A method and device for constructing an expandable prosthesis model suitable for repairing acetabulum defects

Abstract

The present application relates to the field of medical devices, and in particular to a method and device for constructing an expandable prosthesis model suitable for repairing acetabulum defects, the method comprising obtaining three-dimensional scanning data of a 3D printed pelvis filled with an expandable body, separating a model of the expandable body; dividing the outer contour of the model of the expandable body into a plurality of contact areas, with interval areas between adjacent contact areas, and constructing contact surfaces based on the contour surfaces of each contact area; extending toward the center direction of the model of the expandable body based on each contact surface to form a regional module; constructing sliding assemblies for slidingly connecting each adjacent regional module; constructing auxiliary expansion modules for expanding each regional module, the auxiliary expansion modules are suitable for expanding each regional module to form an expandable prosthesis model, and the outer contour of the expandable prosthesis model matches the outer contour of the model of the expandable body. The present invention solves the problem that the existing prosthesis cannot be implanted during surgical implantation due to the influence of protruding bone, osteophytes, etc.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a method and device for constructing an expandable prosthesis model suitable for repairing acetabulum defects. Background Art

[0002] The acetabulum is an important part of the hip joint. Due to the heavy load and large range of motion of the hip joint, it is also easy to be injured. The irregular defects around the acetabulum are mainly caused by infection, inflammation, tumors, congenital malformations, and severe trauma. According to the Harrington grading system, they are mainly divided into: Type I: only the defect below the acetabulum, Type II: the inner wall of the acetabulum is defective and metastasized to the pelvic cavity, Type III: the defect involves the inner wall, lateral edge and upper dome of the acetabulum, and Type IV: a rare defect caused by isolated lesions. The defects around the acetabulum are variable and irregular, which makes the design of the prosthesis and the installation during surgery very difficult.

[0003] Currently, the main solution for irregular bone defects around the acetabulum is to design a personalized pelvic prosthesis for matching implant fixation, such as Figure 7 As shown in the figure, the prosthesis designed by this technology is a whole, but the designed prosthesis cannot be placed in the originally planned ideal position during the actual surgical implantation due to insufficient surgical field exposure or obstruction by protruding bones, osteophytes, etc. In this case, the physician needs to plan a solution during the operation based on his own experience, which may bring a series of chain reactions to the operation and prosthesis fixation. It may cause the final fixed prosthesis to be completely different from the preoperative planned state.

[0004] Therefore, how to solve the above-mentioned technical problems caused by matching implantation and fixation of pelvic prosthesis for irregular bone defects around the acetabulum has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a method and device for constructing an expandable prosthesis model suitable for acetabular defect repair, so as to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the present application provides, on the one hand, a method for constructing an expandable prosthesis model suitable for acetabular defect repair, comprising: obtaining three-dimensional scanning data of a 3D printed pelvis filled with an expandable body, and separating a model of the expandable body, wherein the 3D printed pelvis includes an acetabular defect area; the expandable body is formed by inflating an inflatable elastomer in the acetabular defect area, and the expandable body has multiple contact points with the acetabular defect area; the outer contour of the model of the expandable body is divided into multiple contact areas, and there is a spacing area between adjacent contact areas, and contact surfaces are respectively constructed based on the contour surfaces of each of the contact areas; each of the contact surfaces is extended toward the center direction of the model of the expandable body to form a regional module respectively; a sliding assembly is constructed for slidingly connecting each of the adjacent regional modules; an auxiliary expansion module is constructed for expanding each of the regional modules, and the auxiliary expansion module is suitable for expanding each of the regional modules to form an expandable prosthesis model, and the outer contour of the expandable prosthesis model matches the outer contour of the model of the expandable body.

[0007] In some embodiments of the present invention, the 3D printed pelvis is formed by printing based on a 3D scan and 3D reconstruction of the patient's pelvic region.

[0008] In some embodiments of the present invention, the acetabulum defect area includes an ilium area, a pubic area, and a sciatic area; and the expansion body has one or more contact points with the ilium area, the pubic area, and the sciatic area, respectively.

[0009] In some embodiments of the present invention, the contact surfaces are respectively an ilium contact surface, a sciatic contact surface and a pubic contact surface; based on the ilium contact surface, the sciatic contact surface and the pubic contact surface, they extend toward the center direction of the model of the expansion body to form an ilium expansion area module, a sciatic expansion area module and a pubic expansion area module respectively.

[0010] In some embodiments of the present invention, the auxiliary expansion module is constructed and has a columnar structure, and the diameter of the auxiliary expansion module gradually increases from one end to the other end.

[0011] In some embodiments of the present invention, a first slot module that cooperates with the auxiliary expansion module is constructed based on each regional module, and each of the first slot modules can be combined to form a first accommodating module for accommodating the auxiliary expansion module.

[0012] In some embodiments of the present invention, an acetabular cup module is constructed for connecting the auxiliary distraction module; a second slot module is constructed based on each of the regional modules, and each of the second slot modules can be combined to form a second accommodating module for accommodating part of the acetabular cup module.

[0013] In some embodiments of the present invention, a slide rail module in a sliding assembly is constructed on each area module, and a slider module that cooperates with the slide rail module is constructed; preferably, a limiting block module for limiting the movement position of the slider module is constructed on the slider module; and a limiting groove module that cooperates with the limiting block module is constructed on each contact surface.

[0014] In some embodiments of the present invention, a third accommodating module is constructed based on the auxiliary expansion module, and the third accommodating module is used to accommodate the remaining acetabular modules; preferably, a retaining hole is constructed in the third accommodating module; and a retaining module matching the retaining hole is constructed at the bottom of the acetabular module.

[0015] In some embodiments of the present invention, each of the regional modules is suitable for enclosing and forming an initial expansion prosthesis model when not expanded by the auxiliary expansion module; the size of the initial expansion prosthesis model is suitable for matching the size of the entrance area of ​​the acetabulum defect area.

[0016] On the other hand, the present invention provides a device for constructing an expandable prosthesis model suitable for acetabular defect repair, comprising: an expandable body model acquisition unit, used to acquire three-dimensional scanning data of a 3D printed pelvis filled with an expandable body, and separate a model of the expandable body, wherein the 3D printed pelvis includes an acetabular defect area; the expandable body is formed by inflating an inflatable elastomer in the acetabular defect area, and the expandable body has multiple contact points with the acetabular defect area; a regional module construction unit, used to divide the model outer contour of the expandable body into multiple contact areas, with interval areas between adjacent contact areas, and to construct contact surfaces based on the contour surfaces of each contact area; based on each contact surface extending toward the center direction of the model of the expandable body to form regional modules respectively; a sliding component construction unit, used to construct a sliding component that slidably connects each adjacent regional module; an auxiliary expansion module construction unit, used to construct an auxiliary expansion module that expands each regional module, and the auxiliary expansion module is suitable for expanding each regional module to form an expandable prosthesis model, and the outer contour of the expandable prosthesis model matches the model outer contour of the expandable body.

[0017] On the other hand, the present invention provides a method for preparing an expandable prosthesis suitable for acetabular defect repair, the method comprising: constructing an expandable prosthesis model suitable for acetabular defect repair according to the method for constructing an expandable prosthesis model suitable for acetabular defect repair as described above, and preparing an expandable prosthesis suitable for acetabular defect repair.

[0018] Another aspect of the present invention provides an expandable prosthesis suitable for repairing acetabular defects, which is constructed by the aforementioned method for constructing an expandable prosthesis model suitable for repairing acetabular defects, or prepared by the aforementioned method for preparing an expandable prosthesis suitable for repairing acetabular defects.

[0019] In some embodiments of the present invention, an expandable prosthesis suitable for acetabular defect repair includes a plurality of regional prosthetic parts suitable for cooperating with the acetabular defect area, a spacer is provided between adjacent regional prosthetic parts, adjacent regional prosthetic parts are connected by a sliding assembly, and also includes an auxiliary expansion part for expanding each of the regional prosthetic parts.

[0020] Another aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for constructing an expandable prosthesis model suitable for repairing acetabular defects as described above.

[0021] Another aspect of the present invention provides a device, comprising: a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory so that the device performs the steps of the method for constructing an expandable prosthesis model suitable for acetabular defect repair as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a method for constructing an expandable prosthesis model suitable for repairing acetabulum defects in the present application.

[0023] Figure 2 Shown is a schematic diagram of the exploded structure of the expandable prosthesis suitable for repairing acetabulum defects according to the present application.

[0024] Figure 3 It is a schematic structural diagram showing the contracted state of the expandable prosthesis suitable for repairing acetabulum defects of the present application (the acetabular cup is not shown).

[0025] Figure 4 Shown is a schematic diagram of the three-dimensional structure of the expandable prosthesis suitable for acetabular defect repair of the present application, which is pre-implanted into the acetabular defect position.

[0026] Figure 5 Shown is a schematic diagram of the three-dimensional structure of the expandable prosthesis suitable for acetabular defect repair of the present application implanted in the acetabular defect position.

[0027] Figure 6 It shows a schematic diagram of the structure in which a femur is further installed at the acetabulum defect position after the expandable prosthesis suitable for acetabulum defect repair of the present application is implanted.

[0028] Figure 7 Shown is a schematic structural diagram of the prior art in which a prosthesis is pre-implanted into a acetabulum defect.

[0029] Component number description

[0030] 1 Regional prosthesis

[0031] 11 Iliac expansion prosthesis

[0032] 12 Sciatic expansion prosthesis

[0033] 13 Pubic expansion prosthesis

[0034] 2 Auxiliary expansion part

[0035] 3 Sliding components

[0036] 31 Slide rail

[0037] 32 Sliders

[0038] 4 Acetabular prosthesis

[0039] 41 Retaining parts

[0040] 5. First accommodating chamber

[0041] 51 First tank

[0042] 6 Second accommodating chamber

[0043] 61 Second tank

[0044] 7 The third accommodating chamber

[0045] 71 Retention holes

[0046] 8 Limit block

[0047] 9 Limiting chute

[0048] 10. Spacer

[0049] 100 Pelvis

[0050] 110 Femoral head

[0051] 111 Femoral stem DETAILED DESCRIPTION

[0052] like Figure 1 In a first aspect, the present application provides a method for constructing an expandable prosthesis model suitable for repairing acetabulum defects, comprising:

[0053] S1: Acquire three-dimensional scanning data of a 3D printed pelvis filled with an expansion body, and separate a model of the expansion body, wherein the 3D printed pelvis includes an acetabulum defect area; the expansion body is formed by inflating an inflatable elastic body in the acetabulum defect area, and the expansion body has multiple contact points with the acetabulum defect area;

[0054] S2: dividing the outer contour of the model of the expansion body into a plurality of contact areas, with interval areas between adjacent contact areas, respectively constructing contact surfaces based on the contour surfaces of the contact areas; and respectively extending the contact surfaces toward the center direction of the model of the expansion body to form regional modules;

[0055] S3: constructing sliding components for slidingly connecting the adjacent regional modules;

[0056] S4: constructing an auxiliary expansion module for expanding each of the regional modules, wherein the auxiliary expansion module is suitable for expanding each of the regional modules to form an expandable prosthesis model, and the outer contour of the expandable prosthesis model matches the outer contour of the model of the expansion body.

[0057] The method for constructing an expandable prosthesis model suitable for repairing acetabular defects provided in the present application may include: providing a 3D printed pelvis, wherein the 3D printed pelvis is formed based on a 3D scan and 3D reconstruction of the patient's pelvic region. More specifically:

[0058] 1) First, perform a three-dimensional scan on the patient's pelvic area to obtain DICOM or JPEG data. The three-dimensional scanning device may be, for example, a CT machine.

[0059] 2) Use software to perform three-dimensional reconstruction of the scanned pelvis data. The software may be three-dimensional reconstruction software such as medraw and mimics.

[0060] 3) Printing a reconstructed patient pelvic area model by a 3D printer, the 3D printer may be, for example, iSLA1900D. The irregular defect area of ​​the printed patient pelvic three-dimensional model is partitioned, the acetabulum defect area includes the ilium area, the pubic area and the sciatic area. The ilium area, the pubic area and the sciatic area enclose the basic form of the acetabulum defect area. The acetabulum defect area also includes an entrance, which is elliptical. The entrance is the opening formed by grinding the acetabulum. The diameter of the entrance is 50 to 55 mm.

[0061] In the construction method of the expandable prosthesis model suitable for acetabular defect repair provided by the present application, an inflatable elastomer is inflated in the acetabular defect area to form an expandable body, and the expandable body has multiple contact points with the acetabular defect area. In some embodiments, the inflatable elastomer can be, for example, a balloon. The balloon is introduced from the entrance of the acetabular defect area, and after being inflated, multiple contact points are gradually generated with the acetabular defect area. These contact points can be distributed in the three areas of the iliac region, the pubic region, and the sciatic region, and then the expansion is stopped. In some embodiments, the number of contact points can be, for example, 3 to N, and N can be countless. More specifically, the iliac region, the pubic region, and the sciatic region each have at least one contact point with the expandable body.

[0062] In the method for constructing an expandable prosthesis model suitable for acetabular defect repair provided in the present application, the 3D printed pelvis and the expansion body are three-dimensionally scanned together, and the model of the expansion body is separated by software. Among them, the scanning instrument can be a Creaform three-dimensional scanner. The software can be Medraw. Normally, when the inflatable elastomer is expanded in the acetabular defect area of ​​the 3D printed pelvis, since the diameter of the acetabular defect area is usually smaller than the diameter inside the acetabular defect area, the expansion body cannot be taken out from the acetabular defect area of ​​the 3D printed pelvis, so it is necessary to perform a three-dimensional scan as a whole, and after scanning, the model of the 3D printed pelvis and the model of the expansion body located in the acetabular defect area of ​​the 3D printed pelvis model are obtained; the model of the 3D printed pelvis can be separated or removed by software, so as to separate the model of the expansion body.

[0063] In the construction method of the expansion prosthesis model suitable for acetabular defect repair provided by the present application, the outer contour of the model of the expansion body is divided into multiple contact areas, and there is a spacing area between adjacent contact areas, and the width of the spacing area can be, for example, 5mm to 10mm. In some embodiments, the width of the spacing area can be, for example, 5mm to 8mm, 8mm to 10mm, 5mm to 6mm, 6mm to 7mm, 7mm to 8mm, 8mm to 9mm, or 9mm to 10mm. Based on the contour surface of each contact area, the contact surface is constructed respectively; based on each contact surface, a certain distance is extended toward the center direction of the model of the expansion body to form a regional module respectively. Under normal circumstances, the extension distance can be, for example, 5 to 70mm. By 3D printing each regional module to form multiple regional prosthesis parts 1, multiple regional prosthesis parts 1 are matched with the acetabular defect area, specifically, multiple regional prosthesis parts 1 are fitted with the acetabular defect area or have 3 to N contact points, and the contact points are used to determine the position of each regional prosthesis part 1 specifically fixed in the acetabular defect area.

[0064] In some embodiments, the contact surfaces are respectively an ilium contact surface, a sciatic contact surface, and a pubic contact surface. Based on the ilium contact surface, the sciatic contact surface, and the pubic contact surface, they are respectively extended toward the center direction of the model of the expansion body to form an ilium expansion area module, a sciatic expansion area module, and a pubic expansion area module respectively. The ilium expansion area module, the sciatic expansion area module, and the pubic expansion area module are 3D printed to form an ilium expansion prosthesis portion 11, a sciatic expansion prosthesis portion 12, and a pubic expansion prosthesis portion 13 respectively. The ilium expansion prosthesis portion 11 includes an ilium area contact portion, which is a portion intended to contact the actual ilium area of ​​the patient. The sciatic expansion prosthesis portion 12 includes a sciatic area contact portion, which is a portion intended to contact the actual sciatic area of ​​the patient. The pubic expansion prosthesis portion 13 includes a pubic area contact portion, which is a surface intended to contact the actual pubic area of ​​the patient. Among them,

[0065] In a specific embodiment, usually, when applied, the iliac contact surface is 3D printed to form an iliac region contact portion, which may have one or more contact points with the iliac region. In some cases, according to the actual situation of the patient, the iliac region contact portion may be basically in contact with the iliac region. Therefore, in this case, the iliac region contact portion may have an infinite number of contact points with the iliac region. Usually, the number of contact points between the iliac region contact portion and the iliac region is mainly caused by the irregular defect shape. In specific applications, the iliac expandable prosthesis 11 can be fixed to the iliac region through the iliac region contact portion at the contact point. The fixing method may be, for example, nut screw fixing.

[0066] In another specific embodiment, usually, when applied, the sciatic contact surface is 3D printed to form the sciatic region contact part, which may have one or more contact points with the sciatic bone. In some cases, according to the actual situation of the patient, the sciatic contact surface may be substantially fitted with the sciatic region. Therefore, in this case, the sciatic region contact part may have an infinite number of contact points with the sciatic region. Usually, the number of contact points between the sciatic region contact part and the sciatic region is mainly caused by the irregular defect shape. When applied specifically, the sciatic expansion prosthesis part 12 may be fixed to the sciatic region through the sciatic region contact part at the contact points. The fixing method may be, for example, nut screw fixing.

[0067] In another specific embodiment, usually, when applied, the pubic contact surface is 3D printed to form a pubic area contact portion, which may have one or more contact points with the pubic bone. In some cases, according to the actual situation of the patient, the pubic area contact portion may be substantially fitted with the pubic area. Therefore, in this case, the pubic area contact portion may have an infinite number of contact points with the pubic area. Usually, the number of contact points between the pubic area contact portion and the pubic area is mainly caused by the irregular defect shape. When applied specifically, the pubic expansion prosthesis portion 13 may be fixed to the pubic area through the pubic area contact portion at the contact point. The fixing method may be, for example, nut screw fixing.

[0068] In some embodiments, each regional module can be contracted and assembled in the initial state, and the assembled shape is generally elliptical, and the assembled shape is also called the initial expansion prosthesis model, and the size of the initial prosthesis model matches the size of the entrance of the acetabular defect area. Matching here specifically means that the size of the assembled initial expansion prosthesis model is equal to or slightly smaller than the size of the entrance, so that the initial prosthesis model can smoothly pass through the entrance of the acetabular defect area, and further open each regional module through the auxiliary expansion module. The diameter of the initial prosthesis model can be 40-50mm, 50-60mm, 40-45mm, 45-50mm, 50-55mm, or 55-60mm, etc. The diameter of the expansion prosthesis model can be 100-110mm, 110-120mm, 100-105mm, 105-110mm, 110-115mm, or 115-120mm, etc.

[0069] In a specific embodiment, the ilium expansion area module, the sciatic expansion area module and the pubic expansion area module have the same shape and can be assembled into an initial expansion prosthesis model. After 3D printing, the initial expansion prosthesis model is an initial expansion prosthesis. Figure 3 , the ilium expansion prosthesis 11, the sciatic expansion prosthesis 12 and the pubic expansion prosthesis 13 can be assembled to the initial state by the sliding assembly 3 to form an initial expansion prosthesis, and the diameter of the initial expansion prosthesis can be, for example, 40 to 50 mm. At this time, there is no spacer 10 between the ilium expansion prosthesis 11, the sciatic expansion prosthesis 12 and the pubic expansion prosthesis 13, or the spacing between the spacers 10 is very small. In the initial state, the initial expansion prosthesis can smoothly pass through the entrance of the acetabulum defect area, that is, the size of the initial expansion prosthesis matches the size of the entrance area of ​​the acetabulum defect area. In one embodiment, the width of each of the spacers 10 is 5 mm to 10 mm. In some embodiments, the width of the spacer 10 can be, for example, 5 mm to 8 mm, 8 mm to 10 mm, 5 mm to 6 mm, 6 mm to 7 mm, 7 mm to 8 mm, 8 mm to 9 mm, or 9 mm to 10 mm.

[0070] In the construction method of the expandable prosthesis model suitable for acetabular defect repair provided by the present application, an auxiliary expansion module for expanding each of the regional modules is constructed. Generally, the constructed auxiliary expansion module can usually be a cylinder. The diameter of the auxiliary expansion module gradually increases from small to large. Specifically, when used, the auxiliary expansion module is suitable for gradually increasing the diameter of the entrance area facing the acetabular defect area. In this way, the diameter of the auxiliary expansion module that initially enters each regional module is small, and then the diameter gradually increases. When used, each regional module can be smoothly expanded, so that each regional module expands to a suitable position to generate a number of contact points with the actual acetabular defect area of ​​the pelvis, and then the position of the contact points is used to fix each regional module to the actual acetabular defect area of ​​the pelvis. The auxiliary expansion part 2 is formed by 3D printing the auxiliary expansion module. Figure 2 The auxiliary expansion part 2 is a column, and the diameter of the auxiliary expansion part 2 gradually increases from small to large. Specifically, when used, the auxiliary expansion part 2 is suitable for gradually increasing the diameter of the entrance area toward the acetabular defect area. In this way, the diameter of the auxiliary expansion part 2 that initially enters the prosthetic part 1 of each region is small, and then the diameter gradually increases. When used, the prosthetic part 1 of each region can be smoothly expanded, so that the prosthetic part 1 of each region expands to a suitable position to generate several contact points with the actual acetabular defect area of ​​the pelvis, and then the position of the contact points is used to fix each regional module at the actual acetabular defect area of ​​the pelvis 100.

[0071] In the construction method of the expandable prosthesis model suitable for acetabular defect repair provided by the present application, a first slot module that cooperates with the auxiliary support module is constructed based on each regional module. Each of the first slot modules can be combined to form a first accommodating module for accommodating the auxiliary support module. In a specific embodiment, taking the example of each regional module including an ilium expansion region module, a sciatic expansion region module and a pubic expansion region module, the ilium expansion region module, the sciatic expansion region module and the pubic expansion region module respectively include a first slot module, and when the ilium expansion region module, the sciatic expansion region module and the pubic expansion region module are assembled, each of the first slot modules can be enclosed to form a cylindrical cavity, and the diameter of the cylindrical cavity matches the minimum diameter of the auxiliary support module. When the ilium expansion region module, the sciatic expansion region module and the pubic expansion region module are expanded by the auxiliary support module, there are intervals between each of the first slot modules, and the space enclosed by each of the first slot modules and the intervals matches the shape of the auxiliary support module, so that the auxiliary support module can be well accommodated. The first slot is formed by corresponding 3D printing of the first slot module. As Figure 2, each of the regional prosthesis parts 1 is provided with a first slot body 51 matched with the auxiliary expansion part 2, and each of the first slot bodies 51 can be combined to form a first accommodating cavity 5 for accommodating the auxiliary support part. In a specific embodiment, taking the regional prosthesis part 1 including the ilium expansion prosthesis part 11, the sciatic expansion prosthesis part 12 and the pubic expansion prosthesis part 13 as an example, the ilium expansion prosthesis part 11, the sciatic expansion prosthesis part 12 and the pubic expansion prosthesis part 13 respectively include the first slot body 51, when the ilium expansion prosthesis part 11, the sciatic expansion prosthesis part 12 and the pubic expansion prosthesis part 13 are assembled, as shown in FIG. Figure 3 , each of the first grooves 51 can enclose a cylindrical accommodation cavity, and the diameter of the cylindrical cavity matches the minimum diameter of the auxiliary expansion part 2. When the ilium expandable prosthesis part 11, the sciatic expandable prosthesis part 12 and the pubic expandable prosthesis part 13 are expanded by the auxiliary support part, there are intervals between each of the first grooves 51, and the space enclosed by each of the first grooves 51 and the intervals matches the shape of the auxiliary support part, so that the auxiliary support part can be well accommodated.

[0072] In the construction method of the expansion prosthesis model suitable for acetabular defect repair provided by the present application, a sliding assembly is constructed for slidingly connecting each adjacent regional module. Generally, the sliding assembly includes a slide rail module and a slider module, wherein the specific construction steps of the slide rail module and the slider module are as follows: construct the slide rail module in the sliding assembly on each regional module, and construct a slider module that matches the slider module. Specifically, for example, the slide rail module can be constructed on the ilium expansion regional module, the sciatic expansion regional module and the pubic expansion regional module, respectively. The slide rail module is an arc-shaped slide rail, and a slider module that matches the slide rail module is constructed. The slider module can be, for example, a slider module that matches the arc-shaped slide rail, and the size of the slider module is equal to or slightly smaller than the size of the slide rail module. And the slider module is between two adjacent slide rail modules. For example, when the auxiliary opening module opens each regional module, the slider module slides in the two slide rail modules, so that the adjacent regional modules move in opposite directions, so that the two adjacent regional modules expand to contact the acetabular defect area. A limiting block module for limiting the movement position of the slider module is constructed on the slider module; a limiting slot module that cooperates with the limiting block module is constructed on each contact surface, and the limiting block module can slide along the limiting slot module. In order to ensure that each regional module will not detach when expanded to the maximum, a limiting block module is constructed on the slider, and a limiting slot module that cooperates with the limiting block module is constructed on the contact surface of the regional module. In some embodiments, the arc length of the slide rail module can be πmm~10πmm. The arc length of the slider module can be, for example, 2πmm~20πmm, 2πmm~10πmm, 10πmm~20πmm, 2πmm~4πmm, 4πmm~8πmm, 8πmm~10πmm, 10πmm~12πmm, 12πmm~14πmm, 14πmm~16πmm, 16πmm~18πmm, or 18πmm~20πmm, etc. The arc length of the limit slide module is πmm~10πmm, πmm~5πmm, 5πmm~10πmm, πmm~2πmm, 2πmm~3πmm, 3πmm~4πmm, 4πmm~5πmm, 5πmm~6πmm, 6πmm~7πmm, 7πmm~8πmm, 8πmm~9πmm, or 9πmm~10πmm, etc. The height of the limit block module is 20~50mm, 20~30mm, 30~40mm, or 40~50mm, etc.

[0073] The slide rail module and the slider module are 3D printed to form the slide rail 31 and the slider 32. Figure 2, the sliding assembly 3 includes a slide rail 31 provided on each of the regional prosthesis parts 1 and a slider 32 that can slide along the adjacent slide rail 31. For example, the slide rails 31 can be provided on the ilium expansion prosthesis part 11, the sciatic expansion prosthesis part 12 and the pubic expansion prosthesis part 13, respectively. The slide rail 31 is an arcuate slide rail 31, and the slider 32 can be, for example, a slider 32 that cooperates with the arcuate slide rail 31, and the size of the slider 32 is larger than the size of the slide rail 31. And the slider 32 is between two adjacent slide rails 31. For example, when the auxiliary expansion part 2 expands each regional module, the slider 32 slides in the two slide rails 31, so that the adjacent regional modules move in opposite directions, so that the two adjacent regional prosthesis parts 1 expand to contact the acetabular defect area. In some embodiments, the arc length of the slide rail can be πmm~10πmm. The arc length of the slider can be, for example, 2πmm~20πmm.

[0074] The limiting slider module is 3D printed to form a limiting slider 32, and the limiting slider 32 is used to limit the sliding position of the slider 32. The limiting slot module is 3D printed to form a limiting slot 9, and the limiting block 8 cooperates with the limiting slot 9. The limiting block 8 can slide along the limiting slot 9. In order to ensure that the prosthesis 1 in each area will not detach when expanded to the maximum, the limiting block 8 is set on the slider 32, which can limit the position of the limiting block 8 and further limit the movement of the slider 32. In some embodiments, the arc length of the limiting slot is πmm~10πmm. The height of the limiting block is 20~50mm.

[0075] In the method for constructing an expandable prosthesis model suitable for acetabular defect repair provided in the present application, an acetabular cup module is constructed for connecting an auxiliary distraction module; a second slot body module is constructed based on the respective regional modules, and each of the second slot body modules can be combined to form a second accommodating module for accommodating part of the acetabular cup module.

[0076] In a specific embodiment, the acetabular cup module is connected to the auxiliary expansion module, wherein the auxiliary expansion module further constructs a third accommodation module that matches the bottom of the acetabular cup module, and accommodates part of the bottom of the acetabular cup module therein, and then fixes it, for example, by screws. Since the diameter of the opening of the acetabular cup module is larger than the diameter of the auxiliary expansion module, part of the acetabular cup module needs to be accommodated by the second accommodation module. That is, a part of the acetabular cup module is accommodated in the third accommodation module, and then the acetabular cup module not accommodated by the third accommodation module is accommodated in the second accommodation module.

[0077] The acetabular cup module, the second slot body module, the second receiving module, and the third receiving module are 3D printed to form the acetabular cup prosthesis 4, the second slot body 61, the second receiving cavity 6, and the third receiving cavity 7, respectively. Figure 2, the acetabular cup prosthesis 4 is connected to the auxiliary support part 2; the prosthesis part 1 in each region is respectively provided with a second groove body 61 matched with the acetabular cup, and each of the second groove bodies 61 can be combined to form a second accommodating cavity 6 for accommodating part of the acetabular cup prosthesis 4. The acetabular cup prosthesis 4 is connected to the auxiliary support part 2, wherein the auxiliary support part 2 is provided with a third accommodating cavity 7 for accommodating the remaining acetabular cup prosthesis 4, which is matched with the bottom of the acetabular cup prosthesis 4, and part of the bottom of the acetabular cup prosthesis 4 is accommodated in the third accommodating cavity 7, and then fixed. In a specific embodiment, the third accommodating cavity 7 is provided with a retaining hole 71, and the bottom of the acetabular cup prosthesis 4 is provided with a retaining member 41 matched with the retaining hole. For example, it can be fixed by a screw. Since the diameter of the opening of the acetabular cup prosthesis 4 is greater than the diameter of the auxiliary support part 2, part of the acetabular cup prosthesis 4 needs to be accommodated by the second accommodating cavity 6. The acetabular cup prosthesis 4 can be further connected to the femoral head 110 and the femoral stem 111, and the rotatable center position is guaranteed to be accurate.

[0078] The construction method of the expandable prosthesis model suitable for acetabular defect repair of the present invention can obtain the shape of an ideal expansion model based on the model of the expansion body, and the contact point of the inflatable elastomer in the irregular area after inflation is also the force point of the model with the irregular area after expansion. And based on the model of the expansion body, multiple areas are divided, and then multiple regional modules are constructed. When the modules of each area are close together and concentrated, they can smoothly pass through the small-caliber entrance of the acetabular defect area. After entering, the modules of each area can be expanded by the auxiliary expansion module to achieve the expansion state, that is, the expansion prosthesis model of the present invention, and the outer contour of the expansion prosthesis model matches the outer contour of the expansion body model. The 3 to N spatial fixed points or fixed area positions generated by the interface between the prosthesis and the acetabular bone defect in the expansion model are fixed, and the modularization of the prosthesis corresponds to the modularization of the bone defect to solve the problem that the existing prosthesis design shape cannot perfectly match the irregular defect area of ​​the patient, and the design of the modular expansion model solves the problem that the existing prosthesis cannot be implanted during the actual surgical implantation process due to the influence of protruding bone, osteophytes, etc.

[0079] The second aspect of the present invention provides a device for constructing an expandable prosthesis model suitable for repairing acetabulum defects, comprising:

[0080] An expansion body model acquisition unit is used to acquire three-dimensional scanning data of a 3D printed pelvis filled with an expansion body, and separate a model of the expansion body, wherein the 3D printed pelvis includes an acetabulum defect area; the expansion body is formed by inflating an inflatable elastic body in the acetabulum defect area, and the expansion body has a plurality of contact points with the acetabulum defect area;

[0081] A regional module construction unit is used to divide the outer contour of the model of the expansion body into a plurality of contact areas, with interval areas between adjacent contact areas, and to construct contact surfaces based on the contour surfaces of the contact areas; and to extend the contact surfaces toward the center direction of the model of the expansion body to form regional modules respectively;

[0082] A sliding assembly construction unit, used to construct a sliding assembly for slidingly connecting adjacent regional modules;

[0083] The auxiliary expansion module construction unit is used to construct an auxiliary expansion module for expanding each of the regional modules, wherein the auxiliary expansion module is suitable for expanding each of the regional modules to form an expandable prosthesis model, and the outer contour of the expandable prosthesis model matches the outer contour of the expansion body model.

[0084] In the device for constructing an expandable prosthesis model suitable for repairing acetabulum defects provided by the present invention, the 3D printed pelvis is formed based on three-dimensional scanning and three-dimensional reconstruction of the patient's pelvic area. More specifically:

[0085] 1) First, perform a three-dimensional scan on the patient's pelvic area to obtain DICOM or JPEG data. The three-dimensional scanning device may be, for example, a CT machine.

[0086] 2) Use software to perform three-dimensional reconstruction of the scanned pelvis data. The software may be three-dimensional reconstruction software such as medraw and mimics.

[0087] 3) Printing a reconstructed patient pelvic area model by a 3D printer, the 3D printer may be, for example, iSLA1900D. The irregular defect area of ​​the printed patient pelvic three-dimensional model is partitioned, the acetabulum defect area includes the ilium area, the pubic area and the sciatic area. The ilium area, the pubic area and the sciatic area enclose the basic form of the acetabulum defect area. The acetabulum defect area also includes an entrance, which is elliptical. The entrance is the opening formed by grinding the acetabulum. The diameter of the entrance is 50 to 55 mm.

[0088] In the construction device of the expandable prosthesis model suitable for acetabular defect repair provided by the present invention, the expandable body is formed by inflating an inflatable elastomer in the acetabular defect area, and the expandable body has multiple contact points with the acetabular defect area. In some embodiments, the inflatable elastomer can be, for example, a balloon. The balloon enters from the entrance of the acetabular defect area, and after being inflated, it gradually produces multiple contact points with the acetabular defect area. These contact points can be distributed in the three areas of the iliac region, the pubic region, and the sciatic region, and then stop expanding. In some embodiments, the number of contact points can be, for example, 3 to N, and N can be countless. More specifically, the iliac region, the pubic region, and the sciatic region each have at least one contact point with the expandable body.

[0089] In the device for constructing an expandable prosthesis model suitable for acetabular defect repair provided by the present invention, the model of the expandable body is obtained by three-dimensionally scanning the 3D printed pelvis and the expandable body together, and separating them through software. Among them, the scanning instrument can be a Creaform three-dimensional scanner. The software can be Medraw. Normally, when the inflatable elastomer is expanded in the acetabular defect area of ​​the 3D printed pelvis, since the diameter of the acetabular defect area is usually smaller than the diameter inside the acetabular defect area, the expandable body cannot be taken out from the acetabular defect area of ​​the 3D printed pelvis, so it is necessary to perform three-dimensional scanning as a whole, and obtain the model of the 3D printed pelvis and the model of the expandable body located in the acetabular defect area of ​​the 3D printed pelvis model after scanning; the model of the 3D printed pelvis can be separated or removed by software, so as to separate the model of the expandable body.

[0090] In the device for constructing an expandable prosthesis model suitable for repairing acetabulum defects provided by the present invention, the outer contour of the model of the expandable body is divided into a plurality of contact areas, and there is a spacing area between adjacent contact areas, and the width of the spacing area can be, for example, 5mm to 10mm. In some embodiments, the width of the spacing area can be, for example, 5mm to 8mm, 8mm to 10mm, 5mm to 6mm, 6mm to 7mm, 7mm to 8mm, 8mm to 9mm, or 9mm to 10mm, etc. Contact surfaces are constructed based on the contour surfaces of each of the contact areas; and regional modules are formed respectively based on each of the contact surfaces extending a certain distance toward the center direction of the model of the expandable body. Normally, the extension distance can be, for example, 5 to 70mm.

[0091] In the construction device of the expandable prosthesis model suitable for acetabulum defect repair provided by the present invention, the iliac expansion area module construction unit is formed based on the extension of the iliac contact surface toward the center direction of the model of the expansion body.

[0092] The ischium expansion region module building unit is formed based on the ischium contact surface extending toward the center direction of the model of the expansion body.

[0093] The pubic expansion area module construction unit is formed based on the pubic contact surface extending toward the center direction of the model of the expansion body.

[0094] In some embodiments, each regional module construction unit can be shrunk and assembled in the initial state, and the assembled shape is generally elliptical, and the assembled shape is also called an initial expansion prosthesis model, and the size of the initial prosthesis model matches the size of the entrance of the acetabular defect area. Matching here specifically means that the size of the assembled initial expansion prosthesis model is equal to or slightly smaller than the size of the entrance, so that the initial prosthesis model can smoothly pass through the entrance of the acetabular defect area, and further open each regional module through the auxiliary expansion module.

[0095] In a specific embodiment, the ilium expansion region module building unit, the sciatic expansion region module building unit and the pubic expansion region module building unit have the same shape and can be assembled into an initial expansion prosthesis model building unit.

[0096] The auxiliary expansion module construction unit is a columnar structure, and the diameter of the auxiliary expansion module gradually increases from one end to the other. Specifically, when used, the auxiliary expansion module is suitable for gradually increasing the diameter of the entrance area toward the acetabular defect area. In this way, the diameter of the auxiliary expansion module initially entering each regional module is small, and then the diameter gradually increases. When used, each regional module can be smoothly expanded, so that each regional module expands to a suitable position and generates several contact points with the actual acetabular defect area of ​​the pelvis, and then each regional module is fixed to the actual acetabular defect area of ​​the pelvis through the position of the contact point.

[0097] The first slot body slider construction unit is used to construct a first slot body module that matches the auxiliary expansion module based on each regional module. Each of the first slot body modules can be combined to form a first accommodating module for accommodating the auxiliary expansion module. In a specific embodiment, taking each regional module including an ilium expansion regional module, a sciatic expansion regional module and a pubic expansion regional module as an example, the ilium expansion regional module, the sciatic expansion regional module and the pubic expansion regional module respectively include a first slot body module. When the ilium expansion regional module, the sciatic expansion regional module and the pubic expansion regional module are assembled, each of the first slot body modules can be enclosed to form a cylindrical cavity, and the diameter of the cylindrical cavity matches the minimum diameter of the auxiliary expansion module. When the ilium expansion regional module, the sciatic expansion regional module and the pubic expansion regional module are expanded by the auxiliary support module, there is a gap between each of the first slot body modules, and the space enclosed by each of the first slot body modules and the gap matches the shape of the auxiliary support module, so that the auxiliary support module can be well accommodated.

[0098] The sliding assembly construction unit is used to respectively construct sliding assemblies for slidingly connecting the adjacent area modules. Usually, the sliding assembly includes a slide rail module and a slider module.

[0099] The slide rail module construction unit is used to construct the slide rail modules in the sliding assembly on each area module.

[0100] The slider module construction unit is used to construct a slider module that matches the slider module. Specifically, for example, it can be used to construct a slide rail module on the ilium expansion area module, the ischium expansion area module and the pubic expansion area module, respectively. The slide rail module is an arc-shaped slide rail, and a slider module that matches the slide rail module is constructed. The slider module can be, for example, a slider module that matches the arc-shaped slide rail, and the size of the slider module is equal to or slightly smaller than the size of the slide rail module. And the slider module is between two adjacent slide rail modules. For example, when the auxiliary expansion module expands each area module, the slider module slides in the two slide rail modules, so that the adjacent area modules move in opposite directions, so that the two adjacent area modules expand to contact the acetabulum defect area.

[0101] The limiting block module construction unit is used to construct a limiting block module on the slider module for limiting the movement position of the slider module.

[0102] The limit slide module construction unit is used to construct a limit slide module on each contact surface to match the limit block module. The limit block module can slide along the limit slide module. In order to ensure that each area module will not be separated when expanded to the maximum, a limit block module is constructed on the slider, and a limit groove module that matches the limit block module is constructed on the contact surface of the area module.

[0103] In some embodiments, the arc length of the slide rail module can be πmm~10πmm. The arc length of the slider module can be, for example, 2πmm~20πmm, 2πmm~10πmm, 10πmm~20πmm, 2πmm~4πmm, 4πmm~8πmm, 8πmm~10πmm, 10πmm~12πmm, 12πmm~14πmm, 14πmm~16πmm, 16πmm~18πmm, or 18πmm~20πmm. The arc length of the limit slide slot module is πmm~10πmm, πmm~5πmm, 5πmm~10πmm, πmm~2πmm, 2πmm~3πmm, 3πmm~4πmm, 4πmm~5πmm, 5πmm~6πmm, 6πmm~7πmm, 7πmm~8πmm, 8πmm~9πmm, or 9πmm~10πmm. The height of the limit block module is 20-50 mm, 20-30 mm, 30-40 mm, or 40-50 mm.

[0104] The acetabular cup module construction unit is used to construct the acetabular cup module connected to the auxiliary distraction module.

[0105] The second tank module construction unit is used to construct a second tank module based on the regional modules.

[0106] The second accommodation module construction unit is used to construct a second accommodation module based on the second slot modules that can be combined to form an accommodation part of the acetabular cup module.

[0107] The third accommodating module is used to further construct a third accommodating module in the auxiliary support module to match the bottom of the acetabular cup module. Part of the bottom of the acetabular cup module is accommodated in the third accommodating module and then fixed, for example, by screws. Since the diameter of the opening of the acetabular cup module is larger than the diameter of the auxiliary support module, part of the acetabular cup module needs to be accommodated by the second accommodating module. That is, a part of the acetabular cup module is accommodated in the third accommodating module, and then the acetabular cup module not accommodated by the third accommodating module is accommodated in the second accommodating module.

[0108] The expandable prosthesis model of the present invention is constructed by various construction units, and the outer contour of the expandable prosthesis model matches the outer contour of the model of the expandable body. The expansion model is fixed by 3 to N spatial fixed points or fixed areas generated by the interface between the prosthesis and the acetabular bone defect, and the modularization of the prosthesis corresponds to the modularization of the bone defect to solve the problem that the existing prosthesis design form cannot perfectly match the patient's irregular defect area, and the design of the modular expansion model solves the problem that the existing prosthesis cannot be implanted during the actual surgical implantation process due to the influence of protruding bone, osteophytes, etc.

[0109] The third aspect of the present application provides a method for preparing an expandable prosthesis suitable for acetabular defect repair, the method comprising: constructing an expandable prosthesis model suitable for acetabular defect repair according to the method for constructing an expandable prosthesis model suitable for acetabular defect repair provided in the first aspect of the present application, and preparing an expandable prosthesis suitable for acetabular defect repair. The method for preparing an expandable prosthesis suitable for acetabular defect repair according to the model should be known to those skilled in the art, for example, 3D printing and other methods can be used, and generally speaking, the prosthesis can preferably be 3D printed using titanium alloy materials.

[0110] The fourth aspect of the present application provides an expandable prosthesis suitable for acetabular defect repair, which is constructed by the method for constructing an expandable prosthesis model suitable for acetabular defect repair provided by the first aspect of the present application, or prepared by the method for preparing an expandable prosthesis suitable for acetabular defect repair provided by the second aspect of the present application.

[0111] like Figures 2 to 6As shown, an embodiment of the present application provides an expandable prosthesis, including a plurality of regional prosthesis parts 1 suitable for matching with the acetabular defect area, a spacer 10 is provided between adjacent regional prosthesis parts 1, adjacent regional prosthesis parts 1 are connected by a sliding assembly 3, and an auxiliary expansion part 2 for expanding each of the regional prosthesis parts 1 is also included. Among them, the plurality of regional prosthesis parts 1 match with the acetabular defect area, specifically, the plurality of regional prosthesis parts 1 fit with the acetabular defect area or have 3 to N contact points, and the contact points are used to determine the specific fixation position of each regional prosthesis part 1 in the acetabular defect area.

[0112] The specific working process of the expandable prosthesis suitable for repairing acetabulum defects provided by the present invention is as follows:

[0113] like Figure 4 During the operation, the doctor first uses the sliding assembly 3 to combine multiple regional prosthesis parts 1, such as the iliac expansion prosthesis part 11, the sciatic expansion prosthesis part 12 and the pubic expansion prosthesis part 13, into a minimum, namely, an initial expansion prosthesis, and then inserts the initial expansion prosthesis into the acetabulum defect area from the entrance of the acetabulum defect area. Figure 5 , further insert the auxiliary expansion part 2 from the first groove body 51 of the multiple regional prosthesis part 1. As the diameter of the auxiliary expansion part 2 entering becomes larger and larger, the multiple regional prosthesis part 1 can be expanded to contact with the acetabular defect area and produce 3 to N contact points, and expand into the expandable prosthesis of the present invention. Then, after positioning through the contact points, the multiple regional prosthesis parts 1 are fixed to the corresponding acetabular defect areas with fasteners. For example, if it is an iliac expansion prosthesis part 11, it is fixed to the iliac area. If it is a sciatic expansion prosthesis part 12, it is fixed to the sciatic area. If it is a pubic expansion prosthesis part 13, it is fixed to the pubic area. Finally, it is stabilized by cancellous bone. Figure 6 The acetabular cup prosthesis 4 can be further connected to the femoral head 110 and the femoral stem 111 to ensure that the rotatable center position is accurate.

[0114] The expandable prosthesis of the present invention is suitable for repairing acetabulum defects. The expandable prosthesis can be effectively applied to various types of irregular defects in the ilium, pubic bone, and hip bone regions. The design of a modular expansion model solves the problem that existing prostheses cannot be implanted during actual surgical implantation due to protruding bone, osteophytes, etc.

[0115] The fifth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, characterized in that when the program is executed by a processor, the steps of the method for constructing an expandable prosthesis model suitable for acetabular defect repair provided in the first aspect of the present application are implemented.

[0116] The sixth aspect of the present application provides a device, comprising: a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the device performs the steps of the method for constructing an expandable prosthesis model suitable for acetabular defect repair provided in the first aspect of the present application.

[0117] The following describes the implementation of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application.

[0118] Example 1

[0119] 1) First, the patient's pelvic area is three-dimensionally scanned using a CT machine to obtain DICOM or JPEG data;

[0120] 2) Use medraw or mimics software to perform three-dimensional reconstruction of the scanned pelvis data;

[0121] 3) The reconstructed patient pelvic area model is printed out by a 3D printer (iSLA1900D), and the irregular defect area of ​​the printed patient pelvic three-dimensional model is divided into iliac area, pubic area and sciatic area.

[0122] 4) The fixed form of the expansion model in the patient's pelvic area is simulated through experiments. The experimental object is a balloon. In the experiment, the balloon is mainly inserted from the rotatable center (the center of the femoral head) and then inflated. After the balloon is inflated, the three initial contact points in the patient's acetabulum defect area are distributed in the three areas of ilium, pubis, and ischium, and the inflation can be stopped.

[0123] 5) The balloon and its pelvis were 3D scanned using the Creaform scanner, and the inflated balloon was separated using the Medraw software.

[0124] 6) Design the size of the initial expansion model based on the size of the entrance of the acetabulum defect area. The diameter of the entrance of the acetabulum defect area is 54.69 mm. The diameter of the size of the initial expansion model is 52 mm. Divide the initial expansion model into three equal parts, namely, the ilium expansion area module, the sciatic expansion area module, and the pubic expansion area module.

[0125] 7) Reconstruct the expansion model by partitioning the forward modeling according to the shape of the inflated balloon, specifically, divide three contact areas, and there is a spacing area between adjacent contact areas, and the spacing between the spacing areas is 16π. Based on the contour surfaces of the three contact areas, the ilium contact surface, the ischium contact surface and the pubic contact surface are respectively constructed, and the ilium contact surface, the ischium contact surface and the pubic contact surface are respectively extended 24 mm toward the center direction of the model of the inflated body to form an ilium expansion area module, a ischium expansion area module and a pubic expansion area module.

[0126] 8) The ilium expansion area module, the sciatic expansion area module and the pubic expansion area module are connected by sliding rails and slideways, the arc length of the slideway is 8.3πmm, the arc length of the slideway is 16.6πmm, the arc length of the limit slideway is 8.3πmm, and the height of the limiter is 45mm.

[0127] 9) The ilium expansion area module, the sciatic expansion area module and the pubic expansion area module are enclosed to form an initial expansion prosthesis model. The ilium expansion area module, the sciatic expansion area module and the first slot module on the pubic expansion area module are enclosed to form a cylindrical accommodating cavity, and the diameter of the cylindrical accommodating cavity is 20 mm. Construct an auxiliary expansion module, the minimum diameter of the auxiliary expansion module is equal to the diameter of the cylindrical accommodating cavity, and the maximum diameter is 68 mm. The length of the auxiliary expansion module is 110 mm.

[0128] 10) The second slot modules on the ilium expansion area module, the sciatic expansion area module and the pubic expansion area module are combined in three assembled states to form a second receiving module for receiving part of the acetabular cup model.

[0129] 11) Constructing a third accommodation module in the auxiliary distraction module for accommodating the remaining acetabular cup model.

[0130] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0131] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A method for constructing an expandable prosthesis model suitable for repairing acetabulum defects, comprising: Acquiring three-dimensional scanning data of a 3D printed pelvis filled with an expansion body, and separating a model of the expansion body, wherein the 3D printed pelvis includes an acetabulum defect area; The expandable body is formed by inflating an inflatable elastic body in the acetabulum defect area, and the expandable body has multiple contact points with the acetabulum defect area; the acetabulum defect area includes an ilium area, a pubic area, and a sciatic area; the expandable body has one or more contact points with the ilium area, the pubic area, and the sciatic area respectively; Divide the outer contour of the model of the expansion body into a plurality of contact areas, with spacing areas between adjacent contact areas, and construct contact surfaces based on the contour surfaces of the contact areas; and extend the contact surfaces toward the center direction of the model of the expansion body to form regional modules; Constructing sliding assemblies for slidingly connecting adjacent regional modules; Constructing an auxiliary expansion module for expanding each of the regional modules, wherein the auxiliary expansion module is suitable for expanding each of the regional modules to form an expandable prosthesis model, wherein the outer contour of the expandable prosthesis model matches the outer contour of the model of the expansion body; The contact surfaces are respectively an ilium contact surface, a sciatic contact surface and a pubic contact surface; the ilium contact surface, the sciatic contact surface and the pubic contact surface are respectively extended toward the center direction of the model of the expansion body to form an ilium expansion area module, a sciatic expansion area module and a pubic expansion area module respectively; The auxiliary expansion module is constructed, wherein the auxiliary expansion module is a columnar structure, and the diameter of the auxiliary expansion module gradually increases from one end to the other end; A first slot module matching with the auxiliary expansion module is constructed based on each area module, and each of the first slot modules can be combined to form a first accommodating module for accommodating the auxiliary expansion module; Constructing an acetabular cup module for connecting the auxiliary distraction module; constructing a second slot body module based on each of the regional modules, each of the second slot body modules can be combined to form a second accommodating module for accommodating part of the acetabular cup module; Constructing a slide rail module in a sliding assembly on each area module, and constructing a slider module matched with the slide rail module; constructing a limiting block module for limiting the movement position of the slider module on the slider module; constructing a limiting slide groove module matched with the limiting block module on each contact surface; Each of the formed regional modules is suitable for enclosing and forming an initial expansion prosthesis model when not expanded by the auxiliary expansion module; the size of the initial expansion prosthesis model is suitable for matching the size of the entrance area of ​​the acetabulum defect area.

2. The method for constructing an expandable prosthesis model suitable for repairing acetabulum defects according to claim 1, characterized in that: The 3D printed pelvis is formed based on three-dimensional scanning and three-dimensional reconstruction of the patient's pelvic area and then printed.

3. The method for constructing an expandable prosthesis model suitable for repairing acetabulum defects according to claim 1, characterized in that: Constructing a third accommodating module based on the auxiliary distraction module, wherein the third accommodating module is used to accommodate the remaining acetabular cup modules; constructing a retaining hole in the third accommodating module; A retention module matched with the retention hole is constructed at the bottom of the acetabular cup module.

4. A method for preparing an expandable prosthesis suitable for repairing acetabulum defects, the method comprising: An expandable prosthesis model suitable for acetabular defect repair is constructed and obtained according to the method for constructing an expandable prosthesis model suitable for acetabular defect repair as described in any one of claims 1 to 3, and an expandable prosthesis suitable for acetabular defect repair is prepared.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for constructing an expandable prosthesis model suitable for repairing acetabular defects as described in any one of claims 1 to 3 are implemented.

6. A device comprising: A processor and a memory, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory so that the device performs the steps of the method for constructing an expandable prosthesis model suitable for acetabular defect repair as described in any one of claims 1 to 3.

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