CN217593154U - Wrist joint prosthesis - Google Patents

Abstract

The utility model relates to a wrist joint prosthesis, which comprises a body and a fixing part connected with the body. The body comprises a butt joint surface and a profiling surface which are arranged oppositely, the butt joint surface is used for being in butt joint with the carpal bones, the profiling surface is used for being in running fit with the radius bones, the fixing part is connected with the body, fixing holes used for penetrating the connecting piece are formed in the fixing part, and the fixing part is used for being connected to the carpal bones through the connecting piece. Above-mentioned wrist joint prosthesis can avoid cutting the bone in a large number to the patient, is favorable to the patient bone to preserve to can remain patient wrist joint's activity degree better.

Description

Wrist joint prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a wrist joint prosthesis.

Background

The wrist joint, one of the most important joints of the human body, is easily damaged by traumatic, degenerative and rheumatoid arthritis, causing severe pain or restricted movement of the patient. With the medical progress, the total wrist replacement surgery has been increasingly applied to the treatment of wrist joint diseases, and the total wrist replacement prosthesis adopted by the method can eliminate pain and simultaneously retain the functions of partial volar flexion, dorsal extension, radial deviation and ulnar deviation of the wrist joint.

The wrist joint prosthesis generally comprises a wrist bone side prosthesis and a radius side prosthesis, wherein the wrist bone side prosthesis is provided with a spherical joint protrusion, the radius side prosthesis is provided with a spherical joint socket, and the joint protrusion is matched with the spherical surface of the joint socket to ensure the mobility of the wrist joint prosthesis. However, when such a wrist joint prosthesis is used in a replacement operation, operations such as stripping, osteotomy, and reaming of soft tissues around the wrist joint are required, which causes severe loss of the bone mass of the wrist bone and the radius, and also causes the risk of loosening of the wrist joint prosthesis and deep infection of the medullary cavity after long-term use. In addition, the matching of the ellipsoidal high joint protrusion and the spherical surface of the joint socket can ensure certain joint mobility, but the wrist joint mobility is severely limited.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a wrist prosthesis that avoids significant osteotomy of the patient, facilitates bone preservation of the patient, and better preserves mobility of the wrist of the patient.

In one aspect, the present application provides a wrist prosthesis comprising:

the body comprises a butting surface and a profiling surface, the butting surface is used for butting with a carpal bone, and the profiling surface is used for rotationally matching with a radius; and the number of the first and second groups,

the fixing piece is connected with the body, a fixing hole for penetrating the connecting piece is formed in the fixing piece, and the fixing piece is connected to the carpal bone through the connecting piece.

The technical solution of the present application is further described below:

in one of the embodiments, the abutment surface is provided with a first porous coating having a pore structure for carpal ingrowth.

In one embodiment, the abutment surface is provided with a groove, the groove walls of which are provided with the second porous coating having a pore structure for carpal ingrowth.

In one embodiment, the abutment surface is provided with a post, the surface of which is provided with the third porous coating having a porous structure for carpal ingrowth.

In one embodiment, the body and the fixing member are integrally formed by 3D printing.

In one embodiment, the contour surface has an arithmetic mean deviation of the contour less than or equal to 0.1 μm.

In one embodiment, the fixing part is arranged at the edge position where the abutting surface is connected with the profiling surface and extends back to the direction of the profiling surface.

In one embodiment, the number of the fixing pieces is at least two, and at least two fixing pieces are arranged at intervals.

In one embodiment, the number of the fixing pieces is two, wherein one fixing piece is used for fixing to the back side of the carpal bone and pointing to the second metacarpal bone, and the other fixing piece is used for fixing to the back side of the carpal bone and pointing to the fourth metacarpal bone.

In one embodiment, the number of the fixing pieces is two, wherein one fixing piece is used for fixing to the back side of the carpal bone and pointing to the first metacarpal bone, and the other fixing piece is used for fixing to the back side of the carpal bone and pointing to the fifth metacarpal bone.

Above-mentioned wrist joint prosthesis utilizes the profile face directly to carry out normal running fit with patient's radius articular surface, need not to carry out the prosthesis implantation to patient's radius articular surface, has avoided cutting the operation such as bone and reaming marrow to patient's radius, has reduced the operation degree of difficulty. Meanwhile, the bionic surface is in running fit with the radial joint surface, so that the native wrist joint of the patient is restored to the maximum extent, and the motion range of the wrist joint of the patient is effectively reserved. And can fix the wrist joint prosthesis on the carpal bone through the cooperation of mounting and connecting piece to in the operation, only need carry out simple rasp with the near-end articular surface of carpal bone and can implant, also need not to cut bone and expand operations such as marrow in a large number to the carpal bone, further reduced the operation degree of difficulty when furthest keeps the carpal bone volume.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a wrist prosthesis according to a first embodiment;

FIG. 2 is a top view of the wrist prosthesis shown in FIG. 1;

FIG. 3 is a cross-sectional view of the wrist prosthesis shown in FIG. 1;

FIG. 4 is a top plan view of a wrist prosthesis according to a second embodiment;

FIG. 5 is a top view of a wrist prosthesis according to a third embodiment;

FIG. 6 is a front view of the wrist prosthesis shown in FIG. 5;

FIG. 7 isbase:Sub>A cross-sectional view at section A-A of the wrist prosthesis shown in FIG. 6;

FIG. 8 is a top plan view of a wrist prosthesis according to a fourth embodiment;

FIG. 9 is an elevation view of a fifth embodiment wrist prosthesis;

FIG. 10 is a cross-sectional view of the wrist prosthesis shown in FIG. 9 in section B-B;

FIG. 11 is a top view of the wrist prosthesis shown in FIG. 9;

figure 12 is an elevation view of a sixth embodiment wrist prosthesis.

Description of reference numerals:

10. a body; 11. an abutting surface; 12. profiling surfaces; 13. a groove; 14. a column; 20. a fixing member; 21. and (7) fixing holes.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.

Referring to fig. 1 to 3, fig. 1 to 3 are schematic structural views illustrating a wrist joint prosthesis according to an embodiment of the present invention, which is provided to replace a proximal joint surface of a carpal bone of a patient. The wrist joint prosthesis of an embodiment includes a body 10 and a fixing member 20 coupled to the body 10. The body 10 includes an abutting surface 11 and a contoured surface 12, which are oppositely disposed, the abutting surface 11 is configured to abut against a carpal bone, the contoured surface 12 is configured to be rotationally matched with a radius bone, and preferably, the overall shape of the contoured surface 12 is the same as the shape of a native articular surface of the carpal bone. The shape of the native articular surface of the carpus refers to the articular surface of the carpus which is matched with the radius, namely the shape of the proximal articular surface of the carpus before the disease or injury. The fixing member 20 is connected to the body 10, the fixing member 20 is provided with a fixing hole 21 for passing a connecting member, and the fixing member 20 is connected to the carpal bone through the connecting member. Preferably, the fixture 20 is intended to be fixed to the dorsal aspect of the carpal bones and the extension of the fixture 20 is directed towards the metacarpal bones. Further, the connecting member may be a screw, and the fixing hole 21 may be a screw hole.

Further, during the operation, the proximal articular surface of the carpal bone is firstly rasped into a shape matched with the abutting surface 11 of the carpal joint prosthesis, and then the abutting surface 11 is abutted to the proximal end of the carpal bone after rasping. The fixing member 20 is then fixed to the back of the carpal bone by means of a screw or the like, thereby completing the implantation of the wrist prosthesis.

Above-mentioned wrist joint prosthesis carries out the profile modeling through the primary articular surface to the carpal and forms profile modeling face 12 to can perfectly replace the near-end articular surface of carpal, make the profile modeling face 12 and the radius articular surface phase-match of wrist joint prosthesis, and then can directly cooperate with patient's radius articular surface, need not to carry out the false body implantation to patient's radius articular surface, avoided cutting the operation such as bone and reaming to patient's radius, reduced the operation degree of difficulty. Meanwhile, the bionic surface 12 with the same shape as the native articular surface of the carpal bone is directly matched with the articular surface of the radius bone, the native wrist joint of the patient is restored to the maximum extent, and the motion degree of the wrist joint of the patient is effectively reserved. And can fix the wrist joint prosthesis on the carpal bone through the cooperation of mounting 20 and connecting piece to in the operation, only need carry out simple rasp with the near-end articular surface of carpal bone and can implant, also need not to cut bone and expand operations such as marrow in a large number to the carpal bone, further reduced the operation degree of difficulty when furthest keeps the carpal bone volume.

Further, the abutment surface 11 is provided with a first porous coating having a pore structure for carpal ingrowth. Specifically, the body 10 and the fixing member 20 of the wrist joint prosthesis may be integrally formed by 3D printing, and the first porous coating may also be covered on the abutting surface 11 of the body 10 by 3D printing, and a pore structure is directly formed in the first porous coating during the printing process. After the wrist joint prosthesis is implanted in an operation, the abutting surface 11 of the wrist joint abuts against the proximal end of the carpal bone, and the carpal bone can gradually grow into the gap structure of the first porous coating, so that the long-term fixation of the wrist joint prosthesis and the carpal bone is realized.

With continued reference to fig. 1 to 3, in one of the embodiments the abutment surface 11 is provided with a groove 13, the walls of the groove 13 being provided with a second porous coating. The second porous coating also has a pore structure for carpal ingrowth and preferably is contiguous with the first porous coating. Specifically, in the operation process, the proximal end of the carpal bone is ground and filed to form a convex shape matched with the groove 13, then the protrusion is pressed into the groove 13, so that the connection stability of the wrist joint prosthesis and the carpal bone is improved by matching the groove 13 with the protrusion, meanwhile, the contact area of the wrist joint prosthesis and the carpal bone is also increased by arranging the groove 13 on the abutting surface 11, and the groove wall of the groove 13 is provided with the second porous coating, so that the connection stability of the wrist joint prosthesis and the carpal bone can be further improved after the carpal bone grows into the gap structure of the second porous coating.

Referring to fig. 4, in another embodiment, the abutment surface 11 is provided with a pillar 14, the surface of the pillar 14 being provided with a third porous coating also having a porous structure for carpal ingrowth, preferably the third porous coating being contiguous with the second porous coating or the first porous coating. The upright column 14 is used for penetrating into a carpal bone, so that the connection stability of the wrist joint prosthesis and the carpal bone is improved, meanwhile, the contact area of the wrist joint prosthesis and the carpal bone is increased by arranging the upright column 14 on the abutting surface 11, and the third porous coating is arranged on the surface of the upright column 14, so that after the carpal bone grows into a gap structure of the third porous coating, the connection stability of the wrist joint prosthesis and the carpal bone can be further improved. Specifically, during the operation, a hole matching the post 14 is rasped at the proximal end of the carpal bone, and then the post 14 is passed into the hole and the abutment surface 11 is brought into abutment with the proximal end of the carpal bone. Further, when the abutment surface 11 of the wrist joint prosthesis is provided with both the groove 13 and the stud 14, see fig. 5 to 7, the stud 14 may be provided at the bottom of the groove 13.

Referring to fig. 8, it is worth explaining that the abutment surface 11 may also be of a planar structure. That is, the abutting surface 11 may not be provided with the groove 13, the pillar 14, or the like, and the long-term fixation of the wrist joint prosthesis to the carpal bone can be similarly achieved by the first porous coating on the abutting surface 11.

Further, the contoured face 12 has a highly polished surface. Preferably, in the present embodiment, the surface roughness, i.e., the profile arithmetic mean deviation Ra, of the contoured face 12 is less than or equal to 0.1 μm. By forming contoured surface 12 with a highly polished surface, the mobility of the wrist joint is advantageously increased.

Further, the fixing element 20 is disposed at the edge of the abutting surface 11 connected to the contoured surface 12 and extends away from the contoured surface, so that the fixing element 20 can be fixed outside the carpal bone, and the problem that the conventional insertion prosthesis is easy to loosen is avoided.

Further, the number of the fixing members 20 is at least two, and at least two fixing members 20 are arranged at intervals. For example, in this embodiment, the wrist joint prosthesis is provided with two fixing elements 20, and the two fixing elements 20 are respectively arranged at different positions of the edge of the abutting surface 11 connected with the profiling surface 12. The stability of the connection of the wrist prosthesis to the carpal bones is further improved by the simultaneous fixation of at least two fixation elements 20 to the carpal bones. Preferably, the length of the different fasteners 20 may be the same or different. Further, at least two fixing holes 21 are formed in each fixing member 20, so that the stability of the connection of the wrist prosthesis to the carpal bone is further improved by inserting a screw or the like into each fixing hole 21.

Further, referring to fig. 1 to 8, in some embodiments, the wrist prosthesis is provided with two fixtures 20, one fixture 20 of the two fixtures 20 for fixing to a dorsal side of the carpal bone and directed toward the second metacarpal bone, and the other fixture 20 of the two fixtures 20 for fixing to a dorsal side of the carpal bone and directed toward the fourth metacarpal bone. The operation is facilitated by one of the fixing members 20 pointing to the second metacarpal bone and the other fixing member 20 pointing to the fourth metacarpal bone, and the operation efficiency is improved.

Referring to fig. 8 to 12, fig. 8 to 12 show further embodiments of wrist prostheses which differ from those shown in fig. 1 to 8 in the location of the fixing member 20 of the wrist prostheses shown in fig. 8 to 12. In particular, one of the fixtures 20 of the wrist prosthesis shown in fig. 8 to 12 is intended to be fixed to the dorsal side of the carpal bone and directed towards the first metacarpal bone, and the other fixture 20 is intended to be fixed to the dorsal side of the carpal bone and directed towards the fifth metacarpal bone. Specifically, one of the fixing members 20 points to the first metacarpal bone from the inner side of the wrist joint through the scaphoid bone and the trapezium bone, and the other fixing member 20 points to the fifth metacarpal bone from the outer side of the wrist joint through the lunar bone, the triangular bone and the sulcus bone, because the soft tissues and the fat covering layers on the inner side and the outer side of the wrist joint are thicker, the fixing members 20 can be prevented from protruding outwards after being sutured by respectively arranging the two fixing members 20 on the inner side and the outer side of the wrist joint, and the palm of a patient can be ensured to be beautiful after operation.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A wrist prosthesis, comprising:

the wrist brace comprises a body, a connecting piece and a connecting piece, wherein the body comprises a butting surface and a profiling surface, the butting surface is used for butting with a carpal bone, and the profiling surface is used for rotationally matching with a radius bone; and the number of the first and second groups,

the fixing piece is connected with the body, a fixing hole for penetrating the connecting piece is formed in the fixing piece, and the fixing piece is connected to the carpal bone through the connecting piece.

2. The wrist joint prosthesis according to claim 1, wherein the abutment surface is provided with a first porous coating having a pore structure for carpal ingrowth.

3. The wrist joint prosthesis according to claim 1, wherein the abutment surface is provided with a groove, a groove wall of which is provided with a second porous coating having a pore structure for carpal ingrowth.

4. Wrist joint prosthesis according to any one of claims 1-3, characterized in that the abutment surface is provided with a post, the surface of which is provided with a third porous coating having a pore structure for carpal ingrowth.

5. The wrist joint prosthesis of claim 1, wherein the body and the fixture are integrally formed by 3D printing.

6. The wrist joint prosthesis according to claim 1, wherein the contour surface has an arithmetic mean deviation of the contour of less than or equal to 0.1 μm.

7. The wrist joint prosthesis of claim 1, wherein the fixing member is disposed at an edge of the abutting surface connected to the contoured surface and extends away from the contoured surface.

8. The wrist joint prosthesis according to claim 1 or 7, wherein the number of the fixing members is at least two, and the at least two fixing members are provided at intervals.

9. The wrist joint prosthesis according to claim 1 or 7, wherein the number of the fixing members is two, one of the fixing members is for fixing to a dorsal side of the carpal bone and directed to a second metacarpal bone, and the other of the fixing members is for fixing to a dorsal side of the carpal bone and directed to a fourth metacarpal bone.

10. The wrist joint prosthesis according to claim 1 or 7, wherein the number of fixtures is two, one of the fixtures being for fixing to the dorsal side of the carpal bone and directed towards a first metacarpal bone, and the other of the fixtures being for fixing to the dorsal side of the carpal bone and directed towards a fifth metacarpal bone.

Images