傳統手工製作髕骨韌帶承重式小腿義肢承筒，需要複雜的石膏模型編修過程，其製作品質取決於義肢師的手藝。模型編修形狀、位置、編修量皆不易量化，修模的外型與位置仰賴著義肢師的經驗，一名專業的義肢師需要學理知識和大量的實作經驗。
本研究開發一套設計小腿義肢承筒專用的界面系統，透過圖示化的介面與簡單的操作流程，讓非專業的義肢師也能設計出品質穩定，且符合使用者需求的義肢承筒。本介面系統使用Microsoft Visual Studio 2010 之MFC應用程式以及OpenGL函式庫做為開發工具，運用物件導向程式設計的概念進行介面系統設計。以圖示化的設計系統介面讓使用者快速直覺的設計承筒模型。此承筒模型儲存為STL檔，接著以快速成型機(Rapid Prototyping，RP)製作成RP承筒模型後，交由義肢師製作PP承筒並裝配成義肢。製作過程保留了原始殘肢的資料與承筒模型的資料，以提供使用者改善承筒的依據與追蹤殘肢的變化。
小腿義肢承筒之懸吊系統的功用為將承筒固定在殘肢上，對於使用者穿戴行走時的安全性有很大的影響。本研究研發了一個設計懸吊外型的方法，藉以取代手工製作懸吊系統之過程。
經由案例實作與行走時殘肢壓力量測，證明本研究之軟體所設計出的小腿義肢承筒是可行的，案例病患穿戴後即可行走。在小腿殘肢耐壓區與非耐壓區之壓力表現均合乎預期，而懸吊系統在行走時亦有發揮其固定的功能。

Traditional manual method of patella tendon bearing (PTB) sockets need complex shape modifications of a plaster mold during the fabrication process. The product quality of sockets depends on the skills and experience of a prosthetist. This conventional plaster-based process manufactures excellent fitting sockets. The manual skills process also produces bad fitting sockets from case to case, resulting in user dissatisfaction from a poor quality prosthesis. To overcome manual method drawbacks, this research develops a novel interface system for the transtibial sockets design.
The socket design system developed in this study was based on the application programming interfaces of Microsoft Visual Studio 2010 MFC application program and OpenGL. With the concept of object-oriented programming, the user can design a socket model simply by following step by step dialogs using the digitized data of a duplicated stump mold . The output STL data file of a socket model was then transferred to a rapid prototyping (RP) machine to produce a socket mold. And finally a transtibial socket was fabricated by a prosthetist.
The suspension of a transtibial socket is to firmly hold the socket on the stump, and the shape of suspension will greatly influence the safety and comfort of the user. This research developed a method to create the shape of suspension. In addition, the proposed interface system is capable of saving the designed socket model, the digitized stump model, and all the data of socket design steps, so that the socket shape can be easily revised if needed.
The experimental result of a volunteer participant with traumatic amputation demonstrated that the contact pressures on pressure tolerant and sensitive areas were at reasonable and acceptable level. The socket suspension functioned well. And, the amputee walked freely when wearing the prosthetic socket made by using the design interface system developed in this study. The applicability of the proposed transtibial socket design system can be validated if more amputees participate the experiments.

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