| 摘要 |
A ventilator for supplying and emitting respiratory gas to and from the airways of a human being or an animal, respectively, is provided. The ventilator comprises a multiple-function safety valve (6) located between a control valve and the airways. The safety valve (6) is affected in its closing direction by two springs (13), which apply force that corresponds to a predetermined overpressure and in its opening direction by a spring loaded piston (22), which applies force that exceeds the force of the springs (13). By starting the ventilator, an electromagnet (20) is connected. The electromagnet (20) pulls the piston (22) against the force from the spring load (21), and the safety valve (6) closes. By means of a control device, the pressure in the inspiration section (3) can be supervised and the electromagnet (20) disconnected at a programmed overpressure. At power failures, the safety valve (6) will open and air can pass through the open safety valve (6) to the airways. <IMAGE> |
