The present invention provides a medical device that can be placed in certain brain regions, the bag member filled in therapeutics. In using the medical device of the present invention, first, in a state of inserting the sheath 1 in the brain regions, operation of filling the therapeutic agent in the bag member 3 through the inlet tube 2, and the bag member 3 There after out of order operations to relatively retracted relative to the filling tube 2 and the sheath 1 until it projects forwardly from the distal end of the sheath 1, the bag can be moved relative to the injection tube 2 and the operating member 5 by removing from the tip of the injection tube 2 and member 3, it is placed in the brain regions in the bag member 3.本発明は、治療用物質の充填された袋部材を、所定の脳領域に留置できる医療用装置を提供する。本発明の医療用装置を使用する際には、まず、脳領域内にシース1を挿入した状態で、注入管2を通して袋部材3の中に治療用物質を充填する操作、および、袋部材3がシース1の先端より前方へ突出するまでシース1を注入管2に対して相対的に後退させる操作を順不同で行った後、操作部材5を注入管2に対して相対的に移動させて袋部材3を注入管2の先端から取り外すことにより、袋部材3を脳領域内に留置させる。
