Surgery – Truss – Pad
Patent
1986-07-14
1989-01-31
Coven, Edward M.
Surgery
Truss
Pad
128664, 128666, 356437, 356440, A61B 500
Patent
active
048008869
ABSTRACT:
Apparatus and methods are provided for determining the concentration of a gaseous component in a fluid. A solid body of a natural or synthetic high polymer, which is permeable to the gaseous component, is exposed to the fluid, the polymer is exposed to infrared radiation, and the infrared absorption by the gas in the polymer is measured. In the preferred embodiment, a sensor is provided for making in vivo measurements of the concentration of CO.sub.2 in the blood. The sensor includes an optical fiber which is nonpermeable to CO.sub.2 and substantially transparent at the CO.sub.2 absorption wavelength range, and a solid body of polymeric material at the distal end of the fiber which is substantially transparent to the absorption wavelength range and permeable to CO.sub.2. An incident infrared signal is transmitted down the fiber, passes through the body, is reflected off the distal end of the body, and the intensity of the return signal is measured by a detector. The return signal is diminished in proportion to the concentration of the CO.sub.2 in the polymeric body. The sensor is disposed within a catheter and is positionable within the narrow blood vessels of the body for continuous real time monitoring of the carbon dioxide concentration of the blood.
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C. R. Bard Inc.
Coven Edward M.
Hanley John C.
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