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題 名 | 膝下截肢患者殘肢與承套間界面應力分佈之有限元素分析=Finite Element Analysis of the Interface Stresses between the Stump and Socket for a Below-Knee Amputee |
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作 者 | 林志杰; 張志涵; 吳佐禮; 吳柱龍; 廖怡珍; 何浩然; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 21:1 2001.03[民90.03] |
頁 次 | 頁23-30 |
分類號 | 410.1644 |
關鍵詞 | 有限元素分析; 膝下義肢; 界面應力; Finite element analysis; Low-limb prosthesis; Interface stress distribution; |
語 文 | 中文(Chinese) |
中文摘要 | 膝下截肢患者殘肢與義肢承套間界面應力的分佈,在義肢設計是一重要考量。本研究以有限元素分析針對冠狀面探討不同承套形狀對界面應力的影響。受試者接受斷層掃描,擷取殘肢穿戴義肢不受力時之冠狀面幾何形狀,經由影像處理擷取殘肢和承套邊界,以此邊界建立一冠狀面二維網格的模組;移動此模組外側承套,分別往近端、遠端、內側、及外側四方向位移2mm、4mm、6mm、8mm、10mm各得到5個非合適的承套外形,將這些可能不合適模組與合適模組作比較,來觀察殘肢與承套間應力分佈的差異。本研究結果顯示承套冠狀面設計在上下方向對穿戴時位移影響較小,而鬆緊(內外方向)對位移影響較大;從界面應力大小的角度觀察,調整後各組的界面壓力值較原設計的承套均有提高現象,尤其是較緊的設計。但除了較緊組外,其餘調整後同組間的壓力分佈並不會隨調整量的增加而有太大的差異。 |
英文摘要 | Distribution of the interface stresses between the stump and the socket is an important consideration in the prosthetic design and fitting process. By using CT scans, we obtained the coronal plane geometry of the subject's stump with PTB prosthesis but without weight bearing. The stump and socket's boundaries were detected using image processing software to create a frontal two-dimensional mesh model. The lateral liner and socket boundary of the model were shifted with various distances, namely, 2mm, 4mm, 6mm, 8mm, and 10mm in the proximal (P) direction. This shifting was repeated in the distal (D), medial (M) and lateral (L) directions. This approach produced four variable P, D, M, and L groups, and each of these had five different socket sizes in accordance with the five various displacements. This study thus investigated the stress distribution for PTB socket through a plane strain finite element analysis in the frontal section by varying a fitted socket with twenty different sockets' shapes. From the results, it is clear to see that there were little displacement effects for the upward-downward shape change and the tight-loose size changes produced larger displacement effects on frontal socket design. As for the interface stress distribution, all groups produced a higher pressure than the fitted socket (especially on tighter group). But the pressure distribution did not increase with the increasing displacement of shape change for all groups except the tighter group. |
本系統中英文摘要資訊取自各篇刊載內容。