A tantalum wrist prosthesis with a gradient porous structure and a wear-resistant layer

Abstract

The present invention provides a tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer, comprising: a distal implant, a special-shaped ball head, and a proximal implant. The distal implant comprises a distal insertion plug, a proximal platform, and a circular pin. The overall shape of the special-shaped ball head is a small half-notch of an ellipsoid. One end of the special-shaped ball head is provided with a socket that matches the circular pin, so that the distal implant and the special-shaped ball head are plugged and fixed. The other end of the special-shaped ball head is a convex ball structure. The proximal implant comprises a concave joint ball and a gradual porous structure segment. The surface of the concave joint ball is provided with a coating. The coating contacts the surface of the convex ball structure of the special-shaped ball head, so that the proximal implant and the special-shaped ball head are connected to form a compensatory wrist joint. The technical solution of the present invention solves the problems of incomplete coordination between artificial wrist joint prostheses and muscles and soft tissues, severe wear at the joint, and short service life in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial wrist joints, and in particular to a tantalum metal joint prosthesis with a gradual porous structure and a wear-resistant layer. Background Art

[0002] The wrist joint is composed of several small joints, including the radiocarpal joint, the intercarpal joint, and the carpometacarpal joint. These three primary joints (except for the carpometacarpal joint of the thumb) work together to form a wrist joint with a wide range of motion. Specifically, the carpal joint is the joint between the distal radius and the proximal carpal bone row (excluding the pisiform bone), known as the radiocarpal joint.

[0003] The wrist joint is essential for daily and work functions. Its wide range of motion and complex structure make it susceptible to necrosis and injury during daily life. Currently, the primary approach to treating wrist defects is arthrodesis for wrist disorders such as traumatic arthritis, rheumatoid arthritis, and degenerative arthritis. Prosthesis implantation can effectively relieve pain and improve function. However, short-term and long-term fixation issues such as prosthetic loosening, subsidence, fracture, and dislocation remain.

[0004] While a wide variety of artificial implant materials exist, the quality of artificial joints does not fully meet clinical needs, leading to certain limitations in current wrist prostheses. First, the biocompatibility of the materials used is low, increasing the risk of postoperative infection. Second, the prosthesis design and production do not adequately adapt to the physiological curvature of the radius, increasing friction between soft tissue and muscle, and worsening the risk of postoperative complications. Finally, due to incomplete fit and severe wear on the joint surface, the prosthesis lifespan is short. Summary of the Invention

[0005] To address the aforementioned technical issues of incomplete integration of artificial wrist prostheses with muscles and soft tissues, severe wear at the joint, and a short service life, a tantalum metal wrist prosthesis with a gradient porous structure and a wear-resistant layer is provided. This invention primarily utilizes the gradient porous structure of the proximal implant and the wear-resistant coating on the concave surface of the joint ball to improve the service life and stability of the wrist prosthesis and reduce wear. The elliptical, shaped ball head and curved notch are designed to conform to the structure and original curvature of the human wrist joint, enhancing the compatibility of the wrist prosthesis with the human body.

[0006] The technical means adopted in the present invention are as follows:

[0007] A tantalum wrist joint prosthesis with a gradually changing porous structure and a wear-resistant layer, comprising: a distal implant, a special-shaped ball head, and a proximal implant. The distal implant comprises a distal insertion plug, a proximal platform, and a circular pin. The distal insertion plug is located at one end of the proximal platform, and the circular pin is provided at the other end of the proximal platform. The circular pin is provided with a protrusion on the outside.

[0008] The overall shape of the special-shaped ball head is an ellipsoid with a small half-notch. One end of the special-shaped ball head is provided with a socket matching the circular pin, so that the distal implant is plugged and fixed to the special-shaped ball head. The other end of the special-shaped ball head is a convex ball structure.

[0009] The proximal implant includes a concave joint ball and a gradient porous structure segment. The surface of the concave joint ball is provided with a coating, and the coating contacts the surface of the convex ball structure of the special-shaped ball head. The concave joint ball and the convex ball structure cooperate with each other to establish a connection between the proximal implant and the special-shaped ball head to form a compensatory wrist joint.

[0010] Furthermore, the coating is processed by plasma spraying, chemical or physical vapor deposition, friction welding, micro-arc oxidation or laser cladding, the roughness of the coating is 0.001 to 0.1 um, the thickness is 0.2 to 50 mm, and the material of the coating is cobalt alloy, titanium alloy, niobium alloy, or zirconium alloy.

[0011] Furthermore, the distal implant is divided into a joint side and a side in contact with the palm bones according to the joint position. The palm bone contact side includes the distal insertion plug and the top of the proximal platform, and the joint side includes the side and bottom of the proximal platform and the circular pin. The outer surface of the joint side of the distal implant has a smooth outer skin of 0.3 to 0.7 mm. The side of the distal implant in contact with the palm bones is provided with a porous structure. The pore range of the porous structure is 200 to 800 um, the wire diameter is 0.2 to 1.5 mm, and the porosity is 50% to 95%.

[0012] Furthermore, the proximal implant has a through hole near the concave joint ball, and the overall length of the proximal implant is within the size range of the human radius. The ulnar deviation angle of the outer surface of the concave joint ball is 10° to 20°, and the palmar inclination angle is 7° to 15°.

[0013] Furthermore, the porosity of the gradient porous structure segment is 50% to 95%, the wire diameter is 0.2 to 1.5 mm, the thickness of the porous layer in the gradient porous structure segment is 0.25 to 5 mm, and the gradient porous structure segment is divided into a large pore area, a medium pore area and a small pore area in sequence. The large pore area is close to the concave ball part of the joint, and the pore size range of the large pore area is 400 to 1500 um. The tail end of the proximal implant is the small pore area, and the pore size range of the small pore area is 200 to 600 um. The porous layer has a gradual thickness change from the large pore area to the small pore area, ranging from 0.1 to 5 mm, and the length of the gradient porous structure segment is 0.1 to 5 mm.

[0014] Furthermore, it also includes screw I, screw II and screw III;

[0015] The screws 1 cooperate with the screw holes 1 provided on the proximal platform, and the number of the screws 1 and the screw holes 1 is determined according to actual conditions;

[0016] The proximal platform is an elliptical structure with a concave arc surface on the bottom surface. The major and minor axis diameters of the elliptical structure are within the size range of the human wrist joint. The distal insertion bolt is a long cylindrical structure with a screw hole II provided near the proximal platform. The screw II is used in conjunction with the screw hole II.

[0017] The proximal implant is provided with a through hole, and the screw III is used in conjunction with the through hole.

[0018] Furthermore, the proximal implant and the distal implant are made of tantalum or tantalum alloy, and are manufactured using integrated metal additive manufacturing technology.

[0019] Furthermore, the tantalum metal wrist joint prosthesis with a gradient porous structure and a wear-resistant layer can be distinguished between the left hand and the right hand.

[0020] Furthermore, the types of the gradient porous structure and the porous structure include one or both of a repeating unit cell type and a non-repeating unit cell type.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention provides a tantalum metal wrist joint prosthesis with a gradient porous structure and a wear-resistant layer. Through the porous structure provided on the distal implant and the gradient porous structure provided on the proximal implant, the small pore size portion provides conditions for bone ingrowth, thereby increasing the stability between the wrist joint prosthesis and the bone. The large pore size portion achieves lightweight without affecting the mechanical strength, and the gradient porous structure makes the wrist joint prosthesis free of stress concentration.

[0023] 2. The present invention provides a tantalum metal wrist joint prosthesis with a gradient porous structure and a wear-resistant layer. By designing an elliptical special-shaped ball head and an arc-shaped notch, it fits the structure of the human wrist joint and the original surface curvature, thereby increasing the adaptability of the wrist joint prosthesis to the human body, reducing the complexity of the prosthesis, and improving its service life.

[0024] 3. The present invention provides a tantalum metal wrist joint prosthesis with a gradient porous structure and a wear-resistant layer. By adding a wear-resistant metal coating on the surface of the concave ball of the joint, the wear resistance of the joint surface is greatly enhanced, while the possibility of debris falling from the joint surface due to wear is reduced, thereby further extending the service life of the wrist joint prosthesis.

[0025] Based on the above reasons, the present invention can be widely promoted in the fields of artificial wrist joints and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 labor.

[0027] Figure 1 This is an exploded view of the overall structure of the tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer described in the present invention.

[0028] Figure 2 This is a structural diagram of the tantalum metal wrist joint distal implant with a gradient porous structure and a wear-resistant layer as described in the present invention.

[0029] Figure 3 This is a structural diagram of the tantalum metal wrist joint special-shaped ball head with a gradual porous structure and a wear-resistant layer described in the present invention.

[0030] Figure 4 This is a structural diagram of the tantalum metal wrist joint proximal implant with a gradient porous structure and a wear-resistant layer described in the present invention.

[0031] In the figure: 10, distal implant; 11, distal insertion plug; 12, proximal platform; 13, porous structure; 14, round pin; 15, screw hole II; 20, special-shaped ball head; 21, arc-surface notch; 22, socket; 30, proximal implant; 31, joint concave ball; 32, through hole; 33, large aperture area; 34, medium aperture area; 35, small aperture area; 40, screw I. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described 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, not all of 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 work are within the scope of protection of the present invention.

[0034] 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 invention. As used herein, unless the context clearly indicates otherwise, the singular form is 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.

[0035] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear 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 ordinary technicians in the relevant fields 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 value should be interpreted as merely exemplary and not as a limitation. 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, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0036] 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, vertical, 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.

[0037] 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 their position 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.

[0038] 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.

[0039] Example 1

[0040] like Figures 1 to 4 As shown, the present invention provides a tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer, comprising: a distal implant 10, a special-shaped ball head 20, and a proximal implant 30. The distal implant 10 comprises a distal insertion plug 11, a proximal platform 12, and a circular pin 14. The distal insertion plug 11 is located at one end of the proximal platform 12, and the circular pin 14 is provided at the other end of the proximal platform 12. The circular pin 14 is provided with a protrusion on the outside.

[0041] One end of the special-shaped ball head 20 is provided with a socket 22, and the other end is a convex ball structure, and the socket 22 matches the round pin 14, so that the distal implant 10 is plugged and fixed with the special-shaped ball head 20;

[0042] The proximal implant 30 includes a concave joint ball 31 and a gradient porous structure segment. The surface of the concave joint ball 31 is provided with a coating, which is a smooth solid structure. The coating contacts the surface of the convex ball structure of the special-shaped ball head 20. The concave joint ball 31 and the convex ball structure cooperate with each other to establish a connection between the proximal implant 30 and the special-shaped ball head 20 to form a compensatory wrist joint.

[0043] The pore size of the gradual porous structure segment gradually decreases from the joint concave ball 31 to the tail end, which is a large pore area 33, a medium pore area 34 and a small pore area 35. The pore size range of the large pore area 33 is 400-1500um, and the pore size range of the small pore area 35 is 200-600um. The porosity requirement of the gradual porous structure segment is 50%-95%, the wire diameter is 0.2-1.5mm, the thickness of the porous layer in the gradual porous structure segment is 0.25-5mm, and the porous layer has a gradual thickness change from the large pore area to the small pore area, ranging from 0.1-5mm, and the distance of the gradual porous structure segment is 0.1-5mm.

[0044] The portion with small pore size and thin wire diameter in the gradient porous structure segment meets the requirements of bone ingrowth and establishes a long-term stable fixation structure, while the portion with large pore size and thick wire diameter can achieve both lightweight and high mechanical strength.

[0045] Furthermore, the coating is processed by ion spraying, chemical or physical vapor deposition, friction welding, micro-arc oxidation or laser cladding, the roughness of the coating is 0.001~0.1um, the thickness is 0.2~50mm, and the material of the coating is medical wear-resistant metal materials such as cobalt alloy, titanium alloy, niobium alloy, zirconium alloy, etc.

[0046] The coating is used to increase the wear resistance of the joint concave ball 31 and prevent the joint concave ball 31 from dropping debris, which affects the service life.

[0047] Furthermore, the distal implant 10 can be divided into a joint side and a side in contact with the palm bones according to the joint position. The palm bone contact side includes the distal insertion plug 11 and the top of the proximal platform 12. The joint side is a solid structure, including the side and bottom of the proximal platform 12 and the circular pin 14. The outer surface of the joint side of the distal implant 10 has a smooth outer skin of 0.3 to 0.7 mm. The side of the distal implant 10 in contact with the palm bones is provided with a porous structure 13. The pore range of the porous structure 13 is 200 to 800 um, and the porosity is 50% to 95%.

[0048] The smooth outer skin is used to ensure smooth contact between the distal implant 10 and soft tissue, and the porous structure 13 forms a biological fixation with the bone to increase the stability in use.

[0049] Furthermore, the proximal platform 12 is an elliptical structure and a concave arc surface is provided on the bottom surface. The major and minor axis diameters of the elliptical structure are within the size range of the human wrist joint. The distal insertion plug 11 is a long cylindrical structure and a screw hole II 15 is provided near the proximal platform 12. The screw hole II 15 is used in conjunction with the screw II.

[0050] The concave arcuate surface is used for placing hand tendons such as the flexor digitorum profundus tendon.

[0051] Furthermore, the proximal implant 30 has a through hole 32 near the concave joint ball 31, and the overall length of the proximal implant 30 is within the size range of the human radius. The ulnar deviation angle of the outer surface of the concave joint ball 31 is 10° to 20°, and the palmar inclination angle is 7° to 15°.

[0052] Furthermore, it also includes screws I 40, which cooperate with the screw holes I set on the proximal platform 12. The number of the screws I 40 and the screw holes I is determined according to actual conditions.

[0053] Furthermore, the proximal implant 30 and the distal implant 10 are made of tantalum or tantalum alloy, and are manufactured using metal additive manufacturing technology for integrated manufacturing.

[0054] Furthermore, the tantalum metal wrist joint prosthesis with a gradient porous structure and a wear-resistant layer can be distinguished between the left hand and the right hand.

[0055] Furthermore, an arc-surface notch 21 is provided on the special-shaped ball head 20 , and the material of the special-shaped ball head 20 is highly cross-linked polyethylene.

[0056] Furthermore, the types of the gradient porous structure and the porous structure include one or both of a repeating unit cell type and a non-repeating unit cell type.

[0057] A method for implanting a tantalum metal wrist joint prosthesis with a gradually porous structure and a wear-resistant layer in a human body: the distal insertion plug 11 is sequentially inserted into the capitate bone and the third metacarpal bone, and the distal insertion plug 11 is fixed to the bone by passing the screw II through the screw hole II 15. The screw I 40 is inserted into the hamate bone and the fourth metacarpal bone for fixation. The gradually porous structure segment is inserted into the distal end of the tibia, and the proximal implant 30 is fixed by using the screw III through the through hole 32.

[0058] Example 2

[0059] Based on Example 1, this example provides a solution as follows:

[0060] The pore size in the small pore area 35 is 200 μm, the porosity is 50%, and the wire diameter is 1.5 mm. The pore size in the large pore area 33 is 400 μm, the porosity is 50%, and the wire diameter is 0.9 mm. The overall thickness of the porous layer is 5 mm, and the gradient thickness is 0.1 mm.

[0061] The coating has a thickness of 0.2 mm and a roughness of 0.1 mm, and is made of cobalt-chromium-molybdenum alloy. The coating is applied to the surface of the concave joint ball 31 by plasma spraying technology.

[0062] The porous structure 13 has a pore size of 200 μm, a porosity of 50%, and a wire diameter of 1.5 mm;

[0063] The thickness of the outer skin is 0.3 mm;

[0064] The ulnar deflection angle of the outer surface of the concave joint ball 31 is 10°, and the palmar inclination angle is 15°;

[0065] The distal implant 10 and the proximal implant 30 are both made of tantalum and tantalum alloy, and are manufactured using metal 3D printing technology;

[0066] The special-shaped ball head 20 is made of highly cross-linked polyethylene;

[0067] The number of the screws 1 40 is two.

[0068] The method of implanting the tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer described in this embodiment into the human body is as follows: the distal insertion plug 11 is sequentially inserted into the capitate bone and the third metacarpal bone, and the distal insertion plug 11 is fixed to the bone by passing the screw II through the screw hole II 15, one of the screws I 40 is fixed to the second metacarpal bone, and the other screw I 40 is inserted into the hamate bone and the fourth metacarpal bone for fixation, the gradual porous structure segment is inserted into the distal end of the tibia, and the proximal implant 30 is fixed by using the screw III through the through hole 32.

[0069] Example 3

[0070] Compared with Example 2, the difference of this embodiment is:

[0071] The pore size in the small pore area 35 is 600 μm, the porosity is 95%, and the wire diameter is 0.7 mm. The pore size in the large pore area 33 is 1500 μm, the porosity is 95%, and the wire diameter is 0.2 mm. The overall thickness of the porous layer is 0.25 mm, and the gradient thickness is 5 mm.

[0072] The coating has a thickness of 50 mm and a roughness of 0.001 mm, and is made of zirconium alloy. The coating is covered on the surface of the concave joint ball by micro-arc oxidation technology;

[0073] The porous structure 13 has a pore size of 600 μm, a porosity of 95%, and a wire diameter of 0.7 mm;

[0074] The ulnar deflection angle of the outer surface of the concave joint ball 31 is 20°, and the palmar inclination angle is 7°;

[0075] The number of the screws 1 40 is three.

[0076] The connection method of the tantalum metal wrist joint prosthesis with a wear-resistant layer described in this embodiment is as follows: the distal insertion plug 11 is inserted into the capitate bone and the third metacarpal bone in sequence, and the distal insertion plug 11 is fixed to the bone using a screw II inserted into the screw hole II 15. The three screws I 40 are fixed to the second metacarpal bone, the fourth metacarpal bone and the fifth metacarpal bone respectively. The gradient porous structure segment is inserted into the distal end of the tibia, and the proximal implant 30 is fixed using a screw III through the through hole 32.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with 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 embodiments of the present invention.

Claims

1. A tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer, characterized in that: include: A distal implant, a special-shaped ball head, and a proximal implant. The distal implant includes a distal insertion plug, a proximal platform, and a circular pin. The distal insertion plug is located at one end of the proximal platform, and the circular pin is provided at the other end of the proximal platform. A protrusion is provided on the outside of the circular pin. The overall shape of the special-shaped ball head is an ellipsoid with a small half-notch. One end of the special-shaped ball head is provided with a socket matching the circular pin, so that the distal implant is plugged and fixed to the special-shaped ball head. The other end of the special-shaped ball head is a convex ball structure. The proximal implant comprises a concave joint ball and a gradient porous structure segment. The surface of the concave joint ball is provided with a coating, and the coating contacts the surface of the convex ball structure of the special-shaped ball head. The concave joint ball and the convex ball structure cooperate with each other to establish a connection between the proximal implant and the special-shaped ball head to form a compensatory wrist joint. The distal implant is divided into a joint side and a palmar bone contact side according to the joint site. The palmar bone contact side includes the distal insertion plug and the top of the proximal platform. The joint side includes the side and bottom of the proximal platform and the circular pin. The outer surface of the joint side of the distal implant has a smooth outer skin of 0.3 to 0.7 mm. The palmar bone contact side of the distal implant is provided with a porous structure. The porous structure has a pore range of 200 to 800 μm, a wire diameter of 0.2 to 1.5 mm, and a porosity of 50% to 95%. The porosity of the gradient porous structure segment is 50% to 95%, the wire diameter is 0.2 to 1.5 mm, the thickness of the porous layer of the gradient porous structure segment is 0.25 to 5 mm, the gradient porous structure segment is divided into a large pore area, a medium pore area and a small pore area in sequence, the large pore area close to the concave joint ball portion is in the range of 400 to 1500 μm, the proximal implant tail end is in the range of 200 to 600 μm, the gradient porous structure segment has a gradual thickness change from the large pore area to the small pore area, in the range of 0.1 to 5 mm, and the length of the gradient porous structure segment is 0.1 to 5 mm; The types of the gradient porous structure and the porous structure include one or both of a repeating unit cell type and a non-repeating unit cell type; The proximal implant has a through hole near the concave joint ball, and the overall length of the proximal implant is within the size range of the human radius. The ulnar deviation angle of the extended surface of the concave joint ball is 10° to 20°, and the palmar inclination angle is 7° to 15°.

2. The tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer according to claim 1, characterized in that: The coating is processed by plasma spraying, chemical or physical vapor deposition, friction welding, micro-arc oxidation or laser cladding. The roughness of the coating is 0.001 to 0.1 um, and the thickness is 0.2 to 50 mm. The material of the coating is cobalt alloy, titanium alloy, niobium alloy, or zirconium alloy.

3. The tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer according to claim 1, characterized in that: Also included are screw I, screw II, and screw III; The screws 1 cooperate with the screw holes 1 provided on the proximal platform, and the number of the screws 1 and the screw holes 1 is determined according to actual conditions; The proximal platform is an elliptical structure with a concave arc surface on the bottom surface. The major and minor axis diameters of the elliptical structure are within the size range of the human wrist joint. The distal insertion bolt is a long cylindrical structure with a screw hole II provided near the proximal platform. The screw II is used in conjunction with the screw hole II. The proximal implant is provided with a through hole, and the screw III is used in conjunction with the through hole.

4. The tantalum metal wrist joint prosthesis with a gradual porous structure and a wear-resistant layer according to claim 1, characterized in that: The proximal implant and the distal implant are made of tantalum or tantalum alloy, and are manufactured using integrated metal additive manufacturing technology.

5. The tantalum wrist joint prosthesis with a gradient porous structure and a wear-resistant layer according to claim 1, characterized in that: The tantalum metal wrist joint prosthesis with a gradient porous structure and a wear-resistant layer is distinguished between the left hand and the right hand.

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