Personalized Wearable Non-invasive Oxygen Saturation And Blood Pressure Monitoring System

In recent years, with the development of microelectronic technology and mobile terminal, wearable electronic equipment caused more and more attention. More and more products have proven that the market can accept the concept of wearable equipment, such as Fitbit pedometer, Jawbone UP, Nike Fuelband and Neusoft health watch. With the deterioration of the environment, the threats of food safety and the trending younger of chronic diseases, more people pay more attention to their own health care. But existing medical monitoring equipments have so many limitations such as large size, power consumption and the complexity of operation. These equipments mostly ignore the individual differences between people in some physiological parameters blood pressure that make their accuracy descend. All of these let traditional medical monitoring equipments cannot integrate into people’s daily life. So a new personalized wearable noninvasive oxygen saturation and blood pressure monitoring system can meet these requirements.Blood pressure and oxygen saturation are important parameters that reflect the human’s physiology and have the extremely important reference value in health monitoring, so this thesis focuses on the two parameters and designs and implements a personalized wearable non-invasive oxygen saturation and blood pressure monitoring system. Without shortcomings of traditional methods, personalized non-invasive continuous blood pressure measurement technology has a considerable advantage in daily situations and. effectively reflect the trend of real-time blood pressure.The system is consisted of three parts:two pieces of independent node modules for acquiring ECG and PPG signals and an Android smart-phone with our application. The acquired ECG and PPG data, which are measured simultaneously by two senser nodes, are sent to user’s Android smart-phone by Bluetooth transmission module in real time and are displaied on screen for monitoring. Heart rate, pulse rate, blood pressure and oxygen saturation can be computed from the ECG and PPG. Because of the characteristics of personalization and wearability, this thesis deeply researches on the feasibility of the wearable ring oxygen probe and the personalized blood pressure estimation model base on pulse transit time. A simple ring type oxygen probe has been made and verified the accuracy and practicability through the comparison experiment with itself and traditional oxygen probes. In the aspect of the personalized blood pressure estimation modeling, seven objects have been made blood pressure estimation model. This thesis has employed three blood pressure estimation models to analyze and compare, i.e. linear model, first-order hyperbolic model and two order hyperbolic model. The errors of the three kinds of model are all less than the AAMI standard 5±8 mmHg, and the error of model 3 on SBP and DBP are 2.86242±2.7283 mmHg and 3.8331±2.995 mmHg respectively.