目前義肢承筒的設計與製造大多數是以手工的方式完成，過程不僅費時，且截肢者的義肢資料也無法保存。因此，利用CAD/CAM軟體的輔助將逆向工程技術導入，籍由掃瞄器和電腦軟體取代殘肢的取模和模型修改，再以CAM軟體規劃後序之製造，可縮短義肢設計中製造石膏陽模的時間。
義肢製造的成功與否，取決於截肢患者穿戴的舒適度，所以殘肢CAD曲面模型的修改在義肢製作中就扮演極重要的角色。本研究提出拘束邊界之曲面編修方法，以設定之拘束邊界作為曲面編修的限制區域，配合以點、線段及區域等三種最大變形目標的曲面編修模式，讓曲面的編修更能配合殘肢的各種形狀。應用到義肢的設計上，對於殘肢曲面模型在受壓區及非受壓區的編修，用拘束邊界來固定編修區域，再視殘肢的各部位採取不同的曲面編修模式，得到最適當的曲面編修結果。
拘束邊界和編修模式的選取需要專精於義肢設計的義肢師來執行。為協助義肢師確切掌握殘肢曲面模型之編修，所以建立容易操作的義肢設計雛型系統，包括建模及曲面編修的功能。本研究提出之曲面修改方法，經由實際案例驗證後，可作為修改殘肢曲面模型之功能模組，將可提升殘肢設計自動化系統之完整性。

Presently, the design and fabrication of a prosthetic socket entirely depends on the manual techniques of prosthetist. The procedure is not only time-consuming, but the socket information can not be preserved. Therefore, reverse engineering technology is used to aid the design and fabrication process of prosthetic socket. The model of residual limbs is obtained by using 3D laser scanner and modified by CAD software. If the process of fabricating prosthetic socket can make more use of CAD model of residual limb, the time-cost of fabricating plaster model would be saved.
Modifying CAD surface model of residual limb plays an important role in fabricating prosthesis, if computer-aided systems are to be employed in the fabrication of prosthetic sockets. In this research, an algorithm is proposed to modify the constrained boundary areas of CAD surface model. And the surface regions with constrained boundary can be modified by choosing appropriate modification modes. During designing the prosthetic socket, the pressure-tolerant and pressure-relief areas would be recognized as constrained boundary regions. The surface modification algorithm proposed in this study can then be applied.
Based on the expertise of prosthesis design and manufacturing, a prosthetist would designate the constrained areas and proper modification modes to modify the CAD model of residual limb, until the required shape is reached. Therefore, there is a need to develop a prosthetic socket design system that is easier to be used by a prosthetist. The proposed shape modification algorithm can be integrated into the prosthetic socket design system that is capable of constructing modifying CAD modes of residual limbs.

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