Optical probe

Surgery – Truss – Pad

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128635, 128637, A61B 500

Patent

active

052516334

ABSTRACT:
An improved optical probe for the invasive measurement of partial carbon dioxide pressures is disclosed that minimizes pCO.sub.2 reading drift. An optical probe for the invasive measurement of the partial carbon dioxide pressure comprises an optical fiber and a pCO.sub.2 sensor. The pCO.sub.2 sensor comprises a diffusion zone with a dye-containing gel that is optically sensitive to H.sup.+ ions and a semi-permeable membrane that is permeable to CO.sub.2 molecules, but is substantially nonpermeable to hydrogen ions Components of the pCO.sub.2 sensor, such as the part of the optical fiber extending into the sensor or a reflector, are covered with a substance--preferably with a coating--that is substantially nonpermeable to hydrogen ions. This prevents the hydrogen ions from diffusing into the sensor components, which otherwise would cause an imbalance of hydrogen ions and, therefore, a drift in the pCO.sub.2 reading.

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S. R. Goldstein et al., "A Miniature Fiber Optic pH Sensor for Physiological Use", Journal of Biomechanical Engineering, May 1980, vol. 102, pp. 141-146.
J. L. Gehrich et al., "Optical Fluorescence and Its Application to an Intravascular Blood Gas Monitoring System", IEEE Transactions on Biomedical Engineering, Feb. 1986, No. 2, pp. 117-132.

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