PROBLEM TO BE SOLVED: To provide a bathtub system which includes a function to detect blood pressure variation of a user during bathing and prevents an accident during bathing before.SOLUTION: The pulse wave is detected by a blood flow detecting part 6 installed in the tip of a finger 22 of a user 2 while the vibration of the body surface that corresponds to the electrocardiogram of the user 2 is detected by a piezoelectric element 51 of a vibration detection part 5 built into a pillow part 54 arranged in a marginal part 11 of the bathtub body 1. The pulse wave propagation time that varies according to the blood pressure is acquired, from the difference of time from the detection timing of the vibration peak by the vibration detection part 5 to the detection timing of the pulse wave peak by the blood flow detecting part 6, in a pulse wave propagation time analysis section 7. The trigger is given to driving device 42 of a draining means 4 when the blood pressure decline of 10 to 20% or more for instance is detected from the pulse wave propagation time by the blood pressure variation detecting part 3, a drainage plug 41 is driven to open a drain outlet 13. As a result, hot water 14 in the bathtub body 1 is drained away.COPYRIGHT: (C)2012,JPO&INPIT【課題】入浴中の事故を未然に防止する。【解決手段】浴槽本体1の縁部11に配置した枕部54に内蔵された振動検出部5の圧電素子51によって、ユーザ2の心電図に相当する体表面の振動が検出される一方、ユーザ2の指先22に装着した血流検出部6によって脈波が検出される。振動検出部5による振動ピークの検出タイミングから、血流検出部6による脈波ピークの検出タイミングまでの時間差から、脈波伝搬時間解析部7において、血圧に応じて変化する脈波伝搬時間が求められる。血圧変動検知部3は、前記脈波伝搬時間から、例えば10~20%以上の血圧低下を検知すると、排水手段4の駆動装置42にトリガを与え、排水栓41を駆動して、排水口13を開放する。これにより、浴槽本体1内の湯14は排出される。【選択図】図1
