A fibre optic Bragg grating strain sensor for monitoring ventilatory movements

Abstract

A fibre optic Bragg grating sensor to measure the strain in the chest of patients is described. The sensor provides a new method to measure ventilatory movements and it can also determine the respiratory frequency spectrum. The apparatus uses a fixed optical filter reference scheme to reduce the overall cost and is able to detect respiratory movements with frequency components up to 10 Hz. Ventilatory signals were acquired from slow breathing, with 500 ml inspiration volume, to fast, with a reduced volume of 60 ml, respiration. The sensor described here can be used to trigger the pulse burst of electrically assisted ventilation processes or to monitor high frequency oscillatory ventilation.

Fiber-optic sensors for monitoring patient physiological parameters: a review of applicable technologies and relevance to use during magnetic resonance imaging procedures

“…The literature provides a number of descriptions in which a single FBG [115][116][117][118] or multiple FBGs [97][98][99][100][101][102][103][104][105][106]114,[119][120][121][122][123] act as the main sensing elements for acquiring body movements caused by respiratory and/or heart function. In both cases, FBGs can be embedded in the clothing worn by the patient during monitoring [97][98][99][100][101][102][103][104][105][106][115][116][117][118][119][120][121][122] or mounted in the bed on which the person lies, as shown in Fig.…”

Long-period grating fiber-optic sensors of bending for applications in pulmonology

“…Senzori pomeraja i savijanja na bazi rešetki imaju širok dinamički opseg pa su pogodni za merenje površinskih respiratornih i kardiovaskularnih pulsacija [7,8,9].…”

“…Ostali novi metodi su još uvek u fazi ispitivanja, a meñu njima i metodi koji koriste fiber-optičke senzore vlažnosti [23], protoka [22], savijanja [24] i istezanja [8].…”

Photonic Sensors Based on Flexible Materials with FBGs for Use on Biomedical Applications

“…However, this can be unsuitable, due to the potential occurrence of thermal or electrical burns associated with oximeter sensors and cables, temperature probes and MRI surface coils. These burns can be a result of inductions during MRI exams (Dempsey M. F. et al, 2001;Jones S. et al, 1996) or even during cardiothoracic surgeries (Wehrle G. et al, 2001). Therefore, the use of optical fibers can be an interesting solution for measuring the cardio-respiratory frequency.…”