Ultrasonic diagnosis device

Claim 1

An ultrasonic wave diagnosis device comprising: an insertion section having one end which is insertable into a body cavity, another end which is located outside the body cavity, and a central axis; a control section connected to said another end of the insertion section; an ultrasonic wave transmission/reception scanner disposed at said one end of the insertion section and having an ultrasonic wave oscillator therein; a balloon inflatable toward the outside and surrounding said ultrasonic wave transmission/reception scanner disposed at said one end of the insertion section; means disposed in said insertion section for supplying an ultrasonic wave propagation liquid medium to the balloon disposed in said insertion section to inflate the balloon; said insertion section having a recess formed in part of a circumferential side surface thereof, which is in the vicinity of said balloon; and an observation optical system disposed within the recess and having a field of sight toward the balloon, said observation optical system including an observation window and an illumination window; and said recess having one inner surface which is inclined toward the central axis of the insertion section from the insertion section to the balloon such that said inclined inner surface of the recess is inclined toward the balloon, and said observation optical system being disposed in said one inclined inner surface of said recess.