Respiratory assist device (1) for a patient that contains a tubular element that forms a main channel (5) (207) that is intended to be connected by its distal end (3) to a patient's airway, connecting said main channel in outside the respiratory system of said patient by its proximal end (2), said device also containing at least one auxiliary channel (8) (209) that allows injection through the distal exit holes (17) of the channel ( es) auxiliary (s) of jets of breathable gas (s) intended for the ventilation of said patient, said outlet orifices leading to said main channel in the vicinity of the distal end (3) of the latter, the diameter of each of the distal outlet orifices being less than 150 micrometers, the deflection means (14b) (14a) allowing the deflection of the jets of breathable gas (s) into said main channel, characterized by It contains at least one exit hole in the form of an annular or semiannular band that results from the union of at least some of the distal exit holes, the thickness of each exit hole being in the form of a band less than 150 microns.Dispositivo de asistencia respiratoria (1) para un paciente que contiene un elemento tubular que forma un canal principal (5) (207) que está destinado para conectarse por su extremo distal (3) a una vía respiratoria del paciente, conectando dicho canal principal en el exterior el sistema respiratorio de dicho paciente por su extremo proximal (2), conteniendo dicho dispositivo además al menos un canal auxiliar (8) (209) que permite la inyección por los orificios de salida distales (17) del/de los canal(es) auxiliar(es) de chorros de gas(es) respirable(s) destinado(s) para la ventilación de dicho paciente, conduciendo dichos orificios de salida a dicho canal principal en las proximidades del extremo distal (3) de este último, siendo el diámetro de cada uno de los orificios de salida distales inferior a 150 micrómetros, permitiendo los medios de deflexión (14b) (14a) la deflexión de los chorros de gas(es)
