Lung-ventilator adapted for patients under intravenous anaesthesia

The invention relates to a lung ventilator that includes a control unit (3a), at least one gas delivery hose (4), and a patient-allocated or -related device, wherein one end part of the hose faces towards the control unit and the other end part of the hose faces towards said device. The control unit (3a) includes means for passing an inhalation gas flow or an insufflation gas flow to the patient, and an expiration valve (6) is adapted to allow expiration gas to flow to the free surroundings, said expiration valve being controllable to either one of two functional states. A reserve volume (7') in a container (7) or bag is adapted to generate manually a gas flow, intended to an insufflation phase, wherein this gas flow can be actuated by applying pressure to the container temporarily and over or during a short tie period. The thus pressurised reserve volume in the container or bag is delivered to the hose (4c), which is connected directly to the patient-allocated or related device (5, 6).