elbow prosthesis

Abstract

The application relates to the technical field of medical replacement prosthesis, in particular to an elbow joint prosthesis which comprises a humerus assembly, a ulna assembly and a hinged piece. The humerus assembly comprises a humerus stem and a first connecting part located at one end of the humerus stem, the first connecting part extends to form a spaced first branch and a second branch at the end away from the humerus stem; the ulna assembly comprises a ulna stem and a second connecting part located at one end of the ulna stem, a through hole is formed in the center of the second connecting part; and two hinged pieces, each of which comprises a main body part and a rotating part connected with one end face of the main body part, and a notch is formed in the circumferential side wall of each main body part. The two rotating parts are respectively inserted into the through hole, the two rotating parts are coaxially connected and adjacently arranged, the first branch is inserted and fixed into the notch of one of the hinged pieces, and the second branch is inserted and fixed into the notch of the other hinged piece. The application has the effect of prolonging the service life of the prosthesis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical replacement prosthesis, and particularly to an elbow joint prosthesis. BACKGROUND

[0002] At present, the elbow joint replacement prosthesis is mainly used for treating elbow joint diseases caused by trauma, bone tumor, rheumatoid arthritis, etc. The elbow joint replacement surgery can implant the elbow joint replacement prosthesis into the human body to replace the elbow joint part in the human body, so as to achieve the effect of relieving the pain of the patient and restoring the function of the elbow joint of the patient.

[0003] The existing Chinese patent with the publication number CN207152677U discloses an antibacterial elbow joint prosthesis, which comprises a humerus assembly, an ulna assembly, a rotating shaft, a bushing, a shaft sleeve and a locking screw. The bottom of the humerus assembly is provided with an axial hole extending in the transverse direction, and the axial hole is provided with the bushing. The upper end of the ulna assembly is provided with a transverse axial hole matched with the axial hole, and the transverse axial hole is provided with the shaft sleeve. The ulna assembly is arranged at the lower part of the humerus assembly, the rotating shaft passes through the axial hole and the transverse axial hole to realize the rotary connection of the ulna assembly and the humerus assembly, and the locking screw is used for fixation.

[0004] With regard to the related technology in the above, when the humerus assembly and the ulna assembly are respectively located in the human body, the humerus assembly and the ulna assembly are prone to interfere with the human tissue during disassembly or assembly, so that the elbow joint prosthesis is inconvenient to disassemble or assemble. SUMMARY

[0005] In order to facilitate the disassembly or assembly of the elbow joint prosthesis, the present application provides an elbow joint prosthesis.

[0006] The elbow joint prosthesis provided by the present application adopts the following technical scheme:

[0007] An elbow joint prosthesis comprises:

[0008] A humerus assembly comprises a humeral stem and a first connecting part at one end of the humeral stem, and the first connecting part extends to form a first branch part and a second branch part at the end away from the humeral stem.

[0009] An ulna assembly comprises an ulnar stem and a second connecting part at one end of the ulnar stem, and a through hole is formed in the center of the second connecting part.

[0010] Two hinge parts, each of which comprises a main body part and a rotating part connected to one end surface of the main body part, and a slot is formed in the circumferential side wall of each main body part. The two rotating parts are respectively inserted into the through hole, the two rotating parts are coaxially connected, and the two rotating parts are arranged adjacent to each other. The first branch part is inserted and fixed into the slot of one of the hinge parts, and the second branch part is inserted and fixed into the slot of the other hinge part.

[0011] By adopting the above technical solution, the first branch, the second branch and the two main bodies cooperate with each other, so that the humeral component can be easily connected or separated from the hinge, and the two rotating parts are respectively inserted into the through holes, so that the humeral component can be connected to the ulnar component through the hinge, which is conducive to the assembly or disassembly of the humeral component and the ulnar component.

[0012] Optionally, a first locking hole is respectively provided on the first branch and the second branch, a second locking hole is provided on the circumferential side wall of the main body, the extension direction of the second locking hole is perpendicular to the axial direction of the rotating part, the first locking hole is connected to the second locking hole, a locking piece is inserted into the second locking hole, and the locking piece passes through the second locking hole and is inserted into the first locking hole.

[0013] By adopting the above technical solution, the locking member, the first branch and the second branch cooperate with each other, so as to facilitate the connection between the main body and the first branch and the second branch, thereby facilitating the connection and fixation of the humeral component and the hinge member.

[0014] Optionally, the rotating part is hemispherical, a positioning hole is axially provided on the top of one of the rotating parts, and a positioning column is provided on the top of the other rotating part, and the positioning column is slidably inserted into the positioning hole at one end away from the rotating part.

[0015] By adopting the above technical solution, the positioning post is slidably inserted into the positioning hole, thereby facilitating the mutual connection of the two rotating parts and facilitating the movement of the two rotating parts along the axis of the positioning post.

[0016] Optionally, the elbow joint prosthesis further includes two buffers, each of which is bowl-shaped and includes a spherical groove, the two buffers are respectively inserted in the through hole and the two spherical grooves are respectively arranged back to back with each other, and each rotating part is inserted in the corresponding spherical groove.

[0017] By adopting the above technical solution, the rotating part is inserted into the corresponding spherical center groove, which is beneficial to increase the contact area between the rotating part and the buffer part, and to a certain extent reduces the possibility of wear between the rotating part and the buffer part, thereby helping to extend the service life of the elbow joint prosthesis.

[0018] Optionally, an annular convex edge is provided on the inner wall of the through hole, and the annular convex edge divides the through hole into a first through hole and a second through hole, wherein one of the buffer parts is inserted in the first through hole and the other buffer part is inserted in the second through hole.

[0019] By adopting the above technical solution, one buffer is inserted into the first through hole and the other buffer is inserted into the second through hole, which facilitates connecting or separating the buffer and the second connecting part, and is beneficial for assembling or disassembling the humeral component and the ulna component.

[0020] Optionally, there are two annular ridges, which are arranged relative to each other, and the two annular ridges divide the through hole into a third through hole. The third through hole is located between the first through hole and the second through hole. A snap-in block is provided on the side where the two buffers are close to each other, and the two snap-in blocks are respectively inserted into the third through hole, and the side of the snap-in block close to the buffer abuts against the annular ridge.

[0021] By adopting the above technical solution, the two clamping blocks are respectively inserted into the third through holes, so that the annular protrusion can limit the clamping blocks, thereby facilitating the connection and fixing of the buffer component to the second connecting portion.

[0022] Optionally, a rotating hole is opened on the clamping block along the axial direction of the spherical groove, the two rotating holes are connected to each other, the rotating holes are connected to the spherical groove, the positioning column is passed through the rotating hole, and there is a gap between the spherical groove and the rotating part.

[0023] By adopting the above technical solution, the positioning column is passed through the rotating hole, and there is a gap between the spherical groove and the rotating part, which is conducive to making the elbow joint prosthesis more fit the movement of the elbow joint without affecting the stability of the connection between the humeral component and the ulnar component.

[0024] Optionally, a limit baffle is provided at a position of the second connecting portion close to the ulna stem, and an outer wall of the limit baffle is in contact with a circumferential outer wall of the buffer component.

[0025] By adopting the above technical solution, the design of the limit baffle makes it difficult for the buffer to tilt in the direction away from the rotating shaft, which is beneficial to reduce the possibility of shaking after the buffer is connected to the second connecting part, and further helps to improve the stability of the connection between the buffer and the second connecting part.

[0026] Optionally, a limiting hole is formed on the second connecting portion, a limiting member is provided in the limiting hole, a positioning groove is formed on the circumferential outer wall of the buffer member, and the circumferential side wall of the limiting member is fitted with the inner wall of the positioning groove.

[0027] By adopting the above technical solution, the circumferential side wall of the limiter fits with the inner wall of the positioning groove, so that the limiter can limit the buffer, which is beneficial to reduce the possibility of the buffer rotating in the through hole and causing wear between the buffer and the second connecting part.

[0028] Optionally, chamfers are respectively provided on opposite sides of a connection between the humeral stem and the first connection portion.

[0029] By adopting the above technical solution, the rounded corner design reduces to a certain extent the possibility of opening additional holes in the human skeleton to accommodate the relatively sharp corners on the humeral component, which is conducive to preserving the bone as much as possible, and further helps to reduce the possibility of stress concentration at the sharp corners, which leads to easy wear between the humeral component and the bone.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. Through the mutual cooperation of the first branch, the second branch, the two main bodies and the locking member, the purpose of facilitating the assembly or disassembly of the humeral component and the ulna component is achieved;

[0032] 2. The cooperation between the rotating part and the buffer is conducive to increasing the contact area between the rotating part and the buffer, which to a certain extent reduces the possibility of wear between the rotating part and the buffer, thereby helping to extend the service life of the elbow joint prosthesis;

[0033] 3. Through the mutual cooperation of the second connecting part, the limiting part and the limiting baffle, the buffer part is not prone to shaking after being connected to the second connecting part, which is beneficial to improving the stability of the connection between the buffer part and the second connecting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the elbow joint prosthesis according to an embodiment of the present application.

[0035] Figure 2 It is a schematic diagram of the exploded structure of the elbow joint prosthesis according to an embodiment of the present application.

[0036] Figure 3 This is a schematic diagram of the exploded structure of the elbow joint prosthesis according to an embodiment of the present application from another perspective.

[0037] Figure 4 It is a cross-sectional view of the first connecting part, the second connecting part, the hinge and the buffer part after being connected in the embodiment of the present application.

[0038] Description of reference numerals:

[0039] 1. Humeral assembly; 11. Humeral stem; 12. First connecting portion; 121. First branch; 122. Second branch; 123. First locking hole; 13. Chamfered corner; 14. Flange; 2. Ulna assembly; 21. Ulna stem; 22. Second connecting portion; 221. Through hole; 2211. First through hole; 2212. Second through hole; 2213. Third through hole; 222. Annular ridge; 223. Limiting hole; 224. Limiting member; 225. Limiting baffle; 3. Hinge; 31. Main body; 311. Notch; 312. Second locking hole; 313. Locking member; 32. Rotating portion; 321. Positioning hole; 322. Positioning column; 4. Buffer; 41. Spherical groove; 42. Snap-in block; 421. Rotating hole; 43. Positioning groove. DETAILED DESCRIPTION

[0040] The following is combined with Figures 1-4 This application is described in further detail.

[0041] The embodiment of the present application discloses an elbow joint prosthesis.

[0042] Reference Figure 1 The elbow joint prosthesis includes a humeral component 1, an ulnar component 2, a hinge 3, and a buffer 4. The humeral component 1 is detachably connected to the hinge 3, the hinge 3 is rotatably connected to the buffer 4, and the buffer 4 is detachably connected to the ulnar component 2, thereby facilitating assembly or disassembly of the humeral component 1 and the ulnar component 2.

[0043] Reference Figure 1 The humeral component 1 includes a humeral stem 11 and a first connecting portion 12 located at one end of the humeral stem 11. A large angle is formed between the humeral stem 11 and the first connecting portion 12, and the size of the humeral stem 11 is smaller than that of the first connecting portion 12. The humeral stem 11 is designed to adapt to the human humerus and is used to be connected to the human humerus.

[0044] Reference Figure 1 Chamfers 13 are provided on opposite sides of the connection between the humeral stem 11 and the first connecting part 12, thereby reducing the possibility of needing to open additional holes on the human humerus near the chamfers 13 after the humeral component 1 is implanted in the humerus to accommodate the relatively sharp angle that exists when the connection between the humeral stem 11 and the first connecting part 12 is not provided with the chamfer 13, so that the human bone can be retained as much as possible, which is beneficial to reducing the possibility of stress concentration at the sharp corners, causing wear between the humeral component 1 and the human bone.

[0045] Reference Figure 2 The first connecting portion 12 extends from one end of the humeral stem 11 to form a first branch 121 and a second branch 122 spaced apart from each other. Both the first branch 121 and the second branch 122 are used to connect to the hinge 3 .

[0046] Reference Figure 1 A flange 14 is fixedly connected to the connection between the humeral stem 11 and the first connecting portion 12 . The flange 14 extends away from the first connecting portion 12 , and the extending direction of the flange 14 is the same as the length direction of the humeral stem 11 itself.

[0047] Reference Figure 1 An angle is formed between the flange 14 and the humeral stem 11, the size and shape of which are adapted to the design of the human humerus. When the humeral stem 11 is implanted into the human humerus, the flange 14 and the humeral stem 11 cooperate to clamp the human humerus, thereby improving the stability of the humeral stem 11 implanted into the human humerus and reducing the possibility of the humeral stem 11 becoming loose within the human humerus.

[0048] Reference Figure 2 A first locking hole 123 is respectively formed on the first branch 121 and the second branch 122 , and the first locking hole 123 is arranged away from the humeral stem 11 .

[0049] Reference Figure 2 The hinge 3 may be provided with a plurality of hinges. In this embodiment, there are two hinges 3, which are arranged opposite to each other. Each hinge 3 includes a main body 31 and a rotating part 32 connected to one end surface of the main body 31.

[0050] Reference Figure 2 The main body 31 has slots 311 extending through the circumferential sidewall thereof. The slots 311 also extend through one end of the main body 31 away from the rotating portion 32. The first branch 121 is inserted into one of the slots 311, and the second branch 122 is inserted into the other slot 311, thereby facilitating the connection between the humeral assembly 1 and the hinge 3.

[0051] Reference Figure 2 The shape of the slot 311 adapts to the shape design of the first branch 121 and the second branch 122, so that the outer wall of the first branch 121 can fit with the inner wall of the slot 311, and the outer wall of the second branch 122 can also fit with the inner wall of the slot 311, thereby making it difficult for the first branch 121 and the second branch 122 to shake in the slot 311.

[0052] Reference Figure 2 A second locking hole 312 is defined on the circumferential sidewall of the main body 31. The second locking hole 312 extends perpendicularly to the axial direction of the rotating portion 32 and communicates with the notch 311. A locking member 313 is inserted into the second locking hole 312. The locking member 313 can be configured in various ways. In this embodiment, the locking member 313 is a locking bolt.

[0053] Reference Figure 2When the first branch 121 and the second branch 122 are inserted into the slot 311, the first locking hole 123 is connected to the second locking hole 312, and the locking member 313 passes through the second locking hole 312 and is inserted into the first locking hole 123. The locking member 313 is used to fix the first branch 121 and the second branch 122 in the slot 311 respectively, thereby facilitating the connection and fixation of the humeral component 1 and the hinge 3.

[0054] Reference Figure 3 The shape of the rotating portion 32 can be set to various. In this embodiment, the rotating portion 32 is hemispherical. A positioning hole 321 is axially opened at the top of one of the two rotating portions 32. One end of the positioning hole 321 passes through the rotating portion 32 and communicates with the notch 311.

[0055] Reference Figure 4 The top of the rotating part 32 without the positioning hole 321 is fixedly connected with a positioning column 322, and the positioning column 322 is slidably inserted into the positioning hole 321 at one end of the rotating part 32 away from the positioning hole 321, and the length of the positioning column 322 inserted into the positioning hole 321 is less than the length of the positioning hole 321 itself, so that the positioning column 322 can slide in the positioning hole 321.

[0056] Reference Figure 4 The side wall of the positioning post 322 fits with the inner wall of the positioning hole 321 , so that the positioning post 322 is not likely to shake in the positioning hole 321 .

[0057] Reference Figure 3 The buffer member 4 can be provided with multiple, and in this embodiment, there are two buffer members 4, which are arranged opposite to each other. Each buffer member 4 is bowl-shaped and includes a spherical groove 41, and the two spherical grooves 41 are respectively arranged back to back with each other.

[0058] Reference Figure 3 The buffer member 4 can be made of a variety of materials. In this embodiment, the buffer member 4 is made of polyethylene material.

[0059] Reference Figure 3 The two buffer members 4 are fixedly connected to each other on one side thereof, with a clamping block 42 . The manufacturing material of the two clamping blocks 42 is the same as that of the buffer members 4 .

[0060] Reference Figure 3 The two clamping blocks 42 are respectively provided with rotating holes 421 extending through the axial direction of the spherical groove 41 . The rotating holes 421 are connected to the spherical groove 41 , and the two rotating holes 421 can be connected to each other.

[0061] Reference Figure 3The end of the rotating part 32 away from the main body part 31 can be inserted into the spherical groove 41, which is beneficial to increase the contact area between the rotating part 32 and the spherical groove 41, and the rotating part 32 can rotate in the spherical groove 41, which is beneficial to reduce the possibility of wear between the rotating part 32 and the buffer part 4.

[0062] Reference Figure 3 When the rotating part 32 is inserted into the spherical groove 41, the positioning hole 321 and the rotating hole 421 can be connected, so that the positioning column 322 can slide through the rotating hole 421, thereby making it difficult for the rotating part 32 to separate from the buffer 4, which is beneficial to improving the stability of the connection between the rotating part 32 and the buffer 4.

[0063] Reference Figure 1 The ulnar component 2 includes an ulnar stem 21 and a second connecting portion 22 located at one end of the ulnar stem 21, wherein the second connecting portion 22 is larger than the ulnar stem 21. The ulnar stem 21 is designed to adapt to the human ulna and is used to be connected to the human ulna.

[0064] Reference Figure 1 The ulnar stem 21 is designed with an internal rotation structure, so that the ulnar stem 21 can better fit the human ulna.

[0065] Reference Figure 3 A through hole 221 is formed through the center of the second connecting portion 22 , and an annular convex edge 222 is provided on the inner wall of the through hole 221 . The annular convex edge 222 divides the through hole 221 into a first through hole 2211 and a second through hole 2212 .

[0066] Reference Figure 3 There may be multiple annular protrusions 222. In this embodiment, there are two annular protrusions 222. The two annular protrusions 222 are arranged relative to each other, so that the two annular protrusions 222 can divide the through hole 221 into a third through hole 2213, and the third through hole 2213 is located between the first through hole 2211 and the second through hole 2212.

[0067] Reference Figure 3 One buffer member 4 can be inserted into the first through hole 2211, the other buffer member 4 can be inserted into the second through hole 2212, and the two clamping blocks 42 can be respectively inserted into the third through hole 2213. The two clamping blocks 42 are arranged such that their sides facing away from each other abut against the side of the annular ridge 222 away from the buffer member 4, thereby facilitating the connection and fixing of the buffer member 4 to the second connecting portion 22.

[0068] Reference Figure 3 A limiting hole 223 is further formed through the second connecting portion 22 . The axis of the limiting hole 223 is parallel to the axis of the through hole 221 , and the limiting hole 223 is connected to the through hole 221 .

[0069] Reference Figure 3 A limiting member 224 is inserted into the limiting hole 223. There may be multiple limiting members 224. In this embodiment, there are two limiting members 224, which are arranged opposite to each other. There may be multiple limiting members 224. In this embodiment, the limiting member 224 is a limiting bolt.

[0070] Reference Figure 3 A positioning groove 43 is formed on the circumferential outer wall of the buffer member 4 , and the opening direction of the positioning groove 43 is parallel to the axis of the rotating hole 421 .

[0071] Reference Figure 3 When the buffer 4 is connected to the second connecting part 22, the positioning groove 43 is connected to the limiting hole 223, and the circumferential side wall of the limiting part 224 fits with the inner wall of the positioning groove 43, so that the buffer 4 is not easy to rotate around the axis of the through hole 221 on the second connecting part 22, which is beneficial to reduce the possibility of the buffer 4 rotating in the through hole 221 and causing wear between the buffer 4 and the second connecting part 22.

[0072] Reference Figure 3 A limit baffle 225 is provided at a position of the second connecting portion 22 near the ulnar stem 21. The shape of the limit baffle 225 can be set to various shapes. In this embodiment, the limit baffle 225 is an arc plate, and the radius of the limit baffle 225 is the same as the radius of the through hole 221.

[0073] Reference Figure 3 When the buffer 4 is connected to the second connecting part 22, the concave side wall of the limit baffle 225 fits with the circumferential outer wall of the buffer 4, which is beneficial to reduce the possibility of the buffer 4 shaking after the buffer 4 is connected to the second connecting part 22, and further helps to improve the connection stability between the buffer 4 and the second connecting part 22.

[0074] Reference Figure 3 When the first connection part 12 is connected to the hinge 3, the second connection part 22 is connected to the buffer 4, and the hinge 3 is connected to the buffer 4, the first connection part 12 and the second connection part 22 can swing relative to each other.

[0075] Reference Figure 3 There is a gap between the outer wall of the rotating part 32 and the inner wall of the spherical groove 41, so that the humeral component 1 and the ulna component 2 can be relaxed inward or outward at a certain angle without affecting the connection stability of the hinge 3 and the buffer 4, so that the elbow joint prosthesis can better fit the movement of the human elbow joint.

[0076] Reference ​Through the mutual cooperation of the hinge part and the buffer part, the humeral components 1 and ulnar components 2 of different sizes can be connected to each other, so that the elbow joint prosthesis can adapt to replace human elbow joints of different shapes and sizes, which is beneficial to improving the adaptability of the elbow joint prosthesis.

[0077] The implementation principle of an elbow joint prosthesis in an embodiment of the present application is: when the elbow joint prosthesis needs to be implanted into the human body, the humeral stem 11 is first implanted into the patient's humerus, and the patient's humerus is clamped between the flange 14 and the humeral stem 11, and the ulnar stem 21 is implanted into the patient's ulna.

[0078] Then, the buffer member 4 is inserted into the through hole 221, the engaging block 42 is inserted into the third through hole 2213, and the limiting member 224 is inserted into the limiting hole 223. The rotating portion 32 is then inserted into the spherical groove 41, and the positioning post 322 is inserted into the rotating hole 421. At this time, the positioning post 322 passes through the through hole 221 and is inserted into the positioning hole 321.

[0079] Finally, the first branch 121 is inserted into the slot 311 , the second branch 122 is inserted into the other slot 311 , and the locking member 313 is inserted into the first locking hole 123 and the second locking hole 312 respectively, thereby completing the installation of the elbow joint prosthesis.

[0080] The elbow joint prosthesis of this embodiment facilitates the assembly or disassembly of the humeral component 1 and the ulna component 2 by means of the mutual cooperation of the first branch 121 , the second branch 122 , the two main bodies 31 and the locking member 313 .

[0081] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An elbow joint prosthesis, characterized in that: include: A humeral assembly (1) comprises a humeral stem (11) and a first connecting portion (12) located at one end of the humeral stem (11), wherein the first connecting portion (12) extends away from the end of the humeral stem (11) to form a first branch (121) and a second branch (122) spaced apart from each other; An ulnar component (2) comprises an ulnar stem (21) and a second connecting portion (22) located at one end of the ulnar stem (21), wherein a through hole (221) is provided through the center of the second connecting portion (22); and Two hinged parts (3), each hinged part (3) comprising a main body (31) and a rotating part (32) connected to one end face of the main body (31), a slot (311) being provided on a circumferential side wall of each main body (31), the two rotating parts (32) being respectively inserted into the through hole (221), the two rotating parts (32) being coaxially connected and adjacently arranged, the first branch (121) being inserted and fixed into the slot (311) of one of the hinged parts (3), and the second branch (122) being inserted and fixed into the slot (311) of the other hinged part (3); The rotating part (32) is hemispherical, a positioning hole (321) is provided at the top of one of the rotating parts (32) along the axial direction, and a positioning column (322) is provided at the top of the other rotating part (32), and the positioning column (322) is slidably inserted into the positioning hole (321) at one end away from the rotating part (32); The elbow joint prosthesis further comprises two buffer members (4), each of the buffer members (4) being bowl-shaped and comprising a spherical groove (41), the two buffer members (4) being respectively inserted into the through hole (221) and the two spherical grooves (41) being respectively arranged back to back with each other, each of the rotating parts (32) being inserted into the corresponding spherical groove (41), and a gap being present between the outer wall of the rotating part (32) and the inner wall of the spherical groove (41), so that the humeral component (1) and the ulnar component (2) can be relaxed inwardly or outwardly by a certain angle.

2. The elbow joint prosthesis according to claim 1, characterized in that A first locking hole (123) is respectively provided on the first branch (121) and the second branch (122), and a second locking hole (312) is provided on the circumferential side wall of the main body (31). The extension direction of the second locking hole (312) is perpendicular to the axial direction of the rotating part (32). The first locking hole (123) is communicated with the second locking hole (312). A locking member (313) is inserted into the second locking hole (312), and the locking member (313) passes through the second locking hole (312) and is inserted into the first locking hole (123).

3. The elbow joint prosthesis according to claim 1, characterized in that An annular convex edge (222) is provided on the inner wall of the through hole (221), and the annular convex edge (222) divides the through hole (221) into a first through hole (2211) and a second through hole (2212), wherein one of the buffer components (4) is inserted into the first through hole (2211), and the other buffer component (4) is inserted into the second through hole (2212).

4. The elbow joint prosthesis according to claim 3, characterized in that: Two annular convex edges (222) are provided, and the two annular convex edges (222) are arranged at a relative interval. The two annular convex edges (222) further divide the through hole (221) of the second connecting portion (22) into a third through hole (2213). The third through hole (2213) is located between the first through hole (2211) and the second through hole (2212). A clamping block (42) is provided on the side of the two buffer members (4) close to each other. The two clamping blocks (42) are respectively inserted into the third through hole (2213), and the side of the clamping block (42) close to the buffer member (4) abuts against the annular convex edge (222).

5. The elbow joint prosthesis according to claim 4, characterized in that: A rotating hole (421) is provided on the clamping block (42) along the axial direction of the spherical groove (41), the two rotating holes (421) are connected to each other, the rotating holes (421) are connected to the spherical groove (41), and the positioning column (322) is inserted into the rotating hole (421).

6. The elbow joint prosthesis according to claim 1, characterized in that A limit baffle (225) is provided at a position of the second connecting portion (22) close to the ulna stem (21), and an outer wall of the limit baffle (225) is fitted with a circumferential outer wall of the buffer component (4).

7. The elbow joint prosthesis according to claim 1, characterized in that A limiting hole (223) is provided through the second connecting portion (22), a limiting member (224) is provided in the limiting hole (223), a positioning groove (43) is provided on the circumferential outer wall of the buffer member (4), and the circumferential side wall of the limiting member (224) is in contact with the inner wall of the positioning groove (43).

8. The elbow joint prosthesis according to claim 1, characterized in that Rounded corners (13) are respectively provided on opposite sides of the connection between the humeral stem (11) and the first connecting portion (12).

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