Olsen J, Day S, Dupan S, Nazarpour K, Dyson M
Intelligent Sensing Laboratory, School of Engineering, Newcastle University, UK.
National Centre for Prosthetics and Orthotics, Strathclyde University, UK.
Can Prosthet Orthot J. 2022 Jul 20;5(2):37963. doi: 10.33137/cpoj.v5i2.37963. eCollection 2022.
Existing trans-radial prosthetic socket designs are not optimised to facilitate reliable myoelectric control. Many socket designs pre-date the introduction of myoelectric devices. However, socket designs featuring improved biomechanical stability, notably longitudinal compression sockets, have emerged in more recent years. Neither the subsequent effects, if any, of stabilising the limb on myoelectric control nor in which arrangement to apply the compression have been reported.
Twelve able-bodied participants completed two tasks whilst wearing a longitudinal compression socket simulator in three different configurations: 1) compressed, where the compression strut was placed on top of the muscle of interest, 2) relief, where the compression struts were placed either side of the muscle being recorded and 3) uncompressed, with no external compression. The tasks were 1) a single-channel myoelectric target tracking exercise, followed by 2), a high-intensity grasping task. The wearers' accuracy during the tracking task, the pressure at opposing sides of the simulator during contractions and the rate at which the limb fatigued were observed.
No significant difference between the tracking-task accuracy scores or rate of fatigue was observed for the different compression configurations. Pressure recordings from the compressed configuration showed that pressure was maintained at opposing sides of the simulator during muscle contractions.
Longitudinal compression does not inhibit single-channel EMG control, nor improve fatigue performance. Longitudinal compression sockets have the potential to improve the reliability of multi-channel EMG control due to the maintenance of pressure during muscle contractions.
现有的经桡侧假肢接受腔设计并未优化以促进可靠的肌电控制。许多接受腔设计早于肌电设备的出现。然而，近年来出现了具有改善的生物力学稳定性的接受腔设计，特别是纵向压缩接受腔。尚未有关于稳定肢体对肌电控制的后续影响（若有）以及应用压缩的具体方式的报道。
12名身体健全的参与者在佩戴纵向压缩接受腔模拟器的三种不同配置下完成两项任务：1）压缩状态，压缩支柱置于感兴趣肌肉上方；2）缓解状态，压缩支柱置于记录肌肉的两侧；3）未压缩状态，无外部压缩。任务包括：1）单通道肌电目标跟踪练习，随后是2）高强度抓握任务。观察了佩戴者在跟踪任务中的准确性、收缩时模拟器相对两侧的压力以及肢体疲劳的速率。
不同压缩配置下的跟踪任务准确性得分或疲劳速率未观察到显著差异。压缩配置的压力记录显示，肌肉收缩期间模拟器相对两侧的压力得以维持。
纵向压缩既不抑制单通道肌电图控制，也不改善疲劳表现。由于肌肉收缩期间压力得以维持，纵向压缩接受腔有潜力提高多通道肌电图控制的可靠性。
