Non-constrained and Non-invasive Measurement of Pulse Pressure Waves from Patients in a Supine Position and Development of a Health Monitoring System for Bedridden Individuals

 Tsuji Toshio 

Research Summary

A 24-hour monitoring system must fulfill the following
requirements: (1) it must detect urgent dangers such as
arrhythmia and the cessation of breathing and alert a
healthcare professional; (2) it must detect chronic dangers to
the circulatory system such as abnormal blood pressure and
arteriosclerosis; (3) it must have prophylactic functions to
prevent decubitus ulcers in quadriplegic patients; (4) it must
be able to monitor the patient’s biological signals in a nonconstrained
manner over a long period; and (5) it must be
easy to use.

Most patients with cervical spinal cord injuries receive
treatment at home, and those suffering from related
quadriplegia need life support and round-the-clock monitoring
from a care worker, a healthcare professional or a family
member. However, as it is difficult for such observers to
constantly monitor the patient’s condition, a system that can
perform this task in place of an observer is required.

We developed a monitoring system that can be used to prevent decubitus and measure pulse pressure waves/
breathing waves via a pair of air-pack-type pressure sensors in a non-constrained and non-invasive manner.

Appeal Point

This system can be used to measure pulse pressure waves and breathing waves in a non-constrained and noninvasive
way. A distinctive feature of the system is that it can calculate the cardiac rate and the augmentation index
simultaneously and automatically. It is useful in the diagnosis and monitoring of bedridden patients.


Japanese Patent Application No. 2009-118095 abdominal aortic aneurysm detecting device

Industry-Academia and Community Collaboration at Hiroshima University
Copyright © 2019 - Hiroshima University. All Rights Reserved.