Abstract: Bronchoscopy apparatus comprises a tubular bronchoscope instrument having a laser manipulator at its proximal or rear end. A gas passage element running along the length of the bronchoscope is connected via a control system to pressurized oxygen and a source of reduced pressure (suction). The control system is operable to switch between a simple ventilation mode and a suction mode. The suction mode may be prolonged to give adequate time for laser surgery. An audible alarm is activated shortly before suction is discontinued and pressurized oxygen is applied.