Implementation of a vital signs monitoring system in combination with a bed-leaving detection system

In this study, a bed-leaving detection system using piezoelectric sensors was proposed to monitor vital signs of the human body such as arterial blood pressure, breathing motion, and body movement. This study reports on the details of a fast and concise algorithm designed to detect vital signs from vibration signals that are recorded via piezoelectric sensors installed inside a pillow and under a mattress or futon. The performance and accuracy of the algorithm are examined by experiments. In addition, the signal differences between sleeping, awakening, and bed-leaving states were analyzed so that a status classification method was developed. The incorporation of the vital signs monitoring feature into the bed-leaving detection system is expected to enhance the judge rate of the bed-leaving detection system. Furthermore, this will offer a concise vital signs monitoring function at a lower cost.