Research Engineer/Scientist, Department of Bioengineering, University of Washington, 355061, 3720 15th Ave NE, Seattle, WA, United States.
Professor, Department of Mechanical Engineering, University of Washington, 3900 E Stevens Way NE, Seattle, WA 98195, United States.
Med Eng Phys. 2021 Apr;90:100-106. doi: 10.1016/j.medengphy.2021.03.002. Epub 2021 Mar 4.
Management of socket fit is challenging for people using lower-limb prostheses because of residual limb volume fluctuation throughout the day. Releasing socket pressures during sitting (partial doffing) may help users increase their limb volume after they have undergone volume loss earlier in the day. The purpose of this research was to develop and evaluate a system to allow for quick and easy locking pin and socket panel release during sitting and relock upon standing. The system was to allow the partial doff tether length to be custom set for each user, accomplish release and relock in less than 2.0 s each, require only one hand, and require a finger push force comparable to a push button on a phone. A motor-driven release/relock system (<240 g build weight) housed within the socket adjusts locking pin tether length, and an instrumented ratcheting dial adjusts socket panel position. Three participants with a trans-tibial amputation operated the system properly using one hand. For a partial doff, users preferred a tether length between 5 and 6 cm. All users executed release within 1.5 s and relock within 1.5 s.
由于整天残肢体积波动，下肢假肢使用者的接受腔适配管理具有挑战性。坐着时释放接受腔压力（部分脱开）可能有助于使用者在当天早些时候经历体积损失后增加肢体体积。本研究的目的是开发和评估一种系统，以便在坐着时快速轻松地锁定销和接受腔面板，并在站立时重新锁定。该系统应允许为每个用户自定义设置部分脱开系绳长度，每次释放和重新锁定的时间都小于 2.0 秒，仅需一只手，并且手指推力与手机上的按钮相当。位于接受腔内部的电动释放/锁定系统（<240 克的构建重量）调整锁定销系绳长度，而带仪器的棘轮拨盘调整接受腔面板位置。三名胫骨截肢的参与者使用一只手正确操作了该系统。对于部分脱开，用户更喜欢 5 到 6 厘米的系绳长度。所有用户在 1.5 秒内完成释放，在 1.5 秒内重新锁定。
