CN112075990A - Calcaneus prosthesis with spherical porous filling structure and optimal design method thereof - Google Patents
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- 210000000459 calcaneus Anatomy 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000013461 design Methods 0.000 title claims description 11
- 238000006073 displacement reaction Methods 0.000 claims abstract description 19
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- 239000011295 pitch Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000013334 tissue model Methods 0.000 claims description 3
- 238000001356 surgical procedure Methods 0.000 description 3
- 206010016970 Foot fracture Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 210000000474 heel Anatomy 0.000 description 2
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
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Abstract
The invention discloses a method for designing a calcaneus prosthesis with a spherical porous filling structure, which specifically comprises the following steps: step S1, obtaining a calcaneus prosthesis model composed of a calcaneus, soft tissues and the ground; step S2, carrying out porous structure modeling on the calcaneus model to obtain a calcaneus prosthesis model with a spherical porous filling structure; step S3, respectively formulating combinations of different sphere radiuses r and array intervals a to obtain a plurality of spherical porous filling structure calcaneus prosthesis models; step S4, carrying out finite element analysis on a plurality of models respectively composed of the calcaneus prosthesis, soft tissues and the ground in ABAQUS to obtain data of strain energy, stress, displacement and the like of the calcaneus prostheses; and step S5, comparing the data of the maximum strain energy, the maximum stress, the maximum displacement and the like of the spherical porous filling structure calcaneus prosthesis models with different porosities to obtain the optimal spherical porous filling structure calcaneus prosthesis optimized structure. The invention also provides a calcaneus prosthesis with a spherical porous filling structure.
Description
Technical Field
The invention relates to an optimal design method, in particular to an optimal design method of a calcaneus prosthesis with a spherical porous filling structure.
Background
The calcaneus is the largest, tarsal, bone in the foot and is therefore also highly vulnerable to injury. Common forms of calcaneus injury include calcaneus fractures, and currently there are two major treatments for calcaneus fractures, surgical and non-surgical. Wherein the surgical treatment mainly comprises: incision reduction internal fixation surgery, and heel bone prosthesis replacement surgery based on additive manufacturing technology. For the replacement operation of the calcaneus prosthesis, it is difficult to obtain the relevant mechanical properties of the calcaneus prosthesis in the foot motion process and complete the design of the calcaneus prosthesis through an experimental method at present.
Disclosure of Invention
The invention aims to solve the main technical problems that the relevant mechanical properties of the calcaneus prosthesis in the foot movement process are simulated by a finite element numerical simulation method, and the calcaneus prosthesis structure is optimally designed by a method of digging holes in the porous filling structure of the calcaneus prosthesis ball.
In order to solve the technical problem, the invention provides an optimal design method of a spherical porous filling structure calcaneus prosthesis, which comprises the following steps:
step S1, creating a plurality of calcaneus prosthesis models composed of calcaneus, soft tissues and the ground;
step S2, carrying out porous structure modeling on a plurality of calcaneus prosthesis models to obtain a spherical porous filling structure calcaneus prosthesis model;
step S3, changing the radius and the spacing of the porous structure to obtain a plurality of spherical porous filling structure calcaneus prosthesis models with different porosities;
step S4, carrying out finite element analysis on the plurality of spherical porous filling structure calcaneus prosthesis models with different porosities in ABAQUS to obtain strain energy, stress and displacement of the plurality of spherical porous filling structure calcaneus prosthesis models with different porosities;
and step S5, comparing the maximum strain energy, the maximum stress and the maximum displacement of the plurality of ball porous filling structure calcaneus prosthesis models with different porosities to obtain the optimal ball porous filling structure calcaneus prosthesis optimized structure.
In a preferred embodiment: the step S1 specifically includes:
step S11: acquiring CT scanning data of the foot by utilizing a CT scanning technology;
step S12: importing foot CT scanning data into medical software MIMICS, and establishing a calcaneus solid model through corresponding mask extraction, threshold segmentation, region growing, mask editing and 3D calculation operations;
step S13: obtaining a smooth calcaneus model through the operations of polygon processing, curved surface construction, curved surface refinement and smooth processing in the Geomagic Studio;
step S14: and (3) introducing the calcaneus model into UG, obtaining a soft tissue model and a ground model in the UG, and finally assembling the three models together.
In a preferred embodiment: the step S2 specifically includes:
step S21: setting a calcaneus region in UG;
step S22: selecting a calcaneus region as a porous structure filling region, and establishing a spherical array porous filling model in the region to obtain a spherical porous filling structure calcaneus prosthesis model; the establishment rule of the sphere array porous filling model is that a sphere model with the radius r is used and the sphere model is arrayed at the interval a.
In a preferred embodiment: the step S3 specifically includes:
step S31: respectively formulating combinations of different sphere radiuses r and array pitches a;
step S32: and (5) repeatedly executing the step 2 to obtain a plurality of spherical porous filling structure calcaneus prosthesis models with different porosities.
In a preferred embodiment: the step S4 specifically includes:
step S41: introducing a plurality of calcaneus prosthesis models with spherical porous filling structures of different porosities into ABAQUS, and performing material attribute endowment, meshing and contact setting in the ABAQUS;
step S42: setting boundary conditions and load application of a calcaneus prosthesis model, simulating a foot landing process, and performing dynamic analysis;
step S43: and after the analysis is finished, deriving strain energy, stress and displacement data of the calcaneus prosthesis model.
In a preferred embodiment: the step S5 specifically includes:
step S51: obtaining maximum strain energy, maximum stress and maximum displacement data of each bone prosthesis model;
step S52: respectively comparing the maximum strain energy, the maximum stress and the maximum displacement of the plurality of ball porous filling structure calcaneus prosthesis models with different porosities to obtain an optimal ball porous filling structure calcaneus prosthesis optimization structure.
The invention also provides a calcaneus prosthesis with the spherical porous filling structure, which comprises the calcaneus prosthesis and a hollow spherical array filled in the calcaneus prosthesis.
In a preferred embodiment: the sphere radius is 4mm, the array spacing is 8mm, and the porosity is 0.78%.
Compared with the prior art, the invention has the following beneficial effects:
1) the calcaneus prosthesis with the porous structure can effectively reduce the stress shielding effect of the calcaneus prosthesis;
2) the calcaneus prosthesis structure containing the spherical porous filling structures with different porosities is subjected to kinetic analysis by using ABAQUS, and the maximum strain energy, the maximum stress and the maximum displacement of the calcaneus prosthesis are obtained.
3) The optimal calcaneus prosthesis optimization structure is obtained by comparing the maximum strain energy, the maximum stress and the maximum displacement of a plurality of spherical porous filling structures with different porosities and spatial distributions.
Drawings
FIG. 1 is a schematic flow chart of the main steps of the method of the present invention;
FIG. 2 is a model diagram of an optimal porous structure calcaneus prosthesis;
FIG. 3 is a model of a calcaneus prosthesis composed of the calcaneus, soft tissue and the ground in accordance with a preferred embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Referring to fig. 1-3, a method for optimally designing a calcaneus prosthesis with a spherical porous filling structure comprises the following steps:
step S1, creating a plurality of calcaneus prosthesis models composed of calcaneus, soft tissue and ground, specifically including:
step S11: acquiring CT scanning data of the foot by utilizing a CT scanning technology;
specifically, the CT scanning data in the invention is obtained from a volunteer, a male, and the weight of the male is 58 kg;
step S12: importing foot CT scanning data into medical software MIMICS, and establishing a calcaneus solid model through operations such as mask extraction, threshold segmentation, region growing, mask editing, 3D calculation and the like correspondingly;
step S13: adopting operations such as polygon processing, curved surface construction, curved surface refinement, fairing processing and the like in the Geomagic Studio to obtain a fairing calcaneus model;
step S14: and (3) introducing the calcaneus model into UG, obtaining a soft tissue model and a ground model in the UG, and finally assembling the three models together.
Step S2, porous structure modeling is carried out on a plurality of calcaneus prosthesis models, so as to obtain a calcaneus prosthesis model with a spherical porous filling structure, and the method specifically comprises the following steps:
step S21: setting a calcaneus region in UG;
step S22: selecting a calcaneus region as a porous structure filling region, and establishing a spherical array porous filling model in the region to obtain a spherical porous filling structure calcaneus prosthesis model; the establishment rule of the sphere array porous filling model is that a sphere model with the radius r is used and the sphere model is arrayed at the interval a.
Step S3, changing the radius and the space of the porous structure to obtain a plurality of spherical porous filling structure calcaneus prosthesis models with different porosities, which specifically comprises the following steps:
step S31: respectively formulating combinations of different sphere radiuses r and array pitches a;
step S32: and (5) repeatedly executing the step 2 to obtain a plurality of spherical porous filling structure calcaneus prosthesis models with different porosities.
Step S4, carrying out finite element analysis on the plurality of spherical porous filling structure calcaneus prosthesis models with different porosities in ABAQUS to obtain strain energy, stress and displacement of the plurality of spherical porous filling structure calcaneus prosthesis models with different porosities; the method specifically comprises the following steps:
step S41: introducing a plurality of calcaneus prosthesis models with spherical porous filling structures of different porosities into ABAQUS, and performing material attribute endowment, meshing and contact setting in the ABAQUS;
specifically, the density of the calcaneus is set to be 1500kg/m3Elastic modulus is set to 7300MPa, Poisson's ratio is set to 0.3; the density of the soft tissue is set to be 937kg/m3The modulus of elasticity is set to 0.45MPa, and the Poisson ratio is set to 0.48; the density to the ground was set to 2500kg/m3The modulus of elasticity was set at 17000MPa and the Poisson's ratio was set at 0.1. The soft tissue is in surface-to-surface contact with the ground, and the friction factor is 0.6; the calcaneus prosthesis is in Tie contact with the soft tissue. And (4) contact relation.
Step S42: setting boundary conditions and load application of a calcaneus prosthesis model, simulating a foot landing process, and performing dynamic analysis;
specifically, the bottom of the ground is set as a fixed constraint; the calcaneus and the soft tissues simulate the motion process of the foot, the initial speed is set to be 1650mm/s in the x-axis direction and-230 mm/s in the z-axis direction before the calcaneus and the soft tissues are contacted with the ground. A set of distance, heel dice, and plantar heel nodes were created for applying the load, and the x-, y-, and z-axis load distributions varied in time as follows.
Step S43: and after the analysis is finished, deriving strain energy, stress and displacement data of the calcaneus prosthesis model.
Step S5, comparing the data of maximum strain energy, maximum stress, maximum displacement and the like of the spherical porous filling structure calcaneus prosthesis model with different porosities to obtain the optimal calcaneus prosthesis structure, which specifically comprises the following steps:
step S51: obtaining maximum strain energy, maximum stress and maximum displacement data of each calcaneus prosthesis model;
step S52: the maximum strain energy, the maximum stress and the maximum displacement of the spherical porous filling structure calcaneus prosthesis with different porosities are compared respectively to obtain the optimal optimized structure of the spherical porous filling structure calcaneus prosthesis, namely when the radius of a sphere is 4mm and the array interval is 8mm, the porosity of the spherical porous filling structure calcaneus prosthesis is 0.78%.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (8)
1. A method for optimally designing a calcaneus prosthesis of a spherical porous filling structure is characterized by comprising the following steps of:
step S1, creating a plurality of calcaneus prosthesis models composed of calcaneus, soft tissues and the ground;
step S2, carrying out porous structure modeling on a plurality of calcaneus prosthesis models to obtain a spherical porous filling structure calcaneus prosthesis model;
step S3, changing the radius and the spacing of the porous structure to obtain a plurality of spherical porous filling structure calcaneus prosthesis models with different porosities;
step S4, carrying out finite element analysis on the plurality of spherical porous filling structure calcaneus prosthesis models with different porosities in ABAQUS to obtain strain energy, stress and displacement of the plurality of spherical porous filling structure calcaneus prosthesis models with different porosities;
and step S5, comparing the maximum strain energy, the maximum stress and the maximum displacement of the plurality of ball porous filling structure calcaneus prosthesis models with different porosities to obtain the optimal ball porous filling structure calcaneus prosthesis optimized structure.
2. The optimized design method of the spherical porous filling structure calcaneus prosthesis according to claim 1, characterized in that: the step S1 specifically includes:
step S11: acquiring CT scanning data of the foot by utilizing a CT scanning technology;
step S12: importing foot CT scanning data into medical software MIMICS, and establishing a calcaneus solid model through corresponding mask extraction, threshold segmentation, region growing, mask editing and 3D calculation operations;
step S13: obtaining a smooth calcaneus model through the operations of polygon processing, curved surface construction, curved surface refinement and smooth processing in the Geomagic Studio;
step S14: and (3) introducing the calcaneus model into UG, obtaining a soft tissue model and a ground model in the UG, and finally assembling the three models together.
3. The optimized design method of the spherical porous filling structure calcaneus prosthesis according to claim 1, characterized in that: the step S2 specifically includes:
step S21: setting a calcaneus region in UG;
step S22: selecting a calcaneus region as a porous structure filling region, and establishing a spherical array porous filling model in the region to obtain a spherical porous filling structure calcaneus prosthesis model; the establishment rule of the sphere array porous filling model is that a sphere model with the radius r is used and the sphere model is arrayed at the interval a.
4. The optimized design method of the spherical porous filling structure calcaneus prosthesis according to claim 1, characterized in that: the step S3 specifically includes:
step S31: respectively formulating combinations of different sphere radiuses r and array pitches a;
step S32: and (5) repeatedly executing the step 2 to obtain a plurality of spherical porous filling structure calcaneus prosthesis models with different porosities.
5. The optimized design method of the spherical porous filling structure calcaneus prosthesis according to claim 1, characterized in that: the step S4 specifically includes:
step S41: introducing a plurality of calcaneus prosthesis models with spherical porous filling structures of different porosities into ABAQUS, and performing material attribute endowment, meshing and contact setting in the ABAQUS;
step S42: setting boundary conditions and load application of a calcaneus prosthesis model, simulating a foot landing process, and performing dynamic analysis;
step S43: and after the analysis is finished, deriving strain energy, stress and displacement data of the calcaneus prosthesis model.
6. The optimized design method of the spherical porous filling structure calcaneus prosthesis according to claim 1, characterized in that: the step S5 specifically includes:
step S51: obtaining maximum strain energy, maximum stress and maximum displacement data of each bone prosthesis model;
step S52: respectively comparing the maximum strain energy, the maximum stress and the maximum displacement of the plurality of ball porous filling structure calcaneus prosthesis models with different porosities to obtain an optimal ball porous filling structure calcaneus prosthesis optimization structure.
7. The utility model provides a ball porous filling structure calcaneus prosthesis which characterized in that includes calcaneus prosthesis and fills in the hollow ball array in calcaneus prosthesis.
8. The spherical porous filling structure calcaneus prosthesis according to claim 7, wherein: the sphere radius is 4mm, the array spacing is 8mm, and the porosity is 0.78%.
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| CN112690932B (en) * | 2020-12-25 | 2023-07-28 | 北京爱康宜诚医疗器材有限公司 | Method for processing vertebral prosthesis |
| CN114398799A (en) * | 2022-01-26 | 2022-04-26 | 华侨大学 | Optimization design method of variable gradient implant structure of molar prosthesis |
| CN114429045A (en) * | 2022-01-26 | 2022-05-03 | 华侨大学 | Optimization design method for variable-gradient dental crown structure of molar prosthesis |
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