阅读说明：本技术 腕关节假体 (Wrist joint prosthesis ) 是由 马骏 于 2021-11-17 设计创作，主要内容包括：本发明提供了一种腕关节假体,包括：关节面假体；桡骨假体,与关节面假体的第一端角度可调节地连接；尺骨假体,与关节面假体的第二端可转动地连接；角度调节装置,设置在关节面假体和桡骨假体之间以调节桡骨假体和关节面假体之间的角度。本申请的技术方案能够有效地解决相关技术中的桡骨关节面向掌侧的倾斜角固定设计造成部分患者腕关节的掌屈或背伸活动度受限问题。(The invention provides a wrist joint prosthesis comprising: an articular facet prosthesis; a radius prosthesis angularly adjustably connected to the first end of the articular surface prosthesis; an ulnar prosthesis rotatably coupled to the second end of the articular surface prosthesis; and the angle adjusting device is arranged between the articular surface prosthesis and the radial prosthesis so as to adjust the angle between the radial prosthesis and the articular surface prosthesis. The technical scheme of the application can effectively solve the problem that the limited motion degree of palmar flexion or dorsal extension of partial wrist joints of patients is caused by the inclined angle fixing design of the radial joint facing the palmar side in the related technology.)

1. A wrist prosthesis, comprising:

an articular facet prosthesis (10);

a radial prosthesis (20) angularly adjustably connected to a first end of said articular surface prosthesis (10);

an ulnar prosthesis (30) rotatably connected to the second end of the articular surface prosthesis (10);

an angle adjustment device (40) disposed between the articular surface prosthesis (10) and the radial prosthesis (20) to adjust an angle between the radial prosthesis (20) and the articular surface prosthesis (10).

2. The wrist prosthesis according to claim 1, characterized in that the angle adjustment means (40) comprises a first adjustment portion (41) connected to a first end of the articular surface prosthesis (10) and a second adjustment portion (42) connected to a first end of the radius prosthesis (20), the first adjustment portion (41) and the second adjustment portion (42) being rotationally engaged, the angle adjustment means (40) further comprising a locking structure (43) locking the first adjustment portion (41) to the second adjustment portion (42).

3. The wrist joint prosthesis according to claim 2, wherein the first adjustment portion (41) includes a first mounting seat (411) and a pivot hole (412) provided on the first mounting seat (411), the second adjustment portion (42) includes a second mounting seat (421) and a rotation shaft (422) provided on the second mounting seat (421), and the rotation shaft (422) is inserted into the pivot hole (412).

4. The wrist prosthesis according to claim 3, characterized in that the axis of the rotation shaft (422) is arranged crosswise to the axis of the radius prosthesis (20).

5. The wrist joint prosthesis according to claim 3, characterized in that the locking structure (43) includes a first threaded section (431) provided at the free end of the rotation shaft (422) and a nut (432) engaged with the first threaded section (431), the nut (432) being engaged in abutment with the first adjustment portion (41).

6. Wrist joint prosthesis according to claim 1, characterized in that the articular surface prosthesis (10) comprises a first articular surface prosthesis (11) and a second articular surface prosthesis (12), between which first articular surface prosthesis (11) and second articular surface prosthesis (12) a joint socket (13) is arranged, and that the ulnar prosthesis (30) is provided at its first end with a ball head (311) rotatably located in the joint socket (13).

7. The wrist joint prosthesis according to claim 6, characterized in that the articular surface prosthesis (10) further comprises a first fastener (14) disposed between the first articular surface prosthesis (11) and the second articular surface prosthesis (12).

8. The wrist joint prosthesis according to any one of claims 1 to 7,

the second end of the radius prosthesis (20) is provided with a plurality of first anti-rotation convex ridges (221) which are uniformly distributed along the circumferential direction of the radius prosthesis (20); and/or

The second end of the ulnar prosthesis (30) is provided with a plurality of second anti-rotation convex ridges (321) which are uniformly distributed along the circumferential direction of the ulnar prosthesis (30).

9. The wrist joint prosthesis according to any one of claims 1 to 7,

the radius prosthesis (20) comprises a first radius prosthesis (21) and a second radius prosthesis (22), the first radius prosthesis (21) is arranged between the second radius prosthesis (22) and the joint surface prosthesis (10), a second threaded section (211) is arranged on the first radius prosthesis (21), and a first threaded hole (222) matched with the second threaded section (211) is arranged on the second radius prosthesis (22);

the second thread section (211) is provided with a first fixing groove (212) extending along the height direction of the radial prosthesis (20), the second radial prosthesis (22) is provided with a first fixing hole (223), and the radial prosthesis (20) further comprises a second fastener (23) penetrating through the first fixing groove (212) and the first fixing hole (223).

10. The wrist joint prosthesis according to any one of claims 1 to 7,

the ulnar prosthesis (30) comprises a first ulnar prosthesis (31) and a second ulnar prosthesis (32), the first ulnar prosthesis (31) is arranged between the second ulnar prosthesis (32) and the articular surface prosthesis (10), a third threaded section (312) is arranged on the first ulnar prosthesis (31), and a second threaded hole (322) matched with the third threaded section (312) is arranged on the second ulnar prosthesis (32);

the third thread section (312) is provided with a second fixing groove (313) extending along the height direction of the ulnar prosthesis (30), the second ulnar prosthesis (32) is provided with a second fixing hole (323), and the ulnar prosthesis (30) further comprises a third fastener (33) penetrating through the second fixing groove (313) and the second fixing hole (323).

Technical Field

The invention relates to the technical field of prostheses, in particular to a wrist joint prosthesis.

Background

The distal bone tumor of radius and ulna is one of the common diseases in orthopedics, the tumor section needs to be removed by operation, and after the tumor section is removed by the operation, the structure of the wrist joint is reconstructed by adopting autologous fibula transplantation or artificial prosthesis and the like to recover the function of the wrist joint. However, the existing autologous fibula transplantation or wrist joint prosthesis only can reconstruct the distal radius, and the ulna head is cut off when the tumor invades the ulna at the same time, so that the method is feasible when the tumor invasion range is small. However, in the case of a large tumor invasion range, a large bone defect can be caused after a large-range tumor is removed. After the large ulna distal segment is cut off, if reconstruction is not carried out, the wrist joint stability is difficult to obtain by the reconstruction of the radius distal end alone; meanwhile, the resection of the large ulna can also affect the appearance of the upper limb of the patient, and can cause adverse effects on the psychology of the patient.

In addition, the radial joint of the human body faces the palm side and has an inclination angle of 9-20 degrees, and the palm inclination angles of different patients are different. Implantation of a prosthesis in a patient at a different angle to its original inclination of the palm may result in the patient's wrist joint experiencing impaired volar or dorsiflexion activity after implantation of the prosthesis.

Disclosure of Invention

The invention mainly aims to provide a wrist joint prosthesis, which solves the problem that the limited motion degree of palmar flexion or dorsal extension of partial wrist joints of patients is caused by the inclined angle fixing design of the radial joint facing the palm side in the related art.

In order to achieve the above object, the present invention provides a wrist joint prosthesis comprising: an articular facet prosthesis; a radius prosthesis angularly adjustably connected to the first end of the articular surface prosthesis; an ulnar prosthesis rotatably coupled to the second end of the articular surface prosthesis; and the angle adjusting device is arranged between the articular surface prosthesis and the radial prosthesis so as to adjust the angle between the radial prosthesis and the articular surface prosthesis.

Furthermore, the angle adjusting device comprises a first adjusting part connected with the first end of the articular surface prosthesis and a second adjusting part connected with the first end of the radius prosthesis, the first adjusting part and the second adjusting part are in running fit, and the angle adjusting device further comprises a locking structure for locking the first adjusting part on the second adjusting part.

Further, the first adjusting portion comprises a first mounting seat and a pivot hole formed in the first mounting seat, the second adjusting portion comprises a second mounting seat and a rotating shaft arranged on the second mounting seat, and the rotating shaft penetrates through the pivot hole.

Further, the axis of the rotating shaft is crossed with the axis of the radius prosthesis.

Further, locking structure is including setting up the first screw thread section at the free end of pivot and with first screw thread section complex nut, nut and the cooperation of first regulation portion butt.

Further, the articular surface prosthesis comprises a first articular surface prosthesis and a second articular surface prosthesis, a joint socket is arranged between the first articular surface prosthesis and the second articular surface prosthesis, and a ball head which is rotatably positioned in the joint socket is arranged at the first end of the ulnar prosthesis.

Further, the articular surface prosthesis also includes a first fastener disposed between the first articular surface prosthesis and the second articular surface prosthesis.

Further, the second end of the radial prosthesis is provided with a plurality of first anti-rotation convex ridges which are uniformly distributed along the circumferential direction of the radial prosthesis; and/or the second end of the ulnar prosthesis is provided with a plurality of second anti-rotation convex ridges which are uniformly distributed along the circumferential direction of the ulnar prosthesis.

Further, the radius prosthesis comprises a first radius prosthesis and a second radius prosthesis, the first radius prosthesis is arranged between the second radius prosthesis and the joint surface prosthesis, a second thread section is arranged on the first radius prosthesis, and a first threaded hole matched with the second thread section is arranged on the second radius prosthesis; the second thread section is provided with a first fixing groove extending along the height direction of the radius prosthesis, the second radius prosthesis is provided with a first fixing hole, and the radius prosthesis further comprises a second fastener penetrating through the first fixing groove and the first fixing hole.

Furthermore, the ulnar prosthesis comprises a first ulnar prosthesis and a second ulnar prosthesis, the first ulnar prosthesis is arranged between the second ulnar prosthesis and the joint surface prosthesis, a third thread section is arranged on the first ulnar prosthesis, and a second thread hole matched with the third thread section is arranged on the second ulnar prosthesis; the third thread section is provided with a second fixing groove extending along the height direction of the ulnar prosthesis, the second ulnar prosthesis is provided with a second fixing hole, and the ulnar prosthesis further comprises a third fastener penetrating through the second fixing groove and the second fixing hole.

By applying the technical scheme of the invention, the wrist joint prosthesis comprises: articular surface prosthesis, radius prosthesis, ulna prosthesis and angle adjusting device. Specifically, one side of the articular surface prosthesis, which is far away from the radius prosthesis and the ulna prosthesis, can be matched with the scapula, the moon and the triquetrum on the volar side to realize the volar flexion or dorsal extension movement of the wrist joint. The radius prosthesis is connected with the first end of the joint surface prosthesis in an angle adjustable mode, so that the angle between the radius prosthesis and the joint surface prosthesis can be adjusted to adapt to the palm inclination angles of different patients when the prosthesis is implanted, the joint surface prosthesis can have high matching degree with the healthy bone of the patients, and the palm bending or back stretching mobility of the wrist joint of the patients after the prosthesis is implanted is equivalent to the mobility of the patients in the healthy state. Therefore, the technical scheme of the application can effectively solve the problem that the limited motion degree of the palmflexion or the dorsal extension of part of the wrist joints of the patient caused by the inclined angle fixing design of the radial joint facing the palmar side in the related art.

Drawings

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

figure 1 shows a schematic perspective view of an embodiment of a wrist joint prosthesis according to the invention;

FIG. 2 shows a schematic perspective view of another angle of the wrist prosthesis of FIG. 1;

FIG. 3 shows an exploded schematic view of the wrist prosthesis of FIG. 1;

FIG. 4 shows a perspective view of a first articular surface prosthesis of the wrist prosthesis of FIG. 1;

FIG. 5 shows a perspective view of a second articular surface prosthesis of the wrist prosthesis of FIG. 1;

FIG. 6 is an exploded schematic view of a radius prosthesis of the wrist prosthesis of FIG. 1; and

figure 7 shows an exploded view of the ulnar prosthesis of the wrist prosthesis of figure 1.

Wherein the figures include the following reference numerals:

10. an articular facet prosthesis; 11. a first articular facet prosthesis; 12. a second articular facet prosthesis; 13. a glenoid fossa; 14. a first fastener; 20. a radius prosthesis; 21. a first radius prosthesis; 211. a second thread segment; 212. a first fixing groove; 22. a second radius prosthesis; 221. a first anti-spin convex ridge; 222. a first threaded hole; 223. a first fixing hole; 23. a second fastener; 30. an ulnar prosthesis; 31. a first ulnar prosthesis; 311. a ball head; 312. a third thread segment; 313. a second fixing groove; 32. a second ulnar prosthesis; 321. a second anti-spin convex ridge; 322. a second threaded hole; 323. a second fixing hole; 33. a third fastener; 40. an angle adjusting device; 41. a first adjusting section; 411. a first mounting seat; 412. a pivot hole; 42. a second regulating part; 421. a second mounting seat; 422. a rotating shaft; 43. a locking structure; 431. a first thread segment; 432. and a nut.

Detailed Description

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

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

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

As shown in fig. 1 and 2, in the present embodiment, the wrist joint prosthesis includes: an articular facet prosthesis 10, a radius prosthesis 20, an ulna prosthesis 30, and an angle adjustment device 40. Specifically, the radius prosthesis 20 is angularly adjustably connected to a first end of the articular surface prosthesis 10; the ulnar prosthesis 30 is rotatably connected to the second end of the articular facet prosthesis 10; an angle adjusting means 40 is provided between the articular surface prosthesis 10 and the radial prosthesis 20 to adjust the angle between the radial prosthesis 20 and the articular surface prosthesis 10.

Applying the technical solution of this embodiment, the wrist joint prosthesis comprises: an articular facet prosthesis 10, a radius prosthesis 20, an ulna prosthesis 30, and an angle adjustment device 40. Specifically, the side of the articular surface prosthesis 10 away from the radial prosthesis 20 and the ulnar prosthesis 30 can cooperate with the metacarpal scapula, lunate and triquetrum to realize the metacarpal flexion or dorsal extension of the wrist joint. The radius prosthesis 20 is connected with the first end of the articular surface prosthesis 10 in an angle adjustable mode, so that the angle between the radius prosthesis 20 and the articular surface prosthesis 10 can be adjusted to adapt to the inclination angle of palms of different patients when the prosthesis is implanted, the articular surface prosthesis 10 has high matching degree with healthy bones of the patients, and the palmar flexion or dorsal extension mobility of wrist joints of the patients after the prosthesis is implanted is equivalent to the mobility of the patients in a healthy state. Therefore, the technical scheme of the embodiment can effectively solve the problem that the limited motion degree of the volar flexion or the dorsal extension of part of the wrist joints of the patient is caused by the inclined angle fixing design of the radial joint facing the volar side in the related art.

Meanwhile, the wrist joint prosthesis of the embodiment further comprises an ulna prosthesis 30 rotatably connected with the second end of the articular surface prosthesis 10, and aiming at a patient with a large tumor invasion range of the ulna distal end, the ulna prosthesis 30 can reconstruct the ulna distal end of the patient, so that the stability of the wrist joint of the patient after the prosthesis is implanted is ensured. Meanwhile, the ulna prosthesis 30 is arranged, so that the shape of the wrist joint prosthesis of the patient after the prosthesis is implanted is similar to that of the wrist joint of the patient in a healthy state, and the influence of the appearance shape change of the upper limbs of the patient after the prosthesis is implanted on the psychology of the patient can be effectively reduced.

It should be noted that, in the present embodiment, the radius prosthesis 20 and the ulna prosthesis 30 each have a columnar structure. The above-mentioned "second end of the articular surface prosthesis 10" and "first end of the articular surface prosthesis 10" do not refer to the two opposite end surfaces of the articular surface prosthesis 10, but to a portion of the columnar structure. Meanwhile, the phrase "the radial prosthesis 20 is angularly adjustably connected to the first end of the articular surface prosthesis 10" means that the angle between the radial prosthesis 20 and a certain surface defined on the articular surface prosthesis 10 (for example, the end surface of the articular surface prosthesis 10 facing the radial prosthesis 20) is adjustable.

As shown in fig. 3 to 5, in the present embodiment, the angle adjusting means 40 includes a first adjusting portion 41 connected to the first end of the articular surface prosthesis 10 and a second adjusting portion 42 connected to the first end of the radius prosthesis 20, the first adjusting portion 41 and the second adjusting portion 42 are rotatably engaged, and the angle adjusting means 40 further includes a locking structure 43 for locking the first adjusting portion 41 to the second adjusting portion 42. When the wrist joint prosthesis is implanted, the first adjusting part 41 and the second adjusting part 42 are relatively rotated to enable the inclination angle of the articular surface prosthesis 10 relative to the radial prosthesis 20 to be matched with the original palm inclination angle of a patient, after the proper angle is adjusted, the first adjusting part 41 and the second adjusting part 42 are locked by the locking structure 43, so that the first adjusting part 41 and the second adjusting part 42 cannot move relatively, and the stability of the prosthesis after implantation is ensured.

As shown in fig. 3, in the present embodiment, the first adjusting portion 41 includes a first mounting seat 411 and a pivot hole 412 disposed on the first mounting seat 411, the second adjusting portion 42 includes a second mounting seat 421 and a rotating shaft 422 disposed on the second mounting seat 421, and the rotating shaft 422 penetrates through the pivot hole 412. The angle adjustment between the articular surface prosthesis 10 and the radius prosthesis 20 is realized through the rotation fit between the pivot hole 412 and the rotating shaft 422, and the structure is simple and the adjustment is easy.

Of course, in other possible embodiments, the first adjusting part and the radial prosthesis can be connected, and the second adjusting part and the articular surface prosthesis can be connected, so that the angle adjustment between the articular surface prosthesis and the radial prosthesis can be realized.

As shown in fig. 1, 3 and 6, in the present embodiment, the axis of the rotating shaft 422 is disposed to intersect with the axis of the radial prosthesis 20. Thus, when the shaft 422 rotates relative to the pivot hole 412, the angle between the radius prosthesis 20 and the articular surface prosthesis 10 changes.

As shown in fig. 3 and 6, the locking structure 43 includes a first threaded section 431 provided at the free end of the rotating shaft 422 and a nut 432 engaged with the first threaded section 431, and the nut 432 is engaged in abutment with the first adjusting portion 41. The locking between the first adjusting part 41 and the second adjusting part 42 is realized through thread matching, and then the locking between the radius prosthesis 20 and the articular surface prosthesis 10 is realized, and the structure is simple. As shown in fig. 3, in the present embodiment, the nut 432 and the first adjusting portion 41 are provided with a spacer, reducing the pressure between the nut 432 and the first adjusting portion 41 and securing the locking effect.

As shown in fig. 1 to 5, in the present embodiment, the articular surface prosthesis 10 includes a first articular surface prosthesis 11 and a second articular surface prosthesis 12, a joint socket 13 is provided between the first articular surface prosthesis 11 and the second articular surface prosthesis 12, and a ball head 311 rotatably positioned in the joint socket 13 is provided at a first end of the ulnar prosthesis 30. Specifically, the first articular surface prosthesis 11 and the second articular surface prosthesis 12 are respectively provided with spherical grooves, the two spherical grooves are butted to form the articular socket 13, and the ball head 311 is arranged in the articular socket 13, so that the ulnar prosthesis 30 can rotate relative to the articular surface prosthesis 10, and the flexibility of the wrist joint of the patient after the prosthesis is implanted is ensured.

In this embodiment, the end of the first articular surface prosthesis 11 away from the radial prosthesis 20 has a concave curved surface structure similar to the structure of the distal radius of the human body.

In this embodiment, the ball 311 is made of an abrasion-resistant material such as ultra-high molecular weight polyethylene, so as to ensure the abrasion resistance of the ball 311. The ball head 311 is fixed at one end of the radius prosthesis 20 close to the articular surface prosthesis 10 in a taper fit mode and the like, and the ball head 311 and the glenoid fossa 13 form a spherical-acetabular articular surface.

As shown in fig. 3, in this embodiment, the articular surface prosthesis 10 further includes a first fastener 14 disposed between the first articular surface prosthesis 11 and the second articular surface prosthesis 12. The first fastener 14 enables the first articular surface prosthesis 11 and the second articular surface prosthesis 12 to be fixedly connected to form a whole. Specifically, in this embodiment, the first fastening member 14 includes two screws, two threaded holes are provided on the first articular surface prosthesis 11, two countersunk holes are provided at corresponding positions on the second articular surface prosthesis 12, and the two screws are respectively inserted into the corresponding threaded holes and countersunk holes. The first articular surface prosthesis 11 and the second articular surface prosthesis 12 are fastened by matching screws and threaded holes, and the fixture has the advantages of simple structure, easiness in processing and good fastening effect.

After the first articular surface prosthesis 11 and the second articular surface prosthesis 12 are fixed by the first fastener 14, the spherical grooves on the first articular surface prosthesis 11 and the second articular surface prosthesis 12 form a ball socket (i.e. the joint socket 13), and the ball head 311 is wrapped to form a ball-and-socket joint surface.

As shown in fig. 3, 6 and 7, the second end of the radial prosthesis 20 is provided with a plurality of first anti-rotation convex ridges 221 uniformly distributed along the circumference of the radial prosthesis 20; the second end of the ulnar prosthesis 30 is provided with a plurality of second rotation preventing convex ridges 321 uniformly distributed along the circumferential direction of the ulnar prosthesis 30. It should be noted that the second end of the radial prosthesis 20 is a segment of the radial prosthesis 20 away from the articular surface prosthesis 10, and the second end of the ulnar prosthesis 30 is a segment of the ulnar prosthesis 30 away from the articular surface prosthesis 10. The second end of the radial prosthesis 20 is insertable into the medullary canal of the radius of the patient for fixation of the radial prosthesis 20, and the second end of the ulnar prosthesis 30 is insertable into the medullary canal of the ulna of the patient for fixation of the ulnar prosthesis 30. The plurality of first anti-rotation convex ridges 221 are uniformly arranged at the second end of the radius prosthesis 20, and the second anti-rotation convex ridges 321 are uniformly arranged at the second end of the ulna prosthesis 30, so that the radius prosthesis 20 and the ulna prosthesis 30 can be prevented from rotating relative to healthy bone of a patient, and the fixing effect and the stability of the wrist joint prosthesis after the prosthesis is implanted are ensured. Meanwhile, the first anti-rotation convex ridge 221 and the second anti-rotation convex ridge 321 increase the contact area of the wrist joint prosthesis and healthy bone of a patient, and the later-stage bone ingrowth is facilitated.

As shown in fig. 1 to 3 and fig. 6, in the present embodiment, the radius prosthesis 20 includes a first radius prosthesis 21 and a second radius prosthesis 22, the first radius prosthesis 21 is disposed between the second radius prosthesis 22 and the articular surface prosthesis 10, the first radius prosthesis 21 is provided with a second threaded section 211, and the second radius prosthesis 22 is provided with a first threaded hole 222 which is matched with the second threaded section 211; the second thread section 211 is provided with a first fixing groove 212 extending along the height direction of the radius prosthesis 20, the second radius prosthesis 22 is provided with a first fixing hole 223, and the radius prosthesis 20 further comprises a second fastening member 23 penetrating through the first fixing groove 212 and the first fixing hole 223. The radius prosthesis 20 is provided with two sections of split structures (a first radius prosthesis 21 and a second radius prosthesis 22), and the first radius prosthesis 21 and the second radius prosthesis 22 are in threaded fit, so that the length of the radius prosthesis 20 can be adjusted to meet the requirements of different patients. By inserting the second fastening member 23 into the first fixing hole 223 and the first fixing groove 212, the second threaded section 211 is prevented from rotating relative to the first threaded hole 222 after the adjustment of the length of the radial prosthesis 20 is completed, so that the length of the radial prosthesis 20 is changed, and the stability of the prosthesis after implantation is ensured.

As shown in fig. 1 to 3 and 7, in the present embodiment, the ulnar prosthesis 30 includes a first ulnar prosthesis 31 and a second ulnar prosthesis 32, the first ulnar prosthesis 31 is disposed between the second ulnar prosthesis 32 and the articular surface prosthesis 10, the first ulnar prosthesis 31 is provided with a third threaded section 312, and the second ulnar prosthesis 32 is provided with a second threaded hole 322 which is matched with the third threaded section 312; the third thread section 312 is provided with a second fixing groove 313 extending along the height direction of the ulnar prosthesis 30, the second ulnar prosthesis 32 is provided with a second fixing hole 323, and the ulnar prosthesis 30 further comprises a third fastening member 33 inserted into the second fixing groove 313 and the second fixing hole 323. The ulnar prosthesis 30 is provided with two sections of split structures (a first ulnar prosthesis 31 and a second ulnar prosthesis 32), and the first ulnar prosthesis 31 and the second ulnar prosthesis 32 are matched through threads, so that the length of the ulnar prosthesis 30 can be adjusted to meet the requirements of different patients. By inserting the third fastening member 33 into the second fixing hole 323 and the second fixing groove 313, it is possible to prevent the third threaded section 312 from rotating with respect to the second threaded hole 322 after completing the adjustment of the length of the ulnar prosthesis 30 to thereby change the length of the ulnar prosthesis 30, ensuring stability after the prosthesis is implanted.

It should be noted that in this embodiment, prior to implantation of the prosthesis, the height of the radial prosthesis 20 may be adjusted by rotating the second radial prosthesis 22, and the height of the ulnar prosthesis 30 may be adjusted by rotating the second ulnar prosthesis 32. The first fixing hole 223 and the second fixing hole 323 are both threaded holes, the second fastening member 23 and the third fastening member 33 are both screws, the head ends of the screws can be fixed on the second ulnar prosthesis 32 and the second ulnar prosthesis 33 through the threaded holes, and the other ends of the screws are inserted into the first fixing groove 212 and the second fixing groove 313, so that anti-rotation fixation after the height adjustment of the radius prosthesis 20 and the ulnar prosthesis 30 is realized.

In this embodiment, the radius prosthesis 20 is made of a metal material with a relatively small elastic modulus, such as titanium alloy, the articular surface prosthesis 10 is made of a wear-resistant metal material, such as cobalt-chromium-molybdenum alloy, and the ball head 311 is made of a wear-resistant material, such as ultra-high molecular weight polyethylene.

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

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

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

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