| 摘要 |
An apparatus for administering a gas other than ambient air to a patient via the airways, comprising a face mask provided with fitting means which can be fitted over the nose and mouth on the patient's face, thereby forming a breathing space closed off in a substantially leakproof manner, an air supply for supplying ambient air which opens into the breathing space via a check valve which closes upon exhalation, which air supply is provided with manually operable blocking means, an evacuation line which opens into the breathing space via a check valve which closes upon exhalation, for evacuating, from the breathing space, gas present therein, and a supply of gas with gas other than ambient air which opens into the breathing space, which supply is provided with a demand valve which opens at a predetermined underpressure in the breathing space which is caused by inhalation with blocked air supply line. |
