Whether the correlation between gas incision tip pressure fluctuations (ΔPtt) and esophageal pressure fluctuations (ΔPes) is a potential measure of spontaneous respiratory effort in patients undergoing gas incision offline.

Inclusion Criteria:

• Adult patients (≥18 years old), regardless of gender
• Tracheostomized patients with spontaneous breathing;
• Weaning criteria: under the condition of mask oxygen inhalation at 5L/min, SPO2 > 94%, PaO2/FiO2 > 150 - 200.
• The patient has stable hemodynamics and pH ≥ 7.32;
• Agree to participate in this trial and sign the informed consent form.

Exclusion Criteria:

• Patients with contraindications for esophageal catheter insertion and unable to monitor esophageal pressure;
• Patients with bleeding risks: severe coagulation disorders, esophageal varices；
• Local injuries: basilar skull fracture, maxillofacial fracture;
• Pregnant women;
• Patients considered not suitable by the researcher.