翻译英文Word文档下载推荐.docx
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翻译英文Word文档下载推荐.docx
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Fudanuniversityofpolymerscience,polymermolecularengineeringofministryofeducationkeylaboratoryofShanghai
Abstract:
oneofthekeytechnologyoftissueengineeringistohavegoodbiocompatibilityandbiodegradationabsorptionperformanceofbiomaterialspreparationintoconnectedwithaspecificshapeandporestructureofthree-dimensionalporousscaffolds,extracellularmatrixsubstitution).Thispaperfocusesonporousscaffoldspreparationmethodsrespectivelyandporousscaffoldporestructureandshapeoftheinnerlink,fromtwolevelstoholeandshapeformingontissueengineeringporousscaffoldspreparationmethodsandtechnologiesofrecentresearchprogressarereviewed.
Keywords:
tissueengineering;
Porousscaffolds;
Biomedicalmaterials;
Biodegradablepolymer
Tissueengineeringisthebasicprincipleandmethodoftheinvitrocultureandamplificationofthenormaltissuecellsgrowtohavegoodbiocompatibilityandcanbegraduallydegradedinthebodytoabsorbontissueengineeringporousscaffolds,formacell?
Scaffolds,cellproliferationanddifferentiationontheholder,andthenimplantedtissuedamagetothecomplexparts,continuetoproliferationandsecretionofextracellularmatrixinthebody,withthegradualdegradationofthematerial,formnewcompatiblewithitsfunctionandformoftissueororgans,soastoachievethepurposeofrepairingdamagetotissuesororgans.Thismethodwillmaketissuedefecttreatmentfromaneweraoforgantransplantorgansintomanufacturing.
polymers.Asaneffectivecellsscaffold,materialitselfisnotenough.Oneofthekeytechnologyoftissueengineeringisthebiologicalmaterialswithacertainshapeandporestructureofthree-dimensionalporousscaffolds.Therehavebeenmanyarticlesontissueengineeringporousscaffolds,thepreparationmethodsareintroducedandreviewed,butfocusesontheholemethodandthebracketholestructure,rarelyinvolvestentappearancemoldingmethod.Thispaperfocusesonporousscaffoldporestructureandshapeandthepreparationmethodofinnerlink,accordingtoourunderstandingoftheresultingfromtheholeandshapeformingtwolevelsontissueengineeringporousscaffoldspreparationmethodsandtechnologysystematicallysummarized,classifiedandanalyzed.
1.Thepreparationoftissueengineeringscaffoldsrequirementandstructurelevel
Porousscaffoldsintissueengineeringhavetheeffectofextracellularmatrix,isabionicstructureandfunctionofextracellularmatrix.Inadditiontotheinjectablematerials,mostofthetissueengineeringbracketmustbemadeintoporousscaffoldsinadvance.Thisreviewfocusesonporousscaffolds.Poroustissueengineeringscaffoldneedtomeetthefollowingrequirements:
Goodbiocompatibility,whichhasnoobviouscytotoxicity,inflammationandimmunerejection;
Suitablebiodegradableabsorbent,whichcorrespondstoacell,tissuegrowthrateofthedegradationoftheabsorptionrate.Suitableporesize,highporosityandconnectedporeconfiguration,tofacilitatethecultivationofalargenumberofcells,thegrowthofcellsandtissues,theformationofextracellularmatrix,transportofoxygenandnutrients,metabolitesofexcretionandthebloodvesselsandnervesofthegrowth;
Specific3dshapetoobtaintherequiredshapeoftissuesororgans;
Highsurfaceareaandsurfacephysicalandchemicalpropertiesappropriateforcelladhesion,proliferationanddifferentiation,aswellastheloadgrowthfactorssuchasbiologicalsignalingmolecules;
Matchthemechanicalpropertiesofembeddedpartsstructurestrength,andmicroenvironmentinvivobiomechanicstomaintainstructuralstabilityandintegrity,aswellasimplantedcellsimprovesuitablemicrostressenvironment.
Porousscaffoldtissueengineeringlevelofporestructurehasfoursize:
anatomicalshapeandsize,bigporesize,thesizeoftheholewall,internalfinestructuresizeofholewall.Lookfromthepreparation,largeholesize,holesize,holewallinnermicrostructuredependsontheholemethod,andtheanatomicshapeandsizedependsonthemoldingmethod.Therefore,thepreparationoftissueengineeringscaffoldsareusuallydividedintoholesandshapeformingtwolevels,bothisessential,togethertomeettherequirementsofsystemsupport.Therefore,tissueengineering,thepreparationofporousscaffoldsistherearetwomainproblemsneedtosolve,namelygetconnectedtotheporousstructureandtherightshape.
2.Theporousscaffoldoftissueengineeringtoholemethodandtechnology
Porousscaffoldoftissueengineeringholeshapeismainlyconnectedwithporousspongeorfoam,fiber,tubularstructure,etc.Three,accordingly,theholemethodandtechnologyisalsoeacharenotidentical.
2.1fiberscaffolds
Tissueengineeringscaffoldsisfirstusedinthestudyofoneofsubstituteofextracellularmatrix,mainlybythePGAoritscopolymerandothercrystallinepolymerfibers.Coatedfabrictofabricheattreatmentoruseorsolutionmethod,canmakethephysicallinkisformedbetweenadjacentfibers,sothatthefiberscaffoldstability,withstandvoltage.Fiberscaffoldbyusingcavitydieeasilymadeintovariousshapes,havebeensuccessfullyusedincartilageandotherfieldoftissueengineering.Lackofscaffoldsinporosityandporesizeisnoteasytocontrol,alsonoteasytoseparateregulation.
2.2porousfoamorspongescaffold
Porousfoamorspongescaffoldtoholemethodsmainlyincludeparticleinducedholemethod,thethermalinducedphaseseparation,gasfoamingandsinteredmicrospheremethod,etc.
2.2.1particleholemethod
Particleholemethodreferstothefirsttissueengineeringmaterialsandholeagentmadeuniformmixtureofparticles,andthenusethedifferentsolubilityorvolatile,willcausetheporeparticleremoval,occupiedspaceintoporesandparticles.Particlescancauseholeagentwithsodiumchloride,sodiumcitrateandsodiumtartratewatersolubleinorganicsaltorsugarparticles,paraffinoriceparticlesisalsoavailable.Themostcommonlyusedmethodistouseinorganicsaltsolubleinwaterandinsolubleinorganicsolvents,polymers,solubleinorganicsolventandinsolubleinwater,thepolymersolutionbysolventcastingmethod/sandpouringthemixtureintoamembrane,andthenleachingparticleporousscaffolds.Thelawisoftenreferredtoassolventcasting/particulateleaching4method,modifiedbyMikosetcasafiberlinkmethod,solventcasting/particulateleachingofporousscaffoldspreparedbyeasytoformadenselayer,whenifcastaftervibrationunceasinglytomostofsolventevaporation,andcanpreventtheparticlesedimentation,inhibittheformationofsurfacelayer.
Particlestoholemethodissimple,wideapplicability,easyindependentregulation,porosityandporesizeisagenericmethod,hasbeenwidelyused,buttoholewhenoftenneedtoorganicsolvents.
2.2.2phaseseparation/freezedrying
Wasusedtoprepareporousscaffoldoftissueengineeringphaseseparationreferstothepolymersolution,emulsion,orhydromelatlowtemperaturefreezing,frozenintheprocessofphaseseparation,formingrichsolventphaseandpolymerphase,andthenbyfreezedryingmethodtoremovesolventtoformaporousstructure.Therefore,phaseseparationandoftenreferredtoasthefreeze-dryingmethod,accordingtothesystemconfigurationcanbesimplydividedintodifferentemulsionfreeze-dryingmethodoffreezedryingmethod,solutionandwatergelfreezedrying.
Whangetcwillfirstemulsionfreeze-dryingmethodusedinthepreparationoftissueengineeringporousscaffolds.Willwaterwithpolymersolutionhomogenizationiswater-in-oilemulsion,andcastingintothemould,freeze-dryingremovalwaterandsolvent,porousscaffolds.Solventevaporationwillshapeconnectedtotheporestructureofporesurfacearea.Porestructureswerethemaininfluencingfactorsofoil-waterratio,polymermolecularweight.Themethodtoavoidthehightemperature,whichisbeneficialtogrowthfactorbiologicalactivemoleculessuchasproteinsordifferentiationfactorisintroducedandcontrolrelease,largespecificsurfacearea,easytooperate,butthesmallholesize.
Solutionfreezedryingmethodforpreparationofporousscaffolds,thescaffoldholestendtobesmallsize,Nambyfreezingprocessparametercontrolandthepreparationoftheholesizemorethanboldeffectusingporousscaffolds,foundtheholesizewerethemaininfluencingfactorsofsolutionconcentration,freezingrateandfrozentemperaturegradient,etc.
Thegelatinandalginateandchitosanhydrogelbyfreezedryingcanalsobemadeporousscaffolds.Hydrophilichydrogelporousscaffoldsinfluidstrengthdegradationintheenvironmentisaworthyproblem,usuallyneedtocompositewithothermaterials.Phaseseparationoftenfreezedryingholesizeslantssmall,butthelawtoavoidthehightemperature,thusgottheattentionoftheresearchers.
3.Theengineeringporousscaffoldsshapeformingmethodsandtechnologies
Tissueengineeringporousscaffoldspreparationmethodsandtechnology,themorecommittedtoholemethodandporestructure,andconcernedaboutthebracketshapeformingmethodisrelativelysmall,reportedintheliteraturetofilm,cylindrical,cubestentsinsimpleshapes.Andmoreapplicationintissueengineeringistomatchaspecifictissueororganhascomplicatedshapeof3dporousscaffolds,andstentshapeformingmethodsandtechnologiesisalsoanimportantaspectofthepreparationofporousscaffolds.
Generally,theporousscaffoldsappearancemoldingmethodsaremainlymanualmoldingandmolddesign.Particleleachingsolventcastingm
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