< Topic >It is possible, precision to presume the contraction phase blood pressure well from blood style sounds of the dialysis patient, at the same time, it is possible to presume the contraction phase blood pressure continually by extracting blood style sounds continually the non invasive blood pressure presumption device is offered.SolutionsInputting the highest value of the blood style sound powers where starting point and terminus of first transition of the pulsating wave it drew up the standard pulsating wave curved line which it makes the respective extended period blood pressure and the contraction phase blood pressure correspond, arranging blood style sound power curved lines and the time base which obtain the said standard pulsating wave curved line from blood style sounds of the shunt section, making contrast, it drew up the corresponding curved line of blood style sound powers and the presumption blood pressure, led contraction phase blood pressure presumption linear function from the said corresponding curved line, measured in the said linear function, the blood pressure presumption device which presumes the contraction phase blood pressure.【課題】透析患者の血流音から収縮期血圧を精度良く推定することができ、且つ、血流音を連続的に採取することによって収縮期血圧を連続的に推定することができる、非侵襲的な血圧推定装置を提供する。【解決手段】脈波の立ち上がり区間の起点と終点をそれぞれ拡張期血圧と収縮期血圧に対応させた標準脈波曲線を作成し、該標準脈波曲線をシャント部の血流音から得た血流音パワー曲線と時間軸を揃えて対比させて、血流音パワーと推定血圧との対応曲線を作成し、該対応曲線から収縮期血圧推定1次関数を導き、該1次関数に測定した血流音パワーの最高値を入力して収縮期血圧を推定する血圧推定装置。
