A human health monitoring system of systems in bed

This paper describes a human health monitoring system by an air pressure sensor and an ultrasonic sensor system. The ultrasonic sensor system can obtain the state of a patient in bed by placing it under a bed frame. That is, we can determine whether or not a patient in the bed. The air pressure sensor system can detect heart beats by placing it to the mattress on the bed. By using two sensors complementary, we can detect the behavior before getting out of bed aided by fuzzy inference technique. The system of the two sensors can complementary detects the state, heart beat, a behavior before getting out of bed. Thus, the system of the two sensor systems can noninvasively and unconsciously provide human health information with high accuracy aided by fuzzy logic.

1 Introduction

Health monitoring systems are widely used in the filed in medicine and nursing. Usually, conventional health monitoring system constrains patients, that is, electrocardiographs and electroencephalographs constrain patients. A nonconstraining health monitoring system is essential for sleeping patients because we do not have to concern ourselves with the input sensor being detached. A number of health monitoring sensors for humans in bed have been developed [1]–[4]. In our study, we attempt to detect three biological information. First one is recognition for humans in bed. We will recognize two conditions; an empty bed or a sleeping patient in bed. Second one is to monitor heart rate. The heart beat mainly shows an automatic nervous system activity, and its rate is an important parameter to influence a blood pressure change, an aspiration system, and a temperature control and so on. The third one is to detect the behavior before getting out of bed of patients to prevent accident fall from bed.