背心式呼吸感应体积描记系统设计

Design of a Wearable Respiratory Inductive Plethysmograph and Its Applications

目的为解决呼吸感应体积描记技术存在的高信噪比与低系统功耗之间的固有矛盾,并消除胸、腹信号耦合干扰,研发一种新型的呼吸感应体积描记技术,并以可穿戴技术的设计理念,设计出可穿戴式呼吸感应体积描记系统。方法采用脉冲式分时激励的方案,在极短的时间内以极高的功率来依次轮流激励各传感线圈;设计了新型的传感线圈结构,将其嵌入背心中,实现了可穿戴式呼吸感应体积描记系统设计。结果获得了高信噪比(高激励功率)、低系统功耗的设计效果,消除了胸、腹信号之间的耦合干扰;背心式的系统设计,外形美观,使用方便,可用于长期动态测量使用。结论该系统性能优良,达到了设计要求,经过标定能够实现通气量无创测量,用于睡眠医学研究能够有效发现睡眠呼吸暂停事件并鉴别类型。

Objective To develop a new type of respiratory inductive plethysmograph to achieve high signal-noise rate（SNR） and low system power cost,and also to eliminate the cross-talk between chest and abdominal band sensors. Method Either of the two bands was powered by a very high power oscillator in a very short time, and these two bands were switched on in turn. The sensor structure of the respiratory inductive plethysmograph was modified so that these two bands could be embeded in a shirt conveniently. Result With these new designs,the cross-talk between these two bands was greatly eliminated and high SNR and low system power cost were achieved. This new wearable respiration monitoring system is easy to use, and can be used for long time and ambulatory monitoring. Conclusion This new system meets the design requirement with excellent performance. With this new wearable respiration monitoring system, non-invasive measurement of ventilation and non-intrusive detection of sleep apnea event can be achieved.