PROBLEM TO BE SOLVED: To provide a fluid expansion type multistage cushion for a dental treatment chair, which enables a patient short in height to reliably place his/her head in a headrest and to split gargle water and the like into a spittoon without a trouble.SOLUTION: A fluid expansion type multistage cushion 1 for a dental treatment chair, which is placed on a chair seat face of a chair body, comprises: a fluid cushion body 2 including a surface material 11, a rear face material 12, and an expandable side face material 13 connecting peripheral inner sides of the surface material and rear face material by using an inside partition member so as to partition the inside in two or more layers and forming fluid bags, being of a folding type so as to individually change thicknesses of the fluid bags in the respective layers, and having a bellows form having two or more stages and fluid supply means 21 injecting and exhausting fluid individually with respect to the respective fluid bags. A seat face area for a patient M formed by the surface material is uniform and only thicknesses of the respective layers of a fluid cushion body are individually expanded/contracted due to individual expansion/contraction of the expandable side face material according to individual fluid injection amounts by the fluid supply means with respect to the respective fluid bags.COPYRIGHT: (C)2016,JPO&INPIT【課題】背の低い患者に対して、頭部をヘッドレストに確実に収め、うがい水等を支障なくスピットンに吐くことを可能とする歯科診療椅子用流体膨縮式多段クッションを提供する。【解決手段】椅子本体の椅子座面に載置される歯科診療椅子用流体膨縮式多段クッション1であって、表面材11と、裏面材12と、表面材、裏面材の周辺部内側同士を中仕切り材を用いて内部を2層以上に区画するように連結して流体袋を形成し、各層の流体袋の厚さを個別に変化し得るように折り畳み式とした2段以上の蛇腹形態の伸縮式側面材13とを具備する流体クッション本体2と、各流体袋に対する流体注入・流体排気を個別に行う流体供給御手段21とを有し、表面材が形成する患者M用の座面面積を一定としつつ各流体袋に対する流体供給御手段による個別の流体の注入量に応じた伸縮式側面材の個別の伸縮により流体クッション本体の各層の厚さのみを個別に膨縮させる構成とした。【選択図】図1
