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Design and Evaluation of a Low-floor Care-bed for Elderly People

고령자용 저상 요양침대의 설계 및 평가

  • 배주환 (근로복지공단 재활공학연구소) ;
  • 문인혁 (동의대학교로봇자동화전공)
  • Received : 2016.12.16
  • Accepted : 2016.12.23
  • Published : 2017.02.28

Abstract

It was hard for a conventional care-bed to be realized to a low-floor position due to a complex actuation mechanism installed under the mattress support platform. In this paper a mechanism design to set a low-floor position as well as to adjust back- and leg-rest angles was proposed. A dual motor was applied to the back- and leg-rest mechanism of which design parameters were determined by an optimal method. An elevation mechanism was also designed to enlarge a limited stroke range up to two times of its original stroke using a pulley mechanism. An evaluation test was performed by five healthy subjects ($24.4{\pm}0.5yrs.$) when going up from a floor position to a preset best position which was set to the 240mm height for a prototype low-floor bed and to the 600mm height for a conventional bed. As a result, the moving distance was 38% lower than the conventional bed when the subject used the low-floor bed. It showed that the low-floor care-bed reduced physical burdens and was effective to assist activities of daily living of the elderly people.

기존의 가정용 요양침대는 매트리스 지지판(mattress support platform) 하부에 설치된 복잡한 기구부로 인해 저상화 실현이 어려웠다. 본 논문에서는 등판과 다리판의 각도를 조절하면서도 저상화가 가능한 요양침대의 구동 메커니즘을 제안한다. 등판과 다리판의 메커니즘은 듀얼 모터(dual motor)를 적용하고, 최적화 기법으로 설계변수를 결정하였다. 승강 메커니즘은 풀리(pulley)구조를 적용하여 제한된 구동기의 가동범위를 최대 두 배까지 높일 수 있도록 설계하였다. 건강한 5명의 피험자($24.4{\pm}0.5$세)가 방바닥에서 240mm의 저상 프로토타입 요양침대와, 600mm의 일반적인 높이의 침대에 올라갈 때의 그 이동 거리를 측정하여 저상화 침대에 대한 유효성을 평가하였다. 그 결과 저상 요양침대를 사용할 때의 이동 거리는 기존 높이의 침대에 비해 평균 38% 작았다. 이것은 저상요양침대가 고령자의 신체적 부담을 줄여주며, 일반침대보다 일상생활 지원에 효과적이라는 것을 보여주었다.

Keywords

References

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