Abstract: A blood pressure measurement system is able to measure actual blood pressures. More specifically, the blood pressure sensor or sphygmomanometer is able to detect high frequencies that exist only between systole and diastole, and thus identify aspects such as micro-pulses associated with the opening and closing of an artery to achieve accurate blood pressure readings.

Abstract: The present invention relates to an improved non-invasive sphygmomanometer which is able to calculate the quality of a blood pressure reading and display quality information to the user. More specifically the invention relates to a sphygmomanometer and the use of oscillometric readings to calculate the quality of the readings, and a quality indicator device for use with the same. The invention uses the identified relationship between the waveform quality from recorded oscillometric pulses and blood pressure (BP) measurement error.