基于容积振动法的如厕时血压检测系统研究

Study on blood pressure detection system in toilet based on the volume-oscillometric method

目的开发基于容积振动法的股动脉部位无创血压检测系统,以实现人们在日常如厕时就可完成血压的日常监测,改善了普通家庭血压检测的检测不规律、有拘束、因被检测者紧张导致的检测数据不准确等的不足。方法系统的检测部位为大腿股动脉,检测方式采用机械式提升、充气气囊局部加压,压力传感器测压的检测模式。为提高光电传感器的检测精度,本研究探究了传感头尺寸、传感头发光二极管与光电二极管布置以及气囊安装的最佳参数。最后对7名健康的大学师生进行了检测试验并以上臂式电子血压计作为对比实验仪器,对系统的性能和精度进行了实验评价。结果本系统与上臂式电子血压计测得的收缩压的相关系数为r=0.94,舒张压的相关系数为r=0.93,两者具有良好的直线相关性;并且,收缩压和舒张压均有95%以上的实验结果分布在95%置信区间的范围之内,说明两种测量方法具有良好的一致性。结论以容积振动法为检测方法以大腿股动脉为检测对象,实施如厕时无创性血压检测是可行的。

Objective A noninvasive blood pressure detection system based on the volume-oscillometric method is developed,and daily monitoring of blood pressure can be realized while people on the toilet.The system improves the deficiencies of blood pressure detection in ordinary families,such as irregular,restrained,and inaccuracy caused by the tension.Methods The femoral artery is used as the detection object,and the detection mode of mechanical lifting,local pressurization by air bag and pressure measurement by pressure sensor is adopted in the system.In order to improve the detection accuracy of photoelectric sensors,we discuss the optimal parameters of sensor head size,arrangement of light emitting diodes and photodiodes,and airbag installation.Finally,the performance and accuracy of the system are evaluated by using seven healthy university teachers and students as the subjects and the arm type electronic sphygmomanometer as the comparative experimental instrument.Results The correlation coefficients of systolic blood pressure(SBP)and diastolic blood pressure(DBP)measured by the system and the electronic sphygmomanometer are r=0.94 and r=0.93 respectively,both have good linear correlation;and,more than 95%of the experimental data of the systolic blood pressure and diastolic blood pressure are distributed within the 95%confidence interval,showing good consistency in the two measurement methods.Conclusions It is feasible to use the volume-oscillometric method to detect noninvasive blood pressure of femoral artery while people on the toilet.