本論文發展一套介面系統，來輔助膝下義肢承筒的設計，並利用快速成型機器製作出承筒實體。傳統義肢承筒的製作方式，需用石膏對患者殘肢取模且修改其石膏模型，來設計義肢承筒，整個過程非常費時、繁雜、充滿了不確定性，且極度仰賴義肢師的經驗與技術。利用逆向工程的技術和電腦輔助設計軟體來設計義肢承筒，除了改善了傳統方法的缺點以外，還可以利用電腦輔助分析軟體來分析承筒模型，評估患者穿戴承筒時，殘肢與承筒之間的壓力分佈是否適當。
使用一般泛用型的電腦輔助設計軟體編修殘肢曲面來設計承筒，常常因為自由度太高，需要考慮的參數太多，造成操作上的困擾。本介面系統為設計義肢承筒專用，所以僅需控制少量的參數，即可完成曲面編修的工作。本介面系統藉由C++程式語言與OpenGL繪圖函式庫所開發而成的，可以匯入由雷射掃描儀器所取得的殘肢點資料並重建殘肢曲面模型，經過前處理後，使用者利用系統提供的功能來圈選編修區域且指定最大編修量來編修曲面，編修完成的點資料即為承筒內表面，最後將表面薄殼化成承筒實體模型。輸出檔案到快速成型機器製作承筒，將進一步進行試用及相關實驗。案例研究將說明使用本介面系統來設計義肢承筒，並用快速成型機器來製作出承筒實體是可行的。

The objective of the work reported in this thesis is to develop an interface system that will be used by a prosthetist to design prosthetic sockets easily. The CAD socket models will then be used to fabricate physical sockets on rapid prototyping (RP) machines.
In the traditional method of fabricating prosthetic sockets, it is necessary to use plaster bandages to acquire stump shape and a plaster stump model is then duplicated. The plaster stump model is modified until its shape meets the requirement based on a prosthetist’s expertise. The modified stump model can then be used to manufacture a prosthetic socket. The whole procedure is time-consuming, complicated and full of uncertainty. Introducing reverse engineering technology and computer-aid design software to design prosthetic sockets will not only improve the drawbacks of the plaster-based method but also provide socket models that can be used by finite element analysis software to evaluate the pressure distribution between the stump and a socket. And, the most important goal is using the socket models to fabricate RP sockets.
Because the procedure of using commercial a CAD system to design a prosthetic socket is tedious and complicated, this research developed a prototype interface system that allows a prosthetist easily designing a prosthetic socket. The proposed interface system for designing prosthetic sockets is developed by employing C++ programming language and OpenGL. The modification step is iteratively proceeding until the shape meets the prosthetist’s requirement. The modified stump surface is designated as the inner surface of a prosthetic socket. Using function of shelling, a shell-type of socket is then created. Exporting the socket model to an RP machine, a RP socket can be fabricated and is ready for trial use. A case study demonstrated that prosthetic sockets can be designed by using the prototype interface system and are fabricated by an FDM machine.

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