Optimizing Stiffness in a Multi-Component Prosthetic Foot

优化多组件假足的刚度

• 批准号: 8894396
• 负责人: Michael E. Hahn
• 金额: --
• 依托单位: VA PUGET SOUND HEALTHCARE SYSTEM
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8894396
• 关键词: Activities of Daily Living; Amputation; Amputees; Ankle; Biomechanics; Blood Vessels; Caring; Characteristics; Clinical; Collaborations; Consumption; Development; Diabetes Mellitus; Disease; Employee Strikes; Engineering; Equilibrium; Face; Financial compensation; Future; Gait; General Population; Generations; Geometry; Goals; Healthcare Systems; Heel; Human; Incidence; Individual; Joints; Kinetics; Knee; Laboratories; Limb structure; Lower Extremity; Measures; Mechanics; Michigan; Morbidity - disease rate; Performance; Phase; Population; Positioning Attribute; Prevention; Process; Prosthesis; Research; Research Project Grants; Robotics; Rubber; Secondary to; Shapes; Shock; Societies; Solid; Speed; System; Time; Toes; Torque; Trauma; United States; Universities; Veterans; Walking; absorption; base; clinical practice; design; experience; foot; functional disability; improved; innovation; kinematics; meetings; novel; pressure; prototype; sound

DESCRIPTION (provided by applicant): Lower limb loss is a growing clinical problem in our society and individuals with limb loss face significant morbidity related to walking with a prosthetic limb. Research aimed at optimizing prosthetic prescription is vital in order to minimize functional disability in this population. There is a wide selection of prosthetic feet available today that possess a variety of stiffness characteristics each providing different shock absorbing capacity and rate of energy release. When prescribing a prosthetic foot for an individual with limb loss, the clinician must determine which foot will have stiffness characteristics optimally suited for that individual's particular set of functional abilities and goals. Improving the ability to optimize prosthetic foot stiffness to better match the functional abilities and goals of each individual would greatly enhance the clinical practice of lower limb prosthetics and therefore enhance the function of individuals with lower limb loss. Therefore the primary objective of this research is to determine what combination of hindfoot and forefoot stiffness profiles provides optimal function according to the performance needs of individuals with lower limb loss. To meet this objective, we plan to: - Determine the effects of individual hindfoot and forefoot component stiffness on the effective stiffness of the prosthetic foot, using a robotic gait simulator - Determine the effects of a functional range of prosthetic foot stiffness profiles on impact forces and rate of loading during level walking, lower limb kinematics and kinetics, and energy consumption in transtibial amputee subjects - Determine how prosthetic foot geometry interacts with stiffness to provide shock absorption and optimal foot rollover - Determine which subsets of prosthetic foot stiffness profiles are biomechanically optimal for task-specific goals including upright standing balance, gait initiation and termination, and level walking at different speeds In support of these objectives and aims, we have cultivated a previously established collaboration between the VA RR&D Center of Excellence for Limb Loss Prevention and Prosthetic Engineering at the VA Puget Sound Health Care System and the Human Biomechanics and Control Laboratory at the University of Michigan to design and prototype a novel multi- component prosthetic foot. The innovative design of this new foot can be configured in a myriad of combinations made of different component stiffness levels, positions and orientations to allow direct examination of the effect of these changes on the overall stiffness profile of the prosthetic foot throughout the stance phase of gait. Additional components can be readily produced to change structural features, including the presence or absence of keel overlap, solid or split toes and heels, rotational axes at the ankle, and the use of foam or rubber cushioning above or below the keels. The results of this research project will directly benefit the portion of the general population that has experienced lower limb loss, and inform future innovations in prosthetic foot development.

描述（由申请人提供）： 下肢缺失是我们社会中一个日益严重的临床问题，肢体缺失者面临着与使用假肢行走相关的严重发病率。研究旨在优化假肢处方是至关重要的，以尽量减少在这一人群的功能残疾。目前有多种可供选择的假脚，它们具有各种刚度特性，每种刚度特性都提供不同的减震能力和能量释放速率。当为肢体缺失的个体开假足处方时，临床医生必须确定哪只脚将具有最适合该个体的特定功能能力和目标的刚度特性。提高优化假足刚度的能力以更好地匹配每个个体的功能能力和目标将极大地增强下肢假肢的临床实践，并因此增强具有下肢丧失的个体的功能。因此，本研究的主要目的是确定后足和前足刚度配置文件的组合提供最佳功能，根据个人的下肢损失的性能需求。为了实现这一目标，我们计划：- 使用机器人步态模拟器确定单个后足和前足部件刚度对假足的有效刚度的影响-确定假足刚度轮廓的功能范围对水平行走期间的冲击力和加载速率、下肢运动学和动力学的影响，和能量消耗-确定假脚几何形状如何与刚度相互作用以提供减震和最佳的脚翻转-确定假脚刚度分布的哪些子集对于特定任务目标（包括直立站立平衡）是生物力学最佳的，步态起始和终止以及以不同速度水平行走为支持这些目标和目的，我们已经培养了VA RR和D VA Puget Sound医疗保健系统的肢体损失预防和修复工程卓越中心以及密歇根大学的人类生物力学和控制实验室设计和制作了一种新颖的原型多部件假足。这种新脚的创新设计可以以由不同的部件刚度水平、位置和取向构成的无数组合来配置，以允许直接检查这些变化对整个步态的站立阶段的假脚的整体刚度轮廓的影响。可以容易地生产附加部件以改变结构特征，包括龙骨重叠的存在或不存在、实心或分裂的脚趾和脚跟、脚踝处的旋转轴以及在龙骨上方或下方使用泡沫或橡胶缓冲。该研究项目的结果将直接受益于经历过下肢丧失的普通人群，并为未来的假足开发创新提供信息。