CN214857841U

CN214857841U - Wrist joint prosthesis

Info

Publication number: CN214857841U
Application number: CN202021544997.4U
Authority: CN
Inventors: 金旻; 卢凌霄; 常小龙; 辛晨; 刘翔
Original assignee: Shanghai Weiwei Investment Holding Co ltd
Current assignee: Minimally Invasive Investment Holdings Ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2021-11-26
Anticipated expiration: 2030-07-30

Abstract

The utility model relates to a wrist joint prosthesis, wrist joint prosthesis includes wrist bone subassembly and radius subassembly, the wrist bone subassembly with radius subassembly butt makes the wrist bone subassembly can be for the activity of radius subassembly. The utility model provides a radius subassembly includes radius articular surface part, second connecting piece and mounting among the wrist joint false body, and through setting up the mounting on the radius shaft, the second connecting piece passes in the mounting stretches into the radius, is connected with the articular surface part of radius of laminating radius cross-section simultaneously, and it has effectively solved the bone solution and the stress concentration problem that cause because of the radius handle, and its installation that need not consider the radius handle can be the biggest to cover the partial osteotomy face of radius, improves wrist joint false body's stability, prolongs wrist joint false body's life.

Description

Wrist joint prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a wrist joint prosthesis.

Background

In order to deal with the pain, deformity and function loss of the wrist joint caused by various wounds, autoimmune diseases and degenerative diseases, the artificial wrist joint prosthesis is implanted into a human body by adopting a total wrist replacement technique, so that the function of the wrist joint is kept to the maximum extent, and the problem of pain and deformity of a patient is solved.

In the prior art, an artificial wrist joint prosthesis radius assembly is composed of a radius handle and a radius articular surface component, and has the following problems:

when the existing artificial wrist joint prosthesis is implanted, a handle part needs to be directly inserted into a medullary cavity of a radius, so that the radius and the radius handle are mutually embedded. The early-stage loosening of the wrist joint prosthesis may be caused by osteolysis caused by the early micromotion of the radius handle and the stimulation of the absorption of the bone facet by the particles.

Secondly, stress concentration is easily generated at the radius handle, so that bone absorption around the prosthesis is accelerated, the prosthesis is loosened, fatigued and even broken, and the prosthesis is failed.

And (III) the wrist joint prosthesis additionally comprising the handle has the problem of difficult revision.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a wrist prosthesis. Compared with the prior art, the wrist joint prosthesis provided by the utility model can be fixed with the radius without being inserted into the medullary cavity of the radius.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the wrist joint prosthesis comprises a wrist bone assembly and a radius assembly, wherein the wrist bone assembly is abutted to the radius assembly, so that the wrist bone assembly can move relative to the radius assembly.

Furthermore, one surface of the radial assembly, which is abutted against the carpal assembly, is concave, and one surface of the carpal assembly, which is abutted against the radial assembly, is ellipsoidal.

Furthermore, the carpal bone component comprises a carpal bone body and at least one first connecting piece, the first connecting piece is arranged on the carpal bone body, one end of the carpal bone body is connected with the carpal bone of the human body through the first connecting piece, and one end, far away from the first connecting piece, of the carpal bone body is abutted to the radius component.

Furthermore, the carpal bone base is provided with at least one boss, the first connecting piece penetrates through the boss, and at least one recess is formed in the carpal bone joint surface component and used for being in scarf joint with the boss.

Furthermore, the carpal bone base comprises a base body and at least one upright column, the upright column is arranged on one side, away from the carpal bone joint surface component, of the base body, and a first porous structure is arranged at one end, close to the upright column, of the base body.

Further, the coverage area of the first porous structure on the substrate is partial coverage or complete coverage.

Furthermore, the radius subassembly includes radius articular surface part, second connecting piece and mounting, the mounting set up in the radius shaft and with the one end of second connecting piece is connected, the other end of second connecting piece is connected radius articular surface part, radius articular surface part is used for laminating the radius cross-section.

Furthermore, one side of the radial articular surface component facing the fixing component is provided with a second porous structure and at least two mounting holes, and the second porous structure is arranged on one surface of the radial articular surface component provided with the mounting holes.

Further, the other side of the radial articular surface component facing the carpal assembly is concave.

The second porous structure may be partially or completely covered over the area covered by the radial articular surface component.

Further, the first porous structure and the second porous structure comprise a plurality of monomers connected with each other, a plurality of through holes are respectively formed between the monomers and in the monomers, and the aperture of each through hole is 100-1000 μm.

Further, the porosity of the second porous structure is 10-80%.

Compared with the prior art, the utility model discloses a beneficial technological effect as follows:

(one) the utility model provides a radius subassembly includes radius articular surface part, second connecting piece and mounting among the wrist joint false body, through set up the mounting on the radius, the second connecting piece passes in the mounting stretches into the radius, is connected with the articular surface part of radius of laminating radius cross-section simultaneously, and it has effectively solved because of the bone that the radius handle caused dissolves and stress concentration problem, and it need not consider the installation of radius handle, can do the biggest cover to radius part osteotomy face, improves wrist joint false body's stability, prolongs wrist joint false body's life.

(II) the utility model provides an in the wrist joint prosthesis set up porous structure in radius subassembly and wrist bone subassembly respectively, porous structure obtains for the integrated into one piece technique through vibration material disk (shenglvehao) for in the human body and the skeleton of wrist joint prosthesis contact grow into porous structure, realize the long-term stable fixed of wrist joint prosthesis.

(III) after the human skeleton grows into the porous structure, the fixing piece and the second connecting piece can be removed, thereby reducing the weight

The overall weight of the wrist prosthesis is reduced.

Drawings

Fig. 1 shows a schematic structural diagram of a wrist joint prosthesis according to an embodiment of the present invention.

Fig. 2 shows a schematic structural diagram of a carpal assembly in a wrist joint prosthesis according to an embodiment of the present invention.

Fig. 3 shows a schematic structural diagram of a carpal base in a wrist joint prosthesis according to an embodiment of the present invention.

Fig. 4 shows another structural diagram of the carpal bone base in the wrist joint prosthesis according to the embodiment of the present invention.

Fig. 5 shows a schematic view of the wrist joint surface component of a wrist joint prosthesis according to an embodiment of the present invention.

Fig. 6 shows a schematic structural diagram of a locking screw in a wrist joint prosthesis according to an embodiment of the present invention.

Fig. 7 is a schematic diagram illustrating the structure of the radial articular surface component of the radial component of the wrist prosthesis according to an embodiment of the present invention.

Fig. 8 is another schematic diagram of a radial articular surface component of the radial assembly of a wrist prosthesis according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram illustrating a fastening screw in a radius component of a wrist joint prosthesis according to an embodiment of the present invention.

Fig. 10 is a schematic structural view illustrating a fixing member in a radius assembly of a wrist joint prosthesis according to an embodiment of the present invention.

In the drawings, the reference numbers: 10. a carpal assembly; 11. a carpal body; 111. a carpal base; 1111. a substrate; 1112. a column; 1113. a boss; 1114. a first porous structure; 112. a carpal articular surface component; 1121. recessing; 12. a screw; 121. a first stud; 122. a first nut; 20. a radius component; 21. a radial articular surface component; 211. a second porous structure; 212. a fixing hole; 22. a screw; 221. a second stud; 222. a second nut; 23. a fixing member; 231. and (7) installing holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the wrist joint prosthesis according to the present invention will be described in detail with reference to the accompanying drawings and embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, please refer to the attached drawings. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limitation of the implementation of the present invention, so that the present invention does not have the essential significance in the technology, and any modification of the structure, change of the ratio relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention.

Referring to fig. 1, the wrist prosthesis includes a wrist assembly 10 abutting a radius assembly 20, such that the wrist assembly 10 is movable relative to the radius assembly 20.

Referring to fig. 1 and 2, the carpal assembly 10 includes a carpal body 11 and a first connecting member, specifically, the first connecting member is a screw 12, the screw 12 is disposed on the carpal body 11, one end of the carpal body 11 is connected to a wrist of a human body through the screw 12, and one end of the carpal body 11, which is far away from the screw, is abutted to the radius assembly 20.

Further, referring to fig. 2, the carpal body 11 comprises a carpal base 111 and a carpal articular surface component 112, wherein the carpal base 111 is detachably connected to the carpal articular surface component 112.

Specifically, referring to fig. 3, fig. 4 and fig. 5, the carpal bone base 111 has at least one protrusion 1113, the protrusion 1113 is penetrated by the first connecting member 12, and at least one recess 1121 (see fig. 5) is disposed on the carpal bone articular surface component 112 for inserting and connecting the protrusion 1113, preferably, two protrusions 1113 and two recesses 1121 are disposed in the carpal bone base 111 in this embodiment.

Further, referring to fig. 3, the carpal base 111 includes a base 1111 and at least one post 1112, the post 1112 for driving into a metacarpal bone for fixation. The pillar 1112 is disposed on a side of the substrate 1111 away from the wrist articular surface component 112, and a first porous structure 1114 is disposed on an end of the substrate 1111 adjacent to the pillar 1112 and an outer surface of the pillar 1112. Wherein the substrate 1111, the pillar 1112, the boss 1113 and the first porous structure 1114 are integrally formed, wherein the first porous structure 1114 covers the substrate 1111 partially or completely, and in this embodiment, the first porous structure 1114 covers the substrate 1111 partially and covers the pillar 1112 completely.

Further, referring to fig. 1, 2 and 5, the surface of the wrist assembly 10 abutting the radius assembly 20 is ellipsoidal. Specifically, the ellipsoid shape is formed on the inferior surface of the wrist articular surface component 112 for forming an articular cross-section with the radial articular surface component 21. Preferably, in the wrist joint prosthesis provided in this embodiment, the carpal base 111 is made of a titanium alloy material, and the carpal articular surface component 112 is made of a polyethylene polymer material.

Further, referring to fig. 6, the first connecting member is a screw 12, the screw 12 includes a first stud 121 and a first nut 122 connected to each other, a diameter of the first nut 122 increases in a direction away from the first stud 121, and a maximum diameter end of the first nut 122 penetrates into the boss 1113 and plays a role of limiting.

Referring to fig. 1, the following describes a specific structure of the radius assembly 20:

the radius assembly 20 comprises a radius articular surface part 21, a second connecting piece and a fixing piece 23, the fixing piece 23 is arranged on the radius shaft in a plate shape and is connected with one end of the second connecting piece, the other end of the second connecting piece is connected with the radius articular surface part 21, and the radius articular surface part 21 is used for being attached to the radius section.

Further, the surface of the radial component 20 abutting against the carpal component 10 is concave, and specifically the concave surface is disposed on the upper surface of the radial articular surface component 21, and the concave surface is smooth and is used for abutting against the ellipsoidal carpal articular surface component 112. Preferably, the wrist joint prosthesis provided in this embodiment is formed by using cobalt-chromium-molybdenum alloy or titanium alloy as the radial articular surface component 21.

Referring to fig. 7 and 8, the radial articular surface component 21 includes a second porous structure 211 and at least two fixing holes 212, the second porous structure 211 and the fixing holes 212 are integrally formed, and the second porous structure 211 is disposed on the lower surface of the radial articular surface component 21 where the fixing holes 212 are formed. The coverage area of the second porous structure 211 on the radial articular surface component 21 is partially or completely covered, and the second porous structure 211 in this embodiment is completely covered on the radial articular surface component 21.

Referring to fig. 9, the second connecting member is a screw 22, which includes a second stud 221 and a second nut 222 connected to each other, and the diameter of the second nut 222 increases in a direction away from the second stud 221.

At least two mounting holes 231 are formed in the fixing member 23, internal threads are formed in the mounting holes 231 and are used for being in threaded connection with the second stud 221, and the diameter of each mounting hole 231 is larger than the maximum diameter of the second stud 221 and smaller than the minimum diameter of the second nut 222. Preferably, the number of the installation holes 231 in the wrist joint prosthesis provided by this embodiment is two, the number of the installation holes 231 corresponds to the number of the second connecting elements, the fixing member 23 is made of titanium alloy material, and the shape of the fixing member 23 changes with the shape of the radius cross section.

The first porous structure 1114 and the second porous structure 211 comprise a plurality of monomers connected in a disordered manner. The monomer is one of a diamond structure body, a rhombic dodecahedron, a honeycomb structure body, a tetrahedron, a cube and an octahedron, a plurality of through holes are formed among the monomers and inside the monomers, the pore diameter of each through hole is 100-1000 microns, the porosity of the second porous structure 211 is 10-80%, the arrangement of the through holes can enable the first porous structure 1114 and the second porous structure 211 to have a good bone ingrowth effect and long-term stability, and meanwhile, the first porous structure 1114 and the second porous structure 211 to have high roughness and friction coefficients, so that the first porous structure 1114 and the second porous structure 211 have good short-term stability.

Further, the first porous structure 1114 of the carpal base 111 and the second porous structure 211 of the radial articular surface component 21 are fabricated with a solid substrate by additive manufacturing techniques to avoid the problem of easy detachment caused by conventional bone ingrowth coatings.

The wrist bone component 10 is fixedly connected with the wrist bone of the human body by the screw 12 penetrating the boss 1113. After the excision of the lesion part of the radius assembly 20 is completed, the fixing member 23 is firstly erected on the radius shaft, then the screw 22 passes through the mounting hole 231 of the fixing member 23 and extends into the radius, and one end of the screw 22 extending into the radius is in threaded connection with the fixing hole 212 of the radius articular surface component 21 attached to the cross section of the radius, so that the radius assembly 20 is fixed with the radius.

After the wrist joint prosthesis is implanted into a human body, the first porous structure 1114 and the second porous structure 211 are arranged, so that bones in the human body, which are in contact with the wrist joint prosthesis, grow into the first porous structure 1114 and the second porous structure 211, and the long-term stable fixation of the wrist joint prosthesis can be realized. After the human bone grows in, the fixing piece 23 and the screw 22 can be removed optionally, and the whole weight of the wrist joint prosthesis is reduced.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A wrist prosthesis characterized by: the wrist joint prosthesis comprises a wrist bone component (10) and a radius component (20), wherein the wrist bone component (10) is abutted to the radius component (20) so that the wrist bone component (10) can move relative to the radius component (20).

2. The wrist prosthesis of claim 1, wherein the surface of said radial component (20) that abuts said carpal component (10) is concave and the surface of said carpal component (10) that abuts said radial component (20) is ellipsoidal.

3. The wrist joint prosthesis of claim 2, wherein: the wrist bone component (10) comprises a wrist bone body (11) and at least one first connecting piece, the first connecting piece is arranged on the wrist bone body (11), one end of the wrist bone body (11) is connected with the wrist bone of a human body through the first connecting piece, and one end, far away from the first connecting piece, of the wrist bone body (11) is abutted to the radius component (20).

4. The wrist joint prosthesis of claim 3, wherein: the carpal bone body (11) comprises a carpal bone base (111) and a carpal bone joint surface component (112), and the carpal bone base (111) is detachably connected with the carpal bone joint surface component (112); the carpal base (111) has at least one projection (1113), the first connector extends through the projection (1113), and the carpal articular surface member (112) is provided with at least one recess (1121) for engagement with the projection (1113).

5. The wrist joint prosthesis of claim 4, wherein: the carpal base (111) comprises a base body (1111) and at least one upright (1112), the upright (1112) is arranged on the side of the base body (1111) far away from the carpal articular surface component (112), and a first porous structure (1114) is arranged at one end of the base body (1111) close to the upright (1112).

6. The wrist joint prosthesis of claim 5, wherein: the first porous structure (1114) covers an area of the substrate (1111) either partially or completely.

7. The wrist joint prosthesis of claim 5, wherein: the radius subassembly (20) includes radius articular surface part (21), second connecting piece and mounting (23), mounting (23) set up in the radius shaft and with the one end of second connecting piece is connected, radius articular surface part (21) is connected to the other end of second connecting piece, radius articular surface part (21) are used for laminating the radius cross-section.

8. The wrist joint prosthesis of claim 7, wherein: one side of the radial articular surface component (21) facing the fixing piece (23) is provided with a second porous structure (211) and at least two mounting holes (231), and the second porous structure (211) is arranged on one surface of the radial articular surface component (21) provided with the mounting holes (231).

9. The wrist joint prosthesis of claim 8, wherein: the other side of the radial articular surface component (21) facing the wrist bone component (10) is concave.

10. The wrist joint prosthesis of claim 8, wherein: the second porous structure (211) is partially or completely covered over the area covered by the radial articular surface component (21).

11. The wrist joint prosthesis of claim 8, wherein: the first porous structure (1114) and the second porous structure (211) comprise a plurality of monomers which are connected with each other, a plurality of through holes are respectively formed among the monomers and in the monomers, and the aperture of each through hole is 100-1000 μm.

12. The wrist joint prosthesis of claim 10, wherein: the porosity of the second porous structure (211) is 10-80%.