The probe (1A) has tubular conduits (3) partially introduced in nares (4) of a nose of a patient and supplied with respiratory gas (G). Flexible lateral tubes (7) are introduced in the nares of the nose of the patient. Each of the tubes is made of silicone. Each conduit includes a lateral port (8) that is arranged in a lateral wall of the conduit, and is in opposite to one of the lateral tubes. The lateral tubes are deformed under the effect of the gas jet to apply the gas jet against an inner wall (4A) of the nares to maintain the probe in the nares.
