CN116019612A

CN116019612A - Semi-elbow joint prosthesis

Info

Publication number: CN116019612A
Application number: CN202310326925.4A
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: CN116019612B

Abstract

The present invention provides a semi-elbow joint prosthesis comprising: a connecting handle; the connecting frame is connected with the connecting handle and comprises a base body, a first connecting arm and a second connecting arm, wherein the first connecting arm and the second connecting arm are connected with the base body and are arranged at intervals; the pulley part is provided with a connecting hole, the first connecting arm is connected with the side part of the pulley part, and the second connecting arm is inserted into the connecting hole; and the adjusting structure is arranged between the connecting hole and the second connecting arm to adjust the depth of the second connecting arm inserted into the connecting hole. The technical scheme of the application effectively solves the problem that the elbow joint prosthesis in the related art cannot be implanted due to the fact that the position and the angle between the humerus handle and the anatomical neck are fixed.

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

In the related art, the elbow joint is an important joint component responsible for coordinating the movements of the shoulder joint, forearm and wrist joint, and in order to be able to perform the functions of the shoulder and hand, it is necessary to provide the elbow joint with a good range of motion and stability. The elbow joint is susceptible to joint diseases due to large activity, and the elbow joint prosthesis needs to be replaced in trauma cases such as fracture.

In the related art, there are cases where implantation is impossible due to the difference in bone position and size of the patient, but the position and angle between the humeral stem and the anatomical neck of the elbow joint prosthesis are fixed.

Disclosure of Invention

The invention mainly aims to provide a semi-elbow joint prosthesis, which aims to solve the problem that the elbow joint prosthesis in the related art cannot be implanted due to fixed position and angle between a humerus handle and a anatomic neck.

To achieve the above object, the present invention provides a semi-elbow joint prosthesis comprising: a connecting handle; the connecting frame is connected with the connecting handle and comprises a base body, a first connecting arm and a second connecting arm, wherein the first connecting arm and the second connecting arm are connected with the base body and are arranged at intervals; the pulley part is provided with a connecting hole, the first connecting arm is connected with the side part of the pulley part, and the second connecting arm is inserted into the connecting hole; and the adjusting structure is arranged between the connecting hole and the second connecting arm to adjust the depth of the second connecting arm inserted into the connecting hole.

Further, the adjusting structure comprises tooth grooves and racks, one of the tooth grooves and the racks is arranged on the second connecting arm, the other one of the tooth grooves and the racks is arranged in the connecting hole, and the racks are meshed with the tooth grooves.

Further, the second connecting arm comprises a first side wall and a second side wall, a connecting line of the first side wall and the second side wall is perpendicular to the direction from the first connecting arm to the second connecting arm, the rack is arranged on the first side wall and/or the second side wall, and the tooth slot is arranged in the connecting hole.

Further, an accommodating space is arranged in the second connecting arm, a plurality of through holes are formed in the first side wall at intervals, a rack is arranged in the accommodating space, and the rack is retractably arranged in the through holes and is provided with a locking position extending outwards and a avoiding position retracting inwards.

Further, the adjusting structure further comprises a connecting rod and a gear, 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 to switch between a locking position and an avoiding position through the connecting rod.

Further, the adjustment structure further comprises a locking member connected between the gear and the second connecting arm.

Further, an adjusting groove and a mounting hole are formed in the gear, 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.

Further, dodge the hole is provided with on the lateral wall of second linking arm, dodges hole and accommodation space intercommunication, and the gear setting is dodged downthehole.

Further, the number of the racks is two, and the two racks are respectively arranged on the first side wall and the second side wall.

Further, one side of the first connecting arm far away from the connecting handle is provided with a stop block, the stop block extends towards the second connecting arm, a limiting block is arranged on the stop block, the limiting block is vertically arranged, the limiting block is connected with the second connecting arm and the stop block, an inner concave part is formed in the end part of the pulley part, a limiting groove is formed in the inner concave part, the stop block is inserted into the inner concave part, and the limiting block is inserted into the limiting groove.

Further, the connecting handle comprises a first rod body, a second rod body and a connecting block, wherein the first rod body and the second rod body are arranged at intervals and are arranged on the same surface of the connecting block, and the length of the first rod body is greater than that of the second rod body.

Further, a plurality of bone grafting cabins are arranged on one side, facing the first rod body, of the second rod body at intervals.

Further, a plug-in column is arranged on the base body, a plug-in hole is arranged on the connecting block, the plug-in column is inserted into the plug-in hole, and a locking piece is arranged between the plug-in column and the base body.

By applying the technical scheme of the invention, the connecting frame is connected with the connecting handle and comprises a base body, and a first connecting arm and a second connecting arm which are connected with the base body and are arranged at intervals. The pulley part is provided with a connecting hole, the first connecting arm is connected with the side part of the pulley part, and the second connecting arm is inserted into the connecting hole. The adjusting structure is arranged between the connecting hole and the second connecting arm, and the adjusting structure can adjust the depth of the second connecting arm inserted into the connecting hole. Through foretell setting, before implanting, measure human skeleton, connect the handle on the link again, insert the connecting hole with the second linking arm in, the rethread adjusts the degree of depth that the second linking arm inserted to the connecting hole, makes the angle and the human adaptation of link and coaster portion like this. Namely, the semi-elbow joint prosthesis can meet the bone sizes and positions of different patients, so that the technical scheme of the application effectively solves the problem that the elbow joint prosthesis cannot be implanted due to the fact that the positions and angles between a humerus handle and a anatomical neck of the elbow joint prosthesis in the related art are fixed.

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 an exploded schematic 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 perspective view of the connecting frame of the semi-elbow joint prosthesis of FIG. 2;

FIG. 4 shows a partial enlarged view at A of the connector frame of FIG. 3;

FIG. 5 shows a schematic cross-sectional view of the connector of FIG. 3;

FIG. 6 shows a schematic perspective view of the adjustment structure of the semi-elbow joint prosthesis of FIG. 1;

FIG. 7 shows a schematic perspective view of the sled portion of the semi-elbow joint prosthesis of FIG. 1;

FIG. 8 is a schematic perspective view of another view of the sled portion of FIG. 7;

fig. 9 shows a schematic perspective view of the stem of the semi-elbow prosthesis of fig. 1.

Wherein the above figures include the following reference numerals:

10. a connecting handle; 11. a first rod body; 12. a second rod body; 121. a bone grafting bin; 13. a connecting block; 131. a plug hole; 20. a connecting frame; 21. a base; 211. a plug-in column; 22. a first connecting arm; 221. a stop block; 222. a limiting block; 23. a second connecting arm; 231. a first sidewall; 2311. a through hole; 232. a second sidewall; 233. an accommodation space; 234. avoidance holes; 30. a pulley section; 31. a connection hole; 32. an inner concave portion; 321. a limit groove; 40. an adjustment structure; 41. tooth slots; 42. a rack; 43. a connecting rod; 431. convex teeth; 44. a gear; 441. an adjustment tank; 442. a mounting hole; 50. a locking member;

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 and fig. 7 to 9, in the present embodiment, the semi-elbow joint prosthesis includes: a connection handle 10, a connection frame 20, a pulley part 30 and an adjusting structure 40. The connecting frame 20 is connected with the connecting handle 10, and the connecting frame 20 comprises a base 21, and a first connecting arm 22 and a second connecting arm 23 which are connected with the base 21 and are arranged at intervals. The pulley portion 30 is provided with a coupling hole 31, the first coupling arm 22 is coupled to a side portion of the pulley portion 30, and the second coupling arm 23 is inserted into the coupling hole 31. An adjustment structure 40 is provided between the connection hole 31 and the second connection arm 23 to adjust the depth of insertion of the second connection arm 23 into the connection hole 31.

By applying the technical scheme of the embodiment, the connecting frame 20 is connected with the connecting handle 10, and the connecting frame 20 comprises a base 21, and a first connecting arm 22 and a second connecting arm 23 which are connected with the base 21 and are arranged at intervals. The pulley portion 30 is provided with a coupling hole 31, the first coupling arm 22 is coupled to a side portion of the pulley portion 30, and the second coupling arm 23 is inserted into the coupling hole 31. An adjusting structure 40 is provided between the connection hole 31 and the second connection arm 23, and the adjusting structure 40 can adjust the depth of the second connection arm 23 inserted into the connection hole 31. Through the above arrangement, before implantation, the human bone is measured, the connection handle 10 is connected to the connection frame 20, the second connection arm 23 is inserted into the connection hole 31, and the depth of the second connection arm 23 inserted into the connection hole 31 is adjusted by the adjusting structure 40, so that the angles of the connection frame 20 and the pulley portion 30 are adapted to the human body. Namely, the semi-elbow joint prosthesis can meet the bone sizes and positions of different patients, so the technical scheme of the embodiment effectively solves the problem that the elbow joint prosthesis in the related art cannot be implanted due to the fact that the positions and angles between a humerus handle and an anatomical neck are fixed.

The material of the connecting handle 10 is cobalt-chromium-molybdenum alloy, and can be titanium alloy.

As shown in fig. 1 to 7, in the present embodiment, the adjustment structure 40 includes a tooth groove 41 and a rack 42, one of the tooth groove 41 and the rack 42 is provided on the second connection arm 23, the other of the tooth groove 41 and the rack 42 is provided in the connection hole 31, and the rack 42 and the tooth groove 41 are engaged. The rack 42 can be engaged with the tooth groove 41, so that the second connecting arm 23 can be effectively fixed. Specifically, a portion of the rack 42 and a portion of the slot 41 may be engaged during adjustment.

As shown in fig. 5 and 6, in the present embodiment, the second connecting arm 23 includes a first side wall 231 and a second side wall 232, the line connecting the first side wall 231 and the second side wall 232 is perpendicular to the direction from the first connecting arm 22 to the second connecting arm 23, the rack 42 is disposed on the first side wall 231 and/or the second side wall 232, and the spline 41 is disposed in the connecting hole 31. The above arrangement can effectively achieve fixation. Specifically, in the present embodiment, the racks 42 are provided on the first side wall 231 and the second side wall 232.

In an embodiment not shown in the figures, the rack is provided on the first side wall or the rack is provided on the second side wall.

As shown in fig. 5 and 6, in the present embodiment, the second connecting arm 23 is provided therein with an accommodating space 233, the first side wall 231 is provided with a plurality of through holes 2311 at intervals, the rack 42 is provided in the accommodating space 233, and the rack 42 is retractably provided in the through holes 2311 and has a locking position protruding outward and a retracted avoidance position retracted inward. The arrangement of the accommodating space 233 can effectively accommodate the rack 42, so that the position can be made more reasonable, and the tooth portion on the rack 42 can be protruded through the through hole 2311.

As shown in fig. 5 and 6, in the present embodiment, the adjusting structure 40 further includes a connecting rod 43 and a gear 44, the connecting rod 43 is connected with an end portion of the rack 42, a plurality of protruding teeth 431 are provided on the connecting rod 43 at intervals, the gear 44 and the connecting rod 43 are both provided in the accommodating space 233, the gear 44 is meshed with the protruding teeth 431, and the rack 42 is driven to switch between the locking position and the avoidance position by the connecting rod 43. The gear 44 can drive the connecting rod 43 to move, and further drive the rack 42 to move between the locking position and the avoiding position.

Specifically, in the present embodiment, the accommodation space 233 is in a "7" shape, and the connection rod 43 and the rack 42 can move within the accommodation space 233.

As shown in fig. 5 and 6, in the present embodiment, the adjustment structure 40 further includes a locking member 50, and the locking member 50 is connected between the gear 44 and the second connecting arm 23. The locking member 50 is provided to effectively lock the position of the gear 44, i.e., the position of the gear 44 is locked by the locking member 50 when the gear 44 is rotated to adjust the position of the rack 42.

As shown in fig. 5 and 6, in the present embodiment, the gear 44 is provided with an adjustment groove 441 and a mounting hole 442, the mounting hole 442 is located on the bottom wall of the adjustment groove 441, the locking member 50 is located in the mounting hole 442, and a distance is provided between the locking member 50 and the notch of the adjustment groove 441. The adjusting groove 441 is configured to rotate the adjusting gear 44, specifically, the adjusting groove 441 is in a shape of a straight line, and the adjusting groove can drive the gear 44 to rotate by a straight line screwdriver, so as to drive the rack 42 to move.

As shown in fig. 5 and 6, in the present embodiment, the side wall of the second connecting arm 23 is provided with a relief hole 234, the relief hole 234 communicates with the accommodating space 233, and the gear 44 is disposed in the relief hole 234. The relief aperture 234 is provided to expose the gear 44, which facilitates rotation of the gear 44 by a medical practitioner.

As shown in fig. 5 and 6, in the present embodiment, there are two racks 42, and two racks 42 are provided on the first side wall 231 and the second side wall 232, respectively. The above arrangement can ensure the effect of locking.

As shown in fig. 3 and 8, in the present embodiment, a stopper 221 is disposed on a side of the first connecting arm 22 away from the connecting handle 10, the stopper 221 extends toward the second connecting arm 23, a stopper 222 is disposed on the stopper 221, the stopper 222 is disposed vertically, the stopper 222 is connected with the second connecting arm 23 and the stopper 221, an inner concave portion 32 is disposed at an end portion of the pulley portion 30, a limiting groove 321 is disposed in the inner concave portion 32, the stopper 221 is inserted into the inner concave portion 32, and the stopper 222 is inserted into the limiting groove 321. The above arrangement can make the connection stability of the first connecting arm 22 and the pulley portion 30 better, the extending direction of the center surface of the stopper 222 is the same as the extending direction of the connecting handle 10, and thus the stopper 222 can move in the stopper groove 321.

As shown in fig. 9, in the present embodiment, the connection handle 10 includes a first rod 11, a second rod 12 and a connection block 13, where the first rod 11 and the second rod 12 are disposed at intervals and are disposed on the same surface of the connection block 13, and the length of the first rod 11 is greater than that of the second rod 12. The first rod 11 is inserted into the humeral cavity, the second rod 12 is positioned outside the humerus, and the first rod 11, the second rod 12 and the humerus are connected by the fastener, so that the stability of the connection can be ensured.

As shown in fig. 9, in the present embodiment, the portion of the first rod 11 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 first rod body 11 is trapezoid, the anti-rotation function is achieved, and a groove is formed in one side, far away from the second rod body 12, of the first rod body 11, so that the anti-rotation function is increased; the second rod body 12 is provided with a grid structure which allows osseointegration with the implanted bone and increases long-term stability; and the presence of the bone grafting cartridge 121 may allow for height adjustment of the filler bone for better attachment between the second shaft, the filler bone, and the humeral cortex.

As shown in fig. 9, in the present embodiment, a plurality of bone grafting bins 121 are disposed at intervals on a side of the second rod body 12 facing the first rod body 11. The bone grafting bin 121 is internally filled with autogenous bone or allogenic bone, so that the autogenous bone or the allogenic bone can be combined with the humerus bone in a growing mode, and the connecting effect can be improved.

As shown in fig. 1 to 3 and 9, in the present embodiment, a plug post 211 is provided on the base 21, a plug hole 131 is provided on the connection block 13, the plug post 211 is inserted into the plug hole 131, and a locking member 50 is provided between the plug post 211 and the base 21. The above-mentioned plug-in post 211 is inserted into the plug-in hole 131, and the base 21 can be rotated with respect to the connection block 13, so that further adjustment can be achieved.

As shown in fig. 1 to 3 and fig. 9, in the present embodiment, the plug post 211 is a hemispherical structure, the plug hole 131 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. Specifically, when the implant is performed, the angle between the connection handle 10 and the connection frame 20 is adjusted through the insertion posts 211 and the insertion holes 131, and then locked by the screws. This allows the elbow prosthesis to fit bones of different sizes. The adjusting mode is simple and convenient to set. The diameter of the hemispherical structure is equal to the diameter of the hemispherical recess.

The connecting block 13 is provided with a plurality of first connecting holes, the periphery at the jack 131 is enclosed to a plurality of first connecting holes, be provided with a plurality of second connecting holes on the base member 21, a plurality of second connecting holes enclose the periphery at the spliced pole 211, a plurality of first connecting holes and a plurality of second connecting holes correspond the setting, a plurality of screws insert in corresponding first connecting holes and the second connecting holes in a one-to-one correspondence. The above-described arrangement of the plurality of first connection holes and the plurality of second connection holes enables the fixing base 21 and the connection block 13.

Specifically, after the angle adjustment is achieved through the plug post 211 and the plug hole 131, the angle adjustment is sequentially connected in the corresponding first connection hole and second connection hole through a plurality of screws, so that the fixation is achieved.

It should be noted that, after the angle is adjusted, there is dislocation of the corresponding first connecting hole and the second connecting hole, so that a plurality of screws need to penetrate into the corresponding first connecting hole and the corresponding second connecting hole which are not dislocated, namely, coarse connection is realized, and then the other corresponding first connecting holes and the other corresponding second connecting holes are connected through the screws.

The first connecting hole and the second connecting hole which are staggered have a certain overlapping part.

Specifically, fine adjustment is achieved between the pulley portion 30 and the connection handle 10 through the plug post 211 and the plug hole 131: when the left and right direction needs to be adjusted, the matching degree of the left and right 2 screws is adjusted, when the up and down direction needs to be adjusted, the matching degree of the up and down 2 screws is adjusted, the plug-in column 211 can rotate in the plug-in hole 131, and the position is allowed to be adjusted up and down, left and right, so that the purpose of fine adjustment of the pulley part 30 is achieved.

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 connection handle (10);

the connecting frame (20) is connected with the connecting handle (10), and the connecting frame (20) comprises a base body (21), and a first connecting arm (22) and a second connecting arm (23) which are connected with the base body (21) and are arranged at intervals;

a pulley part (30), wherein a connecting hole (31) is formed in the pulley part (30), the first connecting arm (22) is connected with the side part of the pulley part (30), and the second connecting arm (23) is inserted into the connecting hole (31);

and an adjusting structure (40) disposed between the connection hole (31) and the second connection arm (23) to adjust the depth of insertion of the second connection arm (23) into the connection hole (31).

2. The hemi-elbow joint prosthesis according to claim 1 wherein the adjustment structure (40) comprises a spline (41) and a rack (42), one of the spline (41) and the rack (42) being disposed on the second connecting arm (23), the other of the spline (41) and the rack (42) being disposed within the connecting aperture (31), the rack (42) and the spline (41) being disposed in meshing engagement.

3. The hemi-elbow joint prosthesis according to claim 2, wherein the second connecting arm (23) comprises a first side wall (231) and a second side wall (232), the line connecting the first side wall (231) and the second side wall (232) is perpendicular to the direction from the first connecting arm (22) to the second connecting arm (23), the rack (42) is disposed on the first side wall (231) and/or the second side wall (232), and the spline (41) is disposed in the connecting hole (31).

4. A semi-elbow joint prosthesis according to claim 3, wherein the second connecting arm (23) has a receiving space (233) therein, the first side wall (231) has a plurality of through holes (2311) formed therein at intervals, the rack (42) is disposed in the receiving space (233), and the rack (42) is retractably disposed in the through holes (2311) and has an outwardly extended locking position and an inwardly retracted avoidance position.

5. The hemi-elbow joint prosthesis according to claim 4 wherein the adjustment structure (40) further comprises a connecting rod (43) and a gear (44), the connecting rod (43) and the end of the rack (42) are connected, a plurality of teeth (431) are spaced on the connecting rod (43), the gear (44) and the connecting rod (43) are both disposed in the receiving space (233), the gear (44) is meshed with the teeth (431), and the rack (42) is driven to switch between the locking position and the avoiding position by the connecting rod (43).

6. The hemi-elbow joint prosthesis according to claim 5 wherein the adjustment structure (40) further comprises a locking member (50), the locking member (50) being connected between the gear wheel (44) and the second connecting arm (23).

7. The hemi-elbow joint prosthesis according to claim 6 wherein the gear (44) is provided with an adjustment slot (441) and a mounting hole (442), the mounting hole (442) is located on the bottom wall of the adjustment slot (441), the locking member (50) is located in the mounting hole (442), and a distance is provided between the locking member (50) and the notch of the adjustment slot (441).

8. The hemi-elbow joint prosthesis according to claim 5 wherein the second connecting arm (23) has a relief hole (234) on a sidewall thereof, the relief hole (234) being in communication with the receiving space (233), the gear (44) being disposed within the relief hole (234).

9. A hemi-elbow joint prosthesis according to claim 3 wherein the number of racks (42) is two and two racks (42) are provided on the first side wall (231) and the second side wall (232), respectively.

10. The hemi-elbow joint prosthesis according to claim 1, wherein a stop block (221) is provided on one side of the first connecting arm (22) far away from the connecting handle (10), the stop block (221) extends toward the second connecting arm (23), a stop block (222) is provided on the stop block (221), the stop block (222) is vertically provided, the stop block (222) is connected with the second connecting arm (23) and the stop block (221), an inner concave portion (32) is provided at an end of the pulley portion (30), a limiting groove (321) is provided in the inner concave portion (32), the stop block (221) is inserted into the inner concave portion (32), and the stop block (222) is inserted into the limiting groove (321).

11. The hemi-elbow joint prosthesis according to claim 1 wherein the stem (10) comprises a first stem body (11), a second stem body (12) and a connecting block (13), the first stem body (11) and the second stem body (12) being disposed at intervals and all disposed on the same surface of the connecting block (13), the length of the first stem body (11) being greater than the length of the second stem body (12).

12. The hemi-elbow joint prosthesis according to claim 11 wherein the second rod body (12) is provided with a plurality of bone grafting cartridges (121) spaced toward one side of the first rod body (11).

13. The hemi-elbow joint prosthesis according to claim 11 wherein the base body (21) is provided with a plug post (211), the connection block (13) is provided with a plug hole (131), the plug post (211) is inserted into the plug hole (131), and a locking member (50) is provided between the plug post (211) and the base body (21).