PROBLEM TO BE SOLVED: To provide an electronic sphygmomanometer capable of using a pulse wave gate even if a measurer is a person with weak pulses, setting a gate section from signals of K-sound detecting air bags for measuring the K-sound, and suppressing the cost by eliminating the need for dedicated measuring environment for using the pulse wave gate.SOLUTION: An arm band includes: an ischemic air bag that can pressurize an upper arm by feeding air thereto a plurality of K-sound detecting air bags that are disposed inside the ischemic air bag and have the air volume smaller than the air volume of the ischemic air bag and a K-sound sensor that acquires a signal by detecting fluctuations in the air inside the K-sound detecting air bags, generated when the blood flow flows again by depressurization after the ischemic air bag has pressurized the upper arm T to stop the blood flow. This electronic sphygmomanometer separates the signal DS1 from the K-sound sensor into a low frequency component signal DS2 and a high frequency component signal DS3, opens the gate section GT with a peak point PP of the low frequency component signal DS2 defined as the center, and extracts the high frequency component signal DS3 inside the gate section GT.COPYRIGHT: (C)2012,JPO&INPIT【課題】測定者が脈弱者であっても脈波ゲートを使用することができ、K音計測用のK音検出用空気袋の信号からゲート区間の設定が可能で、脈波ゲートを利用するための専用の計測環境を必要とせず、コスト抑制できる電子血圧計を提供する。【解決手段】腕帯部は、空気を供給することで上腕を加圧可能な阻血用空気袋と、阻血用空気袋の内側に配置され阻血用空気袋の空気容量よりも小さい空気容量を有する複数のK音検出用空気袋を有し、阻血用空気袋が上腕Tを加圧して血流を止めた後に減圧し、再び血流が流れる時に生じるK音検出用空気袋内の空気の変動を検知して信号を得るK音センサと、K音センサからの信号DS1を、低周波成分信号DS2と、高周波成分信号DS3に分離して、低周波成分信号DS2のピークポイントPPを中心にゲート区間GTを開き、ゲート区間GT内の高周波成分信号DS3を抽出する。【選択図】図16
