【英文标准名称】:StandardTestMethodforMeasuringFrettingCorrosionofOsteosynthesisPlatesandScrews
【原文标准名称】:测量接骨用板和钉磨蚀的标准试验方法
【标准号】:ASTMF897-2002(2007)
【标准状态】:现行
【国别】:
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:F04.15
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:医疗设备;腐蚀;医学科学;螺钉;试验;板;测量
【英文主题词】:corrosion-surgicalimplants;cracking-stress-corrosion;loadingtests-surgicalmaterials/applications;orthopaedicmedicaldevices-boneplates;orthopaedicmedicaldevices-bonescrews;osteosynthesis;seals;stress-metallicmaterials;testingmethods-surg
【摘要】:Itiswellknownfromexaminationofimplantsafterusethatplatesandscrewsusedforosteosynthesisaresubjectedtometallossduetocorrosionattheplate-screwinterfaces.Oneofthemechanismsofthiscorrosiveattackisfrettingcorrosionduetorelativemotion(micromotion)betweenthescrewheadsandplate-holecountersinks.Itisalsoknownthatreleaseofcorrosionproductsintothetissuessurroundinganimplantmayhaveadverseeffectsonlocaltissueorhavesystemiceffects.Thus,itisimportanttominimizetheamountoftissueexposuretocorrosionproducts.ScrewsandplatesareavailableindifferentconfigurationsinaccordancewithSpecificationsF543andF382.Thistestmethodmaybeusedtoevaluatetheeffectsofdifferentcombinationsofscrewandplatedesigns.Asnewmaterialsanddevicedesignsaredevelopedforuseinthetreatmentoffracturedbones,itisimportanttodeterminetheeffectsthesedevelopmentshaveontheamountofmetallossduetofrettingcorrosion.Thistestmethodprovidesastandardizedscreeningtestforrankingmetalplatesandscrewsintermsofresistancetofrettingcorrosionandfordeterminingtheinfluenceofdifferentsolutionsonfrettingcorrosionrates.Thistestmethodmayalsobeusedtogeneratecorrosionproductseitherforchemicalanalysisoftheproductsorfortestingforbiologicalreactionstocorrosionproductsusinganimalorcellculturemethods.Itiswellknownthatfrettingcorrosionratesdependonnormalloadorpressure,frequency,slidingamplitude,materials,surfacetreatments,andenvironmentalfactors.(4)Therefore,whendeterminingtheeffectofchangingoneoftheseparameters(forexample,materialorenvironment),allothersmustbekeptconstanttofacilitateinterpretationoftheresults.1.1Thistestmethodprovidesascreeningtestfordeterminingtheamountofmetallossfromplatesandscrewsusedforosteosynthesis(internalfixationofbrokenbones)duetofrettingcorrosioninthecontactareabetweenthescrewheadandtheplateholecountersinkarea.Theimplantsareusedintheformtheywouldbeusedclinically.Themachinedescribedgeneratesarelativemotionbetweenplatesandscrewswhichsimulatesonetypeofmotionpatternthatcanoccurwhenthesedevicesareusedclinically.1.2Sincetheenvironmentalandstressconditionsusedinthistestmethodmaynotbeidenticaltothoseexperiencedbyboneplatesinthehumanbody,thistestmethodmayproducefrettingcorrosionratesthatarelowerorhigherthanthoseexperiencedinpractice.Therecommendedaxialloadof400Nwasselectedasbeinginarangewheretheamountoffrettingcorrosionisnotsensitivetosmallchangesinaxialload(1).Thecombinationoftherecommendedloadandangulardisplacementaresuchthatameasurableamountoffrettingcorrosionofsurgicalalloysoccursinacomparativelyshortperiodoftime(7to14days).(Refs1-3)1.3Thedeviceisdesignedsoastofacilitatesterilizationofthetestspecimensandtestchamberstopermittestingwithproteinaceoussolutionsthatwouldbecomecontaminatedwithmicrobialgrowthinnonsterileconditions.1.4Thespecimensusedcanbestandardosteosynthesisimplantsorcanbematerialsfabricatedintotheappropriateshapes.1.5Thistestmethodmaybeusedfortestingthefrettingcorrosionofmetalplatesandscrewsofsimilarordifferentalloycompositions,oritmaybeusedfortestingthefrettingcorrosionofmetal-nonmetalcombinations.Thistestmethodmayalsobeusedforwearordegradationstudiesofnonmetallicmaterials.Thistestmethodmaybeusedasascreeningtesttorankthecorrosivitiesofsalineorproteinace......
【中国标准分类号】:C35
【国际标准分类号】:11_040_40
【页数】:5P.;A4
【正文语种】: