﻿ 基于脉搏波的无创血压检测系统
 光学仪器  2019, Vol. 41 Issue (5): 10-16 PDF

Non-invasive blood pressure detection system based on pulse wave
ZHANG Lei, SHAN Xinzhi, GAO Xiumin
School of Optical-Electrical and Computer Engineering，University of Shanghai for Science and Technology，Shanghai 200093，China
Abstract: Aiming at the problem that the non-invasive blood pressure measuring instrument is large and inconvenient to carry and needs professional operation, this paper proposes a non-invasive blood pressure measuring system. Based on the principle of pulse wave conduction and the interaction between light and matter, the system extracts and analyses the photoelectric signal modulus of the skin at the wrist. The arterial blood flow velocity is then calculated, that is, the pulse wave conduction velocity. Finally, the hemorrhagic pressure is calculated. We have tested the performance of the system. The experimental results show that the average relative error between the system and traditional blood pressure measuring instruments is less than 5%. The system is helpful to realize real-time blood pressure monitoring. It has the characteristics of small size, low cost, simple measurement method, easy to carry and large data management. It can be used for human health management.
Key words: noninvasive    blood pressure detection    photoelectric signal

1 血压检测原理

 图 1 血管模型 Figure 1 Vascular model

 $C = \sqrt {\frac{{Eh}}{{\rho D}}}$ (1)

 $E = {E_0} \cdot {{\rm{e}}^{\gamma P}}$ (2)

1878年，Moens对Thomas Young提出的公式进行了修正，公式[12]如下：

 $C=K\sqrt{\frac{Eh}{\rho D}}$ (3)

 $C = \frac{S}{T}$ (4)

 $P = \frac{1}{\gamma }\left[ {\ln \left( {\frac{{\rho D{S^2}}}{{h {E_0}K}}} \right) - 2\ln T} \right]$ (5)

 $\frac{{{\rm{d}}P}}{{{\rm{d}}T}} = - \frac{2}{{\gamma T}}$ (6)

 ${\rm{\Delta }}P = - \frac{2}{{\gamma T}}{\rm{\Delta }}T$ (7)

2 系统硬件设计 2.1 系统硬件组成

 图 2 系统硬件结构示意图 Figure 2 Systematic hardware
2.2 心率算法电路

2.3 血压算法电路及校准电路

 图 3 血压算法电路及校准电路 Figure 3 Blood pressure arithmetic circuit and calibration circuit
2.4 电源电路

2.5 MCU及外围电路

3 系统软件设计 3.1 主控程序

 图 4 系统软件流程图 Figure 4 The flow chart of the system’s software
3.2 光源驱动程序

3.3 数据采集程序

3.4 系统校准程序

 图 5 数据采集程序流程图 Figure 5 The flow chart of data acquisition program
4 测试与分析

 图 6 血压测试数据对比折线图 Figure 6 Comparison of blood pressure test data
5 结论与分析

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