Combined implant

Abstract

The invention discloses a combined implant, and belongs to the field of implants. The appearance of a shell of the combined implant is in a circular truncated cone shape, the side wall of the bottom end is an arc face, and a through hole penetrating through the top and the bottom is formed in an inner cavity. The through hole is in a circular truncated cone shape, and a first preset angle is formed between the side wall and the central axis of the shell; an annular solid part is arranged at the top of the shell, and the rest part is of a first porous structure; the solid part is provided with an annular groove which is recessed downwards from the top surface, and the side wall of the annular groove is provided with a first thread; a top plate of the mandrel is arranged on the top surface of the shaft body; a second preset angle is formed between the side wall of the shaft body and the central axis of the shaft body; the upper end face of the fixing ring is arranged on the bottom face of the top plate, and the shaft body is located in an inner cavity of the fixing ring. A second thread matched with the first thread in position and shape is arranged on the side wall of the fixing ring; the first preset angle is larger than the second preset angle, so that a placing cavity is formed between the shell and the mandrel after the mandrel is assembled on the shell. According to the invention, long-term biological fixation of the combined implant can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of implants, 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 patients with tooth loss, missing teeth, and various dental diseases in my country. The results of a survey in 2007 showed that the average number of missing teeth for people over 50 years old in my country was 11, and the total tooth loss of people over 65 years old was 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. Compared with denture repair methods, the surgical price of dental implant repair methods is more expensive, which is 2.5 times the price 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 classified into one-piece implants and two-piece implants according to their structure. Currently, one-piece implants are still the mainstream. Existing one-piece implants are mainly fixed in the long term by spraying or modification. The long-term fixation effect of implants is poor, which will lead to a certain proportion of implant long-term fixation failure. 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 is mainly fixed in the long term by spraying or modification, the long-term fixation effect of the implant is poor, and a certain proportion of the implant long-term fixation failures will occur.

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

[0006] The embodiment of the present invention provides a combined implant, including an outer shell and a core shaft; the outer shell has a truncated cone shape, 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 through hole has a truncated cone shape, and the side wall is at a first preset angle with the central axis of the outer shell; the top of the outer 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 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 is at 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 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 outer shell, a placement cavity is formed between the outer shell and the core shaft.

[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 manner, 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 manner, 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 manner, the outer wall of the shaft body is provided with a second porous structure with a preset thickness.

[0013] In a possible implementation manner, 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 the embodiment of the present invention, in actual use, since the inner cavity of the shell is provided with a through hole penetrating the top and the bottom, the top of the shell is provided with an annular solid part, 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 side wall of the fixing ring of the mandrel is provided with a second thread whose position and shape are adapted to the first thread, and the shaft body is located in the inner cavity of the fixing ring. The shell and the mandrel are assembled, the shell and the mandrel are tightened by threaded matching, the shaft body of the mandrel extends into the through hole of the shell, and the front end of the shaft body extends out of the through hole to obtain the combined implant. When the combined implant is placed in the alveolus, the overall shape of the combined implant causes little damage to the alveolus and can adapt to the shape of the alveolus. The rest of the shell except the solid part is a first porous structure, so that the combined implant can contact the bone of the alveolar bone, and the bone grows into the first porous structure and the placement cavity of the combined implant, so that the alveolus and the combined implant are firmly fixed, and the long-term biological fixation of the combined implant can be achieved. In addition, the first preset angle is greater than the second preset angle, so that when the combined implant is placed in the tooth socket, it has a pressurizing effect, so that the combined implant is firmly placed in the tooth socket, and the adhesion of the first porous structure to the bone is increased, so as to achieve the effect of connecting the internal and external bones. After the core shaft is assembled to the shell, a placement cavity is formed between the shell and the core shaft, and the placement cavity can be filled with human autologous bone, artificial bone and bone active factors, so as to have a bone induction effect, improve the ability and depth of bone growth, further firmly fix the tooth socket and the combined implant, and realize the 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 accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

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

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

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

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

[0022] Figure 5 A schematic diagram of the structure of a mandrel provided in the first embodiment of the present application;

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

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

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

[0026] Fig. 9 A schematic diagram of the structure of a mandrel provided in a third embodiment of the present application;

[0027] Fig.10 for Fig. 9 Middle CC section view;

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

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

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

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

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

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

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

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

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

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

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

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

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

[0041] Fig.24 for Fig.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 edge ring; 17-placing 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 positions or positional relationships based on the positions 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, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. 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 a curved surface 10, and the center of the sphere where the curved surface 10 is located is located inside the shell 1. Therefore, when the combined implant is placed in the tooth socket, the outer shell 1 with a truncated cone shape and a side wall at the bottom as the curved surface 10 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 penetrating the top and the bottom. The through hole 11 is in the shape of a truncated cone. Fig.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 part 12, and the rest is a first porous structure 13. The solid part 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 solid part 12 is used to set the annular groove 14 and the first thread 15. The first thread 15 can be set on the first side wall of the annular groove 14 close to the central axis of the housing 1, or on the second side wall of the annular groove 14 away from the central axis, as shown in FIG. Figures 1 to 4 The schematic structural diagram shows that the first thread 15 is arranged on the first side wall of the annular groove 14 .

[0049] like Figures 5 to 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. Fig.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 surface of the fixing ring 21 is arranged on the bottom surface 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 surface 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 Fig.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 in 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 alveolus, it has a pressurizing effect. Fig.12As shown, the resultant force F at any point A on the surface of the mandrel 2 is 合 Vertically downward, the resultant force F 合 Decomposed into the component force F along the inclined plane y and the component 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 in the first porous structure 13 and the bone in the placement cavity 17 can be fused with the bone outside the shell 1, which is beneficial to the connection of the bone inside and outside 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, in actual use, is that the inner cavity of the shell 1 is provided with a through hole 11 penetrating the top and the bottom, the top of the shell 1 is provided with an annular solid part 12, the solid part 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, the shell 1 and the core shaft 2 are tightened by threaded fitting, 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 alveolus, the overall shape of the combined implant causes little damage to the alveolus and can adapt to the shape of the alveolus. The rest of the shell 1 except the solid part 12 is the first porous structure 13, so that the combined implant can contact the bone 3 of the alveolar bone, and the bone 3 grows into the first porous structure 13 and the placement cavity 17 of the combined implant, so that the alveolar and the combined implant are firmly fixed, and the long-term biological fixation of the combined implant can be achieved. In addition, the first preset angle α is greater than the second preset angle β, so that when the combined implant is placed in the alveolar, it has a pressurizing effect, so that the combined implant is firmly placed in the alveolar, and the first porous structure 13 and the bone 3 are attached, so as to achieve the effect of connecting the inner and outer bones 3. After the core shaft 2 is assembled on the shell 1, a placement cavity 17 is formed between the shell 1 and the core shaft 2, and the placement cavity 17 can be filled with human autologous bone, artificial bone and bone active factors, so as to have a bone induction effect, improve the ability and depth of bone growth, and further firmly fix the alveolar and the combined implant, so as to achieve the 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, so that when the placement cavity 17 is filled with human autologous bone, artificial bone and bone active factor, the inner ring 16 can effectively support the human autologous bone, artificial bone and bone active factor filled in the placement cavity 17. In addition, when the core shaft 2 is assembled to the housing 1 and the core shaft 2 rotates, the pressure on the core shaft 2 is increased.

[0055] like Figure 2 As shown, the outer wall of the shell 1 is provided with a tapered thread, and the shell 1 is provided with a structure having a first porous structure 13 and a tapered thread. In the actual use of the combined implant, the tapered thread and the bone 3 of the alveolar support each other, and the tapered thread gives a large friction force to the pressing groove, so that the tapered thread on the outer wall of the shell 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 also includes an osteoinductive ceramic coating. The osteoinductive ceramic coating is provided on the outer wall of the housing 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 may be a hydroxyapatite (HA) coating, which is similar to the chemical composition of human bone 3, has good biocompatibility and osteoinductive ability, and can induce bone tissue generation without adding growth factors or living cells, thereby improving the ability and depth of bone ingrowth. The osteoinductive ceramic coating may be provided on the outer wall of the housing 1 by spraying an osteoinductive ceramic coating such as a hydroxyapatite coating on the housing 1 by plasma spraying.

[0058] Furthermore, the porosity of the first porous structure 13 is 40% to 80%. This porosity is suitable for bone ingrowth. If the porosity is too small, the porous structure is small, which is not conducive to the attachment of bone cells. If the pores are too large, the strength of the porous jacket is low, and the cells are not firmly attached. Too small or too large a bone porosity cannot form bone ingrowth efficiently.

[0059] like Figure 7 and Figure 8 As shown, the outer wall of the shaft body 22 is provided with a tapered thread, so as to increase the contact area between the shaft body 22 and the human autologous bone, artificial bone and bone active factor 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 alveolar socket.

[0060] like Fig. 9 and Fig.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 Fig.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 mandrel 2 are screwed together through threaded fit, and the height of the annular groove 14 is greater than the height of the fixing ring 21, so that the height of the annular groove 14 can have a margin relative to the fixing ring 21, so that after the housing 1 and the mandrel 2 are screwed together, the bottom surface of the top plate 20 of the mandrel 2 fits more tightly with the top surface of the housing 1, thereby making the combined implant more integrated, which is beneficial to subsequent actual use.

[0062] Optionally, the combined implant is formed by 3D printing. 3D printing does not increase the cost when manufacturing complex objects, and a complete product can be directly printed, with high material utilization. The combined implant of the embodiment of the present application is formed by 3D printing, with precise size and appropriate cost.

[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 implant of the embodiment of the present application can be made of pure titanium, titanium alloy, carbon fiber reinforced PEEK and other medical metals or polymer materials with strength that meets the requirements. The combined implant of the embodiment of the present application facilitates clinical surgical operation, can accelerate bone fusion, improve postoperative stability and reduce negative 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 may still be modified, or some or all of the technical features thereof may 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 at the bottom 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 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 mandrel comprises 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 central axis; The upper end surface of the fixing ring is arranged 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 match 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 of 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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