Endoscope with treatment tool delivery port and elevator

1 . An endoscope comprising:

a distal end part body that is provided on a distal end side of an insertion part and has a distal end, a proximal end, and a longitudinal axis;

a treatment tool delivery port that is formed in the distal end part body and delivers a treatment tool inserted into the insertion part;

an elevator that is rotatably supported in the treatment tool delivery port of the distal end part body and controls a delivery direction of the treatment tool delivered from the treatment tool delivery port; and

a first illumination window that is provided on the distal end part body, the first illumination window is configured to emit illumination light,

a second illumination window provided at a position on an other direction side opposite to a one direction side in the width direction with respect to the proximal end side region in the distal end part body,

an observation window that is provided at a position closer to a proximal end side of the distal end part body than the treatment tool delivery port in the distal end part body,

wherein the first illumination window is provided in a proximal end side region at a position shifted from the treatment tool delivery port to the proximal end side of the distal end part body in the distal end part body,

wherein the first illumination window is disposed closer to the proximal end of the distal end part body than both the treatment tool delivery port and the elevator,

wherein in a case where a direction perpendicular to both the longitudinal axis and a normal direction of an opening surface of the treatment tool delivery port is a width direction of the treatment tool delivery port, the proximal end side region in which the first illumination window is disposed is a region in the distal end part body, which is located closer to the proximal end side of the distal end part body than the treatment tool delivery port and is present within a range in which the treatment tool delivery port is formed in the width direction,

wherein a first illumination range of illumination light emitted from the first illumination window includes an observation range of the observation window,

wherein in a case where a direction perpendicular to both the longitudinal axis and a normal direction of an opening surface of the treatment tool delivery port is a width direction of the treatment tool delivery port, the observation window is provided at a position on one direction side in the width direction with respect to the proximal end side region in the distal end part body,

wherein the second illumination window illuminates a second illumination range that partially overlaps the first illumination range and includes the observation range.

2 . The endoscope according to claim 1 , further comprising:

an elevator support member that is coupled to one end part of the elevator and rotatably supports the elevator between an elevated position and a lodged position,

wherein the other end part of the elevator opposite to the one end part is provided at a position closer to a distal end side of the distal end part body than the first illumination window at least in a case where the elevator is at the lodged position.

3 . The endoscope according to claim 1 ,

wherein in a case where a direction perpendicular to both the longitudinal axis and a normal direction of an opening surface of the treatment tool delivery port is a width direction of the treatment tool delivery port, a first illumination axis of the first illumination window is inclined toward a distal end side of the distal end part body from a posture perpendicular to both the width direction and the longitudinal axis, and

the proximal end side region in which the first illumination window is disposed is an inclined surface having the first illumination axis as a normal line.

4 . The endoscope according to claim 1 ,

wherein both a first illumination axis of the first illumination window and a second illumination axis of the second illumination window are inclined toward a distal end side of the distal end part body from a posture perpendicular to both the width direction and the longitudinal axis, and

a second illumination axis angle is smaller than a first illumination axis angle in a case where an inclination angle of the first illumination axis with respect to a reference axis parallel to the longitudinal axis as seen from the width direction side is the first illumination axis angle and an inclination angle of the second illumination axis with respect to the reference axis as seen from the width direction side is the second illumination axis angle.

5 . The endoscope according to claim 4 ,

wherein an observation axis of the observation window is inclined toward the distal end side of the distal end part body from the posture perpendicular to both the width direction and the longitudinal axis, and

an observation axis angle is equal to the first illumination axis angle in a case where an inclination angle of the observation axis with respect to the reference axis as seen from the width direction side is the observation axis angle.

6 . The endoscope according to claim 1 , further comprising:

an ultrasound transducer that is provided in the distal end part body and is located closer to a distal end side of the distal end part body than the treatment tool delivery port.

7 . The endoscope according to claim 1 , wherein

the first illumination window is disposed on a first inclined surface,

the second illumination window is disposed on a second inclined surface, and

an inclination angle of the first inclined surface and an inclination angle of the second inclined surface are different from each other.