本研究提出一套簡單易用之膝下義肢承筒設計系統，搭配快速原型(rapid prototyping, RP)技術來製作承筒，改善義肢裝具師在手工修模時，品質之不確定性。本研究使用全接觸式(total surface bearing, TSB)技術取模，取得已受壓之殘肢模型。並於本研究發展的膝下義肢承筒設計系統，使用網格化理論設計承筒，避免編修複雜且不易控制之曲面模型，簡化修模流程，提升承筒品質。
在手工石膏製程中，製作承筒過程需破壞石膏模，若承筒不合使用者需求，需重製承筒時，將很難明確指出前後兩者之差異，如果採用電腦輔助編修，則能有效解決此方面問題。
目前專為義肢承筒編修所開發之輔助軟體相當少，除了少數三維掃描器廠商開發對應的編修軟體外，目前電腦編修仍需借助工程用商業CAD軟體。而少數針對承筒編修之軟體，在編修概念上仍然不若手工般直覺。如何為義肢裝具師開發一套簡單易用的義肢膝下義肢承筒設計系統，是本研究之重要目標。
本系統使用UML物件導向分析方法，了解使用者需求，分析系統架構，接著使用MFC/C++搭配OpenGL來開發視窗程式。本系統可以直接讀取三維掃描器檔案格式，編修過程僅對點資料作處理，在系統畫面上可直接比對殘肢模型與承筒模型差異，由於資料結構與快速原型機相同，搭配簡易之編修功能，即可快速且正確的輸出至快速原型機。
案例研究中，運用本系統設計之承筒，經由義肢裝具師與承筒使用者試用，確實可以方便的設計出合用之膝下義肢承筒，確認此系統之可行性。

This study developed an easily-used system for designing a transtibial socket that will be fabricated by a rapid prototyping (RP) machine. This proposed system is to improve the quality of uncertainty of plaster-based process of fabricating a transtibial socket. In this study, the concept of total surface bearing (TSB) is employed to obtain stump model of an amputee under appropriate pressure. Using TSB stump model, editing complex surface can be avoided, and the quality of sockets can be improved by the simplified design process.
In the plaster-based production process, the plaster stump mold must be destroyed in order to fabricate a prosthetic socket. If a socket should be reproduced, it will be difficult to clearly point out the difference between the previous and the new stump molds. If a proper CAD system can be used, the difficulty of reproducing a socket will easily resolved. Currently, manufacturing RP sockets is not an important issue as a convenient RP service bureau already exits. The lack of an appropriate system for designing transtibial socket is the major barrier. The development of an easily-used transtibial socket design system is required.
This thesis proposed a prototype system that used Unified Modeling Language (UML) to define user requirements and system structures. The MFC/C++ together with OpenGL is then employed to develop a windows application. The scanned data of a TSB stump mold can be conveniently imported. Using the concept of grid-editing algorithm, this system is efficient and flexible to modify the point data of a stump CAD model. A transtibial socket can then be easily designed and transferred to an RP machine to manufacture a physical socket.
To demonstrate the usability of this proposed system, two case studies including a resin-reinforced RP transtibial socket and an RP stump mold for replacing the plaster mold used in plaster-based method were designed and fabricated for a volunteer amputee. The motion analysis and trial use of the prosthetic sockets verified the applicability of this prototype CAD system. Recruiting more amputees to examine and validate this developing system is being arranged.

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