Brienza D M, Karg P E, Brubaker C E
University of Pittsburgh, Department of Rehabilitation Science and Technology, PA 15260, USA.
IEEE Trans Rehabil Eng. 1996 Dec;4(4):320-7. doi: 10.1109/86.547933.
A method for designing seat support surfaces using interface pressure and soft tissue stiffness criteria was evaluated. An algorithm designed to drive a rigid support surface on a programmable seating system to a shape for which the externally applied pressure is inversely related to the measured stiffness of adjacent soft tissue was evaluated on 30 elderly subjects (age 65 years or older). The resulting support surface shapes were transferred to compliant foam cushions and evaluated using interface pressure measurements. Pressure and stiffness measurements on the seating system indicated the surface shape control algorithm met the desired programmed criteria by achieving an inverse relationship between pressure and stiffness, as it converged to an "optimal" support surface shape. Evaluation of interface pressures on the compliant foam cushions showed that the pressure distributions on the cushions contoured to the optimal surface shapes were more uniform and had lower values than distributions on flat foam cushions and foam cushions contoured to shapes measured using state-of-the-art load-deflection devices. The results suggest that support surfaces designed using tissue stiffness as a criteria can provide loading conditions intended to minimize relative deformation and, thus, stress in load-bearing soft tissue.
对一种使用界面压力和软组织刚度标准来设计座椅支撑表面的方法进行了评估。在30名65岁及以上的老年受试者身上，对一种算法进行了评估，该算法旨在将可编程座椅系统上的刚性支撑表面驱动到这样一种形状，即外部施加的压力与相邻软组织的测量刚度成反比。所得的支撑表面形状被转移到顺应性泡沫坐垫上，并通过界面压力测量进行评估。座椅系统上的压力和刚度测量表明，表面形状控制算法通过实现压力与刚度之间的反比关系，达到了预期的编程标准，因为它收敛到一个“最佳”支撑表面形状。对顺应性泡沫坐垫上的界面压力进行评估表明，轮廓符合最佳表面形状的坐垫上的压力分布比平坦泡沫坐垫和轮廓符合使用最先进的载荷-挠度装置测量的形状的泡沫坐垫上的压力分布更均匀，且值更低。结果表明，以组织刚度为标准设计的支撑表面可以提供旨在最小化相对变形从而使承重软组织中的应力最小化的加载条件。
