Patent ID: 8568303
Filing Date: 2013-10-29
Classification: A61B

Abstract:
1. A suction conduit device of an endoscope, comprising: a treatment instrument insertion channel arranged from a distal end portion to an operation portion of the endoscope; a suction conduit disposed from the treatment instrument insertion channel in the operation portion through a branch portion for suctioning a target substance through the treatment instrument insertion channel; and a suction valve that opens/closes the conduit by reciprocally moving a piston shaft through a valve-portion passage to which the suction conduit is connected and does not use a space between the valve-portion passage and a side face of the piston shaft and an inner-shaft passage formed in the piston as a passage but uses only the valve-portion passage as a passage, wherein a diameter of the valve-portion passage of the suction valve is made larger than a diameter of the suction conduit, and wherein the suction valve is configured such that a bending passage is disposed as the valve-portion passage, and the suction valve has a bottom of the piston shaft so that the bottom of the piston shaft closes/opens one passage side of the bending passage.