Simulated
Tube

Isolated pig
Simulated
tracheal
motion

trachea (n = 6)
IPPV
suction
in trachea

Mallinckrodt Hi-lo
Leak
Leak
Leak
Leak
Sheridan Preformed
Leak
Leak
Leak
Leak
Portex Profile
Leak
Leak
Leak
Leak
Portex Soft-Seal
No leak
No leak
No leak
No leak

Young and Blunt Critical Care 1999 3(Suppl 1):P004   doi:10.1186/cc379