Patent ID: 7736302

Claim:
A cap for an endoscope which is allowed to be fitted onto a distal end of an insertion portion of the endoscope, the cap comprising: a cylindrical portion formed so that a distal end thereof protrudes forwardly from the distal end of the insertion portion in a state where the cap is fitted onto the distal end of the insertion portion; a first opening adapted to be pressed onto a biomedical tissue surface, which is formed at the distal end of the cylindrical portion; a suction path that is connectable to a suction device; an inner cylindrical portion formed inside the cylindrical portion so that a distal end thereof protrudes forwardly from the distal end of the insertion portion; and a second opening formed at the distal end of the inner cylindrical portion so as to face in the same direction of the first opening; wherein the length of the inner cylindrical portion protruding from the distal end of the insertion portion is shorter than the length of the cylindrical portion protruding from the distal end of the insertion portion, and a gap is arranged between the inside surface of the cylindrical portion and the outside surface of the inner cylindrical portion; and the suction path directly communicates with only the gap at a portion closer to a proximal end of the insertion portion than the second opening of the inner cylindrical portion.