PROBLEM TO BE SOLVED: To provide a medical instrument capable of changing a material in a fluid state capable of being administered into a biological tissue using a tube body into a medical material having relatively low fluidity and indwelling the medical material in an optional region inside the biological tissue in a more desired shape/state, and capable of reducing undesirable influence on a living body.SOLUTION: A medical instrument 10 for changing a material having fluidity into a medical material M to indwell the medical material M by administering the material having fluidity into a biological tissue and reducing the fluidity of the material inside the biological tissue, has: a sheath 20 in which a storage lumen 23 is formed a gap formation part 30 having two expansion parts 31 which can be projected in a distal direction from the inside of the storage lumen 23 and can be expanded in the radial direction of the sheath 20 an operation part 40 which can be moved inside the storage lumen 23, and can expand the expansion parts 31 by moving with respect to the expansion parts 31 and a supply part 50 in which a delivery lumen 51 capable of delivering the material is formed, and which can supply the material into a gap between the expansion parts 31 of an expanded state.COPYRIGHT: (C)2015,JPO&INPIT【課題】管体を用いて生体組織内へ投与可能な流動性状態の材料を、生体組織内の任意の部位に、より望ましい形状・状態で流動性が相対的に低い医療用材料へ変化させて留置可能であり、かつ生体への望ましくない影響を低減できる医療用器具を提供する。【解決手段】流動性を有する材料を生体組織内へ投与し、前記材料の流動性を生体組織内で低下させることで医療用材料Mへ変化させて留置するための医療用器具10であって、収容ルーメン23が形成されるシース20と、収容ルーメン23内から先端方向へ突出可能であり、シース20の径方向へ拡開可能な2つの拡開部31を有する間隙形成部30と、収容ルーメン23内を移動可能であり、拡開部31に対して移動することで拡開部31を拡開させる作動部40と、前記材料を送達可能な送達ルーメン51が形成され、拡開された状態の拡開部31の間の間隙に前記材料を供給可能な供給部50と、を有する。【選択図】図2
