阅读说明：本技术 一种部分置换大多角骨假体及其制作方法 (Partially replaced trapezium bone prosthesis and manufacturing method thereof ) 是由 李苗钟 李学渊 胡浩良 田敏涛 方炫量 王欣 杨飞 王丽萍 于 2020-08-20 设计创作，主要内容包括：一种部分置换大多角骨假体及其制作方法,假体包括假体本体,本体的掌侧、背侧以及桡侧设有弧形连接孔,弧形圆柱孔与本体底面之间呈倾斜设置,本体的中央轴近端设有与本体一体成型的连接柱,本体的掌侧具有与第一掌骨相互配合的弧面,制作方法包括对健康志愿者和患者分别进行手腕CT扫描、利用医用软件进行三维重建、在重建的大多角骨模型上进行模拟切割、将健康志愿者切除后剩余的大多角骨模型进行等比缩放,使之与患者第一掌骨基底关节面的大小和曲面匹配、利用3D打印得到大多角骨假体,本发明能部分置换手部骨关节炎中的部分大多角骨,能很好的保留腕关节结构的稳定,防止第一掌骨沉降,减轻关节疼痛,增加关节活动,具有很好的临床前景。(A prosthesis for partially replacing the trapezium bone comprises a prosthesis body, wherein arc-shaped connecting holes are formed in the palm side, the back side and the radial side of the prosthesis body, arc-shaped cylindrical holes are obliquely formed between the arc-shaped cylindrical holes and the bottom surface of the prosthesis body, a connecting column which is integrally formed with the prosthesis body is arranged at the near end of a central shaft of the prosthesis body, the palm side of the prosthesis body is provided with an arc surface which is matched with a first metacarpal bone, the manufacturing method comprises the steps of respectively carrying out wrist CT scanning on healthy volunteers and patients, carrying out three-dimensional reconstruction by using medical software, carrying out simulated cutting on a reconstructed trapezium bone model, carrying out geometric scaling on the remaining trapezium bone model after the healthy volunteers are cut off to enable the model to be matched with the size and the curved surface of the first metacarpal bone basal joint surface of the patients, and obtaining the trapezium bone prosthesis by using 3D printing, the prosthesis can partially replace part of the trapez, prevent the first metacarpal from subsiding, relieve the joint pain, increase the joint movement and have good clinical prospect.)

1. The utility model provides a partial replacement trapezium bone false body which characterized in that, the false body includes the false body, palm side, dorsal part and the radius side of false body are equipped with arc cylinder hole respectively, be the slope setting between arc cylinder hole and the false body bottom surface, the central axis near-end of false body is equipped with the spliced pole with false body integrated into one piece, and the palm side of false body has the cambered surface of mutually supporting with first metacarpal bone.

2. The partially replaced trapezium bone prosthesis of claim 1, wherein the connecting columns are rectangular parallelepiped in shape with a length of 5mm and a base surface area size of 4mm by 4 mm.

3. The partially replaced polygonal bone prosthesis according to claim 1, wherein the depth of the arc-shaped cylindrical hole is 1mm and the diameter is 0.5 mm.

4. The partially replaced polygonal prosthesis of claim 1, wherein the prosthesis body is made of hydrogel material.

5. The partially replaced polygonal bone prosthesis of claim 1, wherein the angle of inclination between the arc-shaped cylindrical hole and the bottom surface of the prosthesis body is 45 °.

6. A method for manufacturing a partially replaced trapezium prosthesis, comprising the steps of:

s1, respectively carrying out wrist CT scanning on the healthy volunteers and the patients, and importing the scanned imaging data into medical software to reconstruct a complete trapezium model;

s2, performing simulated cutting on the reconstructed trapezium bone model of the healthy volunteer to determine the optimal cutting path, and cutting off the proximal end 3/4 along the direction vertical to the central axis of the trapezium bone model;

s3, performing simulated cutting on the reconstructed trapezium model of the patient, determining the optimal cutting path, and cutting off the far end 1/4 along the direction vertical to the central axis of the trapezium model;

s4, replacing the 1/4 trapezium bone model which is left after the healthy volunteer is cut with the 1/4 trapezium bone model which is cut by the patient, and then carrying out equal scaling on the 1/4 trapezium bone model which is left after the healthy volunteer is cut by medical software to enable the model to be matched with the size and the curved surface of the first metacarpal basement articular surface of the patient;

s5, designing a connecting column at the near end of the central shaft of the well matched 1/4 trapezium bone model;

s6, designing arc-shaped cylindrical holes on the palm side, the back side and the radial side of the well matched 1/4 trapezium model;

and S7, printing the designed model by using 3D printing to obtain the partial replacement trapezium prosthesis.

7. The method of claim 5, wherein in step S1, the medical software is Mimics 16.0.

Technical Field

The invention relates to the field of medical supplies, in particular to a prosthesis for partially replacing a trapezium bone and a manufacturing method thereof.

Background

Osteoarthritis is one of the common diseases of the middle-aged and the elderly. The most common site of hand osteoarthritis is the first carpometacarpal joint. Statistically, up to 8% of men and 25% of women over the age of 50 have degenerative arthritis of the thumb carpometacarpal (CMC). CMC arthritis imaging mainly manifests as narrow joint spaces, marginal sclerotin sclerosis and osteophyte; the main clinical manifestations are pain and weakness of the first carpometacarpal joint, and the serious one has subluxation of the joint, reduced mobility or stiffness, which causes the mobility of the thumb to decrease, especially the grip strength and pinching strength to decrease.

For the above CMC diseases, when the drug therapy is ineffective, surgical intervention is required, and depending on the state of illness, in the last 30 years, there have been many studies on the surgical mode of CMC arthritis at home and abroad, mainly depending on the different stages of disease progression, including fixation of trapezium with or without loop steel plate for partial or complete resection, with or without pseudoarthroplasty, tendon stuffing, joint replacement, joint fusion, acellular matrix filling, etc.

However, the above-mentioned surgical approaches each have drawbacks: by using the silica gel prosthesis filling technology, complications such as synovitis around joints, prosthesis falling and the like occur after operation. After CMC fusion, fusion failure exists to a certain extent, and the non-healing rate after the fusion can reach 13%. In addition, elderly patients rarely have isolated carpal and metacarpal arthritis, and there is a risk of developing scaphoid and trapezium osteoarthritis after fusion. The space left after the removal of the trapezium bone brings potential hidden troubles for the sinking of the first metacarpal bone, and further influences the stability of the postoperative joint structure. Additional studies have shown that distal scaphoid instability can be caused following a trapezoidectomy, leading to secondary instability of the non-detachable dorsal insertion segment wrist joint.

Disclosure of Invention

The present invention is directed to overcome the disadvantages of the prior art and to provide a partially replaced trapezium prosthesis and a method for making the same, which solves the problems of the prior art.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a partial replacement trapezium bone false body, the false body includes the false body, palm side, dorsal part and the radius side of false body are equipped with arc cylinder hole respectively, be the slope setting between arc cylinder hole and the false body bottom surface, the central axis near-end of false body is equipped with the spliced pole with false body integrated into one piece, and the palm side of false body has the cambered surface of mutually supporting with first metacarpal bone.

Furthermore, the spliced pole is the cuboid shape, and length is 5mm, and bottom surface area size is 4 mm.

Furthermore, the depth of the arc-shaped cylindrical hole is 1mm, and the diameter of the arc-shaped cylindrical hole is 0.5 mm.

Furthermore, the prosthesis body is made of hydrogel materials.

Furthermore, the inclined angle between the arc-shaped cylindrical hole and the bottom surface of the prosthesis body is 45 DEG

A method for manufacturing a partially replaced trapezium prosthesis comprises the following steps:

s1, respectively carrying out wrist CT scanning on the healthy volunteers and the patients, and importing the scanned imaging data into medical software to reconstruct a complete trapezium model;

s2, performing simulated cutting on the reconstructed trapezium bone model of the healthy volunteer to determine the optimal cutting path, and cutting off the proximal end 3/4 along the direction vertical to the central axis of the trapezium bone model;

s3, performing simulated cutting on the reconstructed trapezium model of the patient, determining the optimal cutting path, and cutting off the far end 1/4 along the direction vertical to the central axis of the trapezium model;

s4, replacing the 1/4 trapezium bone model which is left after the healthy volunteer is cut with the 1/4 trapezium bone model which is cut by the patient, and then carrying out equal scaling on the 1/4 trapezium bone model which is left after the healthy volunteer is cut by medical software to enable the model to be matched with the size and the curved surface of the first metacarpal basement articular surface of the patient;

s5, designing a connecting column at the near end of the central shaft of the well matched 1/4 trapezium bone model;

s6, designing arc-shaped cylindrical holes on the palm side, the back side and the radial side of the well matched 1/4 trapezium model;

and S7, printing the designed simulation model by using 3D printing to obtain the partial replacement trapezium prosthesis.

Further, in step S1, the medical software is miccis 16.0.

The invention has the beneficial effects that: the invention can partially replace part of trapezium bones in hand osteoarthritis, can be well matched with the size and the curved surface of the basal articular surface of the first metacarpal bone of a patient, thereby well keeping the stability of the wrist joint structure, preventing the first metacarpal bone from sinking, relieving joint pain and increasing joint movement.

Drawings

FIG. 1 is a schematic view of the posterior structure of the prosthesis body according to the present invention;

FIG. 2 is a schematic view of a palm-side structure of the prosthesis body of the present invention;

FIG. 3 is a side view of the body of the prosthesis of the present invention;

FIG. 4 is a schematic view of the connection of the prosthesis of the present invention to a trapezium.

In the figure, 1-prosthesis body, 2-arc cylindrical hole, 3-connecting column, 4-arc surface, 5-trapezium bone and 6-first metacarpal bone.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.