A combined implant

Abstract

The present application discloses a combined implant, which belongs to the field of implants. The outer shell of the combined implant is in the shape of a truncated cone, and the side wall at the bottom is an arc surface, and the inner cavity is provided with a through hole that passes through the top and the bottom; the outer shell is in the shape of a truncated cone, and the side wall is at a first preset angle to the central axis of the shell; the top of the shell is provided with an annular solid part, and the rest is a first porous structure; the solid part is provided with an annular groove recessed downward from the top surface, and the side wall of the annular groove is provided with a first thread; the top plate of the core shaft is provided on the top surface of the shaft body; the side wall of the shaft body is at a second preset angle to its own central axis; the upper end surface of the fixing ring is provided on the bottom surface of the top plate, and the shaft body is located in the inner cavity of the fixing ring; the side wall of the fixing ring is provided with a second thread whose position and shape are compatible with the first thread; the first preset angle is greater than the second preset angle, so that after the core shaft is assembled on the shell, a placement cavity is formed between the shell and the core shaft. The present application can achieve long-term biological fixation of the combined implant.

Description

Technical Field

[0001] The present application relates to the field of implant technology, and in particular to a combined implant. Background Art

[0002] Tooth loss is a common and frequently occurring disease in humans. According to statistics, there are more than 370 million people in my country who are missing teeth, have missing teeth, or suffer from various dental diseases. The results of a 2007 survey showed that the average number of missing teeth for people over 50 years old in my country is 11, and the total tooth loss for people over 65 years old is as high as 30%. Methods for repairing tooth loss include denture repair methods (denture repair methods) and dental implant repair methods. The price of denture repair methods is lower than that of dental implant repair methods, but dentures require long-term maintenance and redoing. Denture repair methods are more expensive than denture repair methods, and the price is 2.5 times that of denture repair methods. However, the implants of dental implant repair methods can be used for life, and they are beautiful and comfortable, and are increasingly recognized and used by people.

[0003] Artificial dental implants are categorized by structure into two types: one-piece and two-piece. Currently, one-piece implants remain the most popular type. Existing one-piece implants primarily achieve long-term fixation through spraying or modification, resulting in poor long-term fixation and a certain percentage of implant failures. Summary of the Invention

[0004] The embodiment of the present application provides a combined implant, which can solve the problem that the existing one-piece implant mainly achieves long-term fixation through spraying or modification, the long-term fixation effect of the implant is poor, and a certain proportion of the implants will fail in long-term fixation.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is:

[0006] 20. The repairing kit for automotive dents, according to claim 19, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, the screw bolts comprising a through-hole and a nut. The bosses comprise a through-hole, the screw bolts comprising a through-hole and a nut.

[0007] In a possible implementation, the bottom of the shell is provided with an inner edge ring extending from the inner wall toward the central axis.

[0008] In a possible implementation, an outer wall of the housing is provided with a tapered thread.

[0009] In a possible implementation, the combined implant further includes an osteoinductive ceramic coating; the osteoinductive ceramic coating is prepared on the outer wall of the shell.

[0010] In a possible implementation, the porosity of the first porous structure is 40% to 80%.

[0011] In a possible implementation, the outer wall of the shaft body is provided with a tapered thread.

[0012] In a possible implementation, the outer wall of the shaft body is provided with a second porous structure of a preset thickness.

[0013] In a possible implementation, the height of the annular groove is greater than the height of the fixing ring.

[0014] In one possible implementation, the combined implant is formed by 3D printing.

[0015] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0016] The combined implant provided by an embodiment of the present invention, in actual use, has an inner cavity of the shell provided with a through hole extending through the top and bottom, an annular solid portion provided at the top of the shell, an annular groove recessed downward from the top surface provided on the solid portion, and a first thread provided on the sidewall of the annular groove. The sidewall of the fixing ring of the mandrel is provided with a second thread whose position and shape match the first thread, and the shaft is located in the inner cavity of the fixing ring. The shell and the mandrel are assembled and tightened by threaded engagement, the shaft of the mandrel extends into the through hole of the shell, and the front end of the shaft extends out of the through hole to obtain the combined implant. When the combined implant is placed in the tooth socket, the overall shape of the combined implant causes minimal damage to the tooth socket and can adapt to the shape of the tooth socket. The remaining portion of the shell, excluding the solid portion, is a first porous structure, enabling the combined implant to contact the bone of the alveolar bone. Bone grows into the first porous structure and placement cavity of the combined implant, firmly fixing the tooth socket and the combined implant, and enabling long-term biological fixation of the combined implant. Furthermore, the first preset angle is greater than the second preset angle, thereby exerting a pressure-applying effect when the combined implant is placed into the tooth socket, firmly placing the combined implant within the tooth socket and increasing the adhesion of the first porous structure to the bone, thereby achieving a through-connection between the internal and external bone. After the core shaft is assembled with the housing, a placement cavity is formed between the housing and the core shaft. This cavity can be filled with autologous human bone, artificial bone, and bone-active factors, thereby providing an osteoinductive effect, enhancing the ability and depth of bone ingrowth, further firmly securing the tooth socket to the combined implant, and enabling long-term biological fixation of the combined implant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of a housing provided in the first embodiment of the present application;

[0019] Figure 2 A schematic structural diagram of a housing provided in accordance with a second embodiment of the present application;

[0020] Figure 3 A schematic structural diagram of a housing provided in accordance with a third embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a housing provided in accordance with a fourth embodiment of the present application;

[0022] Figure 5 A schematic structural diagram of a core shaft provided in the first embodiment of the present application;

[0023] Figure 6 for Figure 5 Middle AA section view;

[0024] Figure 7 A schematic structural diagram of a mandrel provided in the second embodiment of the present application;

[0025] Figure 8 for Figure 7 Middle BB section view;

[0026] Figure 9 A schematic structural diagram of a core shaft provided in the third embodiment of the present application;

[0027] Figure 10 for Figure 9 Middle CC section view;

[0028] Figure 11 A three-dimensional diagram of a combined implant provided in the first embodiment of the present application;

[0029] Figure 12 for Figure 11 A cross-sectional view of a combined implant;

[0030] Figure 13 for Figure 11 Schematic diagram of the structure of the combined implant and bone;

[0031] Figure 14 A three-dimensional diagram of a combined implant provided in the second embodiment of the present application;

[0032] Figure 15 for Figure 14 A cross-sectional view of a combined implant;

[0033] Figure 16 for Figure 14 Schematic diagram of the structure of the combined implant and bone;

[0034] Figure 17 A cross-sectional view of a combined implant provided in a third embodiment of the present application;

[0035] Figure 18 for Figure 17 Schematic diagram of the structure of the combined implant and bone;

[0036] Figure 19 A cross-sectional view of a combined implant provided in accordance with a fourth embodiment of the present application;

[0037] Figure 20 for Figure 19 Schematic diagram of the structure of the combined implant and bone;

[0038] Figure 21 A cross-sectional view of a combined implant provided in a fifth embodiment of the present application;

[0039] Figure 22 for Figure 21 Schematic diagram of the structure of the combined implant and bone;

[0040] Figure 23 A cross-sectional view of a combined implant provided in accordance with a sixth embodiment of the present application;

[0041] Figure 24 for Figure 23 Schematic diagram of the structure of the combined implant and bone.

[0042] Icons: 1-shell; 10-arc surface; 11-through hole; 12-solid part; 13-first porous structure; 14-annular groove; 15-first thread; 16-inner ring; 17-placement cavity; 2-core shaft; 20-top plate; 21-fixing ring; 22-axis body; 23-second thread; 24-second porous structure; 25-inner hexagonal structure; 26-third thread; 3-bone; α-first preset angle; β-second preset angle. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0045] Please refer to Figures 1 to 24 As shown, an embodiment of the present invention provides a combined implant, including a shell 1 and a core shaft 2.

[0046] like Figures 1 to 4 As shown, the outer shape of the shell 1 is a truncated cone, and the side wall at the bottom is an arc surface 10. The center of the sphere where the arc surface 10 is located is located inside the shell 1. Therefore, when the combined implant is placed in the tooth socket, the shell 1 with a truncated cone shape and a side wall at the bottom is an arc surface 10, which causes little damage to the tooth socket and can adapt to the shape of the tooth socket.

[0047] Continue to refer to Figures 1 to 4 As shown, the inner cavity of the housing 1 is provided with a through hole 11 that passes through the top and the bottom. The shape of the through hole 11 is a truncated cone. Figure 12 As shown, the side wall of the through hole 11 forms a first preset angle α with the central axis of the housing 1 .

[0048] like Figures 1 to 4 As shown, the top of the housing 1 is provided with an annular solid portion 12, and the rest of the portion is a first porous structure 13. The solid portion 12 is provided with an annular groove 14 recessed downward from the top surface, and the sidewall of the annular groove 14 is provided with a first thread 15. The solid portion 12 is used to provide the annular groove 14 and the first thread 15. The first thread 15 can be provided on the first sidewall of the annular groove 14 close to the central axis of the housing 1, or on the second sidewall of the annular groove 14 away from the central axis, as shown in FIG. Figures 1 to 4 The schematic diagram shows a structure in which a first thread 15 is provided on a first side wall of the annular groove 14 .

[0049] like Figures 5-10 As shown, the core shaft 2 includes a top plate 20, a fixing ring 21 and a shaft body 22. The top plate 20, the fixing ring 21 and the shaft body 22 are integrally formed. The top plate 20 is arranged on the top surface of the shaft body 22. Figure 12 As shown, the side wall of the shaft body 22 forms a second preset angle β with its own central axis.

[0050] The upper end face of the fixing ring 21 is arranged on the bottom face of the top plate 20, and the shaft body 22 is located in the inner cavity of the fixing ring 21. The height of the shaft body 22 is greater than the height of the through hole 11. The bottom end face of the shaft body 22 is an arc surface 10, so that when the combined implant is placed in the tooth socket, the tooth socket is less damaged and can adapt to the shape of the tooth socket. The side wall of the fixing ring 21 is provided with a second thread 23 whose position and shape are adapted to the first thread 15. Specifically, when the first thread 15 is provided on the first side wall of the annular groove 14, the second thread 23 is provided on the inner wall of the fixing ring 21. When the first thread 15 is provided on the second side wall of the annular groove 14, the second thread 23 is provided on the outer wall of the fixing ring 21.

[0051] like Figure 12 As shown, the first preset angle α is greater than the second preset angle β, so that after the core shaft 2 is assembled with the shell 1, a placement cavity 17 is formed between the shell 1 and the core shaft 2, so that when the combined implant is placed in the tooth socket, it has a pressurizing effect. Figure 12As shown, the resultant force F acting on any point A on the surface of the core shaft 2 is 合 Vertically downward, the net force F 合 Decomposed into the component force F along the inclined plane y and the component of force F perpendicular to the inclined plane X , and the component force F perpendicular to the inclined plane X It can compress the bone. After the bone is compressed toward the inner wall of the shell 1 (the inner wall of the through hole 11), the bone inside the first porous structure 13 and the bone inside the placement cavity 17 can be fused with the bone outside the shell 1, which is beneficial to the connection between the inside and outside of the shell 1, the delivery of nutrients, and the later bone growth.

[0052] The core shaft 2 is provided with an inner hexagonal structure 25 and a third thread 26 from the top surface downwards. The third thread 26 can cooperate with the base, and the inner hexagonal structure 25 can cooperate with the tool.

[0053] The combined implant provided by the embodiment of the present invention, when actually used, is provided with a through hole 11 passing through the top and the bottom of the inner cavity of the shell 1, an annular solid portion 12 is provided on the top of the shell 1, the solid portion 12 is provided with an annular groove 14 recessed downward from the top surface, and the side wall of the annular groove 14 is provided with a first thread 15. The side wall of the fixing ring 21 of the core shaft 2 is provided with a second thread 23 whose position and shape are adapted to the first thread 15, and the shaft body 22 is located in the inner cavity of the fixing ring 21. The shell 1 and the core shaft 2 are assembled, and the shell 1 and the core shaft 2 are tightened by threaded fitting, and the shaft body 22 of the core shaft 2 extends into the through hole 11 of the shell 1, and the front end of the shaft body 22 extends out of the through hole 11 to obtain a combined implant. When the combined implant is placed in the tooth socket, the overall shape of the combined implant causes little damage to the tooth socket and can adapt to the shape of the tooth socket. The remaining portion of the shell 1, excluding the solid portion 12, comprises a first porous structure 13, which allows the combined implant to contact the bone 3 of the alveolar bone. The bone 3 then grows into the first porous structure 13 and placement cavity 17 of the combined implant, firmly securing the alveolar and the combined implant, thereby achieving long-term biological fixation of the combined implant. Furthermore, the first preset angle α is greater than the second preset angle β, thereby exerting a pressurizing effect when the combined implant is placed into the alveolar, firmly placing the combined implant within the alveolar and increasing the adhesion of the first porous structure 13 to the bone 3, thereby achieving a through-connection between the inner and outer bone 3. After the core shaft 2 is assembled with the shell 1, a placement cavity 17 is formed between the shell 1 and the core shaft 2. The placement cavity 17 can be filled with autologous human bone, artificial bone, and bone-active factors, thereby providing an osteoinductive effect, improving the ability and depth of bone ingrowth, and further firmly securing the alveolar and the combined implant, thereby achieving long-term biological fixation of the combined implant.

[0054] like Figures 1 to 4As shown, the bottom of the housing 1 is provided with an inner ring 16 extending from the inner wall toward the central axis. This inner ring 16 effectively supports the autologous human bone, artificial bone, and bone active factors when they are placed in the placement cavity 17. Furthermore, when the core shaft 2 is assembled in the housing 1 and the core shaft 2 rotates, the inner ring 16 increases the pressure applied to the core shaft 2.

[0055] like Figure 2 As shown, the outer wall of the housing 1 is provided with a tapered thread. In this case, the housing 1 is configured to have a structure comprising a first porous structure 13 and a tapered thread. During actual use of the combined implant, the tapered thread and the alveolar bone 3 support each other, and the tapered thread exerts a significant friction force on the pressure groove. Therefore, the tapered thread provided on the outer wall of the housing 1 can effectively prevent the combined implant from sinking.

[0056] Furthermore, if Figure 3 and Figure 4 As shown, the combined implant provided in the embodiment of the present application further includes an osteoinductive ceramic coating. The osteoinductive ceramic coating is provided on the outer wall of the shell 1. Specifically, Figure 3 As shown, the shell 1 is configured to have a first porous structure 13 and an osteoinductive ceramic coating, or as Figure 4 As shown, the housing 1 is configured to have a first porous structure 13, an osteoinductive ceramic coating and a tapered thread.

[0057] The osteoinductive ceramic coating can be a hydroxyapatite (HA) coating, which has a chemical composition similar to human bone 3 and exhibits excellent biocompatibility and osteoinductive properties. It can induce bone tissue formation without the addition of growth factors or living cells, thereby enhancing the ability and depth of bone ingrowth. The osteoinductive ceramic coating can be applied to the outer wall of the housing 1 by plasma spraying, such as a hydroxyapatite coating.

[0058] Furthermore, the first porous structure 13 has a porosity of 40% to 80%. This porosity is suitable for bone ingrowth. If the porosity is too low, the porous structure is less porous, which is not conducive to bone cell attachment. If the porosity is too large, the porous outer shell is weak and cells cannot attach firmly. Bone ingrowth cannot be effectively achieved when the porosity is too low or too high.

[0059] like Figure 7 and Figure 8 As shown, the outer wall of the shaft body 22 is provided with a tapered thread, which can increase the contact area between the shaft body 22 and the human autologous bone, artificial bone and bone active factors filled in the placement cavity 17, thereby increasing the area of ​​bone ingrowth and improving the stability of the combined implant after implantation in the tooth socket.

[0060] like Figure 9 and Figure 10As shown, the outer wall of the shaft body 22 is provided with a second porous structure 24 of a preset thickness, which can improve the stability of the bone 3 and the survival probability of the bone 3, and increase the area of ​​bone ingrowth after pressurization.

[0061] Furthermore, if Figure 12 As shown, the height of the annular groove 14 is greater than the height of the fixing ring 21. In actual assembly, the annular groove 14 of the housing 1 and the fixing ring 21 of the core shaft 2 are screwed together through threaded engagement. The height of the annular groove 14 is greater than the height of the fixing ring 21, which allows for a margin in the height of the annular groove 14 relative to the fixing ring 21. As a result, after the housing 1 and core shaft 2 are screwed together, the bottom surface of the top plate 20 of the core shaft 2 fits more tightly against the top surface of the housing 1, thereby further enhancing the integration of the combined implant and facilitating subsequent practical use.

[0062] Optionally, the combined implants can be formed using 3D printing. 3D printing does not increase the cost of manufacturing complex objects, allowing for direct printing of complete products with high material utilization. The combined implants of the embodiments of this application, formed using 3D printing, achieve precise dimensions and are cost-effective.

[0063] The first porous structure 13 and the second porous structure 24 of the combined implant of the embodiment of the present application can be completed by using dedicated computer design software. The first porous structure 13 and the second porous structure 24 can be unit cell structures such as regular hexahedron and regular octahedron.

[0064] The combined implants of the present invention can be made of pure titanium, titanium alloys, carbon fiber reinforced PEEK, and other medical metals or polymers with strength that meets the requirements. The combined implants of the present invention facilitate clinical surgical procedures, accelerate bone union, improve postoperative stability, and reduce negative side effects.

[0065] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0066] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A combined implant, characterized in that: including a housing and a mandrel; The outer shell has a truncated cone shape, and the side wall of the bottom end is an arc surface, and the inner cavity is provided with a through hole penetrating the top and the bottom; The through hole has a truncated cone shape, and the side wall forms a first preset angle with the central axis of the housing; The top of the shell is provided with an annular solid portion, and the rest of the shell is a first porous structure; The solid portion is provided with an annular groove recessed downward from the top surface, and the side wall of the annular groove is provided with a first thread; The core shaft includes a top plate, a fixing ring and a shaft body; The top plate is arranged on the top surface of the shaft body; The side wall of the shaft body forms a second preset angle with its own central axis; The upper end surface of the fixing ring is arranged on the bottom surface of the top plate, and the shaft is located in the inner cavity of the fixing ring; The side wall of the fixing ring is provided with a second thread whose position and shape are adapted to the first thread; The first preset angle is greater than the second preset angle, so that after the core shaft is assembled in the shell, a placement cavity is formed between the shell and the core shaft.

2. The combined implant according to claim 1, characterized in that: The bottom of the shell is provided with an inner edge ring extending from the inner wall toward the central axis.

3. The combined implant according to claim 1, characterized in that: The outer wall of the shell is provided with a tapered thread.

4. The combined implant according to claim 1 or 3, characterized in that: Also included are osteoinductive ceramic coatings; The osteoinductive ceramic coating is prepared on the outer wall of the shell.

5. The combined implant according to claim 1, characterized in that: The porosity of the first porous structure is 40% to 80%.

6. The combined implant according to claim 1, characterized in that: The outer wall of the shaft body is provided with a tapered thread.

7. The combined implant according to claim 1 or 6, characterized in that: The outer wall of the shaft body is provided with a second porous structure with a preset thickness.

8. The combined implant according to claim 1, characterized in that: The height of the annular groove is greater than the height of the fixing ring.

9. The combined implant according to claim 1, characterized in that: The combined implant is formed by 3D printing.

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