Distraction interbody fusion cage with coating
By using titanium or hydroxyapatite coatings and microtextured surfaces on the intervertebral fusion device, the bioincompatibility and hydrophobicity of traditional intervertebral fusion device materials are solved, and better implantation performance and lumbar fusion effect are achieved.
Patent Information
- Application Number
- CN202420270465.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-02-04
AI Technical Summary
Traditional intervertebral fusion devices are biologically incompatible and highly hydrophobic, resulting in unsatisfactory fusion effect before implantation, long operation time and the secondary bone grafting cannot be performed, and the surface of the vertebral body cannot be fitted in the open state, affecting the effect of lumbar fusion.
A coating-protectable intervertebral fusion device is designed, the body of the fusion device is made of polyether ether ketone material, the end plate and final cover are made of titanium alloy material, and the surface is sprayed with pure titanium or hydroxyapatite coating. The micro-textured surface and micropore group are set to improve adhesion and penetration depth, and a smooth transition arc surface is set at the anti-dentifrip and secondary bone graft windows to achieve bone graft fusion before and after the expansion is opened.
It avoids unsatisfactory fusion caused by direct contact on the surface of the vertebral body, shortens the operating time, ensures sufficient bone grafting and fitting effect, and promotes lumbar fusion.
Smart Images
Figure CN222172379U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of intervertebral fusion devices, in particular to an expandable intervertebral fusion device with a coating. Background Art
[0002] Minimally invasive spinal surgery has become the main trend in the treatment of lumbar diseases. Traditional intervertebral fusion devices are difficult to meet the needs of minimally invasive surgery, and the current fusion devices are highly fixed and cannot meet the requirements of the original physiological curvature of the spine, which increases the limitations of the use of fusion devices.
[0003] Therefore, expandable intervertebral fusion devices were developed and applied in clinical practice. This type of fusion device is implanted in the intervertebral space in a contracted state and expanded in situ to increase the contact area with the end plate and restore the lordotic curvature. It has strong biomechanical stability and is suitable for various lumbar degenerative diseases that require intervertebral fusion, and can achieve satisfactory clinical results.
[0004] The conventional expandable intervertebral fusion device with polyetheretherketone (PEEK) as the main material in the prior art has the disadvantages of PEEK-type fusion device products: biological inertness and hydrophobicity, which make the fusion effect of the product in the early stage of implantation unsatisfactory.
[0005] There are also problems such as the operation time being too long, the inability to perform secondary bone grafting, and the inability to fit the vertebral surface well in the distracted state, resulting in the inability to promote lumbar fusion. Utility Model Content
[0006] The purpose of the utility model is to provide a coated expandable intervertebral fusion device in response to the defects in the prior art, so that the fusion device can avoid the unsatisfactory fusion caused by direct contact of PEEK products with the vertebral surface. At the same time, the device has a simple structure, which can minimize the operation time and can perform bone grafting and fusion twice before and after expansion, fully ensuring the amount of bone grafting and better fitting the vertebral surface in the expanded state, thereby promoting the effect of lumbar fusion.
[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a coated expandable intervertebral fusion device, comprising a fusion device body, an end plate and an end cover; the end plate and the end cover are arranged on both sides of the inside of the fusion device body; the fusion device body is provided with an anti-tooth dislocation and a bone grafting window; the surface of the fusion device body is sprayed with a coating.
[0008] Furthermore, a micro-textured surface is provided on the surface of the fusion device body that needs to be sprayed, and the micro-textured surface improves the adhesion of the coating.
[0009] Furthermore, a micropore group is also arranged on the microtextured surface, and the micropore group increases the penetration depth of the coating.
[0010] Furthermore, the edge between the fusion device body and the anti-slip teeth is provided with a uniform and smooth transition arc surface.
[0011] Furthermore, a secondary bone grafting window is also provided on the fusion device body.
[0012] Furthermore, the coating is sprayed only on the surface of the fusion device body other than the secondary bone grafting window.
[0013] Furthermore, the fusion device body is made of polyetheretherketone material, and the end plate and the end cover are made of titanium alloy material.
[0014] Furthermore, the coating is a pure titanium coating or a hydroxyapatite coating or a pure titanium+hydroxyapatite double coating.
[0015] The fusion device comprises a fusion device body, an end plate and an end cover; the end plate and the end cover are respectively arranged on both sides of the fusion device body; the fusion device body is provided with an anti-tooth dislocation window and a bone grafting window; the surface of the fusion device body is sprayed with a coating structure, so that the fusion device can avoid unsatisfactory fusion caused by direct contact of PEEK products with the vertebral surface. At the same time, the fusion device has a simple structure, which can minimize the operation time, and can perform bone grafting fusion twice before and after expansion, which fully guarantees the amount of bone grafting and can better fit the vertebral surface in the expanded state, thereby promoting the effect of lumbar fusion. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 It is a schematic diagram of a coated expandable intervertebral fusion cage of the utility model;
[0018] Figure 2 It is a cross-sectional view of a coated expandable intervertebral fusion cage of the utility model;
[0019] Figure 3 It is a three-dimensional cross-sectional view of a coated expandable intervertebral fusion device of the utility model;
[0020] Figure 4 is a schematic diagram of the end plate of the utility model;
[0021] Figure 5 It is a schematic diagram of the end cover of the utility model;
[0022] Reference numerals:
[0023] Fusion device body 1, anti-dislocation tooth 11, bone graft window 12, transition arc surface 13, secondary bone graft window 14, end plate 2, end cover 3, coating 4, micro-textured surface 4-1. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0026] A coated expandable intervertebral fusion cage, such as Figure 1 , 3 As shown, it includes a fusion device body 1, an end plate 2 and an end cover 3; the end plate 2 and the end cover 3 are arranged on both sides of the inside of the fusion device body 1; the fusion device body 1 is provided with anti-slip teeth 11 and a bone grafting window 12; the surface of the fusion device body 1 is sprayed with a coating 4.
[0027] Specifically, the invention comprises a fusion device body 1, an end plate 2 and an end cover 3; the end plate 2 and the end cover 3 are arranged on both sides of the fusion device body 1; the fusion device body 1 is provided with anti-slip teeth 11 and a bone grafting window 12; the surface of the fusion device body 1 is sprayed with a coating 4, so that after the intervertebral disc is removed, the end cover 3 of the fusion device is first disassembled, the fusion device is implanted into the intervertebral body, the distraction instrument enters from the end of the end cover 3, extends and is fixed in the hole of the end plate 2, and the distraction instrument is rotated 90° in the clockwise direction to achieve the distraction purpose, and when the bone graft is completely implanted, the end cover 3 removed before is assembled; and the coating 4 improves the performance of bone ingrowth in the later stage of implantation, avoids the unsatisfactory fusion caused by the direct contact of the fusion device body 1 with the vertebral surface, and due to the special structural setting of the anti-slip teeth 11, when it assumes its own anti-slip function, it also increases the surface area and hierarchical structure of the surface of the fusion device body 1 where it is located, thereby facilitating a better combination of the coating 4 between different levels, improving the stability of the coating 4, and unexpectedly further improving the effect of the coating 4.
[0028] As a preferred embodiment of the above, Figure 1As shown, a micro-textured surface 4 - 1 is provided on the surface of the fusion device body 1 that needs to be sprayed, and the micro-textured surface 4 - 1 improves the adhesion of the coating 4 .
[0029] Specifically, a micro-texture surface 4-1 is provided on the surface of the fusion device body 1 that needs to be sprayed. The micro-texture surface 4-1 has a structure that improves the adhesion of the coating 4, so as to introduce tiny textures or concave-convex structures on the surface of the fusion device body 1 to increase its surface area, which helps the adhesion and long-term stability of the coating 4; the micro-texture can also simulate the structure of natural bone tissue and promote the growth of bone cells and bone bonding.
[0030] As a preferred embodiment of the above, Figure 1 , 3 As shown, a micropore group is also provided on the micro-textured surface 4 - 1 , and the micropore group increases the penetration depth of the coating 4 .
[0031] Specifically, a micropore group is also provided on the microtextured surface 4-1, and the micropore group has a structure that improves the penetration depth of the coating 4, thereby increasing the penetration depth of the coating 4, improving the bonding force between the coating 4 and the fusion device body 1, and further improving the durability and biocompatibility of the coating 4.
[0032] As a preferred embodiment of the above, Figure 1 As shown, a uniform and smooth transition arc surface 13 is provided at the edge between the fusion device body 1 and the anti-slip teeth 11 .
[0033] Specifically, a uniform and smooth transition arc surface 13 is provided at the edge between the fusion device body 1 and the anti-slip teeth 11 to prevent the coating 4 at the edge from falling off or peeling off.
[0034] As a preferred embodiment of the above, Figure 1 As shown, a secondary bone grafting window 14 is also provided on the fusion device body 1 .
[0035] Specifically, the secondary bone grafting window 14 is provided on the fusion device body 1 so as to perform bone grafting and fusion twice, before and after distraction, thereby fully ensuring the amount of bone grafting.
[0036] As a preferred embodiment of the above, Figure 1 As shown, the coating 4 is sprayed only on the surface of the fusion device body 1 other than the secondary bone graft window 14 .
[0037] Specifically, by spraying the coating 4 only on the surface of the fusion device body 1 other than the secondary bone graft window 14, different products can be adapted according to different usage conditions, thereby further reducing the cost.
[0038] As a preferred embodiment of the above, Figure 1 As shown, the fusion device body 1 is made of polyetheretherketone (PEEK) material, and the end plate 2 and the end cover 3 are made of titanium alloy TC4 material.
[0039] As a preferred embodiment of the above, Figure 1 As shown, the coating 4 is a pure titanium Ti coating or a hydroxyapatite HA coating or a pure titanium Ti + hydroxyapatite HA double coating.
[0040] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A coated expandable intervertebral fusion cage, characterized in that: It comprises a fusion device body (1), an end plate (2) and an end cover (3); The end plate (2) and the end cover (3) are arranged on both sides of the interior of the fusion device body (1); The fusion device body (1) is provided with anti-dislocation teeth (11) and a bone grafting window (12); The surface of the fusion device body (1) is sprayed with a coating (4).
2. The expandable intervertebral fusion cage with coating according to claim 1, characterized in that: A micro-textured surface (4-1) is provided on the surface of the fusion device body (1) that needs to be sprayed, and the micro-textured surface (4-1) improves the adhesion of the coating (4).
3. The expandable intervertebral fusion cage with coating according to claim 2, characterized in that: A micropore group is also provided on the microtextured surface (4-1), and the micropore group increases the penetration depth of the coating (4).
4. The expandable intervertebral fusion cage with coating according to claim 3, characterized in that: The edge between the fusion device body (1) and the anti-slip teeth (11) is provided with a uniform and smooth transition arc surface (13).
5. The expandable intervertebral fusion cage with coating according to claim 1, characterized in that: A secondary bone grafting window (14) is also provided on the fusion device body (1).
6. The expandable intervertebral fusion cage with coating according to claim 5, characterized in that: The coating (4) is sprayed only on the surface of the fusion device body (1) other than the secondary bone graft window (14).
7. The expandable intervertebral fusion cage with coating according to claim 1, characterized in that: The fusion device body (1) is made of polyetheretherketone (PEEK) material, and the end plate (2) and the end cover (3) are made of titanium alloy (TC4) material.
8. The expandable intervertebral fusion cage with coating according to claim 1, characterized in that: The coating (4) is a pure titanium (Ti) coating or a hydroxyapatite (HA) coating or a double coating of pure titanium (Ti) + hydroxyapatite (HA).