A novel unconstrained cardiorespiratory monitoring system during sleep

摘要

As one of the basic means of assessing human health conditions, cardiorespiratory monitoring during sleep has been widely used in diagnosis of sleep disorders. In this paper, a novel method for unconstrained and non-invasive measurement of respiration and heartbeat is proposed. The method is based on the intelligent combination of two sensor systems for respiratory and pulse monitoring. In order to wear comfortable, polyvinylidene fluoride (PVDF) film was taken as the sensor material. For improving the sensor sensitivity, a double-sided arch spring and a thin-shell spring were designed as the substrate of respiratory sensor and pulse sensor, respectively. To obtain clear cardiorespiratory responses from the sensor probe, hardware filter circuit is applied for further data filtering. Relative cardiorespiratory signal parameters such as respiratory cycle (RC) and heart rate (HR) could be displayed by LabVIEW. The fabrication steps and some experiments results for human monitoring system are described. The results show that respiration and pulse signal can be obtained accurately and the method lays the foundation for medical diagnosis.