PROBLEM TO BE SOLVED: To provide a resonance signal amplification probe capable of adjusting resonance frequency to Larmor frequency, and to provide a high-frequency treatment instrument for endoscopes.SOLUTION: A resonance signal amplification probe that is inserted in a body cavity and amplifies a resonance signal, when capturing an image using a magnetic resonance spectroscopy, includes: a flexible sheath an operation wire that is inserted in the interior of the flexible sheath a loop-shaped resonant circuit that can project/retract with respect to the distal end of the flexible sheath a connecting member for connecting the distal end of the operation wire to the resonant circuit and an operating section that advances/retracts the operation wire in the interior of the flexible sheath to advance/retract the resonant circuit. The resonant circuit has a loop-shaped resonance coil electromagnetically coupled with a receiving coil that receives a resonance signal when capturing an image using a magnetic resonance spectroscopy, and a capacitor inserted inside the loop of the resonance coil and serially connected to the resonance coil. The loop diameter of the resonance coil changes with the advance/retraction of the resonant circuit.COPYRIGHT: (C)2013,JPO&INPIT【課題】共振周波数をラーモア周波数に調整可能な共鳴信号増幅用プローブ及び内視鏡用高周波処置具を提供すること。【解決手段】共鳴信号増幅用プローブは、磁気共鳴分光法を用いた撮影の際に体腔内に挿入されて共鳴信号を増幅する共鳴信号増幅用プローブであって、可撓性シースと、可撓性シースの内部に挿通させた操作ワイヤと、可撓性シースの先端から突没可能なループ状の共振回路と、操作ワイヤの先端部と共振回路とを連結する連結部材と、可撓性シース内で操作ワイヤを進退させることにより共振回路を進退させる操作部とを備え、共振回路は、磁気共鳴分光法を用いた撮影の際に共鳴信号を受信する受信コイルと電磁的にカップリングするループ状の共振コイルと、共振コイルのループ内に挿入され共振コイルに直列に接続されるコンデンサとを備え、共振コイルのループ径は、共振回路の進退に応じて変化する。【選択図】 図3
