人工耳蜗术后力学特性改变对残余听力影响分析.pdf

人工耳蜗术后力学特性改变对残余听力影响分析.pdf

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时间:2020-03-23

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1、第38卷第6期仪器仪表学报Vol38No62017年6月ChineseJournalofScientificInstrumentJun.2017Mechanicaleffectsofcochlearimplantsonresidualhearing1122NiGuangjian,AliceA.Halpin,LiYing,LiuHaihong(1.InstituteofSoundandVibrationResearch,UniversityofSouthampton,SouthamptonS

2、O171BJ,UK;2.DepartmentofOtolaryngologyHeadandNeckSurgery,BeijingChildren′sHospital,CapitalMedicalUniversity,BeijingKeyLaboratoryforPediatricDiseasesofOtolaryngology,HeadandNeckSurgery,BeijingPediatricResearchInstitute,BeijingChildren′sHospital,Capita

3、lMedicalUniversity,Beijing100045,China)Abstract:Cochlearimplantisasurgicallyimplantedelectronicdevicethatcanprovideasenseofsoundtoapersonwhoisseverelyhardofhearing.Theeffectofacochlearimplantonresidual,lowfrequency,hearingiscomplexandnotwellunderstoo

4、d.Thisresearchfocusesonchangesofthecochlearmechanicsduetoacochlearimplantbycomparingthebasilarmembrane,BM,responsebeforeandaftertheimplantationusingacomputationalmodelofthecochlea.Inthemodel,cochleaimplantswereintroducedintothelowercochlearfluidchamb

5、erandtheactiveamplificationprocessofthecochlearisnotconsidered,sinceapassivecochlearmodelwhoseresponsedoesnotdependonstimuluslevelcanreasonablywellrepresentthecochleaforsubjectswithhearingimpairment.Theresultsforthebasilarmembranevelocityshowthatthev

6、olumechangeinthefluidchambersduetotheimplanthasalittleeffect,lessthan3dBatlowfrequencies,onthebasilarmembranevelocity.Amoreextremecondition,inwhichthecochlearimplantisassumedtotouchthebasilarmembraneatsomeorthewholepositionsandthusimpededitsmotion,wa

7、salsostudied.Althoughthereisnotravellingwavepropagatinginthebasalregioninthelattercase,theremainderofthecochleaisstillcoupledtothestapesbytheincompressiblefluid.Thebasilarmembranevelocityatlowfrequenciesisrelativelyunaffectedbytheblockingofthebasilar

8、membranemotioninthebasalregion,althoughtheeffectismoredramaticforexcitationfrequencywhosecharacteristicplaceisclosetotheendoftheimplant.Althoughthisworkdoesnotmodeleveryaspectofthehearinglossaftercochlearimplantationasmeasuredclinically,itdoesprovide

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