本研究設計製作真空成形工具，取得膝下殘肢模型，再使用光學掃描器掃描殘肢模型取得殘肢數位化點資料，並且以軟體輔助疊合數個相同殘肢之模型點資料，驗證本研究工具取得模型點資料之一致性與穩定性。本研究取模工具對模型形狀之重現性穩定，不必經過複雜的編修即可應用於RP 技術製作膝下義肢承筒。
以往在快速成型在膝下義肢承筒製作時之殘肢模型點資料主要獲得途徑有二：第一，採用傳統手工以石膏繃帶取得之石膏陽模，再以光學掃描系統掃描石膏陽模獲得殘肢模型點資料；此法時間冗長。第二，直接以手持式掃描器直接掃描殘肢獲得殘肢點資料；此法因殘肢晃動及軟組織下垂等因素，點資料後處理耗時，且不客觀。
使用本研究之真空成形工具取模，將義肢穿戴者之膝下殘肢放入乳膠腔體中，乳膠腔體抽真空硬化後，殘肢抽離即可獲得殘肢陰模；接著於此陰模注入聚苯乙烯粒，完成密封並抽真空來快速複製殘肢陽模，代替殘肢作為掃描用途。本研究取模製程，殘肢模型不必經過複雜的編修，即可以快速成型技術製作RP 承筒，供患者穿戴試驗。此高穩定性之殘肢模型點資料取得方法，能有效提昇快速成型在膝下義肢承筒製作上之實用性。

This research focused on the design and fabrication of a vacuum forming tool to produce below-knee stump model that is the basis of using rapid prototyping (RP) technology to fabricate a transtibial socket. The uncertainty of the shape of stump models either created by manual skill or directly scanning stump using a hand-held scanner is to be improved by the prototype of vacuum forming tool proposed in this thesis.
The proposed vacuum forming tool is composed of a vacuum pump, a latex chamber with plastic filling, a latex sleeve, a mandrel, a stack of silicon sand and a set of flexible tubes for the connection of the whole system. The steps of using the vacuum forming tool to produce a stump model include: inserting the below-knee stump into a latex chamber; vacuuming the internal air of the latex chamber under a pressure that the amputee can tolerate and the latex chamber can be solified; a cavity mold of stump shape created by extracting the stump; the negative mold filled with silicon sand and the mandrel inserted; sealing the latex sleeve containing mandrel and sand; connecting the flexible tubes to the mandrel; and then sucking the remaining air in the sleeve. A stump model is then created for the use of scanning process.
The stability and consistency of using this proposed vacuum forming tool to generate the stump model of a specific amputee has been verified by the function of registration of a CAD system. The stump model of a volunteer amputee generated by the vacuum forming tool has been employed to easily design a socket. The socket is then fabricated by using an RP machine and the experiments of motion analysis and trial use of the socket have been implemented.
This study demonstrated that the stable and consistent stump model generated by the vacuum forming tool can be employed to design a socket shape without complicated modification. This result will enhance the applicability of using RP technology in the production of prosthetic devices.

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