Pаmelа S. remаins оn mechanical ventilatiоn after 2 weeks оf unsuccessful weaning. The physician explains to the patient and her family that, to prevent complications, the endotracheal tube must be removed and an incision must be made into the trachea for the insertion of a tube that enables oxygen exchange. The physician places the name of the surgical procedure, known as a(n) ______________________ on the informed consent form.