四肢骨折或脊椎病變的術後治療通常需以護具固定患部加速復原，但傳統護具材質如玻璃纖維石膏更換不易、不透氣，現有熱塑板則是無法伏貼身形等缺點。積層製造客製化護具相對於一般護具因為合身具有相似或更佳的固定性效果，更具有透氣、輕薄、堅固、服貼身形、換藥方便等等優點。
近年已有可同時列印多種材料的多材積層製造(Multiple Material Additive Manufacturing)技術出現，但是市面上並無專門用於設計多材料積層製造客製化護具的專用軟體。故本研究開發可設計軟硬雙層客製化護具的專用設計軟體，生成可供多材料積層製造技術列印的模型。軟體更結合一般電腦輔助設計(Computer-aided Design, CAD)參數化設計軟體與網格編輯演算法的優點，以處理三角網格的方法降低逆向工程的操作時間，根據專家經驗定義護具的設計參數，例如背架需依據人體解剖特徵設計護具包覆範圍以支持人體軀幹，腕護具則需於不同區域設計不同裕度，以兼具固定性與舒適性。本研究成果嵌入臨床專家經驗開發專用軟體，並以專案檔的形式建立功能性參數，以此開發出可用於設計醫療護具的專用軟體。本研究使用腕護具與短背架作為軟體的實施例，並以問卷調查驗證短背架之有效性，在保有相似固定性的同時具有較佳的舒適度與方便性。

Postoperative treatment of limb fracture or spinal lesions usually requires an orthosis to stabilize the joint movement associated with the fractured bone for speed-up the process of recovery. However, orthosis material such as fiberglass gypsum is usually not ventilated and not easily replaced. Nevertheless, lately orthosis material, thermoplastic plate cannot fit the shape of surface of individual. The 3D-printed customized orthosis has similar or better fixing effect compared to commercial orthosis. It has the advantages of being ventilated, light, reliable, fitting, and convenient using in medical purpose.
In recent years, additive manufacturing technology with multiple materials has been available for printing a variety of materials in one-step manufacture process. However, there is no specific software available on market for designing a customized orthosis that can be printed with multiple materials. Therefore, in this study, we developed a computer-aided design software particular used in design dual-layer orthosis. In order to reduce operation time from the reverse engineering method, we integrate the model created from general computer-aided design software and the base of mesh generating algorithm by using parametric method for processing triangular meshes of the model. Design parameters of the orthosis are set by professional experience accordingly. For example, the low back brace were designed to support human torso, so that the cover area of the back of subject should be according to the anatomical features of the human back. In terms of the wrist brace are designed with many different allowances in different areas to meet both fixation and comfort requirements. In this study, we proposed a professional software with clinical needs embedded. Functions of parameterized project developed in the software allows the users to modified exist or generate a new orthosis model to be used in medical purpose. According to the questionnaire results, the comfort and convenience of customized back brace which is designed by our software is better than commercial short back brace, and both have similar fix performance.

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