通用脊柱椎弓根钉棒矫形固定系统的设计分析与临床应用

《通用脊柱椎弓根钉棒矫形固定系统的设计分析与临床应用》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、goodabilitytobending-twisting．3Fixedrodholderfromtheflexiblepull-outstrengthintheexperiment：Experimentsshowedthatthemininluln叙edbarpull-ontstrength,thatis，a血edrodholderintheflexibilityofbo也theslidingloadatthetimeof>3300N；thegreatestpull-ontstrength,thatis，slidingfrictionarethemost>8500N．Experiment

2、aldatashowsthattheuseofflexible血edscrew-rodholder嘶m11i曲reliability．Inaddition,thelooseningofthefixedrodtocompletelypulloutthere>5000Nmechanicalgradient,showingthattheholderahi曲degreeofflexibilityinthesafetyandhighflexibility．Sincethepediclescrewpull=outtest：GSSbiggestscrewpull=outstrength,compared

3、、析thCCDScrewdi伍erencewassignificant口<0．001)4Finiteelementanalysisoftest：Physiologicalspinalcurvatureinaccordancewitllfixedpre·bendingrodinthecolumnforceismoreuilifollnstressdistributionanddeformationcausedbythesmaller,closertothebiologicalfixatiom5screwbendingexperiment：thedatafromthetesting,wecal

4、lseethattheinsideofthelateralbendingmomentgreaterthanabout2times．W．hentheexternalloadis40Kg，themaximumlateralbendingmomentM=867．5N．-cm,medialtoturnawayfromtheM；273．4N-cm．Lateralstressisgreaterthanabout2timestheinnerstress，maximumstressinsideo罱145．6Mpa,lateralmaximumstresso=487．0Mpa,theabove-mentio

5、nedlawofmodelstructureandcharacteristicsoftestmatch,andabeRerviscositymaterialselasticcharacteristics．6theoverallfatiguetest：datafromthetest,inthefatiguetest,whenthemodelofckculationformorethan10milliontimes，nomodelisanydamage，modelnolooseningoftheconnectionsite．Second,Clinicalapplicationoftheresu

6、lts：186easesofpatientsinthisgrouphavebeenacompletefollow-uptime舶m12to30months，anaverageof13monthsfollow-upresultsofthediseaseareasfollows：Cervicalspinalstenosisand14casesofcervicalspineinstability,intraoperativeandpostoperativeX-raycervicalspinelateralphotoshowsthelocationofthepediclescrew,andafix

7、edandreliable，non-loosening．Atlantoaxialinstability,cervicalspinefracture—dislocation：16patients，18pre—operativevertebralheightcompression76．6％4-12．3％，after93．5％4-14．3％口<0．001)，significantlyreducetherestorationof