Colorimetric, fiber optic sensors for measuring pH, PCO.sub.2 and/or other chemical parameters of the blood. The sensors are fabricated using a single optical fiber, which is provided with a chamber at its distal end containing a pH sensitive dye. Located distal to the chamber is a white reflective surface...http://www.google.ca/patents/US5047208?utm_source=gb-gplus-sharePatent US5047208 - Blood gas monitoring sensors
