Fiber Optic Microsensor For Continuous In-Vivo Measurement Of Blood Gases

J. Tusa; T. Hacker; D. R. Hansmann; T. M. Kaput; T. P. Maxwell

doi:10.1117/12.937385

1 April 1987 Fiber Optic Microsensor For Continuous In-Vivo Measurement Of Blood Gases

J. Tusa, T. Hacker, D. R. Hansmann, T. M. Kaput, T. P. Maxwell

Proceedings Volume 0713, Optical Fibers in Medicine II; (1987) https://doi.org/10.1117/12.937385
Event: Cambridge Symposium-Fiber/LASE '86, 1986, Cambridge, MA, United States

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.

Citation Download Citation

J. Tusa, T. Hacker, D. R. Hansmann, T. M. Kaput, and T. P. Maxwell "Fiber Optic Microsensor For Continuous In-Vivo Measurement Of Blood Gases", Proc. SPIE 0713, Optical Fibers in Medicine II, (1 April 1987); https://doi.org/10.1117/12.937385

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