Devices for opening or enlarging the visual field, e.g. of a tube of the body

Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor > Devices for opening or enlarging the visual field, e.g. of a tube of the body

Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes (examination of body cavities or body tracts using ultrasonic, sonic or infrasonic waves A61B8/12; endoscopic instruments for taking cell samples or for biopsy A61B10/04); Illuminating arrangements therefor (for the eyes A61B3/00) > Devices for opening or enlarging the visual field, e.g. of a tube of the body