Abstract: A hood for endoscope is attached to an endoscope including an insertion portion, a distal end portion and an air-feeding conduit, and the hood for endoscope includes a frame configured to be fitted to an outer circumference of the distal end portion, and a rectification plate configured to, so that gas spurted out forward in a longitudinal axis direction from an air-feeding port flows, changing an orientation in which the gas flows, from the longitudinal axis direction to a circumferential direction of the frame intersecting the longitudinal axis direction by the gas hitting the rectification member, guide the gas in a direction not toward a position of the distal end portion provided with an observation member.

Abstract: An insertion apparatus includes an endoscope, a first air feeding apparatus, a first air suction apparatus, a second air feeding apparatus, a second air suction apparatus, a pressure detector, an operation detector and a controller, and the controller performs first control on the second air feeding apparatus and the second air suction apparatus so that the amount of gas per predetermined time period fed from the second air feeding apparatus becomes equal to the amount of gas suctioned by the second air suction apparatus, and when the operation detector detects the operation and the pressure detector detects that the pressure in a subject changes from a first pressure to a second pressure, the controller maintains the first control to perform air feeding/air suction into/from the subject at the second pressure.

Abstract: The endoscope apparatus includes an endoscope insertion portion configured to be inserted into a subject and including a distal end portion, a distal end covering portion configured to cover at least an outer periphery of the distal end portion of the endoscope insertion portion and held by the distal end portion, a suction conduit provided with an opening in the distal end covering portion and configured to discharge a fluid including gas generated from an inside of the subject to outside of the subject via the opening, and a positioning portion configured to define a position of the opening of the suction conduit in a rotation direction with a long axis of the endoscope insertion portion as a center when the distal end covering portion is held by the distal end portion of the endoscope insertion portion.

Abstract: An endoscope apparatus includes: an endoscope including an insertion portion, a suction conduit, a by-pass conduit, a suction button, and a solenoid valve; a high-frequency knife; and a valve opening/closing portion.

Abstract: A hood for endoscope is attached to an endoscope including an insertion portion, a distal end portion and an air-feeding conduit, and the hood for endoscope includes a frame configured to be fitted to an outer circumference of the distal end portion, and a rectification plate configured to, so that gas spurted out forward in a longitudinal axis direction from an air-feeding port flows, changing an orientation in which the gas flows, from the longitudinal axis direction to a circumferential direction of the frame intersecting the longitudinal axis direction by the gas hitting the rectification member, guide the gas in a direction not toward a position of the distal end portion provided with an observation member.

Abstract: An insertion apparatus includes an endoscope, a first air feeding apparatus, a first air suction apparatus, a second air feeding apparatus, a second air suction apparatus, a pressure detector, an operation detector and a controller, and the controller performs first control on the second air feeding apparatus and the second air suction apparatus so that the amount of gas per predetermined time period fed from the second air feeding apparatus becomes equal to the amount of gas suctioned by the second air suction apparatus, and when the operation detector detects the operation and the pressure detector detects that the pressure in a subject changes from a first pressure to a second pressure, the controller maintains the first control to perform air feeding/air suction into/from the subject at the second pressure.

Abstract: The disclosed technology is directed to an endoscope comprises an operation portion. An insertion portion having respective proximal and distal ends. The proximal end is configured to be attached to the operation portion and the distal end is used to be inserted into a subject. The distal end of the insertion portion includes a distal surface having at least an observation window, a channel opening, and an elongated feed conduit having a slanted feed passage all which formed therein to communicate simultaneously with the operation portion and a procedure instrument during an operation on the subject. The elongated feed conduit having the slanted feed passage used to direct fluid into the subject. The slanted passage feed includes an ejection port that ejects the fluid from the slanted feed passage at an angle to generate a vortex flow so that mucus or mist-form particles are diffused away from the observation window.

Abstract: An insertion portion mounted tool of an insertion instrument includes: an expansion and retraction section provided on an outer circumferential side of an insertion portion so as to be movable forward and backward in a longitudinal direction, and configured to be expanded in the subject by an operation from outside of the subject to thereby be held by an inner wall of the subject; a positioning portion that defines a range in which the expansion and retraction section is movable forward and backward in the longitudinal direction with respect to the insertion portion; and a rotational movement restriction portion that restricts an angle in which the expansion and retraction section is rotationally moved in an outer circumferential direction on an outer circumference of the insertion portion.

Abstract: A treatment instrument insertion tool includes a tubular treatment instrument guide portion, configured to guide a treatment instrument into an insertion portion of an insertion device via a treatment instrument insertion port, a guide portion body freely attachably/detachably provided in a region of the insertion portion located outside a subject when the insertion portion is inserted into the subject, and a film member including a hole that allows insertion of the treatment instrument, water-tightly engaging with the treatment instrument when the treatment instrument is inserted into the hole, and being formed of a material freely expandable/contractible and restricting permeation of a liquid.

Abstract: The endoscope apparatus includes an endoscope insertion portion configured to be inserted into a subject and including a distal end portion, a distal end covering portion configured to cover at least an outer periphery of the distal end portion of the endoscope insertion portion and held by the distal end portion, a suction conduit provided with an opening in the distal end covering portion and configured to discharge a fluid including gas generated from an inside of the subject to outside of the subject via the opening, and a positioning portion configured to define a position of the opening of the suction conduit in a rotation direction with a long axis of the endoscope insertion portion as a center when the distal end covering portion is held by the distal end portion of the endoscope insertion portion.

Abstract: An endoscope apparatus includes: an endoscope including an insertion portion, a suction conduit, a by-pass conduit, a suction button, and a solenoid valve; a high-frequency knife; and a valve opening/closing portion.

Abstract: An endoscope system includes an endoscope including an insertion section, an objective lens, a first pipe configured to cause foreign matters to flow through a suction opening provided on a distal end side of the insertion section, a valve configured to switch the first pipe to either one of an open state and a closed state, and a second pipe divided from a part of the first pipe not passing through the valve, a cautery apparatus configured to apply energy to a body tissue, a first suction apparatus configured to suck the foreign matters through the valve in a case where the first pipe is open, and a second suction apparatus configured to suck, through the second pipe, gas containing a solid particle component derived from the body tissue, when energy is applied to the body tissue by the cautery apparatus.

Abstract: An endoscopic treatment tool includes: a tubular insertion part; a stopper having a through hole and provided at a distal end part of the insertion part; a manipulation wire inserted through the insertion part; a treatment part provided at a distal end part of the manipulation wire and inserted through the through hole; and a restriction member provided closer to a proximal end side than the stopper and connecting the treatment part and the manipulation wire. When the restriction member is pressed against the stopper, the treatment part is locked not to be rotated about an axis of the insertion part with respect to the insertion part, and an opening causing a fluid to flow from an inside of the insertion part to the through hole is formed on an outer peripheral surface of the restriction member.

Abstract: An insertion portion mounted tool of an insertion instrument includes: an expansion and retraction section provided on an outer circumferential side of an insertion portion so as to be movable forward and backward in a longitudinal direction, and configured to be expanded in the subject by an operation from outside of the subject to thereby be held by an inner wall of the subject; a positioning portion that defines a range in which the expansion and retraction section is movable forward and backward in the longitudinal direction with respect to the insertion portion; and a rotational movement restriction portion that restricts an angle in which the expansion and retraction section is rotationally moved in an outer circumferential direction on an outer circumference of the insertion portion.

Abstract: A high-frequency treatment tool for an endoscope includes: a sheath formed of a material having an insulation property; a shaft-shaped member formed of a material having conductivity and inserted to advance and retract in the sheath; and an electrode having a conduit line formed to jet forward a fluid supplied into the sheath, and connected to a distal end section of the shaft-shaped member. The electrode has an outer circumferential surface electrically connected to a contacted tissue to perform treatment, and an inner circumferential surface of the conduit line that faces the fluid when the fluid is supplied. An arithmetic average roughness of the outer circumferential surface is larger than an arithmetic average roughness of the inner circumferential surface, and the arithmetic average roughness of the inner circumferential surface is 0.1 ?m or less.

Abstract: Provided is a high-frequency treatment tool including a cylindrical sheath, an electrode member that is made to protrude and be retracted with respect to a distal-end portion of the sheath, and a liquid-feeding unit for feeding a liquid toward the distal-end side inside a flow channel in the sheath, wherein a distal end of the electrode member is provided with a distal-end expanded portion that extends radially outward in a radiating manner and that has a base-end surface that is made to protrude and be retracted with respect to a distal-end portion of the sheath, wherein the sheath is provided with a restricting portion that restricts the movement of the electrode member toward the base-end side at a position at which a portion of the distal-end expanded portion is accommodated inside the sheath and an accommodating portion that can accommodate at least a portion of the distal-end expanded portion.

Abstract: Provided is a high-frequency treatment tool including a cylindrical sheath, an electrode member that is made to protrude and be retracted with respect to a distal-end portion of the sheath, and a liquid-feeding unit for feeding a liquid toward the distal-end side inside a flow channel in the sheath, wherein a distal end of the electrode member is provided with a distal-end expanded portion that extends radially outward in a radiating manner and that has a base-end surface that is made to protrude and be retracted with respect to a distal-end portion of the sheath, wherein the sheath is provided with a restricting portion that restricts the movement of the electrode member toward the base-end side at a position at which a portion of the distal-end expanded portion is accommodated inside the sheath and an accommodating portion that can accommodate at least a portion of the distal-end expanded portion.

Abstract: A high-frequency treatment tool for an endoscope includes: a sheath formed of a material having an insulation property; a shaft-shaped member formed of a material having conductivity and inserted to advance and retract in the sheath; and an electrode having a conduit line formed to jet forward a fluid supplied into the sheath, and connected to a distal end section of the shaft-shaped member. The electrode has an outer circumferential surface electrically connected to a contacted tissue to perform treatment, and an inner circumferential surface of the conduit line that faces the fluid when the fluid is supplied. An arithmetic average roughness of the outer circumferential surface is larger than an arithmetic average roughness of the inner circumferential surface, and the arithmetic average roughness of the inner circumferential surface is 0.1 ?m or less.

Abstract: In a high-frequency knife, a through hole that extends in the direction of an axis is formed on a radial outer side of a second electrode in a larger-diameter portion, and a distance increasing portion increases a creeping distance along an external surface of the larger-diameter portion between an outer peripheral surface of the second electrode exposed to the outside and an opening of the through hole on a proximal end side.

Abstract: In a high-frequency knife, a through hole that extends in the direction of an axis is formed on a radial outer side of a second electrode in a larger-diameter portion, and a distance increasing portion increases a creeping distance along an external surface of the larger-diameter portion between an outer peripheral surface of the second electrode exposed to the outside and an opening of the through hole on a proximal end side.