医用可降解锌基骨钉的力学性能分析及结构优化
Abstract
Zinc-basedalloysarebiodegradable,biocompatible,andmechanicallyexcellent,
showingpotentialforbiologicalimplants.OurteamdevelopedaZn-Mn-Mgalloymaterial,
whichrequiredatailoredscrewdesignastraditionalonesareunsuitable.Usingthe
maxillofacialfracturebonescrewasaninstance,thispaperoptimizesthebonescrewdesign,
takingintoaccountthemechanicalpropertiesofthisnovelmaterial.
Inthispaper,bonenailstructuraldimensionsaredeterminedbasedonmedicalindustry
norms,withaSolidworksmodelcreated.Theoreticalanalysiscoversself-attackandpull-out
forces.Ansyssimulatesscrewbending,twisting,andpull-outtoassessstressdistribution.
Optimalbonescrewstructureisdeterminedbycomparingthreadsymmetryandtailcutting
designs.Single-variablepitch,toothhalf-angle,andouterdiametereffectsonmechanical
propertiesareexplored,withoptimalparametersdeterminedthroughorthogonalexperiments
andvarianceanalysis.Pre-andpost-optimizationbonenailsaretestedfortorsion,axialpull,
self-tapping,andtwisting,verifyingsimulationresultsusingabonescrewperformancetester.
Thetailcuttingscrewstorsionalresistanceisweak,withtailcuttinghavinglittleimpact
onpullingandbending.Symmetricalthreadsoffersuperiorpull-outandanti-torsion
comparedtoasymmetricones,withsymmetrynotaffectingbending.Asthebonenails
externaldiameterincreases,itsbendingandtorsionalstrengthrise,andbone-threadbiting
forceenhances.Aspitchincreases,bonenailsbendingforcerises.Torqueinitiallyfallsthen
rises,reachingitsnadirat0.75mm,withnonotableimpactonunplugging.Toothalf-angle
doesntsignificantlyaffectscrewbearingcapacity,butstressconcentrationvariesgreatlyin
torsionandextractionsimulations.Comprehensivesingle-factorandrangeanalysesyie