The EG-3870UTK is a large-channel (3.8 mm), linear-array, ultrasound video endoscope that incorporates a large working channel to permit 10Fr. stent delivery. The new EG-3870UTK also utilizes an improved linear-array ultrasound transducer that provides a larger field of view with improved image quality, as well as a color chip CCD that produces full-screen, vivid endoscopic images. The updated two-stage suction valve provides both channel and balloon suction with the touch of a single button. For added convenience, the ultrasound connector is fully immersible. The EG-3870UTK is capable of 5, 7.5, 10 MHz ultrasound frequencies and a wide spectrum of imaging layers.