Assist-Knee: Energy Harvesting for Sit-to-Stand-to-Sit Transitions

辅助膝关节：收集从坐到站到坐的转换的能量

• 批准号: 10258296
• 负责人: Sarah Chang
• 金额: $ 66.54万
• 依托单位: ORTHOCARE INNOVATIONS, LLC
• 依托单位国家: 美国
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-04-01 至 2023-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10258296
• 关键词: Activities of Daily Living; Address; Age; Ankle; Area; Beds; Biomechanics; Body Weight; Clinical; Clinical Trials; Complex; Conduct Clinical Trials; Contralateral; Development; Devices; Elderly; Evaluation; Feedback; Generations; Harvest; Home; Individual; Intuition; Joints; Knee; Knee Prosthesis; Knee joint; Laboratories; Lifting; Limb structure; Methodology; Motor; Output; Participant; Performance; Periodicity; Phase; Physicians; Population; Positioning Attribute; Potential Energy; Process; Prosthesis; Reporting; Safety; Small Business Innovation Research Grant; System; Test Result; Testing; Update; Upper Extremity; Validation; Walking; base; clinically relevant; commercial application; cost; design; design and construction; experience; home test; light weight; limb loss; meetings; novel; phase 1 designs; phase 1 testing; phase 2 designs; physical therapist; powered prosthesis; prosthesis wearer; prototype; quadriceps muscle; technological innovation; user centered design

PROJECT SUMMARY This SBIR Phase II project will create and evaluate a novel low-tech Energy-Harvesting Knee Prosthesis, or Assist-Knee Prosthesis, capable of helping geriatric individuals with transfemoral limb loss more effectively and safely perform sit-to-stand-to-sit transitions. Transitioning from a sitting to a standing position is much more difficult for an individual with transfemoral limb loss, especially within the geriatric population, due to declining or absent knee and ankle musculature. When rising from a chair, these individuals heavily rely on their contralateral limb and upper limb strength to lift their body weight. Geriatric prosthesis users, who often have marginal and declining strength, could retain their independence if a prosthetic knee was capable of assisting with sit-to-stand-to-sit transitions. Unfortunately, the current designs of most commercially available prosthetic knees do not assist with the sit-to-stand-to-sit transition, a task that is fundamental for normal activities of daily living. The Assist-Knee design harvests the prosthesis user’s potential energy during the stand-to-sit transition and appropriately returns that energy to assist with the sit-to-stand transition. While harvesting energy, Assist-Knee provides a resistive knee extension moment that imitates eccentric contraction of the quadriceps muscles for a controlled stand-to-sit. The return of energy provides knee extension, imitating concentric activity of the quadriceps muscles, for an assisted sit-to-stand. The technological innovation of this design does not require a large motor, battery, or complex system to provide external power for knee extension assist. Our low-cost, lightweight design is an alternative to externally powered prosthetic devices. Since external power is not being added to the system, Assist-Knee is not intended to replicate maximum moment output at the knee but to provide a useful fraction of knee extension moment to assist with initiation of the sit- to-stand transition. The specific aims of this project involve: updating and optimizing the Assist-Knee design based on our successful Phase I findings and with a user-centered design approach that includes biannual meetings with stakeholders, and validating Assist-Knee in daily use with a laboratory and at-home clinical trial. Successful design and implementation of Assist-Knee will enable geriatric individuals with transfemoral limb loss to more easily complete sit-to-stand-to-sit transitions, increase independence by reducing the need for caretaker assistance, and help control the lowering of a user during the stand-to-sit maneuver. The commercial application of Assist-Knee is a low-cost, lightweight prosthetic alternative to assist individuals with transfemoral limb loss within the geriatric population to independently complete activities of daily living.

项目概要 该 SBIR 第二阶段项目将创建并评估一种新型低技术能量收集膝关节假体，或 辅助膝关节假体，能够更有效地帮助患有经股肢体丧失的老年人 并安全地执行从坐到站到坐的转换。 对于经股动脉肢体丧失的个体来说，尤其是在老年人群中，由于 当从椅子上站起来时，这些人严重依赖膝盖和脚踝的肌肉组织。 他们的对侧肢体和上肢的力量来举起他们的体重 老年假肢使用者，他们经常。 力量有限且正在下降，如果假肢膝关节能够保持其独立性 不幸的是，目前大多数市售的设计都无法帮助完成从坐到站到坐的转换。 假肢膝盖不能帮助完成从坐到站到坐的转换，而这是正常活动的基本任务 辅助膝关节设计可收集假肢使用者在日常生活活动中的潜在能量。 站到坐的转变，并适当地返回能量以协助坐到站的转变。 收集能量，辅助膝提供模拟偏心收缩的阻力膝伸展力矩 股四头肌的力量，以实现受控的站立到坐姿 能量的返回提供了膝盖的伸展，模仿。 股四头肌的同心活动，用于辅助坐立本的技术创新。 设计不需要大型电机、电池或复杂的系统来为膝关节伸展提供外部电源 我们的低成本、轻量级设计是外部供电假肢设备的替代方案。 外部动力未添加到系统中，辅助膝并非旨在复制最大力矩 膝盖处的输出，但提供了膝盖伸展力矩的有用部分，以协助开始坐姿 该项目的具体目标包括：更新和优化辅助膝关节设计。 基于我们成功的第一阶段研究结果和以用户为中心的设计方法，包括每年两次 与利益相关者举行会议，并通过实验室和家庭临床试验验证 Assist-Knee 的日常使用情况。 Assist-Knee 的成功设计和实施将使老年人能够跨股肢体 失去更容易完成从坐到站到坐的转换，通过减少对 看护人员协助，并帮助控制用户在站立到坐下的操作过程中的下降。 Assist-Knee 的应用是一种低成本、轻量级的假肢替代方案，可帮助患有经股骨损伤的患者 老年人群中肢体丧失，无法独立完成日常生活活动。