavity.

2. The intervertebral fusion cage according to claim 1, Features: The second connecting hole and the third connecting hole are both circular holes, the front end of the connecting component cooperates with the circular hole, the first connecting hole is an internal threaded hole, the rear end of the connecting component cooperates with the internal threaded hole, and the rear end of the connecting component is provided with an adjustment groove.

3. The intervertebral fusion cage according to claim 1, Features: The first locking piece and the second locking piece both have a pointed end.

4. The intervertebral fusion cage according to claim 1, Features: The fusion device body is provided with a developing hole, and a developing wire is provided in the developing hole.

5. The intervertebral fusion cage according to claim 1, Features: The top and bottom of the fusion device body are both provided with anti-retraction teeth, and the front end of the fusion device body is tapered.

6. The intervertebral fusion cage according to claim 1, Features: The limiting component, the fusion device body and the connecting component are all made of titanium alloy or polyetheretherketone material.

Images