Abstract: Methods and apparatus for administering CPAP to a patient are disclosed. The method includes providing a controllable flow of gas from a source to a patient creating a continuous positive airway pressure and controlling the flow of gas so that it is periodically modified to inject a sigh cycle into the CPAP. The administration of sigh cycle inclusive CPAP is useful for the treatment of respiratory dysfunction and for stimulating the release of surfactant in immature lungs. It is preferred to monitor the airway pressure and to inject the sigh cycle when a drop in pressure is detected. The apparatus centers on a driver used in conjunction with a gas delivery. The driver includes a valve, adapted to receive gas from a source, for regulating the flow of gas to the delivery device in response to a control signal. A controller, connected to the valve, generates the control signal so that the valve periodically modifies the flow of gas, thereby injecting a sigh cycle.

Abstract: A device for generating by ejector action a continuous positive airway pressure (CPAP), comprising a breathing-channel which at one end opens into the atmosphere and at another end is adapted to be provided with an attachment device to the nose and/or mouth of the patient. An inlet channel is connected with the breathing-channel at a point between its ends for fresh gas, the flow of which may be adjusted to obtain an adjustable positive pressure within the breathing-channel. The breathing channel (10) has a first branch-channel (11) which is connectable to the attachment device and a second branch-channel (12) which opens into the atmosphere, the two branch-channels together forming an acute angle (A) of 30.degree.-50.degree. with each other. The inlet channel (13) is situated in the extension of the first branch-channel (11) and is connected to the second branch-channel (12) in such a manner that the stream of fresh gas is directed mainly co-axially into the first branch-channel, producing an ejector action.