Evaluation of preventive effect on buttocks immersion of independently controlled inner air cell pressure in air mattress

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  • Yamamoto Yuko
    Department of Gerontological Nursing/Wound Care Management, Graduate School of Medicine, The University of Tokyo
  • Nakagami Gojiro
    Department of Gerontological Nursing/Wound Care Management, Graduate School of Medicine, The University of Tokyo
  • Mori Taketoshi
    Department of Life Support Technology（Molten）Graduate School of Medicine, The University of Tokyo
  • Sakai Kozue
    Department of Gerontological Nursing/Wound Care Management, Graduate School of Medicine, The University of Tokyo
  • Sanada Hiromi
    Department of Gerontological Nursing/Wound Care Management, Graduate School of Medicine, The University of Tokyo

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Other Title
  • エアマットレスにおけるエアセル内圧独立制御による殿部沈み込み防止効果の評価

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Abstract

<p>　An effective method of preventing pressure ulcers is to use mattresses. Air mattresses have high potential to redistribute pressure but are supposed to be less comfortable, since they cause deep immersion of the buttocks, leading to excessive spinal curvature and a bad sleeping posture. In this study, we developed an air mattress with a function called the Fitting Mode, which is expected to prevent deep immersion of the buttocks. Each air cell of this air mattress is controlled independently, so the inner air cell pressure can be set separately. We evaluated this mattress by measuring the degree of immersion and interface pressure in the supine position in 23 subjects（11 males and 12 females; 30.1±7.4 years）. While subjects were lying on the mattress, data were collected in either Fitting Mode（+） or Fitting Mode（-）, under four phases of inner air cell pressure: default（4 kPa）, -0.8 kPa, -1.6 kPa, and -2.4 kPa. At every setting of inner air cell pressure, the buttocks were immersed deeper in Fitting Mode（-） than Fitting Mode（+）. By setting inner pressures of -0.8 kPa, -1.6 kPa and -2.4 kPa, the interface pressure of the buttocks area was higher in Fitting Mode（+） than Fitting Mode（-）, but each interface pressure was under the risk value of pressure ulcer development. Fitting Mode can prevent deeper immersion of the buttocks while maintaining the ability to redistribute pressure.</p>

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