无创胎儿心率检测仪的研制  

Portable fetal heart rate monitor

作　　者：吴英超[1] 向平[1] 刘瑞花[1] 

机构地区：[1]西北工业大学机电工程学院,西安710072

出　　处：《北京生物医学工程》2008年第5期524-526,530,共4页Beijing Biomedical Engineering

基　　金：西北工业大学纳米小精灵创新大赛资助

摘　　要：介绍一种基于32位ARM嵌入式微处理器LPC2290和MEMS微加速度传感器的一种便携、无创的胎儿心率检测仪。通过加速度传感器将胎儿心跳震动信号转化为电信号,经过两级放大电路和滤波陷波电路后通过A/D转换电路将信号送入ARM单片机。利用自相关算法对信号进行处理,最后计算得到胎儿的心率,结果采用小型液晶进行显示。研究解决了微弱信号的采集和数字信号处理等难题,研制出了一种便携、无创且价格低廉的胎儿心率检测仪,操作简便非常适合家庭使用。This paper introduces a new type of portable and no invasive fetal heart rate monitor which based on 32- bit ARM embedded microprocessor LPC2290 and MEMS acceleration transducer. The signal of fetal heartbeat is transformed to electrical signal by the acceleration transducer, then is sent to ARM through a filter,an amplifying circuit and a A/D switching circuit. The digital signals is about with a kind of adaptive algorithm, and the computed heart rate by a small LCD. This research solved the problems of faint signal acquisition and digital signal proceeding. And a portable,no invasive and cheap heart rate monitor was designed, which is very easy to operate in family.

关 键 词：胎儿心率 滤波器 LPC2290 自相关算法 MEMS 

分 类 号：R318.04[医药卫生—生物医学工程] TP271.5[医药卫生—基础医学]