- According to the invention, this device (d2) comprises a tubular element (25), of the auxiliary channels (29) injecting a respiratory gas jets in a continuous manner, the deflection means (28) forming the convergence of said jets of breathing gas inside the tubular element (25) and a local restriction (r2) of the internal cross-section of this latter.- Selon linvention, ce dispositif (D2) comporte un élément tubulaire (25), des canaux auxiliaires (29) injectant des jets de gaz respiratoire en continu, des moyens de déflexion (28) faisant converger lesdits jets de gaz respiratoire à lintérieur de lélément tubulaire (25) et une restriction locale (R2) de la section interne de ce dernier.
