Medical devices of the present invention (100) is formed from wire (305,400,500,600,700), the coil with the axis in the radial direction perpendicular to (y) whereas the longitudinal axis (x) and I equipped with a (110). Cross-section having a moment of inertia with respect to an axis parallel to the axis of the radial direction of the coil through the moment of inertia, the center of gravity for an axis parallel to the longitudinal axis of the coil passes through the center of gravity, the center of gravity wire (401,501,601) I have a. Moment of inertia with respect to an axis parallel is greater than the moment of inertia with respect to an axis parallel to the axis of the radial direction of the coil passes through the center of gravity to the longitudinal axis of the coil passes through the center of gravity.本発明の医療器具(100)は、ワイヤ(305,400,500,600,700)から形成され、長手方向の軸線(x)及びそれに対して直角をなす径方向の軸線(y)を有するコイル(110)を備える。ワイヤは、重心、重心を通過しコイルの長手方向の軸線に平行な軸線に対する慣性モーメント、重心を通過しコイルの径方向の軸線に平行な軸線に対する慣性モーメントを備える断面(401,501,601)を有する。重心を通過しコイルの長手方向の軸線に平行な軸線に対する慣性モーメントは、重心を通過しコイルの径方向の軸線に平行な軸線に対する慣性モーメントよりも大きい。
