In an instrument for spectral measurement in the bloodstream, the light-guide probe is developed with a diameter of, at most, 0.5 mm. By plug connections with precisely defined positions of the light guides, the light guide probe is connected to an illuminating device having a xenon lamp and to a diode...http://www.google.ca/patents/US4598715?utm_source=gb-gplus-sharePatent US4598715 - Instrument for spectral measurement in the bloodstream
