PROBLEM TO BE SOLVED: To provide a medical wire having a member to be placed inside the living body, capable of surely detaching the member to be placed inside the living body in a short time as a whole.SOLUTION: The medical wire comprises a wire main body and the member to be placed inside the living body connected to the distal end of the wire main body through a connection part, and by the supply of a current for disconnection, the connection part is disconnected and the member to be placed inside the living body is detached. The ratio of the length L of the outer periphery of a cross section vertical to the wire longitudinal direction of the connection part and the length l of the outer periphery of a circle having an area equal to the cross sectional area of the connection part is in a range satisfying (1 expression) L/l&ge1.2.COPYRIGHT: (C)2008,JPO&INPIT【課題】全体として短時間のうちに生体内留置部材を確実に離脱させることのできる、生体内留置部材を有する医療用ワイヤーを提供する。【解決手段】ワイヤー本体と、このワイヤー本体の先端部に接続部を介して接続された生体内留置部材とからなり、切断用電流が供給されることにより前記接続部が切断され、前記生体内留置部材が離脱される医療用ワイヤーであって、前記接続部のワイヤー長手方向に対して垂直な断面の外周の長さLと、前記接続部の断面積と等しい面積を有する円の外周の長さlの比が、(1式)L/l≧1.2を満たす範囲であることを特徴とする。【選択図】なし
