Conduit control device

A conduit control device that is provided in an operation section of an endoscope and switches a communication state of a conduit provided inside the endoscope, the conduit control device comprising:

• a cylinder member;
• a piston member, a shaft section of which is provided to be slidable into the cylinder member, the piston member including a button section at a top of the shaft section;
• an attachment section including a rigid cylinder detachably attachable to a vicinity of an opening of the cylinder member in an exterior of the operation section and including a through-hole through which the shaft section is inserted and an elastic cylinder integrally formed on an outer circumferential surface of the rigid cylinder;
• a compression spring suspended between the button section and the rigid cylinder, the compression spring urging the piston member with respect to the rigid cylinder in a direction in which the button section projects from the opening;
• a first elastic member provided on the projecting direction side with respect to a position at which one end of the compression spring comes into contact in the button section, the first elastic member being brought into contact with a contact surface, which is provided on an inner circumferential surface of the rigid cylinder, and elastically deformed to thereby seal a gap between the attachment section and the piston member in a state in which the piston member is depressed via the button section;
• and
• a second elastic member provided in a position of the elastic cylinder in contact with the exterior of the operation section, the second elastic member being brought into contact with the exterior and elastically deformed to thereby seal a gap between the attachment section and the exterior in a state in which the piston member is depressed via the button section.