CN113332006A

CN113332006A - Shoulder joint prosthesis

Info

Publication number: CN113332006A
Application number: CN202110707654.8A
Authority: CN
Inventors: 王彩梅; 李志疆
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-09-03
Also published as: CN217987804U

Abstract

The invention provides a shoulder joint prosthesis comprising: the ball head structure comprises a segment main body and a first connecting structure connected to the segment main body, wherein the first connecting structure comprises a first fastener, and the height H of the segment main body is greater than the radius R of the segment main body; the cushion body assembly comprises a cushion body main body and a second connecting structure connected to the cushion body main body, the cushion body main body is in contact fit with the outer surface of the ball gap main body, and the second connecting structure comprises a second fastening piece. The technical scheme of the application effectively solves the problem that positive shoulder joint prostheses and reverse shoulder joint prostheses in the related technology cannot meet the requirement on universality.

Description

Shoulder joint prosthesis

Technical Field

The invention relates to the field of medical instruments, in particular to a shoulder joint prosthesis.

Background

The shoulder joint is composed of a glenoid of a scapula and a humeral head, and belongs to a ball-and-socket joint. Because the humeral head is large and spherical, surrounding only 1/3 of the humeral head, the joint capsule is thin and flaccid. Therefore, the shoulder joint is the most flexible joint with the largest range of motion, and can do anteflexion, retroflexion, adduction, abduction, internal rotation, external rotation, circumgyration and the like.

Shoulder joint replacement is required for patients with humeral head necrosis, severely comminuted proximal humeral fracture, and glenohumeral arthritis.

In the case where damage is severe at different parts of the shoulder joint, the related art provides two kinds of shoulder joint prostheses. One is the relevant content of the positive shoulder joint prosthesis used when severe injury occurs at the humeral head position, such as the shoulder joint prosthesis disclosed in chinese patent application publication No. CN110368144A, and the other is the negative shoulder joint prosthesis used when severe injury occurs at the rotator cuff, such as the reverse artificial shoulder joint prosthesis disclosed in chinese patent application publication No. CN107184293A, so that the two shoulder joint prostheses are prepared for convenient surgical use.

However, the above-mentioned shoulder joint prosthesis and reverse shoulder joint prosthesis both have humerus handles, when the humerus handle is implanted, the humerus head needs to be cut off, the long humerus handle is inserted into the humerus medullary cavity to ensure the fixation of the shoulder joint prosthesis or reverse shoulder joint prosthesis, which causes secondary damage to the humerus of the human body, and the parts of the humerus ends and the glenoid ends of the shoulder joint prosthesis and reverse shoulder joint prosthesis fixed inside the bone cannot be exchanged for use, so that the two prostheses cannot meet the requirement of universality, resulting in many components of the shoulder joint prosthesis and reverse shoulder joint prosthesis, each prosthesis has a complex design, a large stock quantity, and a complex operation.

Disclosure of Invention

The invention mainly aims to provide a shoulder joint prosthesis, which aims to solve the problem that positive shoulder joint prostheses and negative shoulder joint prostheses in the related art cannot meet the requirement of universality.

In order to achieve the above object, the present invention provides a shoulder joint prosthesis comprising: the ball head structure comprises a segment main body and a first connecting structure connected to the segment main body, wherein the first connecting structure comprises a first fastener, and the height H of the segment main body is greater than the radius R of the segment main body; the cushion body assembly comprises a cushion body main body and a second connecting structure connected to the cushion body main body, the cushion body main body is in contact fit with the outer surface of the ball gap main body, and the second connecting structure comprises a second fastening piece.

Furthermore, the first connecting structure further comprises a first support piece positioned on one side of the bottom surface of the segment main body and a connecting column connected between the segment main body and the first support piece, and the first connecting structure penetrates through the first support piece.

Furthermore, one end of the connecting column is in interference fit with the segment main body, the other end of the connecting column is in interference fit with the first support piece, and a filling block is arranged at one end, far away from the segment main body, of the first support piece.

Further, the outer surface of the shim block includes an arcuate surface.

Furthermore, the outer surface of the filling block also comprises an inclined plane connected with the arc-shaped surface, a longitudinal section is formed on the first support piece and passes through the filling block, the filling block is of a symmetrical structure taking the longitudinal section as a symmetrical plane, the arc-shaped surface and the inclined plane form an included angle a on the longitudinal section, and the included angle a is an acute angle.

Furthermore, first connection structure still includes the spliced pole of connection on the section of sphere main part and first support, the one end and the section of sphere main part interference fit of spliced pole, the other end and the first support interference fit of spliced pole.

Further, first support piece includes first support column and connects the first annular dish on first support column, fills the piece and connects on first annular dish, is provided with first connecting hole in the segment main part, and the one end of spliced pole is worn to establish in first connecting hole, is provided with the second connecting hole on the first support column, and the other end of spliced pole is worn to establish in the second connecting hole.

Further, the second connecting hole includes first hole section and the second hole section that communicates with first hole section, the diameter of first hole section is greater than the diameter of second hole section, form the changeover portion between first hole section and the second hole section, first fastener includes a plurality of first screws, the spiral shell head of a first screw is worn to establish in the changeover portion, the one end of spliced pole is first round platform, the other end of spliced pole is the second round platform, first connecting hole include with first round platform complex first conical surface, first hole section include with second round platform complex second conical surface.

Furthermore, an avoiding concave cavity for avoiding the first supporting piece is arranged on the bottom surface of the segment main body, and a space is arranged between the surface of the first supporting piece and the wall of the avoiding concave cavity.

Furthermore, the second connecting structure also comprises a second supporting piece connected to the cushion body main body and a wing plate vertically arranged on the second supporting piece, and the second fastener is arranged on the second supporting piece in a penetrating mode.

Further, the second supporting piece comprises a second supporting column and a second annular disc connected to the second supporting column, the wing plate is connected to the second supporting column and the second annular disc, the second fastening piece comprises a plurality of second screws, and one second screw is connected to the second supporting column.

Furthermore, the second annular disc is connected to the cushion body main body through a clamping structure.

Applying the technical scheme of the invention, the shoulder joint prosthesis comprises: ball head structure and pad body subassembly. The ball head structure comprises a ball segment main body and a first connecting structure connected to the ball segment main body, wherein the first connecting structure comprises a first fastener. Wherein, the height H of the segment main body is larger than the radius R of the segment main body. The cushion body assembly comprises a cushion body main body and a second connecting structure connected to the cushion body main body. The cushion body main body is in contact fit with the outer surface of the ball section main body, and the second connecting structure comprises a second fastener. When the humerus head part is seriously damaged or the rotator cuff part is seriously damaged, the first fastening piece of the ball head structure can be implanted into the humerus head of the human body, the cushion body main body is implanted into the shoulder pelvis of the human body, the second fastening piece of the cushion body assembly is implanted into the scapula of the human body, so that the ball gap main body is in contact fit with the cushion body main body, and the shoulder joint prosthesis realizes the positive shoulder fixation; the second fastener of the cushion body component can also be implanted into the humeral head of a human body, the first fastener of the ball head structure is implanted into the scapula of the human body, and the segment main body is implanted into the glenoid of the human body, so that the segment main body is in contact fit with the cushion body main body, and the shoulder joint prosthesis realizes reverse shoulder fixation. Therefore, the humerus bone of a human body can be reserved to a greater extent due to the fact that the humerus handle is not arranged in the shoulder joint prosthesis, after the shoulder joint prosthesis is implanted, the medullary cavity of the human body is not damaged, under the condition that damage to different parts of a shoulder joint is serious, the front shoulder and the back shoulder can be randomly selected to be used through one set of shoulder joint prosthesis and exchanged, the requirement for universality is met, flexibility of an operation can be increased through the same set of shoulder joint prosthesis, operation operations more suitable for students in the operation can be conveniently conducted, and stock quantity of the shoulder joint prosthesis in the related technology is reduced. Therefore, the technical scheme of the application effectively solves the problem that the positive shoulder joint prosthesis and the negative shoulder joint prosthesis in the related technology cannot meet the requirement on universality.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a perspective view of a ball head structure above a cushion body assembly of an embodiment of a shoulder joint prosthesis according to the present invention;

FIG. 2 is a perspective view of the shoulder joint prosthesis of FIG. 1 from a perspective removed from the pad body;

FIG. 3 is a perspective view of the shoulder joint prosthesis of FIG. 1 from another perspective with the pad body removed;

FIG. 4 shows a cross-sectional schematic view of a ball head structure of the shoulder joint prosthesis of FIG. 1;

FIG. 5 shows a schematic top view of the ball head structure of FIG. 4;

FIG. 6 shows a cross-sectional view of the ball head structure of FIG. 4 with the segment body removed;

FIG. 7 illustrates a perspective view of the first tray and shim of FIG. 4;

FIG. 8 shows a schematic cross-sectional view of the first pallet and shim of FIG. 7 cut from a longitudinal cross-sectional plane;

FIG. 9 shows a perspective view of the first bracket, shim and connecting stud of FIG. 4;

FIG. 10 shows a perspective view of the ball head structure of FIG. 4;

FIG. 11 shows a cross-sectional schematic view of the ball head structure of FIG. 10;

FIG. 12 shows a cross-sectional schematic view of a bolster assembly of the shoulder joint prosthesis of FIG. 1;

FIG. 13 is a schematic perspective view of the pad assembly of FIG. 12 with the pad body removed;

FIG. 14 shows a schematic cross-sectional view of the second tray and wing of FIG. 12;

FIG. 15 shows a schematic perspective view of the pad body of FIG. 12;

FIG. 16 shows a schematic perspective view of another angle of the pad body of FIG. 12;

FIG. 17 shows a cross-sectional schematic view of the pad body of FIG. 16; and

FIG. 18 illustrates a perspective view of the pad assembly of the shoulder joint prosthesis of FIG. 1 positioned over the ball head structure.

Wherein the figures include the following reference numerals:

10. a ball head structure; 11. a segment body; 111. a first connection hole; 112. avoiding the concave cavity; 12. a first fastener; 13. a first holder; 131. a first support column; 132. a first annular disc; 133. a second connection hole; 1331. a first bore section; 1332. a second bore section; 1333. a transition section; 14. filling and supplementing blocks; 141. an arc-shaped surface; 142. a bevel; 15. connecting columns; 151. a first circular table; 152. a second circular table; 20. a cushion body assembly; 21. a cushion body; 22. a second fastener; 23. a second holder; 231. a second support column; 2311. a taper hole; 232. a second annular disc; 24. a wing plate; 30. a clamping structure; 31. a first hook; 32. a second hook.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 to 3 and fig. 18, the shoulder joint prosthesis of the present embodiment includes: a ball head structure 10 and a cushion assembly 20. The ball head structure 10 includes a segment main body 11 and a first connection structure connected to the segment main body 11, the first connection structure including a first fastening member 12. Wherein, the height H of the segment body 11 is larger than the radius R of the segment body 11. The cushion body assembly 20 comprises a cushion body main body 21 and a second connecting structure connected to the cushion body main body 21. The pad body main body 21 is in contact fit with the outer surface of the segment main body 11, and the second connecting structure comprises a second fastening piece 22.

By applying the technical scheme of the embodiment, when the humerus head part is seriously damaged or the rotator cuff part is seriously damaged, the first fastening piece 12 of the ball head structure 10 can be implanted into the humerus head of the human body, the second fastening piece 22 of the cushion body assembly 20 can be implanted into the scapula of the human body, the cushion body main body 21 is implanted into the pelvis of the human body, so that the segment main body 11 is in contact fit with the cushion body main body 21, and the shoulder joint prosthesis realizes shoulder correction fixation; the second fastening member 22 of the cushion body assembly 20 can also be implanted into the humeral head of the human body, the first fastening member 12 of the ball head structure 10 can be implanted into the scapula of the human body, and the segment main body 11 can be implanted into the glenoid of the human body, so that the segment main body 11 is in contact fit with the cushion body main body 21, and the shoulder joint prosthesis can realize reverse shoulder fixation. Therefore, the shoulder joint prosthesis of the embodiment has no humerus handle, humerus bone of a human body can be reserved to a greater extent, after the shoulder joint prosthesis of the embodiment is implanted, the medullary cavity of the human body is not damaged, under the condition that different parts of a shoulder joint are seriously damaged, the front shoulder and the back shoulder can be randomly selected to be used by only one set of shoulder joint prosthesis for exchange, the requirement on universality is met, the flexibility of an operation can be increased by the same set of shoulder joint prosthesis, the shoulder joint prosthesis is convenient for doctors in the operation to perform more appropriate operation, and the stock quantity of the shoulder joint prosthesis in the related technology is reduced. In addition, the eccentric femoral heads with various specifications and forms in the related technology are not needed for adaptation, so that the difficulty of the operation is greatly reduced. Therefore, the technical scheme of the embodiment effectively solves the problem that the positive shoulder joint prosthesis and the negative shoulder joint prosthesis in the related art cannot meet the requirement of universality. Because the height H of the segment main body 11 is larger than the radius R of the segment main body 11, the mobility of the joint surface is increased.

The first fastener 12 and the second fastener 22 of the embodiment enable the shoulder joint prosthesis structure to be free of humeral stem, and the shoulder joint prosthesis without humeral stem can be used for surface replacement to replace the prosthesis with humeral stem in the related art to achieve fixation, so that the medullary cavity of a human body is not invaded, bone is retained, and a better shoulder joint replacement effect is achieved.

The inventors have found that in shoulder joints, when the glenoid defect is severe, i.e. greater than 25% of the glenoid bone defect of the scapula of the shoulder joint is generally required to be treated as a bone defect, the glenoid is too small, the shoulder joint prosthesis is difficult to fix, and effective replacement cannot be achieved. In order to solve the above problem, in this embodiment, as shown in fig. 1 to 8, the first connecting structure further includes a first supporting piece 13 located on one side of the bottom surface of the segment main body 11 and a connecting column 15 connected between the segment main body 11 and the first supporting piece 13, the first connecting structure is disposed on the first supporting piece 13 in a penetrating manner, and a filling block 14 is disposed at one end of the first supporting piece 13, which is far away from the segment main body 11. Thus, after the first fastener 12 of the ball head structure 10 is implanted into the scapula of the human body, the filling block 14 can fill the defect of the glenoid, can supplement the width of the articular surface, avoid the glenoid from being too small, increase the contact area between the glenoid and the ball head structure 10, facilitate the fixation of the shoulder joint prosthesis and facilitate the replacement of the shoulder joint prosthesis.

As shown in fig. 2, 6-8, the outer surface of the patch 14 includes an arcuate surface 141. Thus, the filling block 14 of the arc-shaped surface 141 can be adapted to the arc-shaped surface of the humeral head, and meanwhile, the filling block 14 can be attached to the side wall of the shoulder pelvis, so that the defect of the shoulder pelvis in the width direction is overcome, and the possibility of bone defect on one side of the shoulder pelvis after the shoulder pelvis is wounded is reduced.

As shown in fig. 2, 6-8, the outer surface of the patch 14 further includes a sloped surface 142 connected to the arcuate surface 141. A longitudinal cutting plane is made in the first holder 13, which passes through the filling block 14. The filling block 14 has a symmetrical structure with a longitudinal section as a symmetrical plane, and the arc-shaped surface 141 and the inclined surface 142 form an included angle a on the longitudinal section, where the included angle a is an acute angle. Thus, on the premise of ensuring that the filling block 14 can be attached to the side wall of the shoulder cavity, the included angle a formed by the arc-shaped surface 141 and the inclined surface 142 on the longitudinal section plane can simulate the shape of the side wall of the shoulder cavity, and can be effectively adapted to the arc-shaped surface of the humeral head. In addition, in the case of implanting the first fastening member 12 of the ball head structure 10 into the humeral head of the human body, since the included angle a is an acute angle, the padding block 14 is conveniently pressed into the humeral head directly, the padding block 14 can become a part of the humeral head to support the first support 13, and thus the ball head structure 10 is convenient to support the cushion assembly 20.

As shown in fig. 4 to 8, in order to connect the segment main body 11 and the first holder 13 together, the first connecting structure further includes a connecting post 15 connected to the segment main body 11 and the first holder 13. One end of the connecting column 15 is in interference fit with the segment main body 11, and the other end of the connecting column 15 is in interference fit with the first support piece 13. Thus, one end of the connecting column 15 is tightly fixed with the segment body 11, and the other end of the connecting column 15 is tightly fixed with the first support piece 13, so that the segment body 11 and the first support piece 13 are fixed together. Preferably, the first tray 13 and the filling block 14 are integrally formed by 3D printing.

As shown in fig. 4 to 8, the first holder 13 includes a first support column 131 and a first annular disc 132 attached to the first support column 131. The filling block 14 is connected on the first annular disc 132, the segment main body 11 is provided with a first connecting hole 111, one end of the connecting column 15 is arranged in the first connecting hole 111 in a penetrating manner, the first supporting column 131 is provided with a second connecting hole 133, and the other end of the connecting column 15 is arranged in the second connecting hole 133 in a penetrating manner. The first annular disc 132 is provided with a sufficient bearing area, and the first support column 131 can support the first annular disc 132 and reinforce the structural strength of the first annular disc 132, so that the first retainer 13 can effectively support the segment body 11. The first fastening piece 12 can penetrate out of the second connecting hole 133, and the connecting column 15 can block the second connecting hole 133, so that the first fastening piece 12 is prevented from being separated from the second connecting hole 133, the first fastening piece 12 is convenient to fix, and the fixing effect of the first fastening piece 12 is ensured. Specifically, the first connecting hole 111 is located at the center of the segment body 11, and the second connecting hole 133 is located at the center of the first support 13, so as to ensure that the connecting post 15 can stably connect the first support 13 and the segment body 11, and facilitate the implantation of the first fastener 12 into the humeral head or the scapula of the human body with uniform stress, thereby improving the stability of connection.

As shown in fig. 4 to 8, the second connection hole 133 includes a first hole section 1331 and a second hole section 1332 communicated with the first hole section 1331, a diameter of the first hole section 1331 is larger than a diameter of the second hole section 1332, a transition section 1333 is formed between the first hole section 1331 and the second hole section 1332, the first fastening member 12 includes a plurality of first screws, and a head of one first screw is inserted into the transition section 1333. In this way, the transition section 1333 can receive the head of the first screw and the second bore section 1332 can receive the threaded section of the first screw. One end of the connecting column 15 is a first circular truncated cone 151, the other end of the connecting column 15 is a second circular truncated cone 152, the first connecting hole 111 comprises a first conical surface matched with the first circular truncated cone 151, and the first hole section 1331 comprises a second conical surface matched with the second circular truncated cone 152. Therefore, the second connecting holes 133 are designed to facilitate installation of the first screws and the connecting column 15, and the second connecting holes 133 can achieve multiple functions, so that the shoulder joint prosthesis is compact in structure. In the process that the two ends of the connecting column 15 are respectively arranged in the first connecting hole 111 and the second connecting hole 133, the first round platform 151 and the first conical surface are matched with each other in the radial direction of the first round platform 151, so that the first round platform can be randomly and rotationally arranged, the second round platform 152 and the second conical surface are matched with each other in the radial direction of the second round platform 152, so that the second round platform can be randomly and rotationally arranged, the installation is flexible, and the installation efficiency is improved. Specifically, the first screws include three peripheral first screws and a central first screw located at the center of the three peripheral first screws, and the central first screw and the three peripheral first screws are matched with each other to realize stable near-term and long-term fixation of the ball head structure 10.

As shown in fig. 4 to 11, an avoidance concave cavity 112 for avoiding the first support member 13 is provided on the bottom surface of the segment main body 11, and a space is provided between the surface of the first support member 13 and the cavity wall of the avoidance concave cavity 112. Thus, a part of the first support piece 13 sinks into the avoidance concave cavity 112, and the bottom surface of the segment main body 11 can wrap the part of the first support piece 13, so that the segment main body 11 has a large movable surface, and the movable space can be fully utilized. Because the surface of first support piece 13 and the chamber wall of dodging cavity 112 have the interval between for segment main part 11 and first support piece 13 contactless, segment main part 11 can not be to first support piece 13 application of force, make segment main part 11 only realize being connected through spliced pole 15 and first support piece 13, guarantee the stability that spliced pole 15 is connected, also can avoid the manufacturing error of segment main part 11 and first support piece 13 to influence the stability that spliced pole 15 is connected simultaneously.

As shown in fig. 12 to 14, the second connecting structure further includes a second bracket 23 connected to the pad body 21 and a wing plate 24 vertically arranged on the second bracket 23, and the second fastening member 22 is inserted into the second bracket 23. The wing plate 24 can be fixed to the humeral head or the shoulder cup of the human body, prevents the cushion body assembly 20 from rotating with respect to the humeral head or the shoulder cup of the human body, and can reinforce the structural strength of the second holder 23, so that the cushion body main body 21 can effectively support the ball head structure 10. Preferably, the second tray 23 and the wing plate 24 are integrally formed by 3D printing.

Specifically, the cushion body main body 21 is formed integrally by 3D printing alone, and different structural features including a micro-porous structure, a hole structure and a solid structure can be manufactured on any one of the cushion body main body 21, the second bracket 23 and the wing plate 24 in the process of forming the integrally formed structure by 3D printing. The first microporous structure, the first pore structure and the first solid structure are arranged on the cushion body main body 21, the first microporous structure is wrapped on the first solid structure, and the first pore structure is arranged on the first solid structure. Thus, the solid structure can ensure the strength and rigidity of the cushion body 21; the first microporous structure can be used for bone grafting, so that the shoulder joint prosthesis and the bone are firmly fixed; the first hole structure can contain bone particles to form a bone grafting cabin, so that bone formation is facilitated, and shoulder joint prosthesis can be stabilized. The second supporting piece 23 is provided with a second microporous structure, a second pore structure and a second solid structure, the second microporous structure is wrapped on the second solid structure, and the second pore structure is arranged on the second solid structure, so that the solid structure can ensure the strength and rigidity of the second supporting piece 23; the second microporous structure can be used for bone grafting, so that the shoulder joint prosthesis and the bone are firmly fixed; the second hole structure can contain bone particles to form a bone grafting cabin, so that bone formation is facilitated, and shoulder joint prosthesis can be stabilized. The third microporous structure, the third pore structure and the third solid structure are arranged on the wing plate 24, the third microporous structure wraps the third solid structure, and the third pore structure is arranged on the third solid structure, so that the solid structure can ensure the strength and the rigidity of the wing plate 24; the third microporous structure can be used for bone grafting, so that the shoulder joint prosthesis and the bone are firmly fixed; the third hole structure can contain bone particles to form a bone grafting cabin, so that bone formation is facilitated, and shoulder joint prosthesis can be stabilized.

As shown in fig. 12 to 14, the second tray 23 includes a second support column 231 and a second annular disk 232 connected to the second support column 231. The wing plate 24 is coupled to the second support column 231 and the second annular disk 232, and the second fastener 22 includes a plurality of second screws, one second screw being coupled to the second support column 231. The second annular disk 232 is provided with a sufficient bearing area, while the second support columns 231 can support the second annular disk 232 and can reinforce the structural strength of the second annular disk 232, so that the second pad 23 can effectively support the pad body 21. The second screw is attached to the inside of the second support column 231 and passes out of the second support column 231. Specifically, the plurality of second screws includes three peripheral second screws and a central second screw located at the center of the three peripheral second screws, and the central second screw and the three peripheral second screws cooperate with each other to achieve stable near-term and far-term fixation of the cushion body assembly 20.

In this embodiment, as shown in fig. 4, 12 and 18, the second supporting column 231 is provided with a taper hole 2311 matched with the second circular truncated cone 152, so that in the process that the two ends of the connecting column 15 are respectively installed in the first connecting hole 111 and the taper hole 2311, the first circular truncated cone 151 is matched with the first tapered surface, the second circular truncated cone 152 is matched with the taper hole 2311, and the second holder 23 can also be connected to the segment main body 11, so that the interchange ability of the front shoulder and the back shoulder of the shoulder joint prosthesis is improved, the installation is more flexible, and the installation efficiency is improved. Meanwhile, the second screw penetrates through the second support column 231 to enable the screw head of the second screw to be located in the taper hole 2311, and the second round table 152 blocks the taper hole 2311 to prevent the second screw from being pulled out of the taper hole 2311.

In the present embodiment, the first supporting column 131, the first annular disc 132, the second supporting column 231 and the second annular disc 232 make the first supporting member 13 and the second supporting member 23 have similar structures, so that the first supporting member 13 can be connected with the cushion body 21, and the second supporting member 23 can be connected with the segment body 11, thereby improving the interchangeability between the ball head structure 10 of the shoulder joint prosthesis and the cushion body assembly 20, making the installation more flexible, and improving the installation efficiency.

As shown in FIGS. 8 to 17, in order to facilitate the connection of the second annular disk 232 to the pad body 21, the second annular disk 232 is connected to the pad body 21 by means of a snap-fit arrangement 30. Specifically, the locking structure 30 includes a first hook 31 and a second hook 32 locked with the first hook 31. The first hook 31 is arranged at the bottom of the pad body 21, and the second hook 32 is arranged at the top of the second annular disc 232. An avoiding concave cavity is formed in the top of the second annular disc 232, the second hooks 32 are arranged on the wall of the avoiding concave cavity, the first hooks 31 and the second hooks 32 are respectively multiple, the multiple first hooks 31 are arranged along the circumferential direction of the pad body main body 21 at intervals, and the multiple second hooks 32 are arranged along the circumferential direction of the second annular disc 232 at intervals.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shoulder joint prosthesis, comprising:

a ball head structure (10) comprising a segment body (11) and a first connecting structure connected to the segment body (11), the first connecting structure comprising a first fastener (12), wherein a height H of the segment body (11) is greater than a radius R of the segment body (11);

the cushion body assembly (20) comprises a cushion body main body (21) and a second connecting structure connected to the cushion body main body (21), the cushion body main body (21) is in contact fit with the outer surface of the ball gap main body (11), and the second connecting structure comprises a second fastening piece (22).

2. Shoulder joint prosthesis according to claim 1, characterized in that the first connecting structure further comprises a first holder (13) on one side of the bottom surface of the segment body (11) and a connecting column (15) connected between the segment body (11) and the first holder (13), the first connecting structure being arranged through the first holder (13).

3. Shoulder joint prosthesis according to claim 2, characterized in that one end of the connecting column (15) is in interference fit with the segment body (11), the other end of the connecting column (15) is in interference fit with the first holder (13), and a filling block (14) is arranged at the end of the first holder (13) remote from the segment body (11).

4. Shoulder joint prosthesis according to claim 3, characterized in that the outer surface of the filling piece (14) comprises an arc-shaped face (141).

5. The shoulder joint prosthesis according to claim 4, wherein the outer surface of the filling block (14) further comprises a slope (142) connected to the arc-shaped surface (141), a longitudinal section is made on the first holder (13), the longitudinal section passes through the filling block (14), the filling block (14) has a symmetrical structure taking the longitudinal section as a symmetrical plane, the arc-shaped surface (141) and the slope (142) form an included angle a on the longitudinal section, and the included angle a is an acute angle.

6. Shoulder joint prosthesis according to claim 3, characterized in that the first support (13) comprises a first support column (131) and a first annular disc (132) connected to the first support column (131), the filling block (14) is connected to the first annular disc (132), a first connection hole (111) is provided on the segment body (11), one end of the connection column (15) is inserted into the first connection hole (111), a second connection hole (133) is provided on the first support column (131), and the other end of the connection column (15) is inserted into the second connection hole (133).

7. The shoulder joint prosthesis according to claim 6, characterized in that the second connection hole (133) comprises a first hole section (1331) and a second hole section (1332) communicating with the first hole section (1331), the diameter of the first bore section (1331) being larger than the diameter of the second bore section (1332), a transition section (1333) is formed between the first bore section (1331) and the second bore section (1332), the first fastening element (12) comprises a plurality of first screws, the head of one of the first screws is arranged in the transition section (1333) in a penetrating way, one end of the connecting column (15) is a first round table (151), the other end of the connecting column (15) is a second round table (152), the first connecting hole (111) comprises a first conical surface matched with the first round table (151), the first bore section (1331) comprises a second tapered surface cooperating with the second boss (152).

8. The shoulder joint prosthesis according to claim 2, wherein an avoiding concave cavity (112) avoiding the first holder (13) is provided on a bottom surface of the segment body (11), and a space is provided between a surface of the first holder (13) and a cavity wall of the avoiding concave cavity (112).

9. The shoulder joint prosthesis according to any one of claims 1 to 8, wherein the second connecting structure further comprises a second bracket (23) connected to the pad body main body (21) and a wing plate (24) vertically provided on the second bracket (23), the second fastener (22) being passed through the second bracket (23).

10. Shoulder prosthesis according to claim 9, characterized in that the second bracket (23) comprises a second support column (231) and a second annular disc (232) connected to the second support column (231), the wing plate (24) being connected to the second support column (231) and the second annular disc (232), the second fastening means (22) comprising a plurality of second screws, one of the second screws being connected to the second support column (231).

11. Shoulder joint prosthesis according to claim 10, characterized in that the second annular disc (232) is connected to the pad body (21) by means of a snap-in connection (30).