Patent ID: 6863650

Claim:
An endoscopic system comprising an endoscopic instrument and a light source, said endoscopic instrument comprising: a shaft, a handle arranged at a proximal end of said shaft, at least one working part arranged at a distal end of said shaft, and at least one fluorescent marking, having a fluorescing substance that can be excited to fluoresce by a light source, said marking is provided at a distal end section of said endoscopic instrument, wherein said fluorescing substance is selected in such a way that its excitation range lies in an excitation range of a tumor-specific photosensitizer applied to tissue surrounding said endoscopic instrument, said light source is selected in a way that it only emits light of specific wavelength ranges matching excitation ranges of both said fluorescent marking of said instrument and the tissue surrounding said endoscopic instrument to which said tumor specific photosensitizer has been applied, therefore said same light source can excite both fluorescence phenomena.