| 摘要 |
Apparatus for the administration of gases such as oxygen, anaesthetic gases, and the like, incorporating a chamber adapted to communicate with a face mask, a gas delivery conduit for delivering gas into the chamber, a control valve manually operable to start and stop delivery of gas thereto, a vent opening for intermittently venting the chamber to atmosphere for exhalation, a valve stem and a valve operating button thereon, the valve stem extending through the vent opening to the exterior of the chamber, a vent closure comprising the inner surface of the valve button, closing the vent opening when the button is operated to start delivery of gas to the chamber, a pressure relief valve communicating with the chamber for discharging to atmosphere in the event of an overpressure occuring therein, while the vent closure is in position closing the vent opening; a gas bypass connection connecting with the gas delivery conduit for receiving gas independently of the control valve; a gas bypass flow valve manually operable between open and closed positions, and a gas bypass delivery conduit connecting with the chamber for delivery of gas directly thereto independently of the control valve.
|
