US 5,000,173 AGranted

Respiratory aid device

OwnerDaniel Zalkin, Daniel Isabey +2inventors

InventorsDaniel Zalkin, Daniel Isabey, Laurent Brochard, Alain Harf

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Abstract

The device comprises a respiratory gas generator including means for establishing, during an inspiratory stage and in a supply pipe leading to an inspiratory orifice associated with an expiratory valve, a pressure of a respiratory gas which is substantially constant irrespective of the flow of inspiratory gas. The means for establishing a substantially constant pressure comprise an ejector of the convergent/divergent type which opens onto said supply pipe. In contrast to ventilators having multiple modes of ventilation which are usually intended for patients subjected to intubation or tracheomatization, the device is intended for patients who are connected to the device through a simple mask covering the nose and mouth, a nose mask or a mouthpiece.

Claims7

Dependent claims

A respiratory aid device comprising a respiratory aid gas generator for fluid connection between a source of gas under pressure and a patient valve having an inspiratory inlet associated with an expiratory valve, said gas generator comprising:

a gas supply pipe connectable to said inspiratory inlet and provided with a flow sensor;
a convergent/divergent ejector having an air inlet and a coaxially arranged injecting nozzle opening into said supply pipe, upstream said flow sensor and in fluid connection with said source of gas under pressure;
an electrically controllable valve for connecting said source of gas under pressure with said ejector;
and
an electronic control unit responsive to signals from said flow sensor to selectively actuate said electrically controllable valve, whereby respiratory gas at a selectable substantially constant pressure is supplied to said patient valve during an inspiratory phase.

2 more elements

Dependencies are inferred from the claim text.