Schematics Digital Blood Pressure Meter


Posted on Feb 5, 2014

This Digital Circuit describes a Digital Blood Pressure Meter concept which uses an integrated pressure sensor, analog signal-conditioning circuitry, microcontroller hardware/software and a liquid crystal display. The sensing system reads the cuff pressure (CP) and extracts the pulses for analysis and determination of systolic and diastolic pressu


Schematics Digital Blood Pressure Meter
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re. This design uses a 50 kPa integrated pressure sensors (Freescale Semiconductor, Inc. P/N: MPXV5050GP) yielding a pressure range of 0 mm Hg to 300 mm Hg. This method is employed by the majority of automated non-invasive devices. A limb and its vasculature are compressed by an encircling, inflatable compression cuff. The blood pressure reading for systolic and diastolic blood pressure values are read at the parameter identification point. The simplified measurement principle of the oscillometric method is a measurement of the amplitude of pressure change in the cuff as the cuff is inflated from above the systolic pressure. The amplitude suddenly grows larger as the pulse breaks through the occlusion. This is very close to systolic pressure. As the cuff ressure is further reduced, the pulsation increase in amplitude, reaches a maximum and then diminishes rapidly. The index of diastolic pressure is taken where this rapid transition begins. Therefore, the systolic blood pressure (SBP) and diastolic blood pressure (DBP) are obtained by identifying the region where there is a rapid increase then decrease in the amplitude of the pulses respectively. Mean arterial pressure (MAP) is located at the point of maximum oscillation. The cuff pressure is sensed by Freescale`s integrated pressure X-ducer °. The output of the sensors is split into two paths for two different purposes. One is used as the cuff pressure while the other is...




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