Digitized Design, 3D Printing Of A Personalized Rehabilitation Orthosis Based On Anatomical Morphology

Objectives:Explore the basis of anatomical morphology and finite element analysis,3D printing personalized digitized rehabilitation orthosis digital design and production of the program,making based on the design and production of 3D printing rehabilitation orthosis can achieve optimal structure,save material,increase air permeability;Based on this design,the satisfaction of the 3D printed rehabilitation orthosis wearer is designed to verify the practicality of the designed 3D printed rehabilitation orthosis.Methods:(1)Using the T1-mDIXON-W series scanning mode of Philips-Medical-Systems-Ingenia 3.0T MRI to scan the upper and lower extremities separately and collect the lower elbow and the lower part of the lower extremity.The output is saved as DICOM format image data.Then Mimics19.0 software was used to reconstruct the contour model of the skin of the corresponding part and saved as STL file.The Geomagic studio software was used to optimize the surface of the model,meshing,and precise surface processing.Then the NURBS surface was constructed and the finite element model was built.,Then use Abaqus finite element analysis software for finite element analysis and topology optimization,set 10 different optimization values(5%,10%,15%,20%,25%,30%,35%,40%,45%,50%)Topology optimization respectively,so as to find the appropriate optimization value,optimize the model structure,guide the model’s digging hole design according to the optimization result map and stress cloud diagram,and realize the ventilation of the orthosis;(2)Based on the protocol design,3D printed rehabilitation orthosis was printed on the MakerBot Replicator Z18 and EOS 3D printers by FDM(fusion deposition method)using PLA(polylactic acid)and nylon materials,and then passed through 30 volunteers [male 15 people,15 women,age(24.26±2.38)years old,weight(59.67±10.63)kg] 3D printed personalized orthosis designed and manufactured using this protocol.In the early stage due to tissue swelling,the patient was first reset with cast immobilization,after swollen and wearing a 3D print orthosis,the Quebec Assistive Technology User Satisfaction Assessment Questionnaire 2.0,filled out by volunteers,was collected four weeks later.The questionnaire was jointly developed by scientists from Canada,the United States,the Netherlands,and other countries.It was internationally recognized for evaluating new ones.Whether the manufactured device can be used for rehabilitation therapy.There are 12 indicators in the table,which are: 1.Size,2.Weight,3.Easy to adjust,4 Security,5.Durability,6.Easy to use,7.Comfort,8.Effectiveness,9.Cycle,10.Maintenance,11.Professional Services,12.Follow-up Service,according to the results of questionnaires filled out by volunteers,SPSS19.0 software is used for statistical analysis,calculating the satisfaction of each index,and evaluating the design of the program from statistical data.The utility of 3D printing rehabilitation orthosis.Results:(1)The program design,3D printing personalized rehabilitation orthoses,analysis and optimization of the model structure using finite element analysis software,the upper limb after 30 times,the lower limb after 42 iterations of the iterative calculation,the optimal control at 10% to 20 %,The model has less influence on the biomechanical properties,which in turn guides the optimal design of the orthosis.The 3D printed rehabilitation orthosis model structure is optimized,the volume is reduced,the breathability is increased,and a large amount of material is also saved.(2)Analysis of the Quebec Assistive Technology User Satisfaction Assessment Scale 2.0,filled out by 30 volunteers,from the data analysis of the scale,1.size,2.quality,3.easy adjustment,4.security,5 Durability,6.Easy to use,7.Comfortness,8.Effectiveness,9.Cycle,10.Maintenance,11.Professional services,12.Follow-up services all showed significant(P < 0.05),meaning Obstacles These indicators have statistically significant differences.From the perspective of the orthosis,if more than 60% of the samples in the sample are selected as “5”,then the size of the 3D printing orthosis is also very satisfactory;more than 70% of the weight of the orthosis is selected as “5”,which is very satisfactory.It can be seen that the volunteers are very satisfied with the weight of the orthoses;from the repect of the easy adjustment of the orthoses,most of the samples are “4” and the ratio is 76.7%;from the perspective of the safety distribution of the orthoses,most of the samples are “4”.There are 22 in total,accounting for 73.3%;more than 50% of the durability of the orthoses is selected as “4”;in terms of ease of use of the orthoses,more than 70% of the samples are “4”;comfort in terms of distribution,most of the samples are “4” and 21 in total,accounting for 70.0%;in terms of effectiveness distribution,most of the samples are “4”,and there are 22 in total,accounting for 73.3% of the sample.The percentage of 4" is 60.0%;from the maintenance point of view,more than 70% of the samples in the sample are "4";from the professional service distribution,most of the samples are "4",the ratio is 80.0%,and it has reached 80%.It can be seen that volunteers are recognized for our professional service;Service point of view,there are more than 60 percent of the sample in the sample is "4",that we have to strengthen the follow-up services.Conclusion:(1)Based on anatomical morphology and finite element analysis,the orthoses designed and produced by 3D printing have a simple manufacturing process and do not require traditional machine tools to reduce the difficulty of making orthopaedics to a certain extent;at the same time,3D printing data collection is free of radiation.The quality of the orthoses can be controlled and individualized private customization can be achieved.The 3D printed orthoses are beautiful in appearance,colors are available,and the rate of rejection is low;the optimization rate of the finite element analysis is 10% to 20%,and the biomechanical performance is smaller,can achieve structural optimization.(2)According to anatomic morphology,the whole and special parts(ulnar styloid process,internal and external condyle)are offset 2 mm outwards to avoid skin pressure and friction and improve the comfort of the orthoses;according to the stress map,layout 3 mm ventilation holes the location is breathable and breathable,which saves material and reduces the incidence of skin problems.(3)In the orthotic size,orthoses weight,ease of use of orthoses and indicators of professional services more than 60% satisfaction,especially professional indicators are very satisfied with more than 80%,Quebec assisted technology satisfaction evaluation the scale shows that the design and production of the3D-printed rehabilitation orthosis developed by this project is feasible.