A Study Of Wearable System For Continuous Blood Pressure Monitoring

Blood pressure is an important physiological parameter. However, the bloodpressure is generated by the cardiovascular system, which are subject to variousfactors, under the regulation of the nervous system, when the body’s cardiacsympathetic arousal, norepinephrine will be released by the nerve endings, whichcan act on the receptorsβ, the impact is heart rate, myocardial contractility,increased cardiac output, leading to vasoconstriction and increasing bloodpressure; when parasympathetic nervous excitement, acetylcholine will bereleased from the nerve endings, it will act on the receptors m, the effect contraryto the above. Vascular resistance is also a major factor affecting blood pressure,so the result of measurement of blood pressure in different ways could be verydifferent.For this situation, this study proposes a compensation method for pulsetransmission time based on blood pressure measurement method. Since the pulsetransmission time variation and pulse transmission time variability can reflect thechange in vascular resistance, heart rate and heart rate variability can be a di rectreflection of neural activity on blood pressure, study proposes these variables asa compensation on the model about blood pressure and pulse transmission time,this method solves the error in diastolic blood pressure monitoring. And design awearable continuous non-invasive blood pressure monitoring system, to achievethe measurement of blood pressure, and it is not bound by time and place, smallsize, low cost, and high stability.This thesis mainly includes the following sections, the research of cu fflesscontinuous blood pressure monitoring algorithm and related experimentaldesign，the design of wearable continuous blood pressure monitoring system. Inthe monitoring algorithm section, put forward the idea of increasingcompensation term to the model, and designed a novel blood pressure calibrationalgorithm to solve the problem about large error in diastolic blood pressuremonitoring. In the monitoring system section, achieved the signal transmissionand reception of the mobile terminal.