Importance

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Abstract

The invention relates to a sphygmomanometer capable of highly accurately judging the maximum blood pressure and minimum blood pressure, which has a cuff 10 which is attached to an appointed portion of a patient and presses the artery by supplying air therein; an optical range sensor 12 which is located opposite said cuff 10 and is able to detect the pulsation displacement of said artery; a digital processing section 14 which is able to judge the maximum and minimum blood pressure of said patient on the basis of photoelectric volumetric pulse wave signals sent out by said optical range sensor 12; and a display section 38 which is able to display the maximum and minimum blood pressure values judged by said digital data processing section 14. When increasing the pressure of the cuff 10 at a constant speed, said digital data processing section 14 is able to judge as the maximum blood pressure the point of disappearance of a photoelectric volumetric pulse wave signal and to judge as the minimum blood pressure the point of appearance of a flat section on the photoelectric volumetric pulse wave signal or its vicinity.

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First Claim