Abstract: An object of the present invention is to provide a bronchoscope facilitating observation of a peripheral bronchus, and a method of using the same. The bronchoscope includes: a sheath having a longitudinal axis direction, the sheath having a first lumen and a second lumen each extending in the longitudinal axis direction; an endoscopic camera disposed in the first lumen; and a balloon catheter including a shaft inserted to the second lumen to be shiftable in the longitudinal axis direction and a balloon provided at a distal portion of the shaft, wherein the balloon has a pressurization lumen to be provided with fluid to receive positive pressure, and the second lumen is configured to receive negative pressure to cause a distal end of the sheath to stick to an inner wall of a bronchus.

Abstract: An object of the present invention is to provide a medical instrument set facilitating safe observation of a peripheral bronchus portion, and a method of using the same. The medical instrument set includes a bronchoscope including a sheath having a longitudinal axis direction, the sheath having a first lumen and a second lumen each extending in the longitudinal axis direction, an endoscopic camera disposed in the first lumen, and a balloon catheter including a shaft inserted to the second lumen to be shiftable in the longitudinal axis direction and a balloon provided at a distal portion of the shaft; and a probe having a distal end positioned distally beyond a distal end of the balloon, the probe configured to detect a peripheral bronchus portion.