PROBLEM TO BE SOLVED: To install an electrode in an accurately positioned state in a parasympathetic nerve system which runs in a bile duct minimally invasively.SOLUTION: A nerve stimulator 1 includes: an almost cylindrical stent 2 which is insertable in a body cavity while contracting in a radial direction and can press the body cavity inner wall outward in the radial direction while expanding in the radial direction two electrodes 3a, 3b installed on an outer peripheral surface of the stent 2 at an interval in a longitudinal direction a stimulation circuit 4 which is provided in the stent 2 and outputs a stimulus signal to between the electrodes 3a and 3b and a body cavity internal radius detection part 5 which is provided in the stent 2 and detects a change in inner diameter size of the body cavity corresponding to an output of the stimulus signal from the stimulation circuit 4.COPYRIGHT: (C)2013,JPO&INPIT【課題】低侵襲で胆管に走行する副交感神経に精度よく電極を位置決め状態に設置する。【解決手段】半径方向に収縮した状態で体腔内に挿入でき、半径方向に拡張した状態で体腔内壁を半径方向外方に押圧可能な略円筒状のステント2と、該ステント2の外周面に長手方向に間隔を空けて取り付けられた2つの電極3a,3bと、ステント2に設けられ、電極3a,3b間に刺激信号を出力する刺激回路4と、ステント2に設けられ、刺激回路4からの刺激信号の出力に応じた体腔の内径寸法の変化を検出する体腔内径検出部5とを備える神経刺激装置1を提供する。【選択図】図1
