Developing a Bed with New Backrest Elevation System in Order to Decrease Shearing Force and Pressure Loading During Backrest Elevation

MORI Masaharu, ENDO Akemi, OSHIMOTO Yumi, MICHISHIGE Yukie, KOYAMA Emiko

doi:10.5100/jje.45.163

It is well known that pressure loading and shearing force occur at backrest elevation (BE) of a Gatch bed. Those phenomena are thought to be caused by differences between movements of the body and the backrest during BE, but this theory has not been examined precisely. The simulation of body movement during BE showed that movement of the backrest should be changed according to body size, thickness of the mattress, and lying position. Therefore, we developed a new BE system in which the backrest was connected to the bed body with a rotating arm that lengthened with rotation of the arm and rotation of the backrest. This new BE system could adapt to differences in body size, thickness of the mattress, and lying position. Performance tests of this new BE system using 5 subjects with different body sizes and with 2 mattresses with different thicknesses showed good results similar to those of the simulation. Then, performance of this new BE system was compared with commercially available hospital beds in 12 aged subjects. This new BE system showed a better ratio of loading weight and peak pressure on the back on a comparison between those before and after BE. Furthermore, movement displacement of the weight loading center of the back by BE and slipping displacement of the head after BE were better than those of a commercially available hospital bed.

Developing a Bed with New Backrest Elevation System in Order to Decrease Shearing Force and Pressure Loading During Backrest Elevation

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