| 摘要 |
An endoscope comprising an insertion section [3] having a foremost end portion inserted into a body cavity, and connected to an operating section [1], the insertion section housing a suction path [4] of which one end is opened at the foremost end thereof and of which the other end projects into the operating section, and a suction changeover mechanism [5] arranged at the operating section. The suction changeover mechanism [5] includes a cylinder [6] having a connecting opening [6b] connected to the suction source [P], a pressure discharge opening [6a] to the outside atmosphere and a further opening [4a] connected to the other end of the suction path, and a valve [10] having a body [10a] fitted into the cylinder an a through-hole formed in the body for normal communication of the pressure discharge opening [Ga] with the connecting opening [6b]. The body resiliently shuts off the communication between the further opening [4a], the discharge opening [6a] and the connecting opening [6b] when the pressure discharge opening [6a] communicates with the outside atmosphere but is resiliently deformed due to negative pressure caused by the suction source in the cylinder to communicate the further opening [4a] with the suction path when the pressure discharge opening is shut off from the outside atmosphere. |
