PROBLEM TO BE SOLVED: To provide a method capable of sensitively monitoring fluctuation of pressure generated in a body of a creature due to breathing and/or heartbeat of the creature.SOLUTION: A pressure vibration body 1 includes a piezoelectric vibrator 10 and a disc-like contact piece 20 having a swollen part 21 on one surface and the swollen part 21 of which is arranged in contact with the surface of the piezoelectric vibrator 10. The swollen part 21 is formed of organic polymeric elastic material with a physical property indicating fluctuation of a contact area between the swollen part 21 and the piezoelectric vibrator 10 in accordance with pressure fluctuation generated in a body of a creature when a creature contact surface 22 is placed in a state of contact with the body surface of a creature 2. The pressure vibration body 1 is arranged on the body surface of the creature 2 in a state of being contact with the creature contact surface 22 of the contact piece. AC voltage of a current value V is applied to the piezoelectric vibrator 10 to turn the piezoelectric vibrator 10 in a vibration state, and a current value I of the current flowing in the piezoelectric vibrator 10 is measured to calculate fluctuation of impedance (Z=V/I) of the piezoelectric vibrator from the current value I and the current value V.COPYRIGHT: (C)2015,JPO&INPIT【課題】動物の呼吸及び/又は心拍により、その動物の体内で発生する圧力の変動を感度良く監視できる方法を提供する。【解決手段】圧電振動子10、一方の表面に膨出部21を備え、膨出部21が圧電振動子10の表面に接触配置されている盤状の接触子20を含む圧力振動体1、但し膨出部21は、動物接触面22が動物2の体表面に接触状態に置かれた場合に、動物の体内で発生する圧力変動に応じて膨出部21と圧電振動子10との接触面積が変動を示す物性を持つ有機高分子弾性材料から形成されている、を動物2の体表面に、接触子の動物接触面22にて接触した状態で配置し、圧電振動子10に電圧値Vの交流電圧を印加して圧電振動子10を振動状態として、圧電振動子10を流れる電流の電流値Iを測定し、その電流値Iと電圧値Vとから圧電振動子のインピーダンス(Z=V/I)の変動を算出する。【選択図】図2
