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 |
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