A tracheotomy device with a disposable flexible sheath furnished with a main channel for insertion of a support carrying endoscopic surgical instruments insertable in a trachea and a secondary channel for insertion of a perforation needle. The sheath has a spout curved in the perforating direction or susceptible of bending and configured as a dilator body having tapered shape so as to enter the hole formed in the trachea and to progressively dilate it.
