The device has two fibers in it.
Bronchial lavage is considered safe and effective by some, and life-threatening by others.
Through the bronchoscope, lidocaine is squirted ahead of the scope, so there is never any pain. As the tube goes through the windpipe there is sometimes the feeling of needing to cough, but depending on the lidocaine efficacy, I don't think this always occurred. This induces very effective coughing, and you will be holding a little suctioner at your mouth, to suck gunk outta your mouth. Also you'll be on like 15L blow-by, so your sats probably won't even dip. Then when a great deal has been cleared and you feel like everything is up, either Tobra or Colistin can be instilled through the tube, thus reaching the newly cleared deep parts of the lung.