Endoscope operation section and endoscope including endoscope operation section

1. An endoscope operation section comprising:

an operation body having a longitudinal axis, the operation body comprising:

a bending operation lever provided at the operation body, the bending operation lever configured to be operated around an axis offset at an angle with respect to the longitudinal axis;

a first surface projecting a first distance from the longitudinal axis in a projecting direction,

a suction button projecting in the projecting direction and extending from the first surface;

a second surface on a proximal end side of the first surface, the second surface projecting a second distance from the longitudinal axis in the projecting direction, the second distance being greater than the first distance; and

a switch provided on the second surface; and

the operation body comprises:

a suction channel inside the operation body;

a concavity cut out from one or more of the first surface and the second surface; and

a suction tube connecting member disposed in the concavity, the suction tube connecting member being configured to be in fluid communication with the suction channel.

2. The endoscope operation section according to claim 1 , wherein the switch compresses a plurality of switches each provided on the second surface.

3. The endoscope operation section according to claim 2 , wherein the plurality of switches are disposed side by side at a predetermined interval in a direction perpendicular to a longitudinal axis direction.

4. The endoscope operation section according to claim 2 , wherein the plurality of switches are disposed side by side at a predetermined interval in a longitudinal axis direction.

5. An endoscope comprising the endoscope operation section according to claim 1 ; and

an elongated insertion portion comprising a suction channel.

6. The endoscope operation section according to claim 1 , wherein the switch projects from the second surface in the projecting direction.

7. The endoscope operation section according to claim 1 , further comprising a universal cord extending radially from the operation body, the universal cord being offset circumferentially from the concavity.

8. The endoscope operation section according to claim 1 , wherein an end surface of the suction button projects a third distance in the projecting direction, the third distance being greater than the second distance.

9. The endoscope operation section according to claim 1 , wherein the bending operation lever is provided at a third surface opposite to each of the first surface and the second surface relative to the longitudinal axis.

10. The endoscope operation section according to claim 1 , further comprising an insertion section connected to a distal end of the operation body, the insertion section being configured to bend and to be inserted into a subject.

11. The endoscope operation section according to claim 1 , wherein the projecting direction is offset at an angle with respect to the longitudinal axis.

12. The endoscope operation section according to claim 1 , wherein the bending operation lever is provided in a proximal end portion of the operation body, and the axis of the bending operation lever crosses the longitudinal axis at an acute angle during nonoperation, and is configured to swing around a predetermined fulcrum.

13. The endoscope operation section according to claim 1 , wherein

the first surface is provided on a first pedestal section formed on a distal end side of the operation section body relative to the bending operation lever; and

the second surface is provided on a second pedestal section formed on a proximal end side of the operation section body relative to the first surface.

14. An endoscope operation section comprising:

an operation body connected to a proximal end side of an elongated insertion section configured to be inserted into a subject, the insertion section comprising a suction channel inside and the insertion section having a first longitudinal axis, the operation body having a second longitudinal axis extending in a substantially same direction as the first longitudinal axis, the operation body being configured to be grasped by an operator;

a bending operation lever provided in a proximal end portion of the operation body, including an axis crossing the second longitudinal axis at an acute angle during nonoperation, and configured to swing around a predetermined fulcrum to bend the insertion section;

a first pedestal section formed in a first position on a distal end side relative to the bending operation lever in the operation body, a suction button extending from a first surface of the first pedestal section, the first surface projecting a first distance from the second longitudinal axis in a projecting direction of the suction button;

a suction tube connecting member configured to connect to one end of a suction tube, the suction tube connecting member extending from the suction button;

a second pedestal section formed in a second position on the proximal end side of the first pedestal section in the operation body, the second pedestal being fixed relative to the first pedestal section, the second pedestal having a second surface projecting a second distance from the second longitudinal axis in the projecting direction of the suction button, the second distance being greater than the first distance; and

a switch provided on the second surface, the switch being configured to be operated by pressing; and

the operation body comprises:

a suction channel inside the operation body;

a concavity cut out from one or more of the first surface and the second surface; and

the suction tube connecting member being disposed in the concavity, the suction tube connecting member being configured to be in fluid communication with the suction channel.

15. The endoscope operation section according to claim 14 , wherein the operation body comprises a concavity cut out from each of the first surface and the second surface.

16. The endoscope operation section according to claim 15 , further comprising a universal cord extending radially from the operation body, the universal cord being offset circumferentially from the concavity.

17. The endoscope operation section according to claim 14 , wherein an end surface of the suction button projects a third distance in the projecting direction, the third distance being greater than the second distance.

18. An endoscope operation section comprising:

an operation body having a longitudinal axis, the operation body comprising:

a bending operation lever provided at the operation body, the bending operation lever configured to be operated around an axis offset at an angle with respect to the longitudinal axis;

a first surface projecting a first distance from the longitudinal axis in a projecting direction,

a suction button projecting in the projecting direction and extending from the first surface;

a second surface on a proximal end side of the first surface, the second surface being fixed relative to the first surface, the second surface projecting a second distance from the longitudinal axis in the projecting direction, the second distance being greater than the first distance; and

a switch provided on the second surface;

wherein the operation body further comprising a concavity cut out from one or more of the first surface and the second surface; and

the operation body comprises:

a suction channel inside the operation body; and

a suction tube connecting member disposed in the concavity, the suction tube connecting member being configured to be in fluid communication with the suction channel,

wherein the first and second surfaces being coincident with first and second planes, respectively, and each of the first and second planes intersect the longitudinal axis.