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22 Filed: Apr. 25, 1988(57) ABSTRACT A method and apparatus for detecting the presence of Related US Application Data C2CeOS tissue using visible luminescence. The tissue

63 continuation of ser. No. 796,859, Nov. 13, 1985, aban to be amined is excited with a beat of monochro doned. matic light that causes the tissue to fluoresce over a spectrum of wavelengths. The intensity at which the (5ll Int. Cl................................................ A61B5/00 excited tissue fluoresces can be measured either over a (52) US Cl...................................... 128/665; 128/395 spectrum or at a predetermined number of preselected 58 Field of Search............ 128/633, 634, 665, 303.1, wavelengths. By determining the wavelength (s) at 128/395, 398; 356/435 which maximum intensity (ies) are attained for the tissue (56) References Cited in question and by comparing these peak wavelengths, either visually or electronically, to the peak wave length …