Characteristics of bronchial blockers

	Cohen blocker	Arndt blocker	Fuji uniblocker	EZ blocker
Size	9 Fr	5 Fr, 7 Fr, and 9 Fr	9 Fr	7 Fr
Balloon shape	Spherical	Spherical or elliptical	Spherical	Spherical
Guidance mechanism	Wheel device to deflect the tip	Nylon wire loop that is coupled with the fiberoptic bronchoscope	Malleability allows application of rotational torque to the proximal end to position its preshaped tip	None, "Y"-shaped tip
Smallest recommended ETT for coaxial use	9 Fr (8.0 ETT)	5 Fr (4.5 ETT), 7 Fr (7.0 ETT), 9 Fr (8.0 ETT)	9 Fr (8.0 ETT)	8.0 ETT
Murphy eye	Present	Present in 9 Fr	Not present	Not present
Center channel	1.6 mm internal diameter	1.4 mm internal diameter	2.0 mm internal diameter

ETT: single endotracheal tube; Fr: french.

Modified with permission from: Campos JH. Which device should be considered the best for lung isolation: double-lumen endotracheal tube versus bronchial blockers. Curr Opin Anaesthesiol 2007; 20:27. Copyright © 2007 Lippincott Williams & Wilkins.

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Characteristics of bronchial blockers