An endotracheal device for mechanical ventilation of a patient, the endotracheal device comprising a ventilation tube comprising: - a distal part, with a distal end, intended to be inserted into an airway of a patient, - a proximal part, with a proximal end, intended to be connected to a ventilation machine; and - a barrier that covers the ventilation tube in the distal area, and that it is configured to, when inserted, occupy, and adapt to, the morphology of the subglottic region, as well as the glottic region and also the supraglottic region of the larynx of the patient, for which the barrier has a variable cross section along the length thereof; the endotracheal device further comprising pressure means connectable to the barrier to deform the barrier, the endotracheal device being characterized in that the barrier is made of a solid viscoelastic material and comprises: - in a more distal location, a first portion, with a transverse cross section increasing from the distal end, to adapt to the subglottic region; and - in a more proximal location, a second portion, opposite from the first portion, with a transverse cross section increasing from the first portion, to adapt to the supraglottic region; wherein the pressure means comprises a flexible conduit connected to the barrier and to an air stopcock valve, so as to apply a negative pressure for collapsing the barrier before inserting the barrier into the patient and, once inserted, releasing said compression. - a distal part, with a distal end, intended to be inserted into an airway of a patient, - a proximal part, with a proximal end, intended to be connected to a ventilation machine; and - a barrier that covers the ventilation tube in the distal area, and that it is configured to, when inserted, occupy, and adapt to, the morphology of the subglottic region, as well as the glottic region and also the supraglottic region of the larynx of the patient, for which the barrier has a variable cross section along the length thereof; the endotracheal device further comprising pressure means connectable to the barrier to deform the barrier, the endotracheal device being characterized in that the barrier is made of a solid viscoelastic material and comprises: - in a more distal location, a first portion, with a transverse cross section increasing from the distal end, to adapt to the subglottic region; and - in a more proximal location, a second portion, opposite from the first portion, with a transverse cross section increasing from the first portion, to adapt to the supraglottic region; - in a more distal location, a first portion, with a transverse cross section increasing from the distal end, to adapt to the subglottic region; and - in a more proximal location, a second portion, opposite from the first portion, with a transverse cross section increasing from the first portion, to adapt to the supraglottic region; - in a more proximal location, a second portion, opposite from the first portion, with a transverse cross section increasing from the first portion, to adapt to the supraglottic region; wherein the pressure means comprises a flexible conduit connected to the barrier and to an air stopcock valve, so as to apply a negative pressure for collapsing the barrier before inserting the barrier into the patient and, once inserted, releasing said compression.