Patent ID: 6358212
Filing Date: 2002-03-19
Classification: A61B

Abstract:
A noninvasive continuous blood pressure measuring apparatus comprising:oscillating means for generating an oscillation signal having a desired frequency and a desired amplitude; a substrate; a plurality of exciters arranged on said substrate in a direction responsive to said oscillation signal for inducing exciter waveforms in an artery and blood in said artery of a living body; a plurality of sensors respectively arranged on said substrate in said direction of predetermined distance apart from said exciters for receiving induced exciter waveforms transmitted through said artery from said living body and outputting detection signals; switching means for effecting recurrently switching and time-divisionally outputting outputs of said sensors; determining and selecting means responsive to said switching means for determining one of said sensor outputs in accordance with an output of said switching means and a predetermined judging condition and for selecting and outputting said one of said sensor outputs; calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body; calculating means for receiving said absolute values from said hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said one of said outputs from said determining and selecting means and said absolute values; displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means; wherein said substrate correspondingly arranges said exciters and said sensors such that pairs, each of which includes an exciter and a sensor, are arranged in said direction and said exciter and said sensor of each pair are arranged in a second direction perpendicular to said direction; and attaching means for attaching said substrate to said living body.