Fluorescence endoscope having an exciting light filter and a flu

Details Fluorescence endoscope having an exciting light filter and a flu Fluorescence endoscope having an exciting light filter and a flu

1996-10-30

1999-04-06

Leubecker, John P.

Surgery

Endoscope

Having imaging and illumination means

600160, 600476, A61B 106

Patent

active

058910166

ABSTRACT:
An exciting light filter through which exciting light which is adapted to radiate fluorescence from a living tissue is transmitted, is provided in an illumination light path defined between a light source which emits the illumination light and an object to be observed, in a fluorescence endoscope. A fluorescence filter which permits fluorescence which is radiated from the living tissue due to the illumination by the exciting light and whose wavelength is longer than that of the exciting light to pass therethrough but does not permit the exciting light to pass through the fluorescence filter, is provided in an observation light path defined between the object and a viewing portion in which an image of the object is viewed. There is a difference of 20 nm to 40 nm between the longest wavelength of the wavelength band of which more than 10% are transmitted through the exciting light filter and the shortest wavelength of the wavelength band of which more than 10% are transmitted through the fluorescence filter.

REFERENCES:
patent: 4821117 (1989-04-01), Sekiguchi
patent: 5102625 (1992-04-01), Milo
patent: 5507287 (1996-04-01), Palcic et al.
Japanese Unexamined Patent Publication No. 4-150845.

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