An artificial scaphoid bone with a screw-in ball-and-socket joint

Abstract

The present invention provides an artificial scaphoid bone with a screw-in ball-and-socket joint, which is an implant used to reconstruct the original scaphoid bone function and retain the space and range of motion of the radiocarpal joint. The scaphoid bone body and the support body are two parts. The scaphoid bone body is an irregular shape composed of a head, a body, and a tail, similar to the human scaphoid bone. The support body is composed of a ball head, a neck collar, and a handle. A spherical socket is provided at the body of the scaphoid bone and the ball head of the support body, forming a ball-and-socket joint with the ball head. The handle is a screw-in handle, which is a long conical screw-type structure with an external thread and a rough coating. The above structure is implanted into the radial wrist joint by using an implantation instrument to implant the artificial scaphoid bone with a screw-in ball-and-socket joint, which can be used to achieve the reconstruction of the radiocarpal joint. The structural characteristics of the device of the invention can disperse stress, maintain the space of the radiocarpal joint, retain a good range of motion of the radiocarpal joint, and reconstruct the radiocarpal joint well.

Description

Technical Field

[0001] The invention belongs to the technical field of repairing and reconstructing a radiocarpal joint by utilizing an implant, in particular to an artificial scaphoid bone of a screw-in ball-and-socket joint. Background Art

[0002] Scaphoid necrosis, nonunion, and delayed union caused by trauma, strain, or other factors are clinically challenging problems, resulting in symptoms such as pain and decreased wrist range of motion. Current treatments, which often involve scaphoid resection, tendon packing, and bone graft fusion, are limited in effectiveness and can lead to degeneration of adjacent carpal bones, decreased range of motion, and narrowing of the radiocarpal joint space. Currently, there is a lack of implants and surgical procedures suitable for restoring the original scaphoid function while preserving the radiocarpal joint space and range of motion. Summary of the Invention

[0003] The purpose of the present invention is to provide a screw-in ball-and-socket joint artificial scaphoid bone for use in surgeries such as scaphoid necrosis that require scaphoid bone replacement. It can reduce the radial side pressure of the wrist joint, relieve pain symptoms, and retain the extension, flexion, rotation and other range of motion of the radiocarpal joint, thereby improving the surgical effect and facilitating clinical application.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A screw-in ball-and-socket joint artificial scaphoid bone is an implant used to reconstruct the original scaphoid bone function and retain the radiocarpal joint space and range of motion, comprising a scaphoid body and a support body. The scaphoid body is composed of a head, a body, and a tail, and has an irregular shape similar to the human scaphoid bone. The support body is composed of a ball head, a neck collar, and a handle. A spherical socket is formed at the body of the scaphoid body opposite to the ball head of the support body, forming a ball-and-socket joint with the ball head. The handle is a screw-in handle, a long tapered screw-type structure with an external thread, and a rough coating. The above structure is implanted into the radial carpal joint using an implantation instrument to achieve reconstruction of the radiocarpal joint.

[0006] In the screw-in ball-and-socket joint artificial navicular bone as described above, the ball head is a spherical shape with a smooth surface, and the neck collar is a circular ring structure.

[0007] In the above-mentioned artificial navicular bone of the screw-in ball-and-socket joint, the navicular bone body is made of polyethylene or other wear-resistant materials, and the support body is made of metal or alloy.

[0008] The navicular body is composed of a head, a body and a tail, and has an irregular shape similar to the navicular bone of the human body. A spherical socket is provided at the position where the body is opposite to the support body, forming a ball-and-socket joint with the ball head of the support body.

[0009] Compared with the prior art, the advantages and positive effects of the present invention are:

[0010] The artificial scaphoid bone with a screw-in ball-and-socket joint of the present invention is easy and convenient to use, and can rebuild and restore a relatively normal radiocarpal joint gap. The scaphoid body simulates the irregular shape of a normal scaphoid bone, and its head, body and tail can align with the trapezium, lunate and distal radius articular surfaces, reducing adjacent bone degeneration caused by friction on adjacent carpal bones. The ball-and-socket joint formed by the spherical socket of the scaphoid body and the ball head of the support body has a high degree of freedom, which can maintain the natural rotation, flexion and extension range of motion of the reconstructed radiocarpal joint, maintain a normal radiocarpal joint gap, and avoid wear and tear between the artificial scaphoid body and the distal radius and long-term joint gap narrowing problems. The neck collar of the support body can prevent the long-term support body from sinking in the radius, avoiding the narrowing of the radiocarpal joint gap. The rough coating of the screw-in support body can produce a bone growth effect and produce good long-term stability. The structural characteristics of the device of the invention can disperse stress, maintain good mobility, and reconstruct the radiocarpal joint well.

[0011] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0013] Figure 1 This is a schematic diagram of the overall structure of the screw-in ball-and-socket joint artificial scaphoid of the present invention;

[0014] Figure 2 The present invention is a schematic structural diagram of an artificial scaphoid bone of a screw-in ball-and-socket joint implanted into a human radial wrist joint. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] Navicular bone necrosis, collapse, and nonunion fractures often lead to symptoms such as wrist pain and decreased range of motion. Currently, there is a lack of implants suitable for restoring the original scaphoid function while preserving the space and range of motion of the radiocarpal joint. To address this problem, the present invention designs a screw-in ball-and-socket artificial scaphoid bone. This reconstructs the original scaphoid function, preserves the radiocarpal joint's flexion, extension, and rotation range of motion, reduces pressure on the radial side of the wrist, and alleviates pain symptoms.

[0017] The following describes the implementation of the present invention in detail with reference to the accompanying drawings:

[0018] like Figure 1As shown, this embodiment proposes a screw-in ball-and-socket joint artificial scaphoid. This implant is used to reconstruct the original scaphoid function while preserving the space and range of motion of the radiocarpal joint. The implant consists of a scaphoid body 10 and a support body 20. The scaphoid body 10 is made of a wear-resistant polyethylene material, and the support body 20 is made of metal or an alloy. The scaphoid body 10 has an irregular shape similar to that of the human scaphoid, consisting of a head 11, a body 12, and a tail 13. A spherical socket 14 is formed at the point where the body 12 faces the support body 20, forming a ball-and-socket joint with the ball head 21 of the support body 20. The support body 20 consists of a ball head 21, a collar 22, and a stem 23. The ball head 21 is a smooth sphere, the collar 22 is an annular structure, and the stem 23 is a screw-in stem, a long, tapered screw-like structure with external threads and a rough coating. This structure is implanted into the radial carpal joint using an implantation device to achieve radiocarpal joint reconstruction.

[0019] This embodiment accurately implants a screw-in ball-and-socket joint artificial scaphoid into the radiocarpal joint, which can reconstruct the normal radiocarpal joint space, preserve the radiocarpal joint range of motion, reduce friction with adjacent carpal bones, avoid narrowing of the radiocarpal joint space, and produce the effect of replacing the necrotic scaphoid bone.

[0020] When applied, such as Figure 2 As shown, the radiocarpal joint is exposed, the necrotic or diseased scaphoid is removed, the scaphoid body 10 of the artificial scaphoid bone of the screw-in ball-and-socket joint is placed in the original anatomical position of the scaphoid, the ideal corresponding position is marked on the corresponding distal radial articular surface, the scaphoid body is removed, a bone tunnel is drilled with a drill bit at the marked position of the distal radius, and then a ring drill with the same diameter as the neck is drilled into the bone of the distal radius to a depth the same as the thickness of the neck, and the residual bone in the neck is bitten off; the support body 20 is screwed into the bone tunnel until the neck is partially immersed in the previously created neck gap; the radiocarpal joint is expanded by flexion and extension, the scaphoid body is placed in the original anatomical position of the scaphoid, the ball head of the support body enters the spherical socket of the body of the scaphoid body, the radiocarpal joint is reset, and the implantation of the artificial scaphoid bone of the screw-in ball-and-socket joint is completed.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A screw-in ball-and-socket joint artificial navicular bone, characterized in that: The screw-in ball-and-socket joint artificial scaphoid is an implant used to reconstruct the original scaphoid function and retain the space and range of motion of the radiocarpal joint, and comprises a scaphoid body and a support body. The scaphoid body is composed of a head, a body and a tail, and has an irregular shape similar to that of the human scaphoid. The support body is composed of a ball head, a neck collar and a handle. A spherical socket is provided at the body of the scaphoid body opposite to the ball head of the support body, forming a ball-and-socket joint with the ball head. The handle is a screw-in handle, which is a long conical screw-type structure with external threads and a rough coating. The ball head is a round sphere with a smooth surface, and the neck collar is a circular ring structure. The scaphoid body is made of polyethylene wear-resistant material, and the support body is made of alloy. During application, the radiocarpal joint is exposed, the diseased scaphoid is removed, the scaphoid body of the screw-in ball-and-socket joint artificial scaphoid is placed in the original anatomical position of the scaphoid, the ideal corresponding position is marked on the corresponding distal radial articular surface, the scaphoid body is removed, a bone tunnel is drilled at the marked position at the distal end of the radius with a drill bit, and then a trephine drill with the same diameter as the collar is drilled into the bone of the distal radius to the same depth as the thickness of the collar, and the residual bone at the collar is bitten off; The support body is screwed into the bone tunnel until the neck part is immersed in the previously made neck gap; flexion and extension are performed to expand the radiocarpal joint, the scaphoid body is placed into the original anatomical position of the scaphoid bone, the ball head of the support body is inserted into the spherical socket of the scaphoid body, and the radiocarpal joint is repositioned, thus completing the implantation of the artificial scaphoid bone with a screw-in ball-and-socket joint.

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