A newly developed tracheal tube offering ‘pressurised sealing’ outperforms currently available tubes in preventing cuff leakage: A benchtop study

BACKGROUND: No currently used tracheal tube offers full protection against aspiration of oropharyngeal secretions into the lower airways. OBJECTIVE: We developed a tracheal tube equipped with two polyvinylchloride (PVC) cuffs with a supplementary port opening between the cuffs through which a continuous positive pressure of 5 cmH2O is provided [double-cuffed PVC (PVCdc)]. We compared this PVCdc with four different cuff types (cylindrical PVC, conical PVC, cylindrical polyurethane and conical polyurethane). DESIGN: A comparison study using an in-vitro benchtop model of an artificial rigid trachea. INTERVENTIONS: Tracheal tubes were placed in the artificial trachea. Both cuffs were kept inflated at 25 cmH2O. Total 3 ml dyed water was placed above the cuff and leakage recorded under static and dynamic [5 cmH2O positive end-expiratory pressure (PEEP) alone or positive pressure ventilation plus 5 cmH2O PEEP] conditions. At the end of the dynamic experiments, PEEP was zeroed (PEEP alone) or the tracheal tubes were disconnected from the ventilator (positive pressure ventilation plus PEEP). RESULTS: In the static model, leakage flows [medians (range)] were 9.8 (6.2 to 20) for the cylindrical PVC, 1.3 (0.2 to 3.8) for the conical PVC, 0.03 (0.007 to 0.1) for the cylindrical polyurethane, 0.04 (0.003 to 0.2) for the conical polyurethane and 0.0 (0.0 to 0.0) ml min−1 for the PVCdc cuff (P 

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