Method for manufacturing joint prosthesis and joint prosthesis

Abstract

The present invention provides a method for manufacturing a joint prosthesis and a joint prosthesis. The method comprises the following steps: obtaining a joint mating portion blank and a bony connecting portion blank, wherein the bony connecting portion blank includes a trabecular portion and a protective shell covering the trabecular portion; performing a surface treatment on the joint mating portion blank; and removing the protective shell after the surface treatment of the joint mating portion blank is completed. The technical solution of the present application can effectively solve the problem in the related art of polishing the joint surface of an orthopedic implant with a trabecular structure, which is the difficulty in removing polishing paste that has entered the trabecular structure.

Description

Technical Field

[0001] The present invention relates to the technical field of prostheses, and in particular to a method for manufacturing a joint prosthesis and the joint prosthesis. Background Art

[0002] In related technologies, additive manufacturing technology can be used to manufacture orthopedic implant products with trabecular bone structures. Implants with trabecular bone structures can achieve short-term fixation after being implanted into the human body. In the medium and long term, bone tissue can achieve bone ingrowth at the bone interface, achieving the goal of long-term fixation.

[0003] However, polishing the articular surface of orthopedic implants requires the use of polishing paste. For orthopedic implants with trabecular bone structures, the polishing paste can enter the trabecular bone during polishing, making it difficult to remove. This can cause harm to the patient after implantation. Therefore, achieving polishing of the articular surface of orthopedic implants with trabecular bone structures is a bottleneck limiting the development of orthopedic implants. Summary of the Invention

[0004] The main purpose of the present invention is to provide a method for manufacturing a joint prosthesis and a joint prosthesis to solve the problem in the related art that it is difficult to remove the polishing paste that has entered the trabecular structure when polishing the joint surface of an orthopedic implant with a trabecular structure.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a method for manufacturing a joint prosthesis is provided, comprising the following steps: obtaining a joint mating part blank and a bone connecting part blank, the bone connecting part blank comprising a trabecular part and a protective shell covering the outside of the trabecular part; performing surface treatment on the joint mating part blank; and removing the protective shell after completing the surface treatment of the joint mating part blank.

[0006] Furthermore, the step of performing surface treatment on the joint fitting part blank includes: performing grinding and polishing treatment on the joint fitting part blank.

[0007] Furthermore, the step of obtaining the joint fitting part blank and the bone connection part blank includes: obtaining the joint fitting part blank and the bone connection part blank by additive manufacturing.

[0008] Furthermore, cobalt-chromium-molybdenum powder is used for additive manufacturing of the joint fitting part blank and the bone connection part blank.

[0009] Furthermore, the thickness of the protective shell is greater than or equal to twice the thickness of the additive manufacturing powder and less than or equal to 3 mm.

[0010] Furthermore, the distance between the inner surface of the protective shell and the outer surface of the trabecular portion is greater than or equal to twice the thickness of the additive manufacturing powder to form a protective space.

[0011] Furthermore, the step of removing the protective shell includes: peeling off the protective shell with a clamping member.

[0012] Furthermore, after the step of removing the protective shell, the manufacturing method further comprises: removing burrs at the intersection of the joint fitting portion blank and the trabecular portion.

[0013] According to another aspect of the present invention, a joint prosthesis is provided. The joint prosthesis is manufactured using the above-mentioned manufacturing method.

[0014] Furthermore, the joint prosthesis is a knee joint prosthesis, the joint matching part blank of the knee joint prosthesis is a solid structure, a porous structure layer is provided on the side of the joint matching part blank facing the bone connection part blank, the trabecular part includes multiple connecting columns, and the surface of the connecting columns is provided with a porous structure layer.

[0015] Using the technical solution of the present invention, a joint mating portion blank and a bony connection portion blank are first obtained. The joint mating portion blank mates with the corresponding joint surface to restore joint function; the bony connection portion blank connects to the patient's healthy bone to secure the joint prosthesis. The bony connection portion blank includes a trabecular portion with a porous structure, which facilitates bone ingrowth after implantation into the patient's healthy bone, ensuring the stability of the prosthesis after implantation. The bony connection portion blank also includes a protective shell covering the trabecular portion. The protective shell protects the trabecular portion during surface treatment of the joint mating portion blank, preventing the polishing paste used during the surface treatment process, as well as dust and particles generated during the polishing process, from entering the porous structure of the trabecular portion. After the surface treatment of the joint mating portion blank is completed, the protective shell is removed, completing the production of the joint prosthesis. Therefore, the technical solution of the present application can effectively solve the problem of difficulty in removing polishing paste that has entered the trabecular structure when polishing the joint surface of an orthopedic implant with a trabecular structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 A schematic flow chart showing an embodiment of a manufacturing method according to the present invention is shown;

[0018] Figure 2 shows a side view of an embodiment of a joint prosthesis of the present invention;

[0019] Figure 3 Shown Figure 2 A side view of a joint prosthesis during its manufacturing process;

[0020] Figure 4A front view showing an embodiment in which the joint prosthesis of the present invention is a knee joint prosthesis;

[0021] Figure 5 Shown Figure 4 Side view of a knee prosthesis;

[0022] Figure 6 Shown Figure 4 Posterior view of the knee prosthesis; and

[0023] Figure 7 Shown Figure 4 Side view of the knee prosthesis during manufacturing.

[0024] The above drawings include the following reference numerals:

[0025] 10. Joint fitting part blank; 20. Bone connection part blank; 21. Trabecular part; 22. Protective shell; 23. Protective space. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying 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 embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0029] like Figure 1 As shown, the manufacturing method of the joint prosthesis of this embodiment includes the following steps: Step S10: obtaining a joint fitting part blank 10 and a bone connection part blank 20, the bone connection part blank 20 including a trabecular part 21 and a protective shell 22 covering the outside of the trabecular part 21; Step S20: performing surface treatment on the joint fitting part blank 10; Step S30: removing the protective shell 22 after completing the surface treatment of the joint fitting part blank 10.

[0030] Applying the technical solution of this embodiment, first obtain the joint matching part blank 10 and the bone connection part blank 20, the joint matching part blank 10 cooperates with the corresponding joint surface to reconstruct the joint function; the bone connection part blank 20 is connected to the patient's healthy bone to fix the joint prosthesis. Among them, the bone connection part blank 20 includes a trabecular part 21, and the trabecular part 21 has a porous structure. After being implanted into the patient's healthy bone, it is easy to achieve bone ingrowth and ensure the stability of the prosthesis after implantation. The bone connection part blank 20 also includes a protective shell 22 covering the outside of the trabecular part 21. The protective shell 22 can protect the trabecular part 21 when the joint matching part blank 10 is surface treated, and prevent the polishing paste used in the surface treatment process and the dust and particles generated during the polishing process from entering the porous structure of the trabecular part 21. After completing the surface treatment of the joint matching part blank 10, the protective shell 22 is removed to complete the production of the joint prosthesis. Therefore, the technical solution of this embodiment can effectively solve the problem in the related art that it is difficult to remove the polishing paste that has entered the trabecular structure when polishing the articular surface of an orthopedic implant with a trabecular structure.

[0031] The step of surface treating the joint mating part blank 10 includes grinding and polishing the joint mating part blank 10. Because the joint mating part blank 10 needs to mate with the contralateral joint surface, a high surface roughness is required for the joint mating part blank 10. Therefore, grinding and polishing are required for the joint mating part blank 10. Specifically, after grinding, the joint mating part blank 10 is polished using a polishing paste.

[0032] Furthermore, the step of obtaining the joint mating portion blank 10 and the bone connecting portion blank 20 includes: obtaining the joint mating portion blank 10 and the bone connecting portion blank 20 by additive manufacturing. Additive manufacturing (3D printing) can produce complex structures. Due to the complex shape of the articular surface of the joint mating portion blank 10 and the porous structure of the trabecular portion 21, the structure of the joint prosthesis is relatively complex, and additive manufacturing is easy to produce the joint prosthesis.

[0033] Cobalt-chromium-molybdenum powder is used for additive manufacturing of the joint mating part blank 10 and the bone connection part blank 20. Compared with materials such as titanium alloys commonly used in the manufacture of prostheses, cobalt-chromium-molybdenum material has better wear resistance and is suitable for manufacturing joint surface prostheses.

[0034] In this embodiment, the thickness of the protective shell 22 is greater than or equal to twice the thickness of the additive manufacturing powder coating and less than or equal to 3 mm. The thickness of the protective shell 22 is greater than or equal to twice the thickness of the additive manufacturing powder coating to ensure the strength of the protective shell 22, prevent damage to the protective shell 22 during surface treatment of the joint mating part blank 10, and prevent leakage of the trabecular bone portion 21 within the protective shell 22, thereby effectively protecting the trabecular bone portion 21. The thickness of the protective shell 22 is less than or equal to 3 mm, which can avoid material waste, reduce processing costs, and facilitate the subsequent removal of the protective shell 22.

[0035] It should be noted that the above-mentioned "additive manufacturing powder thickness" refers to the thickness of the cobalt, chromium, and molybdenum powders laid down during the additive printing process. Specifically, the additive manufacturing powder thickness can be set as needed.

[0036] In this embodiment, the distance between the inner surface of the protective shell 22 and the outer surface of the trabecular portion 21 is greater than or equal to twice the thickness of the additive manufacturing powder coating to form a protective space 23. Specifically, when forming the bony connection portion blank 20, cobalt-chromium-molybdenum powder is also disposed between the trabecular portion 21 and the protective shell 22, that is, the protective space 23 is filled with powdered cobalt-chromium-molybdenum material. The provision of the protective space 23 effectively separates the protective shell 22 and the trabecular portion 21, preventing adhesion between the protective shell 22 and the trabecular portion 21 during processing, which could result in the subsequent inability to remove the protective shell 22 or damage to the trabecular portion 21 during removal of the protective shell 22.

[0037] Furthermore, the step of removing the protective shell 22 includes peeling off the protective shell 22 using a clamping member. Specifically, the clamping member can be a tool such as tweezers. Since the protective shell 22 of this embodiment is relatively thin, the clamping member can be used to clamp the free end of the protective shell 22 and then peel off the protective shell 22, which has the advantage of simple operation.

[0038] In this embodiment, after the step of removing the protective shell 22, the manufacturing method further includes: removing burrs at the intersection of the joint fitting part blank 10 and the trabecular part 21. When the protective shell 22 is removed, burrs will remain between the protective shell 22 and the joint fitting part blank 10. Deburring can prevent the remaining burrs from damaging the patient's healthy bone. Preferably, the trabecular part 21 can also be deburred. During the additive manufacturing process, due to precision issues, sharp protrusions or burrs may be formed on the surface of the trabecular part 21. Deburring can prevent the sharp protrusions or burrs from damaging the patient's healthy bone.

[0039] like Figure 2 and Figure 3 As shown, the present application also provides a joint prosthesis, which is a joint prosthesis made using the above-mentioned manufacturing method. In the above-mentioned method, the protective shell 22 can protect the trabecular part 21 when the joint matching part blank 10 is subjected to surface treatment, and prevent the polishing paste used in the surface treatment process and the dust, particles, etc. generated during the polishing process from entering the porous structure of the trabecular part 21. After completing the surface treatment of the joint matching part blank 10, the protective shell 22 is removed to complete the production of the joint prosthesis. This can effectively solve the problem in the related art that it is difficult to remove the polishing paste that has entered the trabecular structure when polishing the joint surface of an orthopedic implant with a trabecular structure. Therefore, the joint prosthesis made using the above-mentioned manufacturing method also has the above-mentioned advantages.

[0040] like Figures 4 to 7 As shown, the joint prosthesis is a knee joint prosthesis. The joint mating portion blank 10 of the knee joint prosthesis is a solid structure. The joint mating portion blank 10 is provided with a porous structure layer on the side facing the bone connection portion blank 20. The trabecular portion 21 includes a plurality of connecting posts, and the surface of the connecting posts is provided with a porous structure layer. The joint mating portion blank 10 cooperates with the joint surface of the opposite side. Setting the joint mating portion blank 10 as a solid structure can increase the strength of the joint mating portion blank 10 and ensure that the prosthesis works normally after implantation. The joint mating portion blank 10 is provided with a porous structure layer on the side facing the bone connection portion blank 20. The provision of the porous structure layer can facilitate the growth of the patient's healthy bone into the pore gap, which can ensure the stability of the prosthesis after implantation. The trabecular portion 21 includes a plurality of connecting posts. Specifically, in this embodiment, the number of the connecting posts is three, and the axes of the three connecting posts are arranged in an uneven manner. The three connecting posts are connected to the patient's healthy bone, and the connection effect is good.

[0041] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0043] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0044] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for manufacturing a joint prosthesis, characterized in that: The following steps are involved: A joint fitting part blank (10) and a bone connection part blank (20) are obtained by additive manufacturing, wherein the bone connection part blank (20) includes a trabecular part (21) and a protective shell (22) covering the outside of the trabecular part (21), the thickness of the protective shell (22) is greater than or equal to twice the thickness of the additive manufacturing powder and less than or equal to 3 mm, and the distance between the inner surface of the protective shell (22) and the outer surface of the trabecular part (21) is greater than or equal to twice the thickness of the additive manufacturing powder to form a protective space (23); Performing surface treatment on the joint fitting portion blank (10); The protective shell (22) is removed after the surface treatment of the joint fitting part blank (10) is completed.

2. The manufacturing method according to claim 1, characterized in that The step of performing surface treatment on the joint fitting portion blank (10) comprises: The joint matching portion blank (10) is ground and polished.

3. The manufacturing method according to claim 1, characterized in that Cobalt-chromium-molybdenum powder is used to perform additive manufacturing of the joint matching portion blank (10) and the bone connection portion blank (20).

4. The manufacturing method according to claim 1, characterized in that The step of removing the protective shell (22) comprises: The protective shell is peeled off using clamps.

5. The manufacturing method according to claim 1, characterized in that After the step of removing the protective shell (22), the manufacturing method further comprises: The burrs at the intersection of the joint fitting portion blank (10) and the trabecular portion (21) are removed.

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