title: A system for monitoring cardiac vibration, respiration, and body movement in bed using an infrared.
abstract: We have developed a non-invasive system for monitoring cardiac vibrations, respiration and body movement of in-bed hospitalized patients and elderly people who need constant care. These physiological parameters are recorded by an infrared emitting diode and a photo transistor, which are attached between spring coils in bed mattress. The infrared emitting diode diffuses infrared light into the mattress. The diffusion of this energy is changed by mattress shape variations and spring coil vibrations, which modulate the intensity of the received infrared signal. The intensity is also modulated by physiological parameters such as heart pulse, respiration and body movement. The physiological parameters are detected from the received infrared intensity signal by low, high and band pass filters.
authors.affiliation: Department of Health Science, Hiroshima Institute of Technology, 731-5193 Japan. hiro@cc.it-hiroshima.ac.jp
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Maki
authors.forename: Hidekuni
authors.initials: H
authors.lastname: Ogawa
authors.forename: Sosuke
authors.initials: S
authors.lastname: Tsukamoto
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Yonezawa
authors.forename: W Morton
authors.initials: WM
authors.lastname: Caldwell
mesh_terms: D000328:Adult; D001513:Beds; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006801:Humans; D007259:Infrared Rays; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D009068:Movement / Q000502:physiology*; D011187:Posture; D012119:Respiration; D014732:Vibration; D058067:Wavelet Analysis; D055815:Young Adult