PROBLEM TO BE SOLVED: To provide a piston with a simpler structure, an instrument for collecting a fat cell equipped with the piston, and a method for collecting a fat cell using the instrument.SOLUTION: A piston 100 includes a piston body 102 for defining the inside of a syringe into a front chamber and a rear chamber, a free oil flow channel 104 for communicating the front chamber and the rear chamber, a filter 110 for regulating the passage of a fat cell and permitting the passage of free oil, and a flow channel opening/closing member 106. The free oil flow channel 104 includes a thick width part 118 and a thin width part 120. The flow channel opening/closing member 106 is arranged in the thick width part 118, and includes a projection part 124 to be fitted in the thin width part 120 so as to be freely inserted or removed. The flow channel opening/closing member 106 can be displaced between a first position in which the projection part 124 is fitted in the thin width part 120 and a second position from the thin width part 120 of which the projection part 124 projects, and when the flow channel opening/closing member 106 is in the first position, the movement of the free oil from the front chamber to the rear chamber is regulated.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】より簡易な構造を有するピストンと、このピストンを備える脂肪細胞採取用器具と、この器具を用いた脂肪細胞の採取方法とを提供する。【解決手段】ピストン100は、シリンジ内を前室と後室とに区画するピストン本体102と、前室と後室とを連通するフリーオイル流路104と、脂肪細胞の通過を規制しフリーオイルの通過を許容するフィルタ110と、流路開閉部材106とを備える。フリーオイル流路104は、太幅部118と細幅部120とを含む。流路開閉部材106は、太幅部118内に配置され、また細幅部120に挿抜自在に嵌め込まれる突起部124を有する。流路開閉部材106は、細幅部120に突起部124が嵌め込まれた第1位置と、細幅部120から突起部124が抜き出た第2位置との間で変位可能であり、流路開閉部材106が第1位置にあるとき前室から後室へのフリーオイルの移動が規制される。【選択図】図2
