Radius, navicular bone and meniscus fusion prosthesis after distal radius resection

Abstract

The utility model discloses a distal radius resection radius, navicular bone and meniscus fusion prosthesis which comprises a distal radius entity, and a bone growth interface is arranged at the distal end of the distal radius entity. The bone growth interface is provided with a navicular bone connecting screw used for being connected with a navicular bone and a lunar bone connecting screw used for being connected with a lunar bone, the tail end of the distal radius entity is connected with a biological handle connecting part, and a biological handle is arranged at the end of the biological handle connecting part. By arranging the bone growth interface, the navicular bone connecting screw and the lunar bone connecting screw, fusion of the distal radius entity, the lunar bone and the navicular bone can be achieved, the middle wrist joint and the carpometacarpal joint are reserved, a certain wrist joint motion range is reserved for a patient, and complete loss of the motion range caused by full wrist joint fusion is avoided. A painless, stable and powerful wrist joint can be reconstructed, and the defects that an existing semi-joint prosthesis is prone to dislocation and full-joint replacement is prone to loosening are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of medical artificial prostheses, in particular to a prosthesis of the radius, scaphoid bone and lunate bone fusion after the distal end of the radius is removed. Background Art

[0002] The distal radius involves the radiocarpal joint and the distal radioulnar joint. The radiocarpal joint consists of the distal radius, distal ulna, scaphoid, lunate, triquetrum, pisiform bone, and multiple ligaments. The radiocarpal joint has a complex shape and a variety of movements, including wrist flexion, dorsiflexion, radial deviation, ulnar deviation, pronation, supination, and other movements. The distal radius is also a common site for malignant tumors. After tumor resection, large bone defects are left behind, which brings great difficulties to reconstruction. A painless, stable, strong, and flexible wrist joint has always been the goal of tumor reconstruction, but it is often impossible to meet them all at the same time.

[0003] In the past, there were many reconstruction methods, including autologous fibula transplantation, wrist arthroplasty, autologous iliac bone transplantation, wrist fusion, allogeneic bone transplantation, wrist arthroplasty, hemicarpal prosthesis replacement, and total wrist replacement, all of which have obvious disadvantages. For example, autologous fibula transplantation requires the proximal end of one side of the patient's fibula to be removed, causing damage to the donor site that affects the appearance and gait, and there is a risk of common peroneal nerve damage. Once the common peroneal nerve is damaged, it is often difficult to recover, resulting in lifelong disability; hemicarpal replacement is reconstructed with a distal radial prosthesis and wrist arthroplasty. Due to the obvious ulnar deviation angle of the distal radius, the joint surface tilts to the ulnar side, making the carpal bone naturally tend to dislocate to the ulnar side. Especially in tumor patients, the surrounding ligaments are often completely removed, resulting in poor stability of the prosthesis. Even with patch repair, many patients still have ulnar dislocation of the carpal bone, which seriously affects the appearance and function; and although total wrist replacement avoids the disadvantage of easy dislocation of hemicarpal replacement, due to the complex movement of the wrist joint and the distal radioulnar joint, the stress is large, causing the prosthesis to loosen easily, which also limits the application of this procedure. Therefore, a radial prosthesis that can retain the midcarpal joint and the carpometacarpal joint is needed to solve the problems in the prior art. Utility Model Content

[0004] The utility model provides a fusion prosthesis of the radius, scaphoid and lunate after distal radius resection, which can reconstruct a painless, stable and powerful wrist joint and overcome the shortcomings of the existing half-joint prosthesis being easy to dislocate and the whole joint replacement being easy to loosen.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a radius, scaphoid and lunate fusion prosthesis after distal radius resection, comprising a distal radius entity, a bone growth interface is provided at the distal end of the distal radius entity, a scaphoid connecting screw for connecting to the scaphoid and a lunate connecting screw for connecting to the lunate are provided on the bone growth interface, a biological stem connecting part is connected to the tail end of the distal radius entity, a biological stem is provided at the end of the biological stem connecting part, and the fusion of the distal radius entity with the lunate and scaphoid bones can be achieved by providing the bone growth interface and the scaphoid connecting screw and the lunate connecting screw, thereby retaining the mid-carpal joint and the carpometacarpal joint, allowing the patient to retain a certain range of motion of the wrist joint and avoiding complete loss of range of motion caused by total wrist fusion.

[0006] Preferably, there are at least two scaphoid connecting screws and two lunate connecting screws arranged side by side, which can ensure the fusion strength between the scaphoid connecting screw and the scaphoid bone and the fusion strength between the lunate connecting screw and the lunate A.

[0007] Preferably, at least one ligament suture hole is provided near the distal end of the distal radius entity, which is conducive to reconstruction of the distal radioulnar joint and retaining the rotation function of the forearm.

[0008] Preferably, the shape of the distal end of the radius is proportionally reduced by 10% relative to the radius resection segment, thereby reducing soft tissue tension and wound complications.

[0009] Preferably, the length of the radial styloid prosthesis portion at the distal end of the radial distal entity close to the scaphoid connecting screw is shorter than the length of the radial styloid of the radial resection segment, thereby reducing soft tissue tension and wound complications.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] By setting up a bone growth interface and scaphoid and lunate connecting screws, fusion of the distal radius with the lunate and scaphoid bones can be achieved, preserving the midcarpal joint and carpometacarpal joint, allowing the patient to retain a certain range of motion in the wrist joint, avoiding complete loss of motion caused by total wrist fusion, and overcoming the shortcomings of existing half-joint prostheses that are easy to dislocate and total joint replacements that are easy to loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the main structural diagram of the utility model;

[0013] Figure 2 It is an enlarged structural diagram of the distal end of the radius of the utility model;

[0014] Figure 3 It is a schematic diagram of the fusion of the distal end of the radius with the lunate and the scaphoid according to the present invention.

[0015] Reference numerals:

[0016] 1. Distal radial entity, 2. Biological stem connection part, 3. Bone growth interface, 4. Scaphoid connection screw, 5. Lunate connection screw, 6. Biological stem, 7. Ligament suture hole, 8. Radial styloid prosthesis part, A. Lunate, B. Scaphoid. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] The utility model overcomes the shortcomings of the existing half-joint prosthesis that is easy to dislocate and the whole joint replacement that is easy to loosen. Figure 1-3 As shown, the following technical solution is provided: a radius, scaphoid and lunate fusion prosthesis after distal radius resection, comprising a distal radius entity 1, a bone growth interface 3 is provided at the distal end of the distal radius entity 1, a scaphoid connecting screw 4 for connecting to the scaphoid B and a lunate connecting screw 5 for connecting to the lunate A are provided on the bone growth interface 3, a biological stem connecting part 2 is connected to the tail end of the distal radius entity 1, a biological stem 6 is provided at the end of the biological stem connecting part 2, and the fusion of the distal radius entity 1 with the lunate A and the scaphoid B can be achieved by setting the bone growth interface 3 and the scaphoid connecting screw 4 and the lunate connecting screw 5, the mid-carpal joint and the carpometacarpal joint are retained, so that the patient retains a certain range of motion of the wrist joint and avoids the complete loss of mobility caused by total wrist fusion.

[0019] Specifically, the prosthesis is industrially manufactured, has accessibility and repeatability, and is not limited by the source of autologous or allogeneic bones. A plurality of oblique threaded holes are provided on the bone growth interface 3, and the lunate connecting screw 5 and the scaphoid connecting screw 4 can pass through the threaded holes, so that the lunate connecting screw 5 and the scaphoid connecting screw 4 can be connected to the lunate A and the scaphoid B at a suitable angle to improve the fusion effect. An interference fit can be adopted between the distal end entity 1 of the radius and the biological stem connection part 2 to ensure the firmness of the combination of the two. The diameter and shape of the biological stem 6 are designed according to the CT data, and match the proximal medullary cavity of the radius to form a press fit.

[0020] In this embodiment, in order to improve the fusion strength, Figure 1-2 As shown, the scaphoid connecting screw 4 and the lunate connecting screw 5 are at least two arranged side by side, which can ensure the fusion strength between the scaphoid connecting screw 4 and the scaphoid bone B and the fusion strength between the lunate connecting screw 5 and the lunate bone A.

[0021] At the same time, if Figure 1As shown, the distal radius entity 1 is provided with at least one ligament suture hole 7 near the distal end, which is beneficial to the reconstruction of the distal radioulnar joint and retaining the rotation function of the forearm. Two ligament suture holes 7 can be arranged side by side and pass through the distal radius entity 1.

[0022] In this embodiment, the distal end of the radius entity 1 is not designed in a completely bionic way. Specifically, the shape of the distal end of the radius entity 1 is proportionally reduced by 10% relative to the radius resection segment, reducing soft tissue tension and wound complications. At the same time, the length of the radial styloid prosthesis 8 at the distal end of the distal end of the radius entity 1 near the scaphoid connecting screw 4 is less than the length of the radial styloid of the radius resection segment, which can also reduce soft tissue tension and reduce wound complications.

[0023] The technical solution in this embodiment retains the mid-carpal joint and the carpometacarpal joint, allowing the patient to retain a certain range of motion in the wrist joint, avoiding complete loss of motion caused by total wrist fusion, and overcoming the shortcomings of existing half-joint prostheses that are easy to dislocate and total joint replacements that are easy to loosen.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, in the present invention, the descriptions of "primary", "secondary", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "primary" or "secondary" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A fusion prosthesis of the radius, scaphoid and lunate after distal radius resection, characterized in that: include: A distal radius entity (1), wherein the distal end of the distal radius entity (1) is provided with a bone growth interface (3), and the bone growth interface (3) is provided with a scaphoid bone connecting screw (4) for connecting to the scaphoid bone (B) and a lunate bone connecting screw (5) for connecting to the lunate bone (A), and the tail end of the distal radius entity (1) is connected to a biological stem connecting portion (2), and the end of the biological stem connecting portion (2) is provided with a biological stem (6).

2. The radius, scaphoid and lunate fusion prosthesis after distal radius resection according to claim 1, characterized in that: The scaphoid connecting screw (4) and the lunate connecting screw (5) are at least two and are arranged side by side.

3. The radius, scaphoid and lunate fusion prosthesis after distal radius resection according to claim 1, characterized in that: The radial distal end entity (1) is provided with at least one ligament suture hole (7) at a position close to the distal end.

4. The radius, scaphoid and lunate fusion prosthesis after distal radius resection according to claim 1, characterized in that: The shape of the distal end entity of the radius (1) is proportionally reduced by 10% relative to the resected segment of the radius.

5. The radius, scaphoid and lunate fusion prosthesis after distal radius resection according to claim 4, characterized in that: The length of the radial styloid prosthesis part (8) at the distal end of the radial distal entity (1) close to the scaphoid connecting screw (4) is smaller than the length of the radial styloid of the radius resection segment.

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