Patent ID: 8262565

Claim:
An endoscope system comprising: an endoscope in which an endoscope insertion portion that is inserted into a body extends from an endoscope operation portion that an operator controls; a working channel that opens to a distal end portion of the endoscope insertion portion and passes through the endoscope, with its proximal end portion opening to the endoscope operation portion; a connection conduit that branches from a branch portion formed in the proximal end portion of the working channel; a suction conduit for suctioning tissue, being connected to a suction unit through the inside of the endoscope; a tissue recovery device that is inserted into the connection conduit and a distal end of the suction conduit and is capable of trapping tissue which is drawn into the working channel by a suction of the suction unit via the suction conduit; and an attachment that removably attaches a portion of the working channel that includes the branch portion and the distal end portion of the suction conduit with respect to the endoscope operation portion as one piece, wherein the attachment has a bypass conduit that bypasses the tissue recovery device to allow communication between the connection conduit and the suction conduit, with the bypass conduit being blocked when the tissue recovery device is attached and opened when the tissue recovery device is removed.