CN116019614A

CN116019614A - Semi-elbow joint prosthesis

Info

Publication number: CN116019614A
Application number: CN202310326993.0A
Authority: CN
Inventors: 蒋协远; 查晔军; 公茂琪; 刘敏; 霍亚平; 李健
Original assignee: Beijing Jishuitan Hospital; Beijing AK Medical Co Ltd
Current assignee: Beijing Jishuitan Hospital Affiliated To Capital Medical University; Beijing AK Medical Co Ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-04-28
Anticipated expiration: 2043-03-30
Also published as: CN116019614B

Abstract

The present invention provides a semi-elbow joint prosthesis comprising: a handle body; the connecting frame is detachably connected with the handle body; the adjusting structure is arranged between the handle body and the connecting frame and is used for adjusting the angle between the handle body and the connecting frame; the locking piece is connected between the handle body and the connecting frame; a joint part connected with the connecting frame; the handle body swings relative to the connecting frame through the adjusting structure and is locked on the connecting frame through the locking piece. The technical scheme of the application effectively solves the problem of poor universality of elbow joint prostheses in the related technology.

Description

Semi-elbow joint prosthesis

Technical Field

The invention relates to the technical field of medical instruments, in particular to a semi-elbow joint prosthesis.

Background

The elbow joint is an important joint component for coordinating the movement of the shoulder joint, the forearm and the wrist joint, and the elbow joint has good movement range and stability and can play the functions of the shoulder and the hand. However, the elbow joint is susceptible to joint diseases due to a large amount of movement, and the elbow joint prosthesis is required to be replaced due to fracture or the like caused by trauma.

In the related art, the position and angle between the humeral stem and the anatomical neck are fixed, but the elbow prosthesis cannot meet the needs of all patients due to the difference in bone position and size of the patients, i.e., there are cases where implantation is impossible, and the versatility is poor.

Disclosure of Invention

The invention mainly aims to provide a semi-elbow joint prosthesis to solve the problem of poor universality of elbow joint prostheses in the related technology.

To achieve the above object, the present invention provides a semi-elbow joint prosthesis comprising: a handle body; the connecting frame is detachably connected with the handle body; the adjusting structure is arranged between the handle body and the connecting frame and is used for adjusting the angle between the handle body and the connecting frame; the locking piece is connected between the handle body and the connecting frame; a joint part connected with the connecting frame; the handle body swings relative to the connecting frame through the adjusting structure and is locked on the connecting frame through the locking piece.

Further, the adjusting structure comprises a protruding portion and a containing concave portion, one of the protruding portion and the containing concave portion is arranged on one side, facing the connecting frame, of the handle body, the other of the protruding portion and the containing concave portion is arranged on one side, facing the handle body, of the connecting frame, the outer surface of the protruding portion is of a first arc-shaped structure, the inner surface of the containing concave portion is of a second arc-shaped structure, the height of the protruding portion is larger than the depth of the containing concave portion, and the protruding portion is inserted into the containing concave portion.

Further, the protruding portion is a hemispherical structure, the receiving recess is a hemispherical recess, and the diameter of the hemispherical structure is equal to the diameter of the hemispherical recess.

Further, the handle body comprises a first rod body and a connecting block, the connecting block is arranged at the end part of the first rod body, the connecting frame comprises a first connecting plate and a second connecting plate, the first connecting plate is connected to the side part of the second connecting plate, the second connecting plate and the connecting block are arranged in a stacked mode, and the adjusting structure is arranged between the second connecting plate and the connecting block.

Further, be provided with a plurality of first connecting holes on the connecting block, a plurality of first connecting holes enclose and establish in adjusting structure's periphery, are provided with a plurality of second connecting holes on the second connecting plate, and a plurality of second connecting holes enclose and establish in adjusting structure's periphery, and a plurality of first connecting holes and a plurality of second connecting holes correspond the setting, and the locking piece includes a plurality of bolts, and a plurality of bolts insert in corresponding first connecting hole and the second connecting hole one-to-one.

Further, the interior of the bolt is hollow.

Further, the semi-elbow joint prosthesis further comprises a sliding rail assembly, wherein the sliding rail assembly is arranged between the connecting block and the second connecting plate.

Further, the slide rail assembly includes a slide rail and a slide rail, one of the slide rail and the slide rail being disposed at a side portion of the connection block, and the other of the slide rail and the slide rail being disposed at a side portion of the second connection block.

Further, the slide rail sets up on the second connecting plate, and the spout setting is on the connecting block, and the slide rail includes riser and slider, and the riser sets up the lateral part at the second connecting plate, and the slider setting is at the top of riser and towards adjusting structure extension, and the slider slidable ground sets up in the spout, has the clearance between the cell wall of spout and the slider.

Further, a limiting structure is arranged between the sliding rail and the sliding groove and comprises a limiting protrusion and a limiting concave portion, one of the limiting protrusion and the limiting concave portion is arranged on the sliding rail, and the other one of the limiting protrusion and the limiting concave portion is arranged in the sliding groove.

Further, the connecting frame further comprises a third connecting plate, the third connecting plate and the first connecting plate are oppositely arranged and are respectively positioned on two sides of the second connecting plate, and the first connecting plate and the third connecting plate are connected with the joint part.

Further, the joint portion is a cylindrical structure, the cylindrical structure comprises a first column section, a second column section and a ball head section, the second column section is connected between the ball head section and the first column section, the diameter of the first column section is gradually reduced in the direction from the first column section to the second column section, and the diameter of the second column section is firstly increased and then reduced in the direction from the first column section to the second column section.

Further, a communication hole is provided in the columnar structure, and an axis of the communication hole extends in a length direction of the columnar structure.

By applying the technical scheme of the invention, the handle body is detachably connected with the connecting frame, the adjusting structure is arranged between the handle body and the connecting frame, and the angle between the handle body and the connecting frame can be adjusted by the adjusting structure. The locking piece is connected between the handle body and the connecting frame, and the joint part is connected with the connecting frame. The handle body swings relative to the connecting frame through the adjusting structure and is locked on the connecting frame through the locking piece. Through the arrangement, before implantation, the angle between the handle body and the connecting frame is adjusted through the adjusting structure, and then the handle body is locked through the locking piece. This allows the elbow prosthesis to fit bones of different sizes. The adjusting mode is simple and convenient to set. Therefore, the technical scheme of the application effectively solves the problem of poor universality of elbow joint prostheses in the related technology.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 shows a schematic exploded view of an embodiment of a semi-elbow joint prosthesis according to the present invention;

FIG. 2 shows a schematic perspective view of the semi-elbow joint prosthesis of FIG. 1;

FIG. 3 shows a schematic cross-sectional view of the semi-elbow joint prosthesis of FIG. 2;

FIG. 4 shows a partial enlarged view of the semi-elbow joint prosthesis of FIG. 3 at A;

FIG. 5 shows a schematic perspective view of the stem of the semi-elbow joint prosthesis of FIG. 1;

FIG. 6 shows a schematic perspective view of another view of the handle of FIG. 5;

fig. 7 shows a schematic perspective view of the connecting frame and the joint of the semi-elbow joint prosthesis of fig. 1.

Wherein the above figures include the following reference numerals:

10. a handle body; 11. a first rod body; 12. a connecting block; 121. a first connection hole; 20. a connecting frame; 21. a first connection plate; 22. a second connecting plate; 221. a second connection hole; 23. a third connecting plate; 30. an adjustment structure; 31. a boss; 32. a receiving recess; 40. a locking member; 41. a bolt; 50. a joint part; 51. a first column section; 52. a second column section; 53. a ball head section; 54. a communication hole; 60. a slide rail assembly; 61. a slide rail; 611. a vertical plate; 612. a slide block; 62. a chute; 70. a limit structure; 71. a limit protrusion; 72. limit concave part.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

As shown in fig. 1 to 3, in the present embodiment, the semi-elbow joint prosthesis includes: the handle body 10, the connecting frame 20, the adjusting structure 30, the locking member 40, and the joint 50. The connection frame 20 is detachably connected with the handle body 10. The adjusting structure 30 is disposed between the handle body 10 and the connection frame 20 to adjust an angle between the handle body 10 and the connection frame 20. The locking member 40 is connected between the shank 10 and the connecting frame 20. The joint 50 is connected to the link 20. The handle body 10 swings relative to the connecting frame 20 through the adjusting structure 30 and is locked on the connecting frame 20 through the locking piece 40.

By applying the technical scheme of the embodiment, the handle body 10 is detachably connected with the connecting frame 20, the adjusting structure 30 is arranged between the handle body 10 and the connecting frame 20, and the angle between the handle body 10 and the connecting frame 20 can be adjusted by the adjusting structure 30. The locking member 40 is connected between the shank 10 and the link 20, and the joint 50 is connected to the link 20. The handle body 10 swings relative to the connection frame 20 through the adjustment structure 30 and is locked to the connection frame 20 through the locking member 40. With the above arrangement, the angle between the handle body 10 and the connection frame 20 is adjusted by the adjusting structure 30 before implantation, and then locked by the locking member 40. This allows the elbow prosthesis to fit bones of different sizes. The adjusting mode is simple and convenient to set. Therefore, the technical scheme of the embodiment effectively solves the problem of poor universality of elbow joint prostheses in the related technology.

The joint 50 is a humeral block. The handle body 10 is made of cobalt-chromium-molybdenum alloy, and can be titanium alloy.

As shown in fig. 1 to 3, in the present embodiment, the portion of the stem body 10 inserted into the humeral cavity may have a mesh structure to facilitate osseointegration; the cement fixing device can also be used for cement fixing, the section of the handle body 10 is trapezoid, the anti-rotation function is achieved, and a groove is formed in the handle body 10, so that the anti-rotation function is improved; the handle body 10 further comprises a second rod body, the length of the second rod body is smaller than that of the first rod body, and the second rod body is provided with a grid structure, so that osseointegration with the implanted bone is allowed, and long-term stability is improved; and the presence of the recess may allow for height adjustment of the filler bone, allowing for better attachment between the second shaft, the filler bone and the humeral cortex.

In the present embodiment, the end of the joint portion 50 is provided with a ball and socket, which enables weight reduction. The outer surface of the knuckle 50 is highly polished.

As shown in fig. 4 to 7, in the present embodiment, the adjustment structure 30 includes a boss 31 and a receiving recess 32, one of the boss 31 and the receiving recess 32 is provided on a side of the handle body 10 facing the connection frame 20, the other of the boss 31 and the receiving recess 32 is provided on a side of the connection frame 20 facing the handle body 10, an outer surface of the boss 31 is a first arc-shaped structure, an inner surface of the receiving recess 32 is a second arc-shaped structure, a height of the boss 31 is greater than a depth of the receiving recess 32, and the boss 31 is inserted into the receiving recess 32. Because the outer surface of the protruding portion 31 is of a first arc structure, the accommodating recess 32 is of a second arc structure, and the second arc structure is fastened to the first arc structure, so that rotation can be achieved, that is, the handle body 10 and the connecting frame 20 can swing.

The above-mentioned swing is a circumferential swing, and the axis of the shank 10 can be formed into a taper shape when swinging.

As shown in fig. 4 to 7, in the present embodiment, the boss 31 is a hemispherical structure, the accommodation recess 32 is a hemispherical recess, and the diameter of the hemispherical structure is equal to the diameter of the hemispherical recess. The hemispherical structure and the hemispherical concave structure are simpler and can realize swinging.

As shown in fig. 5 and 6, in the present embodiment, the handle body 10 includes a first rod body 11 and a connection block 12, the connection block 12 is provided at an end of the first rod body 11, the connection frame 20 includes a first connection plate 21 and a second connection plate 22, the first connection plate 21 is connected to a side portion of the second connection plate 22, the second connection plate 22 and the connection block 12 are stacked, and the adjustment structure 30 is provided between the second connection plate 22 and the connection block 12. The arrangement of the second connecting plate 22 and the connecting block 12 can realize an installation space for the arrangement of the adjusting structure 30, and can make the position of the adjusting structure 30 relatively stable.

Specifically, the adjustment structure 30 is located at the center of the connection block 12.

As shown in fig. 5 and 6, in the present embodiment, the connection block 12 is provided with a plurality of first connection holes 121, the plurality of first connection holes 121 are surrounded on the outer periphery of the adjustment structure 30, the second connection plate 22 is provided with a plurality of second connection holes 221, the plurality of second connection holes 221 are surrounded on the outer periphery of the adjustment structure 30, the plurality of first connection holes 121 and the plurality of second connection holes 221 are correspondingly arranged, the locking member 40 includes a plurality of bolts 41, and the plurality of bolts 41 are inserted into the corresponding first connection holes 121 and second connection holes 221 in a one-to-one correspondence. The above-described arrangement of the plurality of first connecting holes 121 and the plurality of second connecting holes 221 enables the second connecting plate 22 and the connecting block 12 to be fixed.

Specifically, after the angle adjustment is performed by the adjustment structure 30, the plurality of bolts 41 are sequentially connected in the corresponding first and second connection holes 121 and 221, so that the fixation is performed.

It should be noted that, after the angle adjustment, there is a dislocation between the corresponding first connection hole 121 and the second connection hole 221, so that the first connection hole 121 and the second connection hole 221 that are not dislocated need to be penetrated into the corresponding first connection hole 121 and the second connection hole 221 through the bolt 41, that is, the thick connection is firstly implemented, and then the remaining corresponding first connection hole 121 and the second connection hole 221 are connected through the bolt 41.

There is a certain overlapping portion of the first connecting hole 121 and the second connecting hole 221 that are offset.

As shown in fig. 1 to 3, in the present embodiment, fine adjustment is achieved between the joint 50 and the shank 10 by the adjustment structure 30: when the left-right direction needs to be adjusted, the matching degree of the left-right 2 bolts 41 is adjusted, when the up-down direction needs to be adjusted, the matching degree of the up-down 2 bolts 41 is adjusted, the protruding part 31 can rotate in the accommodating concave part 32, and the up-down, left-right adjustment position is allowed, so that the purpose of fine adjustment of the joint part 50 is achieved.

As shown in fig. 4, in the present embodiment, the inside of the bolt 41 is a hollow structure. The hollow structure can realize bone ingrowth, and thus the position of the bolt 41 can be made more stable.

As shown in fig. 5-7, in this embodiment, the semi-elbow joint prosthesis further includes a slide rail assembly 60, the slide rail assembly 60 being disposed between the connection block 12 and the second connection plate 22. The slide rail assembly 60 can enable the connection block 12 and the second connection plate 22 to be slidingly connected, so that the positions of the connection block 12 and the second connection plate 22 can be more stable.

It should be noted that, a certain movable space is provided between the connecting block 12 and the second connecting plate 22.

As shown in fig. 5 to 7, in the present embodiment, the slide rail assembly 60 includes the slide rail 61 and the slide rail 62, one of the slide rail 62 and the slide rail 61 is provided at the side of the connection block 12, and the other of the slide rail 62 and the slide rail 61 is provided at the side of the second connection plate 22. The sliding groove 62 and the sliding rail 61 are simple in structure and convenient to set.

As shown in fig. 5 to 7, in the present embodiment, the slide rail 61 is disposed on the second connection plate 22, the slide groove 62 is disposed on the connection block 12, the slide rail 61 includes a vertical plate 611 and a slider 612, the vertical plate 611 is disposed at a side portion of the second connection plate 22, the slider 612 is disposed at a top portion of the vertical plate 611 and extends toward the adjustment structure 30, the slider 612 is slidably disposed in the slide groove 62, and a gap is provided between a groove wall of the slide groove 62 and the slider 612. The above arrangement ensures that the second connection plate 22 is connected to the connection block 12 and provides space for the swing of the second connection plate 22 and the connection block 12 due to the clearance between the slide grooves 62 and the groove walls and the slide blocks 612.

As shown in fig. 5 to 7, in the present embodiment, a stopper structure 70 is provided between the slide rail 61 and the slide groove 62, the stopper structure 70 includes a stopper protrusion 71 and a stopper recess 72, one of the stopper protrusion 71 and the stopper recess 72 is provided on the slide rail 61, and the other of the stopper protrusion 71 and the stopper recess 72 is provided in the slide groove 62. The position of the connecting block 12 and the second connecting plate 22 can be more stable due to the limiting structure 70, that is, the sliding rail 61 cannot be separated from the sliding groove 62.

As shown in fig. 5 to 7, in the present embodiment, the connecting frame 20 further includes a third connecting plate 23, the third connecting plate 23 and the first connecting plate 21 are disposed opposite to each other and are located on both sides of the second connecting plate 22, and the first connecting plate 21 and the third connecting plate 23 are connected to the joint portion 50. The above-described arrangement of the third connecting plate 23 can make the connection of the link frame 20 and the joint portion 50 more stable.

As shown in fig. 1 and 2 and fig. 7, in the present embodiment, the joint 50 is a cylindrical structure, the cylindrical structure includes a first cylindrical section 51, a second cylindrical section 52 and a ball section 53, the second cylindrical section 52 is connected between the ball section 53 and the first cylindrical section 51, the diameter of the first cylindrical section 51 gradually decreases in the direction from the first cylindrical section 51 to the second cylindrical section 52, and the diameter of the second cylindrical section 52 increases and then decreases in the direction from the first cylindrical section 51 to the second cylindrical section 52. The arrangement described above enables the articular portion 50 to fully mimic the function of a humeral block.

As shown in fig. 1 and 3, in the present embodiment, a communication hole 54 is provided in the columnar structure, and the axis of the communication hole 54 extends in the longitudinal direction of the columnar structure. The communication hole 54 described above enables the ligament to be connected.

In this embodiment, the joint portion 50 is provided with a socket hole, the first connecting plate 21 can be inserted into the socket hole, a tooth slot and a rack are provided between the first connecting plate 21 and the socket hole, and the rack can be engaged with the tooth slot, so that the first connecting plate 21 can be effectively fixed. Specifically, a portion of the rack may be engaged with a portion of the tooth slot during adjustment. Before implantation, the human skeleton is measured, the handle body 10 is connected to the connecting frame 20, the first connecting plate 21 is inserted into the inserting hole, and the depth of the first connecting plate 21 inserted into the inserting hole is adjusted through the tooth grooves and the racks, so that the angles of the connecting frame 20 and the joint part 50 are matched with a human body. I.e. the hemi-elbow joint prosthesis is able to meet the bone size and position of different patients.

An accommodating space is arranged in the first connecting plate 21, a plurality of through holes are formed in the first side wall of the first connecting plate 21 at intervals, a rack is arranged in the accommodating space, and the rack is retractably arranged in the through holes and has a locking position extending outwards and a avoiding position retracting inwards. The setting of accommodation space can hold the rack effectively, can make the position more reasonable like this, and tooth portion on the rack can stretch out through the through-hole.

The semi-elbow joint prosthesis further comprises a connecting rod and a gear, wherein the connecting rod is connected with the end of the rack, a plurality of convex teeth are arranged on the connecting rod at intervals, the gear and the connecting rod are arranged in the accommodating space, the gear is meshed with the convex teeth, and the rack is driven by the connecting rod to switch between a locking position and an avoiding position. The gear can drive the connecting rod to move, and then the rack is driven to move at the locking position and the avoiding position.

Specifically, in the present embodiment, the accommodation space is in a "7" shape, and the connecting rod and the rack can move in the accommodation space.

The hemi-elbow joint prosthesis further comprises a locking element connected between the gear wheel and the first connection plate 21. The position of the gear can be effectively locked through the locking piece after the gear is rotated and the position of the rack is adjusted.

The gear is provided with an adjusting groove and a mounting hole, the mounting hole is formed in the bottom wall of the adjusting groove, the locking piece is located in the mounting hole, and a distance is reserved between the locking piece and the notch of the adjusting groove. The setting of adjustment tank can realize adjusting gear's rotation, and specifically, the adjustment tank is "I" style of calligraphy, can drive gear rotation through the style of calligraphy screwdriver, and then drives the rack and remove.

The side wall of the first connecting plate 21 is provided with an avoidance hole, the avoidance hole is communicated with the accommodating space, and the gear is arranged in the avoidance hole. The gear can be exposed through the arrangement of the avoidance holes, so that medical staff can conveniently operate the gear to rotate.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative 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 in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hemi-elbow joint prosthesis comprising:

a handle body (10);

a connecting frame (20) detachably connected with the handle body (10);

an adjusting structure (30) arranged between the handle body (10) and the connecting frame (20) for adjusting the angle between the handle body (10) and the connecting frame (20);

a locking member (40) connected between the shank (10) and the connecting frame (20);

a joint part (50) connected to the connection frame (20);

wherein the handle body (10) swings relative to the connecting frame (20) through the adjusting structure (30) and is locked on the connecting frame (20) through the locking piece (40).

2. The hemi-elbow joint prosthesis according to claim 1, wherein the adjustment structure (30) comprises a protrusion (31) and a receiving recess (32), one of the protrusion (31) and the receiving recess (32) is disposed at a side of the stem (10) facing the connection frame (20), the other of the protrusion (31) and the receiving recess (32) is disposed at a side of the connection frame (20) facing the stem (10), an outer surface of the protrusion (31) is a first arc-shaped structure, an inner surface of the receiving recess (32) is a second arc-shaped structure, a height of the protrusion (31) is greater than a depth of the receiving recess (32), and the protrusion (31) is inserted into the receiving recess (32).

3. A hemi-elbow joint prosthesis according to claim 2 wherein the boss (31) is of hemispherical configuration and the receiving recess (32) is of hemispherical recess, the diameter of the hemispherical configuration being equal to the diameter of the hemispherical recess.

4. The hemi-elbow joint prosthesis according to claim 1 wherein the stem (10) comprises a first stem body (11) and a connection block (12), the connection block (12) is disposed at an end of the first stem body (11), the connection frame (20) comprises a first connection plate (21) and a second connection plate (22), the first connection plate (21) is connected to a side of the second connection plate (22), the second connection plate (22) and the connection block (12) are disposed in a stacked arrangement, and the adjustment structure (30) is disposed between the second connection plate (22) and the connection block (12).

5. The hemi-elbow joint prosthesis according to claim 4, wherein the connection block (12) is provided with a plurality of first connection holes (121), the plurality of first connection holes (121) are surrounded on the outer circumference of the adjustment structure (30), the second connection plate (22) is provided with a plurality of second connection holes (221), the plurality of second connection holes (221) are surrounded on the outer circumference of the adjustment structure (30), the plurality of first connection holes (121) and the plurality of second connection holes (221) are correspondingly arranged, the locking member (40) comprises a plurality of bolts (41), and the plurality of bolts (41) are correspondingly inserted into the corresponding first connection holes (121) and second connection holes (221).

6. A semi-elbow joint prosthesis according to claim 5, wherein the interior of the bolt (41) is hollow.

7. The hemi-elbow joint prosthesis of claim 4 further comprising a slide rail assembly (60), the slide rail assembly (60) disposed between the connection block (12) and the second connection plate (22).

8. The hemi-elbow joint prosthesis of claim 7 wherein the slide rail assembly (60) comprises a slide rail (61) and a slide rail (62), one of the slide rail (62) and the slide rail (61) being disposed on a side of the connection block (12) and the other of the slide rail (62) and the slide rail (61) being disposed on a side of the second connection block (22).

9. The hemi-elbow joint prosthesis according to claim 8 wherein the slide rail (61) is disposed on the second connection plate (22), the slide slot (62) is disposed on the connection block (12), the slide rail (61) comprises a riser (611) and a slider (612), the riser (611) is disposed on a side of the second connection plate (22), the slider (612) is disposed on top of the riser (611) and extends toward the adjustment structure (30), the slider (612) is slidably disposed within the slide slot (62), and a gap is provided between a slot wall of the slide slot (62) and the slider (612).

10. The hemi-elbow joint prosthesis according to claim 8, wherein a spacing structure (70) is provided between the sliding rail (61) and the sliding chute (62), the spacing structure (70) comprising a spacing protrusion (71) and a spacing recess (72), one of the spacing protrusion (71) and the spacing recess (72) being disposed on the sliding rail (61), the other of the spacing protrusion (71) and the spacing recess (72) being disposed within the sliding chute (62).

11. The hemi-elbow joint prosthesis according to claim 4 wherein the connecting frame (20) further comprises a third connecting plate (23), the third connecting plate (23) and the first connecting plate (21) being disposed opposite each other and on either side of the second connecting plate (22), the first connecting plate (21) and the third connecting plate (23) being connected to the joint portion (50).

12. The hemi-elbow joint prosthesis according to claim 1 wherein the joint (50) is a cylindrical structure comprising a first cylindrical section (51), a second cylindrical section (52) and a bulb section (53), the second cylindrical section (52) being connected between the bulb section (53) and the first cylindrical section (51), the diameter of the first cylindrical section (51) gradually decreasing in the direction from the first cylindrical section (51) to the second cylindrical section (52); in the direction from the first column section (51) to the second column section (52), the diameter of the second column section (52) increases and then decreases.

13. A hemi-elbow joint prosthesis according to claim 12 wherein a communication hole (54) is provided in the cylindrical structure, the axis of the communication hole (54) extending along the length of the cylindrical structure.