Table 1: Characteristics of the bronchial blockers.

Cohen blockerArndt blockerFuji uniblockerEZ blocker

Size9 F5 F, 7 F, and 9 F9 F7 F
Balloon shapeSphericalSpherical or ellipticalSphericalSpherical
Guidance mechanismWheel deviceNylon wire loopNone, preshaped tipNone
Smallest recommended *SLET for coaxial use9 F—8.0 SLET5 F—4.5 SLET
7 F—7.0 SLET
9 F—8.0 SLET
9 F—8.0 SLET7.5
Murphy eyePresentPresent in 9 FNot presentNo
Center channel1.6 mm I.D.1.4 mm I.D.2.0 mm I.D.1.4 mm I.D.

*SLET = Single-lumen endotracheal tube.