Load dependence must be kept in mind when evaluating mattress pressure redistribution, to prevent the development of pressure ulcers at bony prominences. However, there is no standardized method for analyzing load-dependent behavior after mattress pressure redistribution. In this study, a portable palmtop device with a simple load-sensing mechanism was developed for measuring the mean pressure exerted by a protruding shaft surrounded by a disc on low-resilience polyurethane (LRPu) foam, latex foam, coconut fiber and latex (CFL) mattresses, as well as polyurethane (Pu) foam bed and an LRPu foam mattress laid on a bed. Finite element (FE) analysis was used to analyze deformation and contact pressure in detail. The pressure redistribution was greatest for the LRPu foam mattress, and excessive compression was avoided by using an underlay made of stiff Pu foam. FE analysis revealed that the contact pressure increased significantly near the outer circumference of the protruding shaft and the surrounding disc. Significant nonuniformity in pressure was evident, according to the edge and bottom geometry of the device. The measurements and FE analysis revealed load-dependent pressure redistribution behavior, which should allow mattresses to be tailored on an individual basis.

中文翻译：

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不同类型床垫负载相关压力再分布行为的测量和有限元分析

在评估床垫压力重新分布时，必须牢记负荷依赖性，以防止在骨突出处发生压疮。然而，没有标准化的方法来分析床垫压力重新分配后的负载相关行为。在这项研究中，开发了一种具有简单负载传感机制的便携式掌上设备，用于测量由低回弹聚氨酯 (LRPu) 泡沫、乳胶泡沫、椰子纤维和乳胶 (CFL) 上的圆盘包围的突出轴施加的平均压力) 床垫，以及铺在床上的聚氨酯 (Pu) 泡沫床和 LRPu 泡沫床垫。有限元（FE）分析用于详细分析变形和接触压力。LRPu 泡沫床垫的压力再分配最大，并且通过使用由硬质 Pu 泡沫制成的衬垫来避免过度压缩。有限元分析表明，在突出轴和周围盘的外圆周附近，接触压力显着增加。根据装置的边缘和底部几何形状，压力明显不均匀。测量和有限元分析揭示了与负载相关的压力重新分布行为，这应该允许床垫根据个人情况进行定制。