Fluorescence endoscope having an exciting light filter and a fluorescence filter
US5891016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1996 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Oct 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/2469
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.