Development of Unaware Detection System for Respiration and Heart Beats Using a Magnetic Sensor

Various vital sensors have been developed for patient monitoring. These sensors restrict patients physically or mentally since either electrodes or probes must be mounted onto a patient's body and then connected to a measuring instrument using a lead wire. In this study, a biomedical-signal detection system capable of being used without subject awareness on the basis of terrestrial magnetism was developed for home use and remote care. When a subject lies on a bed mattress that is situated on a magnetic sheet, the system detects the change in magnetic field related to respiration and heart beat. We have also developed an on-line system that can separate respiration and heart beat components from the detected signal