臺灣博碩士論文加值系統

本論文針對電磁式定位系統應用於骨折治療與胸腔內視鏡診斷，提出了一套以理論推導、有限元素模擬與實際量測結果建立之系統。
骨折治療電磁式定位系統以一埋於骨釘內螺絲孔位置之線圈來發射磁場，當另一線圈/電磁鐵從骨釘外部接收到此磁場時會產生感應電壓, 根據感應電壓即可判斷出骨釘螺絲孔所在之正確位置。本文以馬克士威方程組為基礎來推導上述系統定位機制之解析方程式，並以有限元素法進行該定位機制之模擬。結果顯示理論計算值與有限元素模擬值均可成功預測實驗值。
胸腔內科診斷電磁式定位系統以一方型發射線圈從胸腔前方(體外)發射磁場，並在胸腔後方(體外)以電磁鐵陣列來感測此磁場，再於胸腔支氣管內視鏡最前端貼附矽鋼片。當內視鏡/矽鋼片進入支氣管內時，會擾動胸腔中的磁場，藉由電磁鐵陣列之感應電壓值變化即可判斷該內視鏡/矽鋼片目前於支氣管內之正確位置。因為骨科與胸腔內科兩者之電磁定位方式類似，據此，本論文修改前述骨科定位之解析方程式與有限元素模擬法來擴展至胸腔內科。結果顯示，有限元素模擬值可成功預測實驗值，但理論推導還須改進。

In this paper, I establish modeling (analytical and finite element analyses) for an electro-magnetic targeting system for interlocking nail surgery (bone-fracture treatment) and en-do-bronchoscopy (lung tumor diagnosis). The modeling works are validated by experimental results.
The targeting system for interlocking nail surgery includes an internal coil and an exter-nal coil/electromagnet. The internal coil is embedded in critical screw-hole of the nail. A cur-rent is applied to the internal coil (which is fixed inside the nail’s screw hole) to generate a magnetic flux. The external coil/electromagnet produce voltage outputs, when receiving the flux. We can analyze the changes of voltage outputs to obtain the location information of the distal screw-hole. To model this, we use Maxwell's equations and finite element analysis. The modeled results show that both analytical and finite element solutions can accurately predict the experimental results.
The targeting system for endo-bronchoscopy includes a square emitting coil, a pick-up electromagnets-array, and a silicon-steel sleeve fixed on a guide sheath of endo-bronchoscope. A current is applied to the emitting coil to generate a magnetic flux. When the en-do-bronchoscope’ guide sheath (with silicon-steel sleeve) travels insides the bronchus, the sil-icon-steel sleeve concentrates the flux. The pick-up electromagnets-array produce voltage outputs, when receiving the concentrated flux. The location information of the en-do-bronchoscope/silicon-steel sleeve in the bronchus can be obtained by analyzing the changes of the voltage outputs. Because the principles of both targeting systems are similar, I modify above analytical and finite element modeling works and apply to the targeting system for endo-bronchoscope. The results show that finite element modeling can accurately predict experimental results, but analytical approach is not completed.

摘要 i
ABSTRACTii
誌謝 iii
目錄 iv
圖目錄 v
表目錄 vii
第一章 緒論 1
1.1 研究動機 1
1.2 文獻回顧 3
1.3 研究方法 7
第二章 骨科治療電磁式定位系統 8
2.1 設計 8
2.2 理論公式推導與有限元素分析 8
2.2.1 理論公式推導 8
2.2.2 有限元素分析 10
2.3 製造方法 14
2.4 測試方法 15
2.5 結果與討論 17
2.5.1 理論公式推導結果 17
2.5.2 有限元素分析結果 21
2.5.3 實驗結果 25
2.5.4 理論公式推導、有限元素分析與實驗結果之比較 28
2.6 本章結論 36
第三章 胸腔內科診斷電磁式定位系統 37
3.1 設計 37
3.2 有限元素分析 38
3.3 製造方法 41
3.4 測試方法 42
3.5 結果與討論 43
3.6 本章結論 49
第四章 總結與未來工作 50
4.1 總結 50
4.2 未來工作 50
附錄一：空間中一磁性材料對磁通量分布之影響 51
參考文獻 55

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