M J Nouri, G Aminian, F Farahmand, M Rahgozar
PhD Candidate, Department of Orthotics and Prosthetics, University of Social Welfare and Rehabilitation Science, Tehran, Iran.
PhD, Department of Orthotics and Prosthetics, University of Social Welfare and Rehabilitation Science, Tehran, Iran.
J Biomed Phys Eng. 2020 Aug 1;10(4):543-548. doi: 10.31661/jbpe.v0i0.2001-1056. eCollection 2020 Aug.
Diurnal volume changes is one of the main factors influencing socket fit in transtibial prosthesis and causing pressure problem issues. Embedded bladder liners have been recently a potential approach to deal with this problem. The aim of this technical note was to introduce a new transtibial silicone liner designed based on hybrid socket theory. To make expandability in the liner, an integrated wax structure was constructed over the selected areas of the positive model and then removed after lamination process. In addition, a mechanical system with manual control was designed to fit the liner with the residual limb volume by pumping the water in or out of the liner through connective tubes. The results showed that this new design had high reliability in maintaining identical surface pressures after volume changes in laboratory trials. Therefore, it seems that selective expandability of this liner would accommodate residual limb volume fluctuations without disturbing effect on preliminary pressure pattern.
日间容积变化是影响经胫骨假肢接受腔适配并导致压力问题的主要因素之一。嵌入式膀胱内衬最近成为解决这一问题的一种潜在方法。本技术说明的目的是介绍一种基于混合接受腔理论设计的新型经胫骨硅胶内衬。为使内衬具有可扩展性，在阳模的选定区域构建了一个集成蜡结构，然后在层压过程后将其移除。此外，设计了一个手动控制的机械系统，通过连接管将水抽入或抽出内衬，以使内衬与残肢容积相适配。结果表明，在实验室试验中，这种新设计在容积变化后保持相同表面压力方面具有很高的可靠性。因此，这种内衬的选择性可扩展性似乎能够适应残肢容积波动，而不会对初始压力模式产生干扰。
