Device for respiratory assistance

A device for respiratory assistance comprising a tube (4) which forms a main channel (5) and which is intended to be connected via its distal end (3) to the respiratory tract of a patient so that said main channel (5) connects the respiratory system of said patient to the outside, said device moreover comprising at least one auxiliary channel (8) connected to a source of respirable gas (25) so as to permit the insufflation of a jet of such a respirable gas into said respiratory system, and opening into said main channel (5) in the vicinity of the distal end (7) of the latter, wherein, in the conduit (28) connecting said source of respirable gas (25) to said auxiliary channel (8), said device includes:

• toward said source (25), a device for loss of head (30) which is able to limit the flow rate and the pressure of said respirable gas available at the outlet of said source (25), and to impose on said jet of respirable gas a predetermined flow rate value and a predetermined pressure value;
• and
• toward said auxiliary channel (8), a calibrated exhaust valve (32) which is able to bring said conduit (28) into communication with the atmosphere when the pressure in said conduit (28) exceeds said predetermined pressure value.