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. <EOS>