| abstract |
An endoscopic instrument, comprises 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 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 instrument. Said fluorescing substance is selected in such a way that its exciting range lies in an excitation range of a tumor-specific photosensitizer or in an excitation range of a tissue autofluorescence. |