1. A pharyngeal ultrasound guide (PUG) device comprising: a hollow flexible shaft comprising two ends and an elongated body therebetweeen; a balloon arranged at a first of said two ends, said balloon being sized and shaped for placement in a pharyngeal region of a human and having an internal volume, said hollow shaft extending through said balloon; an external compartment including an ultrasound transmission medium; and a connecting tube interconnecting said external compartment and said balloon; wherein, said ultrasound transmission medium is transferred from said external compartment into said internal volume of said balloon after said balloon is placed in said pharyngeal region of said human so as to allow an ultrasound probe placed within said hollow shaft to image an adjacent region of said human.