In the rectoscope according to main patent ... P 3319049.6 the sight-impairing smoke or vapour which is evolved especially during coagulations in the rectum is led away to the outside, together with the inert gas which is under pressure in the rectum, via a special channel and a throttle or a valve, or is filtered out via a suction line with circulation of the gas. The gas pressure which develops in the rectum is automatically balanced by a pneumatic device.
