本文選題：椎弓根螺釘內(nèi)固定系統(tǒng) + CT圖像��； 參考：《廣西科技大學(xué)》2013年碩士論文

【摘要】：為了解人體正常腰椎、椎間盤的受力情況以及植入椎弓根螺釘內(nèi)固定系統(tǒng)的腰椎在不同狀態(tài)下的最易斷裂點，利用醫(yī)學(xué)數(shù)字影像生成及編輯軟件Mimics將腰椎L_4-L_5節(jié)段CT圖像進(jìn)行反求生成三維模型、并導(dǎo)入工程設(shè)計軟件UG NX對模型修復(fù)整理，再導(dǎo)入有限元分析軟件Ansys Workbench中進(jìn)行各種不同載荷工況下的分析，得出在不同載荷狀態(tài)下的椎體、椎間盤應(yīng)力云圖與位移云圖，并對結(jié)果進(jìn)行強(qiáng)度校核，為醫(yī)學(xué)提供理論支撐。 研究過程中，首先，利用Mimics將CT斷層掃描圖像重建為人體正常腰椎L_4-L_5節(jié)段三維模型，導(dǎo)入UG并建立包含纖維環(huán)及髓核的椎間盤，模擬了人體腰椎的真實結(jié)構(gòu)。通過UG與Ansys Workbench的無縫接口導(dǎo)入Ansys Workbench中，對模型賦值并進(jìn)行有限元分析，得出人體直立、前屈、左右旋轉(zhuǎn)作用時，正常腰椎的椎體、椎間盤的應(yīng)力云圖及位移云圖。結(jié)果表明，最大位移發(fā)生于L_4椎體前部或椎間盤上表面前部，而小關(guān)節(jié)接觸面由冠狀面轉(zhuǎn)變?yōu)槭笭蠲�，容易遭受�?fù)載的破壞，所以最大應(yīng)力均出現(xiàn)L_4下關(guān)節(jié)突附近，，其中旋轉(zhuǎn)時的28.211MPa為最大。其次，將模型進(jìn)行簡化，利用材料力學(xué)的理論公式對直立時的有限元分析進(jìn)行強(qiáng)度校核，結(jié)果表明，有限元分析結(jié)果接近理論計算結(jié)果，且相對誤差較小，計算結(jié)果可靠，為臨床醫(yī)學(xué)提供理論參考；最后，模擬建立植入椎弓根螺釘?shù)难等S模型并進(jìn)行有限元分析，得到人體直立、前屈、左右旋轉(zhuǎn)作用時的等效應(yīng)力云圖及位移云圖。結(jié)果表明：最大應(yīng)力均出現(xiàn)于螺釘中部，表明植入的椎弓根螺釘可緩解椎體的承載負(fù)擔(dān)，并且可使腰椎變形減小。
[Abstract]:In order to understand the stress of the normal lumbar vertebrae, the intervertebral disc and the most easily broken point of the lumbar vertebrae implanted with the pedicle screw internal fixation system in different states, Using the medical digital image generation and editing software Mimics, the lumbar spine L_4-L_5 segment CT image is inversely generated into the three-dimensional model, and the engineering design software UG NX is introduced to repair the model. Then the finite element analysis software Ansys Workbench was introduced to analyze the vertebral body, intervertebral disc stress cloud and displacement cloud under different load conditions, and the results were checked to provide theoretical support for medicine. In the course of the study, firstly, Mimics was used to reconstruct the CT tomography image into the normal L_4-L_5 segment of human lumbar vertebrae, then introduced into UG and established the disc containing fibrous ring and nucleus pulposus to simulate the real structure of human lumbar vertebrae. Through the seamless interface between UG and Ansys Workbench into Ansys Workbench, the model was assigned and finite element analysis was carried out, and the stress cloud and displacement cloud of normal lumbar vertebra and intervertebral disc were obtained when the body was upright, flexor, and left and right rotated. The results showed that the maximum displacement occurred in the anterior part of the L4 vertebra or the anterior part of the upper surface of the intervertebral disc, while the facet joint contact surface changed from the coronal plane to the sagittal plane, which was liable to be damaged by the load, so the maximum stress appeared near the L4 inferior articular process. The 28.211MPa of rotation is the largest. Secondly, the model is simplified and the strength of the vertical finite element analysis is checked by the theoretical formula of material mechanics. The results show that the finite element analysis results are close to the theoretical calculation results, and the relative error is small, and the calculation results are reliable. Finally, the three-dimensional model of lumbar vertebrae pedicle screw was established and finite element analysis was carried out to obtain the equivalent stress cloud image and displacement cloud image of human body under the action of upright, forward flexion, left and right rotation. The results showed that the maximum stress appeared in the middle of the screw, which indicated that the pedicle screw could relieve the load of the vertebral body and reduce the deformation of the lumbar vertebrae.
【學(xué)位授予單位】：廣西科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：R816.8

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