L'air Liquide

Taema

Roger Champain

Daniel Zalkin

Nourredine Kissi

Gilbert Theurant

The turbine which generates overpressure for a breathing gas is controlled by detecting recurring variations in the operation of the turbine and correspondingly modifying the control signal which is set to a level which determines the overpressure of the turbine, thereby modulating the overpressure supplied by the turbine.

Apparatus for providing a breathing gas with an overpressure and process

The control device is applicable in particular in the control of the injection of oxygen in the course of an oxygen treatment through a nasal mask. The device comprises a sealed chamber (5) in which are disposed, on one hand, a very pliable bladder (6) one side of which is subjected to atmospheric pressure while the other side is subjected to the depression which must be detected, and, on the other hand, an opto-electronic sensor (7), the bladder being connected to a movable screen (9) capable of intercepting or not intercepting, depending on the state of the bladder (6) and consequently of the depression to be detected, the light beam between the light beam emitter and the receiver of the opto-electronic sensor (7).

Device for controlling the pressure of a fluid and injection system for

The invention relates to the supply of superoxygenated air to a patient during a part of the inspiratory phase. An electrically controlled supply valve is opened as soon as the sensor of a detector receives a depression signal due to a start of inspiration. This produces a voltage which is compared with a reference voltage corresponding to the atmospheric pressure previously stored in a memory. The duration of the injection is counted and is proportional to the duration of the non-injection which is dependent on the duration of the expiratory phase.

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Les Loges en Josas, France

Roger Champain