脉动流
光容积图
信号(编程语言)
生物医学工程
脉冲压力
脉搏(音乐)
静水压力
血压
材料科学
压力控制
压力传感器
压力测量
计算机科学
心脏病学
物理
医学
内科学
计算机视觉
电信
机械
气象学
滤波器(信号处理)
程序设计语言
热力学
探测器
地球物理学
作者
Tuukka Panula,Jukka‐Pekka Sirkiä,Matti Kaisti
标识
DOI:10.23919/cinc53138.2021.9662866
摘要
We propose a new technique enabling continuous control of transmural pressure using the non-pulsatile (DC) component in the PPG signal as feedback. Photoplethysmograph (PPG) contact pressure has a noticeable effect on blood pressure (BP) tracking, pulse wave analysis and pulse propagation measurements. BP changes alter the difference between intra-arterial and contact pressure, called transmural pressure. Our method is based on keeping the PPG DC component constant by altering the external pressure applied. This way the pressure read from the pressure sensor equals intra-arterial BP. The technology was verified by comparing: (i) measured pressure variation induced by hydrostatic changes with theoretical values, (ii) pulse morphology with and without feedback control during hydrostatic changes, and (iii) continuous MAP readings measured with the reference device (CNSystems CNAP 500) and our device. The proposed technology performed well compared to traditional volume clamp technique while requiring significantly less complex control logic and no fast-switching pneumatics.
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