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Proceedings Paper

Fiber Optic Microsensor For Continuous In-Vivo Measurement Of Blood Gases
Author(s): J. Tusa; T. Hacker; D. R. Hansmann; T. M. Kaput; T. P. Maxwell
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Paper Abstract

A disposable sterile fiber optic probe has been developed to continuously monitor blood gases while residing within a 20 gauge radial artery catheter. Blood pH and dissolved 02 and CO2 are measured independently in three high n.a. 115/100 micron fibers by means of fluorescent indicators embedded in specialized membranes at the probe tip. Excitation of the fluorescent dyes is performed with a pulsed Xenon bulb; fluorescence detection with silicon photodiodes; and separation of excitation and emission is accomplished with a small cube beamsplitter located between two quarter-pitch SELFOC lenses. One of these SELFOC lenses is part of the disposable connector leading to the probe, the other leads to the excitation source via 250/200 micron fibers. The disposable portion is designed to be disconnected and reconnected without loss of calibration, requiring connector throughput reproducibility of 0.25%. System drift is typically less than 2% per 24 hours, after a 30 minute warm-up. Numerous practical problems with the fibers, connectors, SELFOC lenses, background fluorescence, system calibration, accuracy and drift have been encountered and will be discussed.

Paper Details

Date Published: 1 April 1987
PDF: 7 pages
Proc. SPIE 0713, Optical Fibers in Medicine II, (1 April 1987); doi: 10.1117/12.937385
Show Author Affiliations
J. Tusa, Cardiovascular Devices, Inc. (United States)
T. Hacker, Cardiovascular Devices, Inc. (United States)
D. R. Hansmann, Cardiovascular Devices, Inc. (United States)
T. M. Kaput, Cardiovascular Devices, Inc. (United States)
T. P. Maxwell, Cardiovascular Devices, Inc. (United States)

Published in SPIE Proceedings Vol. 0713:
Optical Fibers in Medicine II
Abraham Katzir, Editor(s)

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