Fig. 2. (A ) Nonlubricated tracheostomy tube high-volume, low-pressure cuff inflated to 30 cm H2O in a rigid cylinder. Leakage occurs along channels in the cuff wall. (B ) Lubricated tracheostomy tube high-volume, low-pressure cuff inflated to 30 cm H2O in a rigid cylinder. The figure shows prevention of leakage because channels in the cuff wall are blocked by the gel.