dilator 1, vaginal cavity 200 and adjacent to each other through the living tissue 300 and vaginal insertion member 2 of longitudinal shape to be inserted into the vaginal cavity 200 of the urethral lumen 100, a urethral insertion member 3 of longitudinal shape that is inserted into the urethra lumen 100, a vaginal insertion member 2 and the urethra insertion member 3 and the coupling means 4 to approach or away from linked to each other, are provided on the vaginal insertion member 2, the vaginal side regulating means 5 for regulating the positional relationship vaginal insertion member 2 of the living tissue 300 which is inserted into the vaginal cavity 200 and a bets, insert vaginal insertion member 2 into the vaginal cavity 200, the urethral insertion member 3 is inserted into the urethral lumen 100, in a state of restricting the positional relationship between the operation of the vaginal side regulating unit 5, the vaginal insert By separating the two for the urethral insertion member 3, and it is configured to extend the biological tissue 300 in a separating direction.拡張器具1は、生体組織300を介して互いに隣接する膣腔200および尿道腔100のうちの膣腔200内に挿入される長手形状の膣挿入部材2と、尿道腔100内に挿入される長手形状の尿道挿入部材3と、膣挿入部材2と尿道挿入部材3とを互いに接近・離間可能に連結する連結手段4と、膣挿入部材2に設けられており、膣腔200に挿入された膣挿入部材2の生体組織300に対する位置関係を規制する膣側規制手段5とを備え、膣挿入部材2を膣腔200内に挿入し、尿道挿入部材3を尿道腔100内に挿入し、膣側規制手段5の作動により前記位置関係を規制した状態で、膣挿入部材2を尿道挿入部材3に対して離間させることにより、その離間方向に生体組織300を広げるよう構成されている。
