Photodynamic endoscopic diagnosis of tumor with fluorescence anti fading filter

摘要

Photodynamic endoscopic diagnosis of human or animal tumor tissue with a marker substance capable of flourescence and with an endoscope 3 and a light source 1 uses means 2 to guide light from the light source 1 via an endoscope 3 to the diagnosis location in each case in one of at least two selectable spectral regions, that is in a white light region and in a region with blue-violet light, in order thus in each case to be able to carry out a visual examination with white light and stimulate a marker substance deposited in any tumor tissue to fluoresce. The means for selecting the light comprises an anti-fading filter 8b which can be pivoted into the beam path of the white stimulation light on examination with white light and which filters out light, lying in spectral region stimulating fluorescence, from the white light. This anti-fading filter, together with other colour filters eg. blue stimulation light transmitting filter 8a and contrast filter 8c may be mounted on a pivoting wing 9 which can be selectively pivoted by the examining surgeon into the light path between the light source 1 and the light guide cable 2, the pivoting wing being movable by pivoting device 10.