惯性载荷对截肢患者残肢/接受腔界面应力的影响研究  

Inertial Effects on Interface Pressure Between Prosthetic Socket and Residual Limb

作　　者：贾晓红[1] 张明[2] 王人成[1] 樊瑜波[3] 

机构地区：[1]清华大学摩擦学国家重点实验室智能与生物机械分室,北京100084 [2]香港理工大学复康科技中心 [3]四川大学建筑与环境学院生物力学所,成都610065

出　　处：《生物医学工程学杂志》2005年第3期468-471,共4页Journal of Biomedical Engineering

基　　金：国家自然科学基金资助项目(50305013);ReseachGrantCouncilofHK资助项目(Polyu5200/02E)

摘　　要：接受腔/残肢界面压力分布特征是假肢优化设计的基础,传统的有限元模型只限于静态分析,不符合实际情况。本文以小腿截肢患者为研究对象,建立了三维非线性有限元模型,给出了一个步态周期内残肢界面压力的变化规律,并对惯性载荷的影响进行了定量比较。结果表明:界面压力主要分布在髌韧带、胫骨内外侧和窝区,一个平地正常速度行走的步态周期内,站立相压力变化呈双峰蝶形,惯性载荷引起的平均压力幅值变化为8.4%;而在摆动相压力幅值变化高达20.1%,并且变化规律相反。行走过程中惯性载荷的影响不能忽略。A quantitative understanding of interface pressure distribution between prosthetic socket and residual limb is fundamental for an optimal design of prosthesis. Most of traditional finite element （FE） models were static. In this paper a 3-D nonlinear finite element model was developed according to the data of one transtibial amputee. The interface pressures at residual limb were predicted, and the effect of inertial loads was investigated quantitatively. The results show that interface pressures were mainly distributed at patella tendon, lateral tibia, media tibia and popliteal depression regions. Interface pressure had the similar double-peaked waveform in stance phase. The average difference in interface pressure between the two cases with and without consideration of inertial loads was 8. 4% in stance phase, while it was up to 20. 1% in swing phase with considerably different change trend. It is found that inertial effects during walking can not be ignored.

关 键 词：惯性载荷 截肢 残肢 接受腔 界面应力 假肢 

分 类 号：R687.5[医药卫生—骨科学] R318.17[医药卫生—外科学]