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Proceedings Paper

New intravascular flow sensor using fiber optics
Author(s): Erik N. D. Stenow
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Paper 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.

Paper Details

Date Published: 23 December 1994
PDF: 8 pages
Proc. SPIE 2327, Medical Applications of Lasers II, (23 December 1994); doi: 10.1117/12.197577
Show Author Affiliations
Erik N. D. Stenow, Linkoping Univ. (Sweden)

Published in SPIE Proceedings Vol. 2327:
Medical Applications of Lasers II
Stephen G. Bown; J. Escourrou; Frank Frank; Herbert J. Geschwind M.D.; Guilhem Godlewski M.D.; Frederic Laffitte; Hans H. Scherer M.D., Editor(s)

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