Optimizing Stiffness in a Multi-Component Prosthetic Foot

优化多组件假足的刚度

• 批准号: 8466785
• 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/8466785
• 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)： 在我们的社会中，肢体缺失是一个日益严重的临床问题，肢体缺失的个体面临着与假肢行走相关的严重发病率。旨在优化假体处方的研究对于将这一人群的功能残疾降至最低至关重要。目前有多种假肢可供选择，它们具有不同的僵硬特性，每种都提供不同的减震能力和能量释放速率。在为肢体丧失患者开假肢处方时，临床医生必须确定哪一只脚具有最适合该患者特定功能能力和目标的僵硬特征。提高优化假肢刚度的能力，以更好地匹配每个个体的功能能力和目标，将极大地促进假肢的临床实践，从而提高失去肢体的个体的功能。因此，本研究的主要目的是根据失肢患者的运动需要，确定哪种后足和前足僵硬曲线的组合能提供最佳的功能。为了达到这一目标，我们计划：-使用机器人步态模拟器，确定单个后脚和前脚部件刚度对假肢足有效刚度的影响-确定假肢足刚度轮廓的功能范围对水平行走期间的冲击力和负荷率、下肢运动学和动力学以及经胫骨截肢者的能量消耗的影响-确定假肢足几何形状如何与刚度相互作用以提供减震和最佳足部翻转-确定假肢足刚度轮廓的哪些子集在生物力学上对于特定任务的目标是最佳的，包括直立平衡、步态启动和终止，为了支持这些目标和目的，我们已经在VA Puget Sound医疗保健系统的VA RR&D肢体缺失预防和假肢工程卓越中心与密歇根大学人类生物力学和控制实验室之间建立了先前建立的合作关系，以设计和制作一种新型的多组件假肢。这种新型脚部的创新设计可以配置成由不同的部件僵硬程度、位置和方向组成的各种组合，从而可以在步态的整个站立阶段直接检查这些变化对假肢整体僵硬轮廓的影响。可以很容易地制造其他部件来改变结构特征，包括龙骨重叠的存在或不存在、实心或分裂的脚趾和脚跟、脚踝的旋转轴以及在龙骨上方或下方使用泡沫或橡胶缓冲。这一研究项目的结果将直接造福于经历过肢体丧失的普通人群，并为未来假肢开发的创新提供信息。