A wrist joint bone defect repair system

Abstract

The present application discloses a wrist joint bone defect repair system, including a distal radius prosthesis and a radial articular surface prosthesis; the first end of the body of the distal radius prosthesis is provided with a plate-shaped radial osteosynthesis portion extending along its long axis direction, the radial osteosynthesis portion is provided with a plurality of radial connection holes, the end of the second end of the body of the distal radius prosthesis is provided with a first limiting groove; the first end of the radial articular surface prosthesis is provided with a protruding first limiting block, the first limiting block is installed in the first limiting groove; the second end face of the radial articular surface prosthesis is a radial articular surface. The radial articular surface of the present application and the metacarpal bone together form a wrist joint portion corresponding to the radius, and its geometric shape is the same as the geometric shape of the articular surface of the anatomical wrist joint, which can restore the function and range of motion of the wrist joint.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and more specifically, to a wrist joint bone defect repair system. Background Art

[0002] The wrist joint, also known as the radiocarpal joint, is a typical elliptical joint. The wrist joint is composed of the proximal articular surfaces of the scaphoid, lunate and triquetrum bones of the hand as the articular head, and the carpal articular surface of the radius and the articular disc below the ulna as the articular fossa. The radius and ulna are the two bones of the forearm. The radius is located on the outside of the forearm, that is, on the side of the thumb. The ulna is located on the inside of the forearm, that is, on the side of the little finger.

[0003] Bone defects in the wrist joint caused by infection, trauma, arthritis, rheumatism or tumors seriously affect the patient's ability to work and quality of life. The wrist prosthesis currently on the market is a conventional prosthesis, which is generally a ball-and-socket structure. This prosthesis relies solely on the ball-and-socket structure to maintain stability, and requires the metacarpal prosthesis to be fused with the metacarpal bone, which cannot fully restore the function and range of motion of the wrist joint.

[0004] In addition, ball-and-socket wrist prostheses are not suitable for large bone defects of the radius and ulna. Summary of the invention

[0005] The present application provides a wrist joint bone defect repair system, wherein the radial articular surface and the metacarpal bone together form a wrist joint portion corresponding to the radius, and its geometric shape is the same as the geometric shape of the articular surface of the anatomical wrist joint, and can restore the function and range of motion of the wrist joint.

[0006] The present application provides a bone defect repair system for a wrist joint, comprising a distal radius prosthesis and a radial articular surface prosthesis; the first end of the body of the distal radius prosthesis is provided with a plate-shaped radial osteosynthesis portion extending along its long axis direction, the radial osteosynthesis portion is provided with a plurality of radial connection holes, the end of the second end of the body of the distal radius prosthesis is provided with a first limiting groove; the first end of the radial articular surface prosthesis is provided with a protruding first limiting block, the first limiting block is installed in the first limiting groove; the second end surface of the radial articular surface prosthesis is the radial articular surface.

[0007] Preferably, the end of the second end of the distal radius prosthesis is further provided with at least one group of first suture holes.

[0008] Preferably, a radial micro-hole is provided at the end of the first end of the body of the distal radius prosthesis.

[0009] Preferably, the suture portion where the first suture hole is located is provided with a radial microhole.

[0010] Preferably, a first limiting hole is provided on the second end surface of the body of the distal radius prosthesis, and a protruding second limiting block is also provided on the first end of the radial articular surface prosthesis, and the second limiting block is installed in the first limiting hole.

[0011] Preferably, a reinforcing rib is provided at the end of the first end of the body of the distal radius prosthesis.

[0012] Preferably, the bone defect repair system also includes a distal ulnar prosthesis and an ulnar articular surface prosthesis; the first end of the body of the distal ulnar prosthesis is provided with a plate-shaped ulnar osteosynthesis portion extending along its long axis, the ulnar osteosynthesis portion is provided with a plurality of ulnar connection holes, and a second limiting hole is provided on the end face of the second end of the body of the distal ulnar prosthesis; the first end of the ulnar articular surface prosthesis is provided with a protruding third limiting block, and the third limiting block is installed in the second limiting hole; the second end face of the ulnar articular surface prosthesis is the ulnar articular surface.

[0013] Preferably, a fourth limiting block is provided on the side surface of the second end of the body of the distal ulna prosthesis; a second limiting groove is provided on the side surface of the radial articular surface prosthesis, and the fourth limiting block is installed in the second limiting groove.

[0014] Preferably, at least one group of second suture holes is further provided at the end of the second end of the body of the distal ulna prosthesis.

[0015] Preferably, an ulnar microhole is provided at the end of the first end of the body of the distal ulna prosthesis and / or at the suture portion where the second suture hole is located.

[0016] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0018] Figure 1 A schematic diagram of the structure of the wrist bone defect repair system provided in this application;

[0019] Figure 2 A stereoscopic view of the distal radius prosthesis provided for this application;

[0020] Figure 3 A stereoscopic view of the radial articular surface prosthesis provided for this application;

[0021] Figure 4 A stereoscopic view of the distal ulna prosthesis provided for this application; Figure 5 A stereoscopic view of the ulnar articular surface prosthesis provided for this application.

[0022] The following are marked in the figure:

[0023] 10-distal radial prosthesis 11-radial osteosynthesis 12-radial connection hole

[0024] 13- reinforcing rib 14- first limiting groove 15- first limiting hole

[0025] 16- radial bone marrow needle 17- radial microhole 18- first suture hole

[0026] 20- radial articular surface prosthesis 21- first limiting block 22- second limiting groove

[0027] 23- radial articular surface 24- second limit block 30- distal ulna prosthesis

[0028] 31-ulnar microhole 32-reinforcement rib 33-second limiting hole

[0029] 34- fourth limit block 35- ulna bone connection part 36- ulna connection hole

[0030] 37-ulnar bone marrow needle 38-second suture hole 40-ulnar joint surface prosthesis

[0031] 41- third limit block 42- ulnar joint surface DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] The present application provides a wrist joint bone defect repair system, which can restore the natural anatomical morphology and range of motion of the wrist joint through the radial articular surface and ulnar articular surface that are the same as the articular surface of the human wrist joint, and preserve the radioulnar joint. The geometric structure of the bone defect repair system is consistent with the bone defect area of ​​the wrist joint and the anatomical geometric morphology of the healthy side wrist joint, and can achieve the filling of large segment bone defects of the radius and ulna of the wrist joint, and can restore the anatomical structure of the affected part and restore its length.

[0037] like Figure 1As shown, the bone defect repair system for the wrist joint includes a radial component and / or an ulnar component. The patient can implant the radial component or the ulnar component alone or implant the radial component and the ulnar component at the same time according to needs.

[0038] like Figure 1 As shown, the radial component includes a distal radial prosthesis 10 and a radial articular surface prosthesis 20. Figure 1 and 2 As shown, the body of the distal radius prosthesis 10 is columnar, and its circumferential dimension gradually decreases from one end (referred to as the second end) close to the articular surface of the wrist joint to one end (referred to as the first end) away from the articular surface of the wrist joint, and is roughly conical. A plate-shaped radial bone-jointing part 11 extending along its long axis direction (i.e., the long axis direction of the radius of the human body) is provided on the outer surface of the first end of the body, and a plurality of radial connection holes 12 are provided on the radial bone-jointing part 11. The cortical bone screw passes through the radial connection hole 12 to fix the radial bone-jointing part 11 to the radius of the human body. A first limiting groove 14 is provided at the end of the second end of the body of the distal radius prosthesis 10. The first limiting groove 14 has a first notch located on the end surface of the second end of the body of the distal radius prosthesis 10 and a second notch located on the conical side surface of the body of the distal radius prosthesis 10. A first limiting hole 15 is provided on the second end surface of the body of the distal radius prosthesis 10.

[0039] Preferably, the end of the second end of the distal radius prosthesis 10 is further provided with at least one group of first suture holes 18, and the area around the first suture holes 18 forms a suture portion. As an embodiment, each group of suture holes includes two pairs of suture holes (i.e., a total of four suture holes) arranged opposite to each other on the conical side of the distal radius prosthesis 10, which are used for the suture thread to pass through the body and then return from the body. The first suture holes are used to suture the ligaments or tendons of the wrist joint, which is conducive to maintaining the mobility of the distal radius prosthesis and the stability of the connection between the distal radius prosthesis and the wrist joint.

[0040] Preferably, the end of the first end of the body of the distal radius prosthesis 10 is provided with a radius micropore 17. The end of the first end of the body of the distal radius prosthesis 10 is in contact with the residual end of the radius, and the structure of the radius micropore is a cancellous bone-like structure, which is in contact with the bone tissue of the residual end, providing a good microenvironment for the creeping and ingrowth of the bone tissue, so the radius micropore is conducive to the creeping and ingrowth of the bone tissue of the residual end of the radius.

[0041] As an embodiment, the average pore size of the radius micropores 17 is 500-700 μm, and the porosity is 60-80%.

[0042] Preferably, each suture portion is also provided with the same radial microhole 17 to facilitate the creeping and ingrowth of scar tissue around the ligament or tendon.

[0043] Preferably, a reinforcing rib 13 is provided at the end of the first end of the body of the distal radius prosthesis 10 to improve the strength of the distal radius prosthesis and provide strong support for the radial stump.

[0044] Preferably, if Figure 2 As shown, the body of the distal radius prosthesis 10 is provided with a radial medullary needle 16 extending in a direction away from the articular surface of the wrist joint. The radial medullary needle 16 is inserted into the medullary cavity of the radial stump in the human body, which is beneficial to further establish the positioning and connection stability between the distal radius prosthesis and the radius.

[0045] like Figure 3 As shown, the first end of the radial articular surface prosthesis 20 (the end facing the distal radial prosthesis 10) is provided with a protruding first limiting block 21, and the first limiting block 21 is installed in the first limiting groove 14, so that the radial relative movement of the distal radial prosthesis 10 and the radial articular surface prosthesis 20 is subject to certain restrictions. The first end of the radial articular surface prosthesis 20 is also provided with a protruding second limiting block 24, and the second limiting block 24 is installed in the first limiting hole 15. The second limiting block 24 is connected and matched with the first limiting groove 14 and the first limiting block 21, so as to realize the radial positioning of the distal radial prosthesis 10 and the radial articular surface prosthesis 20. The second end face of the radial articular surface prosthesis 20 is the radial articular surface 23, and the geometric structure (such as the concave and convex parts) of the radial articular surface 23 is the same as the anatomical morphology of the wrist joint of the human body. A second limiting groove is provided on the side of the radial articular surface prosthesis 10, and the second limiting groove faces the distal ulna prosthesis 30.

[0046] Preferably, if Figure 2 and 3 As shown, the second limiting block 24 is in a frustum shape, and the first limiting hole 15 is a conical hole. The cooperation between the two makes the mutual positioning of the distal radius prosthesis 10 and the radial articular surface prosthesis 20 more accurate.

[0047] Combination Figure 1 and 4 As shown, the body of the distal ulna prosthesis 30 is columnar, and its circumferential dimension gradually decreases from one end (denoted as the second end) close to the articular surface of the wrist joint to one end (denoted as the first end) away from the articular surface of the wrist joint, and is roughly conical. A plate-shaped ulnar bone-jointing portion 35 extending along its long axis direction (i.e., the length direction of the radius of the human body) is provided on the outer surface of the first end of the body, and a plurality of ulnar connecting holes 36 are provided on the ulnar bone-jointing portion 35, and cortical bone screws pass through the ulnar connecting holes 36 to fix the ulnar bone-jointing portion 35 to the ulna of the human body. A second limiting hole 33 is provided on the end surface of the second end of the body of the distal ulna prosthesis 30. A fourth limiting block 34 is provided on the end surface of the second end of the distal ulna prosthesis 30, and the fourth limiting block 34 is installed in the second limiting groove, so that the distal ulna prosthesis 30 and the radial articular surface prosthesis 20 are positioned and connected in the axial direction to form a radioulnar joint.

[0048] Preferably, the second limiting groove is arranged on the side of the first limiting block 21 (please refer to Figure 3 The first stopper 21 is used to position the distal radius prosthesis 10 and the radial articular surface prosthesis 20 relative to each other, and at the same time, the radial component and the ulna component are positioned, so that the overall structure of the bone defect repair system is more stable, and the ulna-radial joint is achieved.

[0049] Preferably, the second limiting groove 22 is a dovetail groove, and the fourth limiting block 34 includes a column section close to the body of the distal ulnar prosthesis 30 and a spherical top away from the body of the distal ulnar prosthesis 30, and the spherical top covers the column section, such as Figure 4 The spherical top is conducive to preventing the fourth limit block from falling out after entering the dovetail groove, thereby effectively preventing the radioulnar joint from dislocating.

[0050] Preferably, if Figure 4 As shown, the end of the second end of the distal ulnar prosthesis 30 is further provided with at least one group of second suture holes 38, and the area around the second suture holes 38 forms a suture portion. The second suture holes are used to suture the ligaments or tendons of the wrist joint, which is beneficial to maintaining the mobility of the distal ulnar prosthesis and the connection stability between the distal ulnar prosthesis and the wrist joint.

[0051] Preferably, the end of the first end of the body of the distal ulna prosthesis 30 is provided with an ulna micropore 31. The end of the first end of the body of the distal ulna prosthesis 30 is in contact with the stump of the ulna, and the structure of the ulna micropore is a cancellous bone-like structure, which is in contact with the bone tissue of the stump, providing a good microenvironment for the creeping and ingrowth of the bone tissue, so the ulna micropore is conducive to the creeping and ingrowth of the bone tissue of the stump of the ulna.

[0052] Preferably, each suture portion is also provided with the same ulnar microhole 31 to facilitate the creeping and ingrowth of scar tissue around the ligament or tendon, thereby providing a good foundation for the stable combination of the ligament or tendon and the ulnar component.

[0053] As an embodiment, the pore size of the ulna micropores 31 is 500-700 μm on average, and the porosity is 60-80%.

[0054] Preferably, a reinforcing rib 32 is provided at the end of the first end of the body of the distal ulna prosthesis 30 to improve the strength of the distal ulna prosthesis and provide strong support for the ulna stump.

[0055] Preferably, if Figure 4 As shown, the body of the distal ulna prosthesis 30 is provided with an ulnar bone marrow needle 37 extending in a direction away from the articular surface of the wrist joint. The ulnar bone marrow needle 37 is inserted into the medullary cavity of the ulna stump in the human body, which is beneficial to further establish the positioning and connection stability between the distal ulna prosthesis and the ulna.

[0056] like Figure 5As shown, the first end of the ulnar articular surface prosthesis 40 (the end facing the distal ulnar prosthesis 30) is provided with a protruding third stopper 41, and the third stopper 41 is installed in the second stopper hole 33, so that the radial relative movement of the distal ulnar prosthesis 30 and the ulnar articular surface prosthesis 40 is limited to a certain extent. The second end surface of the ulnar articular surface prosthesis 40 is the ulnar articular surface 42, and the geometric structure (e.g., concave and convex parts) of the ulnar articular surface 42 is the same as the anatomical morphology of the human wrist joint. As an embodiment, combined with Figure 1 and 5 A protrusion is provided on the side of the ulna articular surface 42 away from the distal radius prosthesis 10 to replace the position of the ulna styloid process.

[0057] Preferably, if Figure 4 and 5 As shown, the third limiting block 41 is in the shape of a frustum, and the second limiting hole 33 is a conical hole, and the cooperation between the two makes the mutual positioning of the ulna distal prosthesis 30 and the ulna articular surface prosthesis 40 more accurate.

[0058] Preferably, the radial articular surface prosthesis 20 and / or the ulnar articular surface prosthesis 40 are made of polyethylene material, which is a wear-resistant material and is also beneficial for protecting the metacarpal articular surface and bone tissue.

[0059] The radial articular surface prosthesis and the distal radial prosthesis in the radial component are matched by a cone and a stopper to form a radial articular prosthesis; the ulnar articular surface prosthesis and the distal ulnar prosthesis in the ulna component are matched by a cone to form an ulna articular prosthesis. The radial articular surface 23, the ulnar articular surface 42 and the metacarpal bone together form a wrist joint, and its geometric shape is the same as the geometric shape of the articular surface of the anatomical wrist joint.

[0060] In actual operation, the wrist bone defect repair system is customized according to the patient's imaging data to match its natural anatomical morphology, which is conducive to restoring its physiological function.

[0061] The beneficial effects of this application are as follows:

[0062] 1. In the present application, the articular surface of the radius and the metacarpal bone together form a wrist joint portion corresponding to the radius, and its geometric shape is the same as the articular surface geometry of the anatomical wrist joint, which can restore the function and range of motion of the wrist joint.

[0063] 2. In the present application, the articular surface of the ulna and the metacarpal bone together form a wrist joint portion corresponding to the ulna, and its geometric shape is the same as the articular surface geometry of the anatomical wrist joint, which can restore the function and range of motion of the wrist joint.

[0064] 3. In the present application, the geometric shapes of the radial component and the ulnar component are customized based on the anatomical geometric dimensions of the wrist bone defect area and the healthy wrist joint, which can fill the large bone defects of the radius and ulna, restore the anatomical structure of the diseased part, and restore its length.

[0065] 4. The present application retains the radioulnar joint through the positioning connection between the radial articular surface prosthesis and the distal ulna prosthesis, which is beneficial to the recovery of wrist joint function.

[0066] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A wrist joint bone defect repair system, characterized in that: Includes distal radial prosthesis and radial articular surface prosthesis; The first end of the body of the distal radius prosthesis is provided with a plate-shaped radius bone-jointing portion extending along the long axis direction thereof, the radius bone-jointing portion is provided with a plurality of radius connecting holes, and the end of the second end of the body of the distal radius prosthesis is provided with a first limiting groove; The first end of the radial articular surface prosthesis is provided with a protruding first limiting block, and the first limiting block is installed in the first limiting groove; the second end surface of the radial articular surface prosthesis is the radial articular surface; The end of the second end of the distal radius prosthesis is also provided with at least one group of first suture holes, the second end surface of the body of the distal radius prosthesis is provided with a first limiting hole, the first end of the radial articular surface prosthesis is also provided with a protruding second limiting block, and the second limiting block is installed in the first limiting hole; The bone defect repair system also includes an ulna distal prosthesis and an ulna articular surface prosthesis; The first end of the body of the distal ulna prosthesis is provided with a plate-shaped ulna bone-joining portion extending along the long axis direction thereof, the ulna bone-joining portion is provided with a plurality of ulna connection holes, and the end surface of the second end of the body of the distal ulna prosthesis is provided with a second limiting hole; The first end of the ulnar joint surface prosthesis is provided with a protruding third limiting block, and the third limiting block is installed in the second limiting hole; the second end surface of the ulnar joint surface prosthesis is the ulnar joint surface.

2. The wrist joint bone defect repair system according to claim 1, characterized in that: The end of the first end of the body of the distal radius prosthesis is provided with a radius microhole.

3. The wrist joint bone defect repair system according to claim 1 or 2, characterized in that: The suture portion where the first suture hole is located is provided with a radial microhole.

4. The wrist joint bone defect repair system according to claim 1, characterized in that: A reinforcing rib is provided at the end of the first end of the body of the distal radius prosthesis.

5. The wrist joint bone defect repair system according to claim 1, characterized in that: A fourth limiting block is provided on the side surface of the second end of the body of the distal ulna prosthesis; A second limiting groove is provided on the side surface of the radial articular surface prosthesis, and the fourth limiting block is installed in the second limiting groove.

6. The wrist joint bone defect repair system according to claim 1, characterized in that: The end of the second end of the body of the distal ulna prosthesis is also provided with at least one group of second suture holes.

7. The wrist joint bone defect repair system according to claim 6, characterized in that: An ulna microhole is provided at the end of the first end of the body of the distal ulna prosthesis and / or at the suture portion where the second suture hole is located.

Images