New intravascular flow sensor using fiber optics

Erik N. D. Stenow

doi:10.1117/12.197577

23 December 1994 New intravascular flow sensor using fiber optics

Erik N. D. Stenow

Proceedings Volume 2327, Medical Applications of Lasers II; (1994) https://doi.org/10.1117/12.197577
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

Abstract

A new sensor using fiber optics is suggested for blood flow measurements in small vessels. The sensor principle and a first evaluation on a flow model are presented. The new sensor uses small CO₂ gas bubbles as flow markers for optical detection. When the bubbles pass an optical window, light emitted from one fiber is reflected and scattered into another fiber. The sensor has been proven to work in a 3 mm flow model using two 110 micrometers optical fibers and a 100 micrometers steel capillary inserted into a 1 mm guide wire. The evaluation of a sensor archetype shows that the new sensor provides a promising method for intravascular blood flow measurement in small vessels. The linearity for steady state flow is studied in the flow interval 30 - 130 ml/min. comparison with ultrasound Doppler flowmetry was performed for pulsatile flow in the interval 25 - 125 ml/min. with a pulse length between 0.5 and 2 s. The use of intravascular administered CO₂ in small volumes is harmless because the gas is rapidly dissolved in whole blood.

Citation Download Citation

Erik N. D. Stenow "New intravascular flow sensor using fiber optics", Proc. SPIE 2327, Medical Applications of Lasers II, (23 December 1994); https://doi.org/10.1117/12.197577

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