准确地检测心脏大动脉的开口,朝着非侵入性的连续血压检测迈进
概括
这项研究引入了一个耳塞系统,用于使用脉冲过渡时间 (PTT) 进行持续的,非侵入性的血压 (BP) 监测. 改进的算法提高了BP估计的准确性,为可穿戴心血管健康管理铺平了道路.
科学领域:
- 生物医学工程 生物医学工程
- 心血管技术的心血管技术
- 可穿戴的健康设备
背景情况:
- 持续,非侵入性血压 (BP) 监测对于心血管健康管理至关重要.
- 现有的方法往往缺乏精度或是侵入性的.
- 精确估计动脉脉冲过渡时间 (PTT) 是非侵入性血压监测的关键.
研究的目的:
- 开发和验证一种基于耳塞的新型系统,用于持续的,非侵入性的血压监测.
- 为了提高近距离时间 (B点) 估计的准确性,使用弹性心电图 (BCG) 信号.
- 优化一个耳塞原型,用于高精度的PTT测量.
主要方法:
- 在耳罩式原型中集成低噪音惰性测量单元 (IMU) 和光聚体感应 (PPG) 传感器.
- 高同步数据采集频率为450 Hz,误差为<1.1 ms.
- 开发一个多轴BCG融合算法,以提高信号噪声比 (SNR) 和B点估计精度.
- 验证B点估计与心电图 (ECG) 和阻抗心脏图 (ICG) 的基本真相.
主要成果:
- 在B点估计中,BCG融合减少了平均绝对误差 (MAE) 的5.33% (X轴) 和6.70% (Y轴).
- 使用BCG I波作为大动脉开口的代理,MAE减少了59.45% (vs. H波) 和32.09% (vs. J波).
- 该系统实现了高度同步的数据采集,这对于精确的PTT计算至关重要.
结论:
- 开发的耳罩系统为持续的,非侵入性的BP监测提供了一种实用方法.
- 先进的BCG信号处理,包括多轴融合和I波利用,显著提高BP估计的准确性.
- 这项技术有可能在现实世界的心血管健康管理中得到广泛应用.
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