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首页> 外文期刊>Journal of prosthetics and orthotics: JPO >A Variable-Impedance Prosthetic Socket for a Transtibial Amputee Designed from Magnetic Resonance Imaging Data
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A Variable-Impedance Prosthetic Socket for a Transtibial Amputee Designed from Magnetic Resonance Imaging Data

机译：根据磁共振成像数据设计的用于胫骨截肢者的可变阻抗假体插座

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摘要

This article evaluates the design of a variable impedance prosthetic (VIPr) socket for a transtibial amputee using computer-aided design and manufacturing (CAD/CAM) processes. Compliant features are seamlessly integrated into a three-dimensional printed socket to achieve lower interface peak pressures over bony protuberances by using biomechanical data acquired through surface scanning and magnetic resonance imaging techniques. An inverse linear mathematical transformation spatially maps quantitative measurements (bone tissue depth) of the human residual limb to the corresponding prosthetic socket impedance characteristics. The CAD/CAM VIPr socket is compared with a state-of-the-art prosthetic socket of similar internal geometry and shape designed by a prosthetist using conventional methods. An active bilateral transtibial male amputee of weight 70 kg walked on a force plate-embedded 5-m walkway at self-selected speeds while synchronized ground reaction forces, motion capture data, and socket-residual limb interface pressures were measured for the evaluated sockets. Contact interface pressure recorded (using Teksan F-Socket? pressure sensors) during the stance phase of several completed gait cycles indicated a 15% and 17% reduction at toe-off and heelstrike, respectively, at the fibula head region while the subject used a VIPr socket in comparison with a conventional socket of similar internal shape. A corresponding 7% and 8% reduction in pressure was observed along the tibia. Similar trends of high-pressure reductions were observed during quiet single-leg standing with the VIPr socket in comparison with the conventional socket. These results underscore the possible benefits of spatially varying socket wall impedance based upon the soft tissue characteristics of the underlying residual limb anatomy.
机译：本文使用计算机辅助设计和制造（CAD / CAM）流程评估用于胫骨截肢者的可变阻抗假体（VIPr）插座的设计。通过使用通过表面扫描和磁共振成像技术获取的生物力学数据，将符合要求的功能无缝地集成到三维打印插座中，以实现比骨突起低的界面峰值压力。逆线性数学变换在空间上将人体残肢的定量测量值（骨骼组织深度）映射到相应的假体承窝阻抗特性。将CAD / CAM VIPr插座与假肢使用常规方法设计的，具有相似内部几何形状和形状的最新假肢插座进行比较。体重为70 kg的活跃的双侧胫骨男性截肢者以自行选择的速度在嵌有力板的5 m人行道上行走，同时对评估的插座测量了同步的地面反作用力，运动捕获数据和插座残余肢体界面压力。在几个完成的步态周期的站立阶段记录的接触界面压力（使用Teksan F-Socket™压力传感器）表明，腓骨头部区域的脚趾移开和脚后跟打击分别降低了15％和17％。 VIPr插座与内部形状相似的传统插座相比。沿胫骨观察到相应的压力降低了7％和8％。与传统插座相比，使用VIPr插座在安静的单腿站立过程中观察到了类似的高压降低趋势。这些结果强调了基于下面的残余肢体解剖结构的软组织特征在空间上改变窝壁阻抗的可能益处。

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