本研究配合使用快速成型(Rapid Prototyping, RP)製作承筒，並利用不飽和聚酯樹脂層(Unsaturated Polyester Resin, UPR)當外層加強承筒強度，防止在穿戴承筒時沿著開口處斷裂。模擬膝下承筒使用的情況，利用田口實驗設計方法之L18直交表配合ASTM D790三點式彎曲強度測試法製作RP與UPR之複合材料試片。配合使用MTS萬能試驗機測試材料之三點式彎曲強度。
L18水準組合直交表中影響彎曲強度的因子包括RP材料、RP厚度與UPR層數。依變異數分析結果，RP材料與UPR樹脂層的組合試片中，UPR的襪套層數與RP材料對彎曲強度與彎曲模數影響較大。雖然最大彎曲強度為實驗的主要目標。但以最大彎曲力量為目標分析，更能符合膝下承筒實際受力的情況。UPR的襪套層數對最大彎曲力量影響最大，也就是UPR厚度越厚可使承筒不易缺角或斷裂，RP的材料與厚度則影響不顯著。
依實驗結果分析得到結論:依照最大彎曲強度與最大彎曲力量值選擇厚度薄的ABS M30當RP材料，以縱向成型並使用7層襪套製作UPR義肢承筒，其強度比傳統手工UPR承筒強。利用運動分析與實際試用驗證樹脂強化承筒的應用狀況，長期的試用與耐久度測試正在進行中。

This research aimed to use rapid prototyping (RP) technology to manufacture prosthetic socket, which is then reinforced by coating unsaturated polyester resin (UPR) layers to prevent breakage at the proximal brim of a socket while wearing the prosthesis. To simulate the use of transtibial socket, a type of specimen to determine the flexural strength is designated based on ASTM D790 standard. Similar to resin-reinforced RP socket, the specimens for three-point bending test are composed of an RP layer and a UPR layer. Since there are several parameters that affect the strength of test specimens, Taguchi experimental method was employed to reduce test runs by choosing L18 orthogonal array. To implement the three-point bending test according to ASTM D790 standard, an MTS universal testing machine was used in this study.
The factors that affect the flexural strength include RP material, thickness of the RP layer and thickness of UPR layer coating, which are then combined with appropriate levels to form L18 orthogonal array. In the result of analysis of variance (ANOVA) based on the experimental data, the factors of UPR layers and RP materials affect the flexural strength more than RP thickness. Although the maximum flexural strength of the experiments is the main objective, the maximum flexural force will be more practical data to meet the actual force applied condition on a transtibial socket. The analysis result also showed that UPR layers is the most influenced factor on the maximum flexural force. In other words, the thicker the UPR layers of a socket, the more difficultly broken the prosthetic socket. And, the RP material and its thickness do not significantly affected flexural force.
The study concluded that the parameters of vertical RP forming direction, thin ABS M30 RP material and seven-sock-layer UPR were chosen as the flexural strength and flexural force of test specimen based on that combined factors is larger than that of traditional UPR socket. Using the chosen parameters, a resin-reinforced transtibial socket was fabricated for a volunteer amputee. The motion analysis and trial use of the prosthetic socket verified the applicability of resin-reinforced socket. Long-term trial use and durability test are underway.

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