CN115363829A

CN115363829A - Artificial lunate prosthesis and preparation method and clamping tool thereof

Info

Publication number: CN115363829A
Application number: CN202211139463.7A
Authority: CN
Inventors: 王斌; 蔡兴博; 张悦; 张必欢; 徐永清
Original assignee: 920th Hospital of the Joint Logistics Support Force of PLA
Current assignee: 920th Hospital of the Joint Logistics Support Force of PLA
Priority date: 2022-09-19
Filing date: 2022-09-19
Publication date: 2022-11-22
Anticipated expiration: 2042-09-19
Also published as: CN115363829B

Abstract

The invention discloses an artificial lunar prosthesis, which comprises a lunar prosthesis and a threading hole; the threading hole is arranged in the lunar prosthesis and is integrally connected with the lunar prosthesis. The invention also discloses a preparation method of the artificial lunar prosthesis, which comprises the following steps: s1, determining a three-dimensional model of a lunar prosthesis according to a wrist CT image of a patient; s2, determining a threading hole according to the specific condition of a patient; and S3, printing the lunar prosthesis with the threading holes by using a 3D printing and forming technology. The invention also discloses a clamping tool of the artificial lunar prosthesis, which comprises a fixed bracket, a movable bracket and a bottom frame; the bottom of the fixed bracket is fixedly connected with the underframe; the movable bracket is connected with the underframe in a sliding way; the tops of the fixed support and the movable support are matched with the threading holes.

Description

Artificial lunate prosthesis and preparation method and clamping tool thereof

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an artificial lunar prosthesis, a preparation method thereof and a clamping tool.

Background

At present, different surgical methods exist clinically aiming at the lunar necrosis in stages II to IV, and each surgical method has advantages and disadvantages. The common surgical methods include biological and biomechanical methods, lunar resection with tendon and bone replacement, limited carpal fusion (STTF), proximal carpal resection, and total carpal fusion. However, in patients with stage III-IV lunar necrosis, carpal bone restriction fusion (STTF fusion), proximal carpal resection and total carpal joint fusion have great sacrifice on the functions of the carpal joints.

The inventor designs an artificial lunar prosthesis aiming at preserving the normal intercarpal anatomical structure and maximally preserving the function of the wrist joint. The artificial prosthesis replaces the lunar bone with ischemic necrosis to maintain the anatomical relationship and stability of each carpal bone and improve the function of the carpal joint.

The invention aims at the problems and provides an artificial lunar prosthesis, a preparation method thereof and a clamping tool.

Disclosure of Invention

In order to overcome the problems in the background art, the invention provides an artificial lunar prosthesis, a preparation method thereof and a clamping tool.

An artificial lunar prosthesis, which comprises a lunar prosthesis and a threading hole; the threading hole is arranged in the lunar prosthesis and is integrally connected with the lunar prosthesis; the lunar prosthesis is made of titanium alloy materials.

A preparation method of the artificial lunar prosthesis comprises the following steps:

s1, determining a three-dimensional model of a lunar prosthesis according to a wrist CT image of a patient;

s2, determining a threading hole according to the specific condition of a patient;

and S3, printing the lunar prosthesis with the threading holes by using a 3D printing and forming technology.

A clamping tool for an artificial lunar prosthesis comprises a fixed bracket, a movable bracket and a bottom frame; the bottom of the fixed bracket is fixedly connected with the underframe; the movable bracket is connected with the underframe in a sliding way; the tops of the fixed support and the movable support are matched with the threading holes. And the corners of the underframe are provided with mounting structures which are fixedly connected with the underframe. The chassis may be mounted to the table using a mounting structure.

In some embodiments of the present application, the movable bracket comprises a movable arm and a locking device; the locking device is rotationally connected with the fixed bracket; the locking device is connected with the underframe in a sliding manner; the sliding arm is connected with the locking device in a sliding mode.

Further, the locking device comprises an adjusting arm, a first locking structure and a second locking structure; the first locking structure is rotatably connected with the adjusting arm; the first locking structure is connected with the underframe in a sliding manner; the second locking structure is in threaded connection with the movable arm; the second locking structure is detachably connected with the adjusting arm.

The invention has the beneficial effects that: the bioengineering titanium alloy has the advantages of strong corrosion resistance, good compatibility with human cell tissues, no anaphylactic reaction, higher strength and lower elastic modulus; the 3D printing model can be used for manufacturing personalized and refined artificial prostheses, simulating operations on the model and carrying out risk assessment; personalized built-in articles and prostheses can better meet individual differences of patients; the lunar prosthesis printed by 3D can restore the positions of the lunar joint and the lunar radial joint, realize the tight combination between the proximal carpal row bones and reserve the function and the stability of the wrist joint to the maximum extent.

Drawings

FIG. 1 is a front view of a lunar prosthesis according to the present invention;

FIG. 2 is a rear view of the lunar prosthesis according to the invention;

FIG. 3 is a schematic view of a clamping tool according to the present invention;

FIG. 4 is a schematic view of a first end face of a printed lunar prosthesis in accordance with the present invention;

FIG. 5 is a schematic view of a second end face of the lunar prosthesis printed using a clamping tool according to the present invention;

FIG. 6 is a schematic view of the present invention using a gripping tool to print a lunar prosthesis;

FIG. 7 is a cross-sectional view of a gripping tool of the present invention;

FIG. 8 is a schematic structural view of a locking device according to further embodiments of the present invention;

FIG. 9 is a cross-sectional view of a locking device according to further embodiments of the present invention;

FIG. 10 is a schematic view of a locking device according to other embodiments of the present invention;

FIG. 11 is a cross-sectional view of a locking device according to further embodiments of the present invention;

FIG. 12 is a schematic structural view of a first locking structure in accordance with further embodiments of the present invention;

FIG. 13 is a schematic illustration of a movable arm according to further embodiments of the present invention;

FIG. 14 is a schematic view of printing a second end face of a lunar prosthesis using a clamping tool in accordance with further embodiments of the present disclosure;

FIG. 15 is a schematic view of a lunar prosthesis printed using a clamping tool according to further embodiments of the present invention;

in the figures, 1, a lunar prosthesis; 11. a threading hole; 21. fixing a bracket; 22. a movable support; 221. a movable arm; d1, a sliding block; 222. a locking device; c1, a sliding chute; 223. a first locking structure; a1, a knob; a2, connecting structure; a3, locking a plug; 224. a rotating structure; 225. a second locking structure; b1, fixing blocks; b2, rotating the roller; 23. a chassis; 231. a locking groove; 24. a mounting structure; 3. a work bench.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below by specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and other advantages and effects of the present invention can be easily understood by those skilled in the art from the disclosure of the present specification. The present invention can be implemented or applied by other different specific embodiments, and the features in the following embodiments and embodiments can be combined with each other without conflict, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Example 1

An artificial lunar prosthesis as shown in fig. 1-2, which comprises a lunar prosthesis and a threading hole; the threading hole is arranged in the lunar prosthesis and is integrally connected with the lunar prosthesis.

The lunar prosthesis 1 is manufactured according to the physiological condition of a patient, and each lunar prosthesis 1 can be customized according to the requirements of different patients due to the adoption of a 3D printing technology in the manufacturing process, so that the individual difference of the patients can be better met; the 3D printed lunar prosthesis 1 can restore the positions of the lunar joint and the lunar joint, and also realizes the tight combination between the proximal carpal row bones, thereby keeping the function and the stability of the carpal joint to the maximum extent.

Meanwhile, the lunar prosthesis 1 is made of titanium alloy materials, and the titanium alloy has the advantages of strong corrosion resistance, good compatibility with human body cell tissues, no anaphylactic reaction, high strength and low elastic modulus. The lunar prosthesis 1 can be used for a long time, and simultaneously, the patient is ensured not to take anti-rejection medicines for a long time, so that the immunity of the patient is reduced.

Example 2

A clamping tool of an artificial lunar prosthesis 1 as shown in fig. 3-7, which comprises a fixed bracket 21, a movable bracket 22 and a bottom bracket 23; the bottom of the fixed bracket 21 is fixedly connected with the underframe 23; the movable bracket 22 is connected with the bottom frame 23 in a sliding way; the top parts of the fixed bracket 21 and the movable bracket 22 are matched with the threading hole 11. The bottom of the chassis 23 is provided with a mounting structure 24, and the mounting structure 24 is fixedly connected with the chassis 23. The chassis 23 may be mounted to the table 3 using mounting structure 24.

The chute C1 is provided inside the bottom frame 23. The movable bracket 22 includes a movable arm 221 and a slider D1. The slider D1 is disposed at the bottom of the movable arm 221, and the movable arm 221 is fixedly connected to the slider D1. The slider D1 is installed in the inside of spout C1, slider D1 and spout C1 sliding connection. A through hole parallel to the chute C1 is provided inside the bottom frame 23. The through hole is internally provided with a rotating roller B2, the rotating roller B2 penetrates through the through hole to enter the sliding groove C1 and is in threaded connection with the sliding block D1, and the sliding block D1 can be pushed to slide in the sliding groove C1 by rotating the rotating roller B2. When the tops of the fixed bracket 21 and the movable bracket 22 are inserted into the threading holes 11, the rotating roller B2 is further rotated to tightly hold the lunar prosthesis 1 by the fixed bracket 21 and the movable arm 221, so that the lunar prosthesis 1 is limited on the top of the holding tool as if chopsticks hold food.

Specifically, the chute C1 is a T-shaped groove, and the sliding block D1 is of a T-shaped block structure matched with the chute C1. The inside setting of slider D1 and the screw hole of live-rollers B2 adaptation. The through-hole is a counter-sunk hole which starts from the outer side wall of the chassis 23 and leads to the chute C1. One end of the rotating roller B2 is provided with an expansion structure matched with the counter bore, so that the rotating roller B2 is firmly clamped, and the phenomenon that the rotating roller B2 is displaced in the clamping process to cause the displacement of the lunar prosthesis 1 is prevented. One end of the expansion structure far away from the rotating roller B2 is provided with a screwing structure convenient to rotate. Alternatively, the tightening structure is a cross recess or a hexagonal socket. In order to ensure a close fit of the rotating roller B2 with the through hole, the addendum circle diameter of the screw thread of the rotating roller B2 is smaller than or equal to the outer diameter of the rotating roller B2.

In order to enhance the force of the clamping tool, the fixed bracket 21 and the movable arm 221 are in a column structure with a thin top and a thick bottom. The top of the fixed bracket 21 and the movable arm 221 are matched with the threading hole 11.

The chassis 23 is a T-shaped block structure. The mounting structures 24 are respectively provided at corners of the chassis 23. Specifically, the mounting structure 24 includes a counter bore, and one counter bore is provided at each corner of the chassis 23. When in use, the bolt is fixed on the workbench 3 after passing through the countersunk hole.

Example 3

A method of manufacturing an artificial lunar prosthesis 1 as shown in fig. 4-6, wherein:

s1, determining a three-dimensional model of a lunar prosthesis 1 according to a wrist CT image of a patient; presume the three-dimensional model of the lunar prosthesis 1 according to the shape of the healthy side lunar bone of the patient or according to the physiological condition of the healthy bone around the diseased lunar bone;

specifically, the method of step S1 is roughly divided into two types:

1. if the single-side lunar bone of the patient is diseased, the two lunars bones are well developed and have similar shapes, the CT image of the healthy side lunar bone of the patient needs to be acquired, and the three-dimensional model of the lunar prosthesis 1 can be obtained after the CT image is subjected to mirror image processing.

2. If the patient has lesions on both sides of the lunar bone or has large difference in the shapes of both sides of the lunar bone, a CT image of one side of the lunar bone to be replaced by the patient is acquired, and the three-dimensional model of the lunar prosthesis 1 is estimated according to the physiological conditions of healthy bones around the lunar bone in the acquired CT image.

S2, determining a threading hole 11 according to the specific condition of a patient;

and S3, printing the lunar prosthesis 1 with the threading holes 11 by using a 3D printing and forming technology.

Specifically, step S3 may be subdivided into the following steps:

s3-1, splitting the three-dimensional model into a first end face and a second end face;

the three-dimensional model is divided into a first end face and a second end face along a parting face because the outside of the moon is a smooth face and a plane which can provide a reference for 3D printing equipment in the 3D printing process is not provided; for making clamping tool can play better centre gripping effect at the in-process that 3D printed, the die joint of first terminal surface and second terminal surface is perpendicular with the axial lead of through wires hole 11.

After the first end face of the lunar prosthesis 1 is printed, under the influence of high temperature of the 3D printing device, the bottom of the first end face, namely a parting surface, is welded with the workbench 3, and the second end face needs to be printed after the first end face and the workbench 3 of the 3D printing device are cut. Therefore, before the three-dimensional model is sliced, a cutting table needs to be arranged on the parting plane of the first end surface. Specifically, the thickness of the cutting table is more than 1mm, and the cutting table is of a square block structure.

S3-2, slicing the three-dimensional model;

the process is an indispensable step in the 3D printing technology, the integral three-dimensional model is split into the lunar prosthesis 1 model with the set thickness, the process is similar to the action of cutting the whole article into pieces in daily life, and the three-dimensional model is cut by the step.

Specifically, the slice thickness is in the range of 0.025mm to 0.2mm, and preferably in the range of 0.025 to 0.1mm. The minimum moving distance of the Z axis is 0.025mm. The lower the slice thickness, the lower the surface roughness of the printed product. The thickness range of the slice is set to be 0.025mm-0.2mm, so that the surface roughness of the lunar prosthesis 1 is greatly reduced, and the surface of the lunar prosthesis 1 is smoother and smoother.

S3-3, printing the first end face;

directly printing a first end face of the lunar prosthesis 1 on a workbench 3 of a 3D printing device;

after the first end face is printed, the first end face and the cutting table are cut to separate the first end face from the workbench 3, and meanwhile, the first end face and the workbench 3 are not damaged. And in the process of cutting the first end surface and the workbench 3, cutting is carried out in an electric machining mode. Specifically, a slow wire-moving mode is selected to separate the first end face from the workbench 3. The slow-speed wire, also called low-speed wire, is a kind of numerically controlled machine tool which uses continuously moving fine metal wire as electrode to make pulse spark discharge to workpiece, and can produce high temp. above 6000 deg.C, remove metal and cut into workpiece. The machining principle of the slow wire moving is that a gap exists between a wire electrode and a workpiece, and metal is removed through continuous discharge. The precision of the processing method is within +/-0.002 mm.

Specifically, the slow-speed wire cutting method comprises the following steps:

1. clamping the workbench 3 into the slow-moving wire cutting machine to ensure that the workbench 3 is vertical to the horizontal direction;

2. calibrating to ensure that the error of the workbench 3 in a vertical plane is within 0.002 mm;

3. cutting for the first time to separate the first end face from the cutting table;

4. and a second cutting, separating the cutting table from the worktable 3.

S3-4, printing a second end face;

a clamping tool is used in the process of preparing the second end; after the printed first end face is taken down from the workbench 3, the clamping tool is fixed at the top of the workbench 3, the printed first end face is clamped on the clamping tool in a parting face-up posture, and then the 3D printing equipment is started to print the second end face.

The clamping tool needs to be mounted on the table 3 of the 3D printing device before the second end face is printed.

The mounting steps of the clamping tool are as follows:

1. cleaning the bottom surfaces of the worktable 3 and the underframe 23;

2. the table 3 is mounted using mounting structure 24 at the bottom of the clamping tool. Specifically, as shown in fig. 3, the mounting structure 24 is a countersunk hole, each corner of the bottom frame 23 is provided with a countersunk hole, and a bolt is screwed on the workbench 3 through the countersunk hole, and at this time, the bolt needs to be installed diagonally;

3. and (3) applying a dial indicator to correct the clamping tool, so that the error of the bottom frame 23 in the X and Y directions is within 0.002mm, and the error of the fixed support 21 in the Y direction is within 0.002 mm.

After the clamping tool is installed, the first end face needs to be installed on the clamping tool, and the installation steps are as follows:

1. clamping the first end face at the top of the clamping tool, inserting the tops of the fixed support 21 and the movable support 22 of the clamping tool into the threading hole 11, and ensuring that the tops of the fixed support 21 and the movable support 22 do not protrude out of parting faces to prevent the fixed support 21 and the movable support 22 from being thermally bonded with the lunar prosthesis 1 under the action of high temperature in the printing process;

2. calibrating, namely calibrating the planeness of the parting surface by using a dial indicator with a horizontal plane as a reference, and ensuring that the error is within 0.002 mm;

3. and filling, namely filling a mixture of titanium alloy powder and a binder into the threading hole 11 from the top of the parting surface, and further preventing the fixed bracket 21 and the movable bracket 22 from being thermally sealed with the lunar prosthesis 1 under the action of high temperature.

After completion, the operation of printing the second end face can be performed.

Preferably, the preparation method further comprises the following steps:

and S4, carrying out post-treatment on the lunar prosthesis 1 with the threading holes 11 obtained in the step S3.

Specifically, step S4 may be subdivided into the following steps:

s4-1, surface treatment:

after the lunar prosthesis 1 is printed, the lunar prosthesis 1 is taken down from the clamping tool, then the surface of the lunar prosthesis 1 is ground, the joint mark of the lunar prosthesis 1 at the parting surface is removed, and the surface quality of the lunar prosthesis 1 is improved.

After the lunar prosthesis 1 is printed, the lunar prosthesis 1 is taken down from the clamping tool, then the surface of the lunar prosthesis 1 is polished, the joint mark of the lunar prosthesis 1 at the parting surface is removed, and the surface quality of the lunar prosthesis 1 is improved;

in this process, need be with the inside titanium alloy powder of through wires hole 11 and the mixture clean up of adhesive to polish the inner wall of through wires hole 11, to there is the burr on the inner wall of through wires hole 11, and result in the implantation in-process of lunar prosthesis 1, the burr on the inner wall of through wires hole 11 cuts off the pull wire.

S4-2, stress removing treatment:

and (3) putting the polished lunar prosthesis 1 into a heating kettle for heating so as to remove the internal stress of the lunar prosthesis 1 and prolong the service life of the lunar prosthesis 1.

Example 4

As shown in fig. 8 to 15, other embodiments of the present application include a holding tool including a fixed bracket 21, a movable bracket 22, and a base frame 23; the bottom of the fixed bracket 21 is fixedly connected with the underframe 23; the movable bracket 22 is rotationally connected with the fixed bracket 21; the movable bracket 22 is connected with the bottom frame 23 in a sliding way; the tops of the fixed bracket 21 and the movable bracket 22 are matched with the threading holes 11. And a mounting structure 24 is arranged at the corner of the underframe 23, and the mounting structure 24 is fixedly connected with the underframe 23. The chassis 23 may be mounted to the table 3 using mounting structures 24.

The movable support 22 is rotatably connected with the fixed support 21, so that the angle adjustment of the movable support 22 is realized. The movable support 22 is connected with the bottom frame 23 in a sliding mode, and the distance between the movable support 22 and the fixed support 21 is adjusted.

The movable bracket 22 comprises a movable arm 221 and a locking device 222; the locking device 222 is rotatably connected with the fixed bracket 21; the locking device 222 is slidably connected with the chassis 23; the sliding arm is slidably connected to the locking device 222.

Locking device 222 includes an adjustment arm, a first locking structure 223 and a second locking structure 225; the first locking structure 223 is rotatably connected with the adjustment arm; the first locking structure 223 is slidably connected with the chassis 23; the second locking structure 225 is in threaded connection with the movable arm 221; the second locking structure 225 is removably connected to the adjustment arm. The first locking structure 223 is used to lock the rotation angle of the movable bracket 22, and the second locking structure 225 is used to lock the distance between the movable bracket 22 and the fixed bracket 21.

The adjusting arm is provided with a rotating structure 224 which is used for being rotatably connected with the fixed bracket 21. In particular, the rotational structure 224 includes a bearing. The inner wall of bearing and fixed bolster 21 lateral wall fixed connection, the outer wall of bearing and the inside wall fixed connection of regulating arm.

A locking groove 231 is provided at the top of the bottom chassis 23. The first locking structure 223 includes a knob A1, a connecting structure A2, and a locking plug A3. Connection structure A2's one end can be dismantled with knob A1 and be connected, the other end and locking plug A3 fixed connection, and connection structure A2 rotates with the regulating arm to be connected. The locking plug A3 is slidably coupled to the locking groove 231. The knob A1 is rotated, and the locking plug A3 is driven to rotate through the connecting structure A2. Specifically, locking stopper A3 is oval columnar structure, adopts the rubber material preparation, and locking stopper A3's major diameter is greater than the width of locking groove 231, and locking stopper A3's path is less than the width of locking groove 231. The adjusting arm is adjusted to a proper angle, the knob A1 is rotated, the locking plug A3 is enabled to hold the inner wall of the locking groove 231, the adjusting arm is locked, and friction force is applied to prevent the adjusting arm from rotating.

Preferably, an angle dial is arranged on the top of the underframe 23, a window and a mark are arranged on the axis of the adjusting arm, the angle dial can be seen through the window, and the mark is used for identifying and adjusting the angle of the current adjusting arm.

The chute C1 and the mounting location are disposed at an end of the adjustment arm away from the first locking structure 223. The bottom of the movable arm 221 is provided with a slider D1. The second locking structure 225 includes a fixed block B1 and a rotating roller B2. The fixed block B1 is arranged inside the installation position. Fixed block B1 and live-rollers B2 can dismantle and be connected. The chute C1 is connected with the sliding block D1 in a sliding mode, and the sliding block D1 is arranged inside the chute C1. The fixed block B1 is provided with a counter bore, the rotating roller B2 penetrates through the counter bore to enter the slideway and is in threaded connection with the sliding block D1, and the sliding block D1 can be pushed to slide in the sliding chute C1 by rotating the rotating roller B2. When the tops of the fixed bracket 21 and the movable bracket 22 are inserted into the threading holes 11, the rotating roller B2 is further rotated to tightly hold the lunar prosthesis 1 by the fixed bracket 21 and the movable arm 221, so that the lunar prosthesis 1 is limited on the top of the holding tool as if chopsticks hold food.

Specifically, the chute C1 is a T-shaped groove, and the sliding block D1 is of a T-shaped block structure matched with the chute C1. The inside setting of slider D1 and live-rollers B2 adaptation's screw hole. One end of the rotating roller B2 is provided with an expanding structure matched with the counter bore, so that the rotating roller B2 is firmly clamped, and the lunar prosthesis 1 is prevented from being displaced due to the displacement of the rotating roller B2 in the clamping process. One end of the expansion structure far away from the rotating roller B2 is provided with a screwing structure convenient to rotate. Alternatively, the tightening structure is a cross recess or a hexagonal socket. In order to ensure a close fit of the rotating roller B2 with the through hole, the addendum circle diameter of the screw thread of the rotating roller B2 is smaller than or equal to the outer diameter of the rotating roller B2.

The above description of the embodiments is only for the understanding of the present invention. It should be noted that modifications could be made to the invention without departing from the principle of the invention, which would also fall within the scope of the claims of the invention.

Claims

1. An artificial lunar prosthesis, which comprises a lunar prosthesis and a threading hole; the lunar prosthesis is characterized in that the threading hole is arranged inside the lunar prosthesis and is integrally connected with the lunar prosthesis; the lunar prosthesis is made of titanium alloy materials.

2. A method for preparing an artificial lunar prosthesis according to claim 1, comprising the steps of:

s3, printing the lunar prosthesis with the threading holes by using a 3D printing and forming technology;

preferably, the preparation method further comprises the following steps:

s4, carrying out post-treatment on the lunar prosthesis with the threading holes obtained in the step S3 to obtain the artificial lunar prosthesis as claimed in claim 1;

preferably, a clamping tool is used in the process of preparing the second end;

preferably, the specific operation of step S3 is as follows:

s3-2, respectively slicing the first end face and the second end face;

s3-3, printing the first end face;

s3-4, printing the second end face;

preferably, the specific operation of step S4 is as follows:

s4-1, surface treatment;

s4-2, stress removing treatment.

3. The preparation method according to claim 2, wherein the specific operation method of step S1 is as follows:

acquiring a CT image of the healthy side lunar bone of a patient, and performing mirror image processing on the CT image to obtain a three-dimensional model of the required lunar prosthesis;

or acquiring a CT image of the side of the lunar bone to be replaced by the patient, and presuming a three-dimensional model of the lunar prosthesis according to the physiological condition of healthy bones around the lunar bone in the acquired CT image.

4. The method according to claim 2 or 3, wherein the step S3-1 is specifically performed as follows: splitting the three-dimensional model along a splitting surface into a first end surface and a second end surface;

preferably, the parting plane of the first end face and the second end face is perpendicular to the axis of the threading hole.

5. The method for preparing an artificial lunar prosthesis according to claim 4, wherein a cutting table is arranged on the parting plane of the first end face before the step S3-2;

preferably, the cutting table has a thickness of 1mm or more;

preferably, after the first end face is printed, the first end face is cut from a workbench of the 3D printing device, and then the second end face is printed;

preferably, the first end face and the cutting table are cut in an electric machining mode;

preferably, the cutting of the first end surface and the cutting table is performed in a slow-moving manner.

6. The production method according to claim 2, wherein in step S3-2, the sliced sheet has a layer thickness in the range of 0.025mm to 0.2mm;

preferably, the layer thickness is in the range of 0.025-0.1mm.

7. The manufacturing method according to claim 2, wherein after step S3-3, step S3-4 is performed using a holding tool;

preferably, before the second end face is printed by applying the clamping tool, the clamping tool is mounted on a workbench of the 3D printing device;

preferably, the first end face is mounted to the gripping tool.

8. A holder for an artificial lunar prosthesis, which is used in the method for preparing an artificial lunar prosthesis according to any one of claims 2 to 7, and comprises a fixed bracket, a movable bracket and a base frame; the bottom of the fixed bracket is fixedly connected with the underframe; the movable bracket is connected with the underframe in a sliding way; the tops of the fixed bracket and the movable bracket are matched with the threading holes;

preferably, a mounting structure is arranged at a corner of the underframe, and the mounting structure is fixedly connected with the underframe.

9. The tool for preparing an artificial lunar prosthesis according to claim 8, wherein a sliding groove is provided inside the bottom frame; the movable bracket comprises a movable arm and a sliding block; the sliding block is arranged at the bottom of the movable arm, and the movable arm is fixedly connected with the sliding block; the sliding block is arranged in the sliding groove and is connected with the sliding groove in a sliding manner; a through hole parallel to the sliding groove is formed in the bottom frame;

preferably, the sliding groove is a T-shaped groove, and the sliding block is of a T-shaped block structure matched with the sliding groove; a threaded hole matched with the rotating roller is formed in the sliding block; the through hole is a counter bore which is communicated with the chute from the outer side wall of the underframe; one end of the rotating roller is provided with an expansion structure matched with the counter sink;

preferably, one end of the expansion structure, far away from the rotating roller, is provided with a tightening structure convenient to rotate;

preferably, the tightening structure is a cross groove or an inner hexagonal groove;

preferably, the fixed support and the movable arm are in a columnar structure with a thin upper part and a thick lower part; the tops of the fixed bracket and the movable arm are matched with the threading holes;

preferably, the underframe is of a T-shaped block structure; the mounting structures are respectively arranged at the corners of the underframe.

10. The tool for preparing an artificial lunar prosthesis according to any one of claims 8, wherein the movable bracket is rotatably connected with the fixed bracket to realize the angle adjustment of the movable bracket; the movable support is connected with the underframe in a sliding manner, so that the distance between the movable support and the fixed support is adjusted;

preferably, the movable support comprises a movable arm and a locking device; the locking device is rotationally connected with the fixed bracket;

the locking device is connected with the underframe in a sliding way; the sliding arm is connected with the locking device in a sliding way;

preferably, the locking device comprises an adjusting arm, a first locking structure and a second locking structure; the first locking structure is rotationally connected with the adjusting arm; the first locking structure is connected with the underframe in a sliding manner; the second locking structure is in threaded connection with the movable arm; the second locking structure is detachably connected with the adjusting arm;

preferably, the adjusting arm is provided with a rotating structure which is used for being rotationally connected with the fixed support;

preferably, the rotating structure comprises a bearing; a locking groove is arranged at the top of the underframe; the first locking structure comprises a knob, a connecting structure and a locking plug; one end of the connecting structure is detachably connected with the knob, the other end of the connecting structure is fixedly connected with the locking plug, and the connecting structure is rotatably connected with the adjusting arm; the locking plug is connected with the locking groove in a sliding manner;

preferably, an angle dial is arranged at the top of the underframe, and a window and a mark are arranged on the axis of the adjusting arm; preferably, a sliding groove and a mounting position are arranged at one end of the adjusting arm far away from the first locking structure; the bottom of the movable arm is provided with a sliding block; the second locking structure comprises a fixed block and a rotating roller; the fixed block is arranged inside the mounting position; the fixed block is detachably connected with the rotating roller; the sliding chute is connected with the sliding block in a sliding manner, and the sliding block is arranged inside the sliding chute; the fixed block is provided with a counter bore, and the rotating roller penetrates through the counter bore, enters the slideway and is in threaded connection with the sliding block;

preferably, the sliding groove is a T-shaped groove, and the sliding block is of a T-shaped block structure matched with the sliding groove; a threaded hole matched with the rotating roller is formed in the sliding block; one end of the rotating roller is provided with an expansion structure matched with the counter sink.