Abstract: An endoscope includes: a distal end cover provided on a distal end of an insertion portion; a holding member fitted with the distal end cover and holding built-in components; a cylindrical member inserted into the distal end cover and the holding member, the cylindrical member having a groove portion formed on an outer circumference; an elastically deformable elastic member engageably inserted into the groove portion and fixing the cylindrical member to the distal end cover and the holding member; first accommodating portions formed at least on a surface of the holding member and accommodating the elastic member; and second accommodating portions communicating to the first accommodating portions and accommodating the elastic member which, at time of inserting and detaching the cylindrical member, comes out from the groove of the cylindrical member, comes into contact with the outer circumferential portion of the cylindrical member and bends by elastic deformation.

Abstract: An endoscope includes a cylindrical member, a first outward flange including a first cutout, a projection projecting inward from an internal circumferential surface of a hole formed in a distal end portion of an insertion section of the endoscope, and capable of being engaged with the first cutout, an elastic member to urge the cylindrical member toward a bottom portion of the hole, and a projecting portion formed to project from the internal circumferential surface of the hole and including a surface facing the bottom portion of the hole.

Abstract: An endoscope includes: a contact surface formed on a part of an outer circumference of a functional member; a distal end member provided on a distal end portion of the insertion portion and including a first hole portion provided with a first hole axis, in which the functional member is arranged, and a second hole portion provided with a second hole axis being orthogonal to the first hole axis and communicating with the first hole portion; and a fixing member configured to fix the functional member to the distal end member by being inserted into the second hole portion in a state that a contactless portion not being in contact with the contact surface is caused to face the contact surface, and being rotated around an axis by a predetermined angle.

Abstract: A distal-end rigid section of an insertion section of an endoscope, includes: a first base of a metallic material, which constitutes a distal-end portion of the insertion section of the endoscope; a second base of a resin material, which is formed on an axially proximal-end side of the first base; a cylindrical portion protruding from the second base toward an axially distal-end side of the first base and including a non-circular hole portion in which an illumination light source having a non-circular outer shape, generating light and emitting illumination light is disposed; and a through-hole formed by opening a part along an outer peripheral surface of the first base, the cylindrical portion being disposed in the through-hole such that the illumination light is emitted to the axially distal-end side of the first base.

Abstract: An endoscope includes: a distal end cover provided on a distal end of an insertion portion; a holding member fitted with the distal end cover and holding built-in components; a cylindrical member inserted into the distal end cover and the holding member, the cylindrical member having a groove portion formed on an outer circumference; an elastically deformable elastic member engageably inserted into the groove portion and fixing the cylindrical member to the distal end cover and the holding member; first accommodating portions formed at least on a surface of the holding member and accommodating the elastic member; and second accommodating portions communicating to the first accommodating portions and accommodating the elastic member which, at time of inserting and detaching the cylindrical member, comes out from the groove of the cylindrical member, comes into contact with the outer circumferential portion of the cylindrical member and bends by elastic deformation.

Abstract: An endoscope includes a cylindrical member, a first outward flange including a first cutout, a projection projecting inward from an internal circumferential surface of a hole formed in a distal end portion of an insertion section of the endoscope, and capable of being engaged with the first cutout, an elastic member to urge the cylindrical member toward a bottom portion of the hole, and a projecting portion formed to project from the internal circumferential surface of the hole and including a surface facing the bottom portion of the hole.

Abstract: An endoscope includes: a contact surface formed on a part of an outer circumference of a functional member; a distal end member provided on a distal end portion of the insertion portion and including a first hole portion provided with a first hole axis, in which the functional member is arranged, and a second hole portion provided with a second hole axis being orthogonal to the first hole axis and communicating with the first hole portion; and a fixing member configured to fix the functional member to the distal end member by being inserted into the second hole portion in a state that a contactless portion not being in contact with the contact surface is caused to face the contact surface, and being rotated around an axis by a predetermined angle.

Abstract: An endoscope includes an insertion portion which includes a distal end hard portion having a hole portion passed through a distal end surface, and a nozzle including an opening. The nozzle includes a cover member including an annular portion, a cylindrical coupling portion coupled with the distal end hard portion and a cylindrical core member which has one end having the annular portion arranged thereon and the other end having the coupling portion arranged thereon and which includes a flow path communicating with the opening.

Abstract: Each of the first hinge portions includes a first central planar portion, and first both-sides planar portion, and each of second hinge portions includes a second central planar portion, and second both-sides planar portion which is arranged on the same plane as the first both-sides planar portion. At least one of each first hinge portion and each second hinge portion includes/include an axial step portion which is provided between the first central planar portion and the first both-sides planar portion and/or between the second central planar portion and the second both-sides planar portion over the entire length of the nodal ring in the longitudinal direction and allows/allow the first central planar portion to be arranged to an outer peripheral side than the second central planar portion by a distance corresponding to a wall thickness of the nodal ring.

Abstract: A distal-end rigid section of an insertion section of an endoscope, includes: a first base of a metallic material, which constitutes a distal-end portion of the insertion section of the endoscope; a second base of a resin material, which is formed on an axially proximal-end side of the first base; a cylindrical portion protruding from the second base toward an axially distal-end side of the first base and including a non-circular hole portion in which an illumination light source having a non-circular outer shape, generating light and emitting illumination light is disposed; and a through-hole formed by opening a part along an outer peripheral surface of the first base, the cylindrical portion being disposed in the through-hole such that the illumination light is emitted to the axially distal-end side of the first base.

Abstract: A method of manufacturing an endoscopic insertion portion with high manufacturing efficiency is provided. The endoscopic insertion portion includes a plurality of bending parts provided side by side with each other, a protruding portion provided in one of each two adjacent ones of the bending parts, and a receiving portion provided in the other of each two adjacent ones of the bending parts and into which the protruding portion is inserted rotatably. The method includes forming, in at least one plate material, a first bending part preparation portion for the formation of the one bending part and a second bending part preparation portion for the formation of the other bending part, connecting the first bending part preparation portion and the second bending part preparation portion by press processing, and forming the first and second bending part preparation portion into a cylindrical shape by press processing.

Abstract: Each of the first hinge portions includes a first central planar portion, and first both-sides planar portion, and each of second hinge portions includes a second central planar portion, and second both-sides planar portion which is arranged on the same plane as the first both-sides planar portion. At least one of each first hinge portion and each second hinge portion includes/include an axial step portion which is provided between the first central planar portion and the first both-sides planar portion and/or between the second central planar portion and the second both-sides planar portion over the entire length of the nodal ring in the longitudinal direction and allows/allow the first central planar portion to be arranged to an outer peripheral side than the second central planar portion by a distance corresponding to a wall thickness of the nodal ring.

Abstract: A method of manufacturing an endoscopic insertion portion with high manufacturing efficiency is provided. The endoscopic insertion portion includes a plurality of bending parts provided side by side with each other, a protruding portion provided in one of each two adjacent ones of the bending parts, and a receiving portion provided in the other of each two adjacent ones of the bending parts and into which the protruding portion is inserted rotatably. The method includes forming, in at least one plate material, a first bending part preparation portion for the formation of the one bending part and a second bending part preparation portion for the formation of the other bending part, connecting the first bending part preparation portion and the second bending part preparation portion by press processing, and forming the first and second bending part preparation portion into a cylindrical shape by press processing.

Abstract: An endoscope configured to be carried with a hand includes an insertion portion extending in a longitudinally axial direction, and an operation portion coaxially connected to a proximal end portion of the insertion portion and extending in the longitudinally axial direction, the operation portion includes an axially directional grasp portion extending in the longitudinally axial direction, a bending operation portion provided on a more proximal end side than the axially directional grasp portion, and a widely directional grasp portion provided on a more proximal end side than the bending operation portion wherein at least a part of the bending operation portion is located within a widely directional length of the widely directional grasp portion, and the widely directional grasp portion includes a grasp part protruding farther toward one widely directional side than the bending operation portion.

Abstract: A method of manufacturing an endoscopic insertion portion with high manufacturing efficiency is provided.