CN115230162A - Lightweight implementation method of human wrist external fixation brace based on topology optimization - Google Patents
Lightweight implementation method of human wrist external fixation brace based on topology optimization Download PDFInfo
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- CN115230162A CN115230162A CN202211015032.XA CN202211015032A CN115230162A CN 115230162 A CN115230162 A CN 115230162A CN 202211015032 A CN202211015032 A CN 202211015032A CN 115230162 A CN115230162 A CN 115230162A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
- A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
- A61F5/04—Devices for stretching or reducing fractured limbs; Devices for distractions; Splints
- A61F5/05—Devices for stretching or reducing fractured limbs; Devices for distractions; Splints for immobilising
- A61F5/058—Splints
- A61F5/05841—Splints for the limbs
- A61F5/05858—Splints for the limbs for the arms
- A61F5/05866—Splints for the limbs for the arms for wrists, hands, fingers or thumbs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
Abstract
The invention discloses a lightweight realization method of a human wrist external fixation brace based on topology optimization, which comprises the following steps of (1) scanning object limbs to obtain related point cloud data; (2) Carrying out noise processing on point cloud data acquired by scanning object limbs; (3) Packaging and surface modifying the processed point cloud data; (4) Importing the processed packaging data into computer aided design software for reverse modeling; (5) Converting the modeled model into a shell-shaped solid model, and performing shell extraction lightening design; (6) Importing the processed model into finite element analysis software for finite element analysis; the invention realizes the optimized design and manufacture of the personalized human body external fixing brace by combining the 3D printing technology, not only can ensure the external fixing treatment effect of the brace and reduce the weight, but also can ensure the strength of the brace in use, more obviously improves the wearing comfort and the air permeability of the brace, and can effectively reduce the medical cost.
Description
Technical Field
The invention relates to the technical field of personalized limb orthopedic rehabilitation medical instruments, in particular to a light weight implementation method of a human wrist external fixation brace based on topology optimization.
Background
Clinically, congenital malformation of bone joints of four limbs and vertebral column development is often found in children and young people, and the etiology and morphological manifestations of the congenital malformation are complex and changeable, so that the congenital malformation has the characteristic of high individuation. In addition to this, sequelae of traumatic or neurological injury often lead to secondary anatomical morphological changes in the limb, pathological features also having significant patient individualization characteristics. If the congenital and acquired abnormal limb morphology cannot be corrected and treated timely and regularly, the permanent and irreversible pathological changes of the limb and the trunk part can be caused, so that the bearing and the movement function disability of the limb can be influenced, and the serious burden can be brought to families and society.
The traditional orthopedic treatment of limb deformity by using the external fixation brace of the human body is considered as the most effective early intervention means, and obtains encouraging effect in diseases such as congenital spine deformity, equinovarus, congenital hip dysplasia and the like. Nevertheless, the conventional braces still have various problems in practical clinical application: the traditional brace has long manufacturing time, and the manufacturing process has higher technical requirements on mold taking, measurement, forming and the like, so that the orthopedic treatment process of a patient is delayed; the labor cost of the traditional brace occupies most proportion, the automation degree is low, and the manual preparation fineness and the matching degree of personnel are often difficult to satisfy in the aspect of the wearing effect; moreover, the material of selecting is comparatively fixed in the preparation of brace, and traditional material has the kind singleness, and the intensity characteristic is difficult to and complicated orthopedic demand absolute matching, and gas permeability and the travelling comfort are relatively poor scheduling problem. The above problems and factors result in the adherence of patients, especially adolescent children patients, to wear, which greatly affects the ultimate effect of orthopedic limb treatment.
In this case, the topology optimization design of the personalized human external fixation orthopedic brace based on 3D printing is the best solution to the above-mentioned problems at present. The personalized brace has great application advantages for limb orthopedic patients: 1. the personalized customized brace based on the biomedical engineering technology can realize highly automatic, intelligent and precise manufacturing of the brace design process, and effectively achieve the accuracy and matching degree which are difficult to meet in artificial manufacturing; 2. the butt joint 3D printing forming process can realize the selection of different materials, and the materials with different performances can meet different orthopedic treatment requirements; 3. the additive manufacturing technology can greatly reduce the manufacturing cost of the brace, improve the timeliness of the brace for clinical use, improve the orthopedic treatment effect of the brace and greatly reduce the economic burden of a patient. However, how to realize the personalized human body external fixation orthopedic brace which is more in accordance with the human body design, the structural strength optimization design and the clinical applicability design is a key link for improving the clinical limb orthopedic treatment effect at present.
Therefore, aiming at the defects in the prior art, it is necessary to provide a lightweight solution for the external fixing brace for the wrist of the human body based on topology optimization to solve the defects in the prior art.
Disclosure of Invention
The technical problem to be solved by the invention is a light weight realization method of a human wrist external fixation brace based on topology optimization, which can effectively solve the defects in the prior art.
The invention is realized by the following technical scheme: a lightweight realization method of a human wrist external fixation brace based on topology optimization comprises the following steps:
step 1.1, scanning the object limb to obtain related point cloud data;
step 1.2, carrying out noise point processing on point cloud data acquired by scanning object limbs;
step 1.3, packaging and surface modification treatment are carried out on the processed point cloud data;
step 1.4, importing the processed packaging data into computer aided design software for reverse modeling;
step 1.5, converting the modeled model into a shell-shaped solid model, and carrying out shell extraction lightening design;
step 1.6, carrying out finite element analysis on the processed model;
step 1.7, carrying out lightweight design through finite element analysis software, and carrying out optimization design iterative operation based on a sensitive algorithm;
step 1.8, outputting the STL model of the design result to design software for re-designing of the final brace and obtaining a brace model after optimized design;
and 1.9, obtaining the personalized human body external fixing brace by using 3D printing.
As a preferred technical scheme, step 2.1, scanning the surface of the object limb to obtain all point cloud data related to the limb, asc;
step 2.2, importing the point cloud data obtained in the step 2.1 into Jie's engineering design software for noise point treatment;
step 2.3, the point cloud data processed in the step 2.2 is processed by packaging, surface modification and the like, and stored in a stl format;
step 2.4, importing the packaged point cloud data processed in the step 2.3 into reverse engineering GeomagicDesignX software or computer aided design software for reverse modeling processing;
step 2.5, performing shell-extraction lightening design on the model processed in the step 2.4 through reverse modeling to obtain a shell-shaped entity stored in a stp format or a stl format;
step 2.6, importing the shell-shaped solid model obtained in the step 2.5 into finite element analysis software, setting constraint parameters, and submitting the constraint parameters to a finite element solver for solving to obtain an initial finite element analysis result;
step 2.7, carrying out topology optimization on the initial finite element analysis result obtained in the step 2.6, setting constraint parameters, carrying out optimization design iterative operation based on a sensitive algorithm, and obtaining a design result through PolyNURBS or manual package design;
step 2.8, outputting the STP or STL model of the design result obtained in the step 2.7 to reverse engineering or computer aided design software for final support redesign and obtaining an optimally designed support model;
and 2.9, outputting the model obtained in the step 2.8 into a universal 3D printing file, stl format, importing 3D printing software setting parameters, and printing and forming by using 3D printing forming equipment to finally obtain the personalized human body external fixing brace.
As a preferred technical solution, step 2.7 specifically includes:
step 2.7.1, taking the initial finite element analysis result obtained in the step 2.6 as an initial value, and entering step 2.7.2;
step 2.7.2, performing topology optimization on the model, setting constraint parameters and performing optimization design iterative operation based on a sensitive algorithm;
step 2.7.3, adjusting the density distribution to recalculate the design response to obtain the current iteration operation value;
step 2.7.4, judging whether other requirements such as safety factor and the like are met under the current iteration operation value, if so, entering step 2.7.6; if not, go to step 2.7.5;
step 2.7.5, taking the current iteration operation value as an initial value, and returning to the step 2.7.2;
step 2.7.6, the iterative operation value obtained in the step 2.7.4 is taken as a design result
As a preferred technical scheme, the surface of the object limb is scanned, and the point cloud data and asc format data are obtained through a three-dimensional laser scanner or a three-dimensional color scanner.
As a preferred technical scheme, the processing of the scanning data is completed in Jie magic engineering software, and the types of the scanning data comprise point cloud data obtained by reverse scanning.
Preferably, the surface modification treatment is at least one of smoothing, removing features, redrawing a mesh, removing nails, and the like, or repairing holes.
As a preferred technical scheme, geomagicDesignX is obtained by reverse modeling software; and performing operations such as field division, 3D sketch drawing, traditional boundary fitting and the like on the processed object limb model to complete the entity model.
As an optimal technical scheme, the shell-drawing lightening design is carried out on the finished solid model, and the preliminary lightening treatment on the model can be finished by operations such as shell-drawing, thickening curved surface, curved surface offset and the like.
As a preferred technical scheme, the general finite element analysis software is Inspire; the limiting parameters comprise material parameters, antagonistic load parameter conditions and boundary conditions; the constraint parameters comprise design variables, minimum thickness constraint, shape control and fixed constraint; the design variables are volume and weight, the minimum thickness constraint is the grid calculation size, and the shape control is the control of the pattern drawing direction and symmetry; the fixed constraint is a position fixed constraint on the model.
As a preferred technical scheme, the minimum thickness constraint of the model is used as a constraint condition of an optimization process, and light weight optimization analysis is carried out according to the load condition of the individualized limb part, the light weight, the strength requirement definition of the brace, the displacement, the safety coefficient, the yield percentage, the maximum stress, the Misses equivalent stress, the main stress and the main strain;
the topology optimization software is non-parametric topology optimization software; the non-parametric topology optimization software is a structure simulation module and a PolyNURBS module of Inspire software; the reverse engineering design software is GeomagicDesignX design software.
As a preferred technical scheme, the STL or STP model of the design result obtained from the initial finite element analysis result obtained in step 2.7 is derived and output to the reverse engineering geomagicdesign x software or the computer aided design software for re-designing the final brace.
As an optimal technical scheme, the model is output to be a universal 3D printing file for the brace model after the optimal design is obtained in stl format, 3D printing software setting parameters are imported, and 3D printing forming equipment is used for printing and forming to obtain the personalized human body external fixing brace, and the optimal design result of the brace is reset to be at least one of the attaching performance of the brace, the smooth of the hollow hole structure and the increase of the opening and closing structural characteristics convenient to wear.
The beneficial effects of the invention are: firstly, surface form contour data of the limbs of the subject is adopted, the data can be obtained through various devices, the requirement on hardware equipment is low, the data precision can meet the design requirement, and the implementation and popularization in primary medical institutions are facilitated;
secondly, the weight of the brace is reduced to the greatest extent, the maximum rigidity and strength of the brace under the condition of resisting the physiological load of the human body are ensured, and the wearing comfort and the orthopedic effect of the brace are both considered;
thirdly, the appearance of the personalized brace has a curvature form which is consistent with the height of the trunk and the limbs of the human body, so that personalized anatomical matching is achieved, and further, the comfort level and the wearing compliance of the brace can be greatly improved by selecting different 3D printing materials and matched optimized design structures, so that the orthopedic effect is maximized;
fourthly, through 3D printing and forming, the defects of long time consumption, high cost, complex working procedures and the like of the traditional manufacturing process are effectively overcome, and the timeliness from design to application is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a lightweight solution of the external fixing brace for human wrist based on topology optimization.
Fig. 2 is a schematic three-dimensional construction diagram of an outer contour model of a personalized human external fixation brace for a right upper limb in embodiment 2, in which a in fig. 2 is scanning data image acquisition, B in fig. 2 is processing of a limb surface point cloud, and C in fig. 2 is surface smoothing processing of a limb contour triangular patch.
FIG. 3 is a schematic view of a curved surface model of a human body external fixation brace, and A in FIG. 3 is a model
Reverse modeling, B in FIG. 3 is model pull-out mitigation.
Fig. 4 is a schematic diagram of the effect of the partially optimized iteration step of the external fixing brace of the human body, wherein a in fig. 4 is the 0 th iteration, B in fig. 4 is the 3 rd iteration, C in fig. 4 is the 6 th iteration, and D in fig. 4 is the 9 th iteration;
FIG. 5 shows the design result of the personalized external fixation brace for human body;
fig. 6 is a diagram of the simulation wearing effect of the personalized human body external fixation brace.
Detailed Description
All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
The invention discloses a lightweight solution of a human wrist external fixation brace based on topology optimization, which comprises the following steps as shown in figure 1:
1.1, scanning the object limb to obtain related point cloud data;
1.2, carrying out noise point processing on point cloud data acquired by scanning object limbs;
1.3, packaging and surface modifying the processed point cloud data;
1.4, importing the processed packaging data into computer aided design software for reverse modeling;
1.5, converting the processed model into a shell-shaped solid model, and performing shell extraction lightening treatment;
1.6, importing the processed model into finite element analysis software for finite element analysis;
1.7, carrying out lightweight design through finite element analysis software, and carrying out optimization design iterative operation based on a sensitive algorithm;
1.8, redesigning the model with the design result and obtaining an optimally designed brace model;
and 1.9, finally, carrying out 3D printing to obtain the personalized human body external fixing brace.
The method comprises the following steps:
2.1, scanning the surface of the limb of the object to obtain all point cloud data related to the limb, asc;
2.2, importing the point cloud data obtained in the step 2.1 into Jie magic engineering design software to carry out noise point processing;
2.3, packaging and surface modifying the point cloud data processed by the 2.2;
2.4, importing the packaged point cloud data processed by 2.3 into reverse engineering GeomagicDesignX software or computer aided design software for reverse modeling processing;
2.5, performing shell extraction and lightening treatment on the model processed by the reverse modeling in the step 2.4 to obtain a shell-shaped entity stored in an stp format or an stl format;
2.6, importing the 2.5 shell-shaped entity model into finite element analysis software, defining limiting parameters, submitting the limiting parameters to a finite element solver for solving, and obtaining an initial finite element analysis result;
2.7, carrying out topology optimization on the initial finite element analysis result obtained in the step 2.6, setting constraint parameters, carrying out optimization design iterative operation based on a sensitive algorithm, and obtaining a design result through PolyNURBS or manual wrapping;
2.8, outputting the STL or STP model obtained by the design result obtained by the step 2.7 to reverse engineering or computer aided design software for re-designing the final brace and obtaining a brace model after optimized design;
and 2.9, outputting the 2.8 model into a universal 3D printing file, stl format, and importing the file into 3D printing forming equipment for printing and forming to obtain the personalized human body external fixing brace.
In step 2.7, the method specifically comprises the following steps:
step 2.7.1, taking the initial finite element analysis result obtained in the step 2.6 as an initial value, and entering step 2.7.2;
step 2.7.2, carrying out topology optimization on the model, setting constraint parameters and carrying out optimization design iterative operation based on a sensitive algorithm;
step 2.7.3, adjusting density distribution to recalculate design response to obtain a current iteration operation value;
step 2.7.4, judging whether other requirements such as safety factors and the like are met under the current iteration operation value, and if so, entering step 2.7.6; if not, go to step 2.7.5;
step 2.7.5, taking the current iteration operation value as an initial value, and returning to the step 2.7.2;
and 2.7.6, taking the iterative operation value obtained in the step 2.7.4 as a design result.
The method comprises the steps of scanning the surface of an object limb, and obtaining point cloud data through a three-dimensional laser scanner or a three-dimensional color scanner.
The processing of the scanning data is completed in reverse engineering software, and the types of the scanning data comprise point cloud data obtained by reverse scanning.
In this embodiment, the surface modification treatment is at least one of smoothing, removing features, redrawing a grid, removing nails, or repairing holes.
GeomagicDesignX through reverse modeling software; and performing operations such as field division, 3D sketch drawing, traditional boundary fitting and the like on the processed object limb model to complete the entity model.
Performing shell-pulling lightening processing on the finished solid model, and finishing preliminary lightening processing on the model by using operations such as shell-pulling, thickening curved surface, curved surface offset and the like, wherein in the embodiment, the general finite element analysis software is Inspire;
in the embodiment, the limiting parameters comprise material parameters, antagonistic load parameter conditions and boundary conditions; the constraint parameters comprise design variables, minimum thickness constraint, shape control and fixed constraint; the design variables are volume and weight; the minimum thickness constraint is a grid calculation size; the shape control is control of the pattern drawing direction and symmetry, and the fixed constraint is position fixed constraint on the model.
In the embodiment, the minimum thickness constraint of the model is used as a constraint condition of an optimization process, and light weight optimization design is carried out according to the load condition of the individualized limb part, the light weight, the strength requirement definition of the brace, the displacement, the safety coefficient, the yield percentage, the maximum shear stress, the Missels equivalent stress, the main stress and the main strain; topology optimization
The software is non-parametric topology optimization software; the non-parametric topology optimization software is a structure simulation module and a PolyNURBS module of Inspire software; the reverse engineering design software is GeomagicDesignX design software.
In this embodiment, the STL or STP model of the obtained design result is derived from the obtained initial finite element analysis result, and is output to the reverse engineering geoimagisc design x software or the computer aided design software to perform the re-design of the final brace.
And outputting the model into a universal 3D printing file for the brace model after the optimized design, wherein the model is in stl format, and importing the model into 3D printing forming equipment for printing and forming to obtain the personalized human external fixed brace.
The design of the optimal design result of the brace is at least one of the characteristics of the fitting property of the brace, the smooth of the hollow hole structure and the increase of the structure which is convenient to wear and open and close.
The brace material parameter assignment selects the material parameter corresponding to the final 3D printing forming, and the load boundary condition parameter defines the load physiological data of different limb parts according to the previous biomechanics research literature or laboratory equipment measurement data; the meshing is completed by adopting an automatic meshing function provided by finite element software or manual package design.
The solid shell pulling function of the invention is to ensure the strength of the brace and simultaneously initially reduce the weight of the brace. The smoothing of the hollowed-out structure is to reduce local stress concentration.
The invention is mainly embodied in three main aspects of personalized anatomical design, controllable lightweight design and 3D printing forming manufacturing of the external fixing brace of the human body. In contrast, the traditional manual mold removal and shaping technical method is mostly adopted in the traditional processing and manufacturing of the external fixing brace for the human body, and the diversified and personalized requirements of clinical orthopedic treatment are difficult to meet in the aspects of anatomical matching degree, manufacturing cycle, wearing comfort level, brace mechanical property and the like.
In addition, the customized brace manufactured by the traditional process has higher processing cost and fussy process flow, and limits clinical popularization and application to a certain extent. The method is based on the individuation principle of deformity orthopedic treatment by establishing
The surface three-dimensional model is highly anatomically matched with the limb outline, the reverse engineering technology is adopted to design the curved surface of the brace on the basis, the topological optimization design is further carried out on the curved surface model of the brace, the finite element analysis technology, the continuum topological optimization technology and the 3D printing technology in the additive manufacturing field in the engineering technical field are comprehensively utilized, and finally the personalized anatomical design, the lightweight design and the controllable structural strength design of the human body external fixation brace are realized. For the final optimization design result, the 3D printing method is adopted to select materials with different performances to print and form the brace, so that various limitations of the brace in the aspects of design, materials and process are broken through, the brace can be widely used for orthopedic treatment of various bone joint diseases, and the brace has higher clinical applicability.
The invention relates to a lightweight solution of a human wrist external fixation brace based on topology optimization, which has the following beneficial effects: firstly, the surface form contour data of the object limb is adopted, the data can be acquired through various devices, the requirement on hardware equipment is low, the data precision can meet the design requirement, and the implementation and popularization of the surface form contour data in basic medical institutions are facilitated. Secondly, the lightweight of the brace is realized to the greatest extent, the maximum rigidity and strength of the brace under the condition of resisting the physiological load of the human body are ensured, and the wearing comfort and the orthopedic effect of the brace are considered. Thirdly, the appearance of the personalized brace has a curvature form which is consistent with the height of the trunk and the limbs of the human body, so that personalized anatomical matching is achieved, and further, the comfort level and the wearing compliance of the brace can be greatly improved by selecting different 3D printing materials and matched optimized design structures, so that the orthopedic effect is maximized. Fourthly, through 3D printing and forming, the defects of long time consumption, high cost, complex working procedures and the like of the traditional manufacturing process are effectively overcome, and the timeliness from design to application is greatly improved.
Example 2.
The invention discloses a lightweight solution of a human wrist external fixation brace based on topology optimization, which is explained by a specific individualized design of a human external fixation brace after a clinical common Korls fracture injury repair, and comprises the following specific implementation steps:
step 1.1, scanning the object limb to obtain related point cloud data.
The upper limb data of a target patient is acquired through a three-dimensional laser scanner or a three-dimensional color scanner device, and the scanned data completely covers the limb range required to be fixed by a human body external fixing brace to obtain point cloud data and asc format data.
Step 1.2, carrying out noise point processing on point cloud data acquired by scanning object limbs:
the processing of the scanning data is completed in wrap Jie magic engineering software, and the types of the scanning data comprise point cloud data obtained by reverse scanning.
Step 1.3, packaging and surface modification treatment are carried out on the processed point cloud data:
and (3) carrying out operations of packaging, surface smoothing, hole filling, curved surface trimming, removing features, grid redrawing, nail removal and the like on the limb outer contour point cloud established in the step (1.2) to obtain a support shell-shaped curved surface model.
Step 1.4, importing the packaging data processed in the step 1.3 into computer aided design software for reverse modeling: geomagicDesignX through reverse modeling software; and (4) importing the obtained limb outer contour shell-shaped curved surface model encapsulation data STL file of the Coriolis fracture injury processed in the step 1.3 into reverse modeling software to perform operations such as field division, 3D draft drawing, traditional boundary fitting and the like, thereby completing the solid model.
Step 1.5, converting the processed model into a shell-shaped solid model, and performing shell extraction lightening treatment:
and (4) carrying out shell-pulling lightening design on the entity model completed in the step (1.4), and finishing primary lightening treatment on the model by using shell-pulling operation.
Step 1.6, importing the processed model into finite element analysis software for finite element analysis:
the general finite element analysis software is Inspire; and (4) importing the support STP model obtained in the step 1.5 into general finite element analysis software, and sequentially carrying out finite element modeling pretreatment. Firstly, endowing corresponding material attributes of later-stage 3D printing of a brace model, and adding gravity; secondly, defining the motion load direction and amplitude of the wrist joint by referring to the motion mode of the wrist joint of the upper limb, and fixing the proximal end of the constraint brace with 6 degrees of freedom; to the shell-shaped branch
Setting parameters for analysis by the model, and finally submitting the model to a finite element solver for initial analysis.
Step 1.7, carrying out lightweight design through finite element analysis software, and carrying out optimization design iterative operation based on a sensitive algorithm:
according to the initial finite element analysis result of the step 1.6, the design goal of brace optimization is defined to minimize the strain energy of the brace (namely, maximize the rigidity) under the volume fraction constraint of the self-defined lightweight design and under the condition of preset load parameters, and a topological optimization model of the human body external fixation brace is established through a variable density algorithm.
The specific parameter setting comprises the following steps: firstly, defining design variables including total strain energy of a brace model and the volume of the brace model; secondly, defining an objective function as minimizing the strain energy of the brace; third, the constraint is defined as a 30% volume constraint fraction; and fourthly, selecting the opening position of the far end and the near end of the brace as a non-design area which does not participate in optimization. After the parameter setting is completed, the calculation result is submitted to a topology optimization solver to perform iterative solution, an iterative process is optimized, and a final brace topology optimization result is obtained, as shown in fig. 4 and 5.
Step 1.8, redesigning the model with the design result and obtaining the brace model after optimized design:
and (4) outputting the optimized design result obtained in the step (1.7) by using an STL file, and importing the optimized design result into Jie magic engineering software for redesign optimization. In the re-designing process, the model surface is subjected to surface smoothing treatment, excessive burr repairing and intersection construction, and finally the shaping design result and the simulated wearing effect of the brace are output, as shown in fig. 6.
Step 1.8, finally obtaining the personalized human body external fixation brace through 3D printing:
outputting a 3D printed STL file by the obtained brace design model, setting parameters such as model filling rate, generation of printing support and the like for the brace through general printing software, and finally completing printing and forming of the brace by using 3D printing equipment so as to obtain a finished product of the human body external fixation brace.
The invention relates to a lightweight solution of a human wrist external fixation brace based on topology optimization, which has the following beneficial effects: firstly, the surface form contour data of the object limb is adopted, the data can be acquired through various devices, the requirement on hardware equipment is low, the data precision can meet the design requirement, and the implementation and popularization of the surface form contour data in basic medical institutions are facilitated. Secondly, the lightweight of the brace is realized to the greatest extent, the maximum rigidity and strength of the brace under the condition of resisting the physiological load of the human body are ensured, and the wearing comfort and the orthopedic effect of the brace are considered. Thirdly, the appearance of the personalized brace has a curvature form which is consistent with the height of the trunk and the limbs of the human body, personalized anatomical matching is achieved, and further, the comfort level and the wearing compliance of the brace can be greatly improved by selecting different 3D printing materials and matched optimized design structures, so that the orthopedic effect is maximized. Fourthly, through 3D printing and forming, the defects of long time consumption, high cost, complex working procedures and the like of the traditional manufacturing process are effectively overcome, and the timeliness from design to application is greatly improved.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (12)
1. A lightweight realization method of a human wrist external fixation brace based on topology optimization is characterized by comprising the following steps: the method comprises the following steps:
step 1.1, scanning the object limb to obtain related point cloud data;
step 1.2, carrying out noise point processing on point cloud data acquired by scanning object limbs;
step 1.3, packaging and surface modification treatment are carried out on the processed point cloud data;
step 1.4, importing the processed packaging data into computer aided design software for reverse modeling;
step 1.5, converting the modeled model into a shell-shaped solid model, and carrying out shell extraction lightening design;
step 1.6, carrying out finite element analysis on the processed model;
step 1.7, carrying out lightweight design through finite element analysis software, and carrying out optimization design iterative operation based on a sensitive algorithm;
step 1.8, outputting the STL model of the design result to design software for re-designing of the final brace and obtaining a brace model after optimized design;
and 1.9, obtaining the personalized human body external fixation brace by using 3D printing.
2. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 1, wherein the method comprises the following steps:
step 2.1, scanning the surface of the limb of the object to obtain all point cloud data related to the limb, asc;
step 2.2, importing the point cloud data obtained in the step 2.1 into Jie magic engineering design software for noise point processing;
step 2.3, the point cloud data processed in the step 2.2 is processed by packaging, surface modification and the like, and stored in a stl format;
step 2.4, importing the packaged point cloud data processed in the step 2.3 into reverse engineering GeomagicDesignX software or computer aided design software for reverse modeling processing;
step 2.5, performing shell-extraction lightening design on the model processed in the step 2.4 through reverse modeling to obtain a shell-shaped entity stored in a stp format or a stl format;
step 2.6, importing the shell-shaped solid model obtained in the step 2.5 into finite element analysis software, setting constraint parameters, and submitting the constraint parameters to a finite element solver for solving to obtain an initial finite element analysis result;
step 2.7, carrying out topology optimization on the initial finite element analysis result obtained in the step 2.6, setting constraint parameters, carrying out optimization design iterative operation based on a sensitive algorithm, and obtaining a design result through PolyNURBS or manual package design;
step 2.8, outputting the STP or STL model of the design result obtained in the step 2.7 to reverse engineering or computer aided design software for final support redesign and obtaining an optimally designed support model;
and 2.9, outputting the model obtained in the step 2.8 into a universal 3D printing file, stl format, importing 3D printing software setting parameters, printing and forming by using 3D printing forming equipment, and finally obtaining the personalized human body external fixing brace.
3. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: in step 2.7, the method specifically comprises the following steps:
step 2.7.1, taking the initial finite element analysis result obtained in the step 2.6 as an initial value, and entering step 2.7.2;
step 2.7.2, carrying out topology optimization on the model, setting constraint parameters and carrying out optimization design iterative operation based on a sensitive algorithm;
step 2.7.3, adjusting density distribution to recalculate design response to obtain a current iteration operation value;
step 2.7.4, judging whether other requirements such as safety factors and the like are met under the current iteration operation value, and if so, entering step 2.7.6; if not, go to step 2.7.5;
step 2.7.5, taking the current iteration operation value as an initial value, and returning to the step 2.7.2;
and 2.7.6, taking the iterative operation value obtained in the step 2.7.4 as a design result.
4. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: and scanning the surface of the object limb, and obtaining point cloud data through a three-dimensional laser scanner or a three-dimensional color scanner.
5. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: the processing of the scanned data is completed in the jie magic engineering software, and the types of the scanned data comprise point cloud data obtained by reverse scanning.
6. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: the surface modification treatment is at least one of light smoothing, removing features, redrawing grids, deleting nails and the like or repairing holes.
7. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: geomagicDesignX is obtained through reverse modeling software; and performing operations such as field division, 3D sketch drawing, traditional boundary fitting and the like on the processed object limb model to complete the entity model.
8. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: and performing shell-pulling lightening design on the finished entity model, and finishing preliminary lightening treatment on the model by using operations such as shell pulling, thickening curved surface imparting, curved surface deviation and the like.
9. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: the general finite element analysis software is Inspire; the limiting parameters comprise material parameters, antagonistic load parameter conditions and boundary conditions; the constraint parameters comprise design variables, minimum thickness constraint, shape control and fixed constraint; the design variables are volume and weight, the minimum thickness constraint is the grid calculation size, and the shape control is the control of the pattern drawing direction and symmetry; the fixed constraint is a position fixed constraint on the model.
10. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: the minimum thickness constraint of the model is used as a constraint condition of the optimization process, and light weight optimization analysis is carried out according to the load condition of the individual limb part, the definition of light weight and the strength requirement of the brace, the displacement, the safety coefficient, the yield percentage, the maximum stress, the Misses equivalent stress, the main stress and the main strain;
the topology optimization software is non-parametric topology optimization software; the non-parametric topology optimization software is a structure simulation module and a PolyNURBS module of Inspire software; the reverse engineering design software is GeomagicDesignX design software.
11. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein: and (3) exporting the initial finite element analysis result obtained in the step (2.7) to obtain an STL or STP model of a design result, and outputting the STL or STP model to reverse engineering GeomagicDesignX software or computer aided design software for re-designing the final brace.
12. The method for realizing the lightweight of the external fixing brace for the wrist of the human body based on the topological optimization as claimed in claim 2, wherein the method comprises the following steps: and outputting the model into a universal 3D printing file for the brace model after the optimized design, importing 3D printing software setting parameters, printing and forming by using 3D printing forming equipment to obtain an individualized human body external fixed brace, and designing the reset of the brace optimized design result into at least one of the fitting property of the brace, the smooth of the hollow hole structure and the increase of the opening and closing structural characteristics convenient to wear.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116373306A (en) * | 2023-02-13 | 2023-07-04 | 首都博物馆 | 3D printing design method for vibration-proof conformal clamping piece of cultural relics in collection |
| CN117010042A (en) * | 2023-09-28 | 2023-11-07 | 武汉必盈生物科技有限公司 | Extension method and device for external fixation wrist of 3D printing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116373306A (en) * | 2023-02-13 | 2023-07-04 | 首都博物馆 | 3D printing design method for vibration-proof conformal clamping piece of cultural relics in collection |
| CN116373306B (en) * | 2023-02-13 | 2023-10-20 | 首都博物馆 | 3D printing design method for vibration-proof conformal clamping piece of cultural relics in collection |
| CN117010042A (en) * | 2023-09-28 | 2023-11-07 | 武汉必盈生物科技有限公司 | Extension method and device for external fixation wrist of 3D printing |
| CN117010042B (en) * | 2023-09-28 | 2023-12-29 | 武汉必盈生物科技有限公司 | Extension method and device for external fixation wrist of 3D printing |
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