Abstract: A tip end part (22) of an outer sheath (20) is rotatable about an axis in a predetermined range with respect to a tip end part (13) of a flexible insertion portion (11). A channel deformation space (19) which enables a part in the vicinity of the tip end of a channel tube (23) to be rotated with following the rotation while being elastically deformed is disposed. A locking mechanism (18, 28) is engaged or disengaged by rotating the tip end part (22) of the outer sheath (20) about the axis in the predetermined range with respect to the tip end part (13) of the flexible insertion portion (11).

Abstract: Combination of an endoscope and a sheath for covering an inserting tube of the endoscope, the sheath includes an elastic tubular member having an open proximal end and a closed distal end, and the endoscope is provided with an air feeding tube for feeding air from a distal end of the inserting tube to inflate the tubular member when the inserting tube is inserted into the tubular member to be covered therewith.

Abstract: A treatment instrument for an endoscope includes: a front end hood that is provided to a distal end of an inserting portion of the endoscope; a supporting member that is provided inside the front end hood; a treatment member that is rotatably supported by the supporting member; and an operating wire that is coupled to the treatment member and extended rearwardly from the front end hood. The treatment member is rotated about the supporting member by operating to extract and retract the operating wire at a base side of the endoscope.

Abstract: A snare for an endoscope includes a flexible sheath, a control wire movable within the flexible sheath, and a snare loop connected to an end of the control wire, wherein when the control wire is axially advanced, the snare loop projects from the flexible sheath and expands into a loop shape, whereas when the control wire is axially retracted, the snare loop retracts into the flexible sheath and is folded into a closed shape. A resilient wire which forms the snare loop includes a hook portion protruding in a lateral direction of the snare loop. The resilient wire includes a biasing portion which biases the distal end of the resilient wire from a tip end to a base end of the hook portion to press the distal end of the resilient wire against an inner surface of the flexible sheath when the resilient wire is retracted.

Abstract: A medical treatment instrument for an endoscope includes: an insulated sheath; a treatment member that is provided at a distal end of the sheath; and a wire loop that surround the treatment member and is capable of expansion and contraction by an operation at a proximal side of the sheath.

Abstract: A high-frequency treatment tool for an endoscope is provided with a transparent hood to be detachably coupled to a distal end of an endoscope provided with at least one electrode, at least one high-frequency electrode provided at a tip end of the transparent hood, at least one contact which is to electrically contact the at least one electrode of the endoscope, and at least one conductive member that electrically connects the at least one high-frequency electrode and the at lease one contact. The at least one conductive member is arranged to be located at an inner position with respect to an outer surface of the transparent hood.

Abstract: An endoscope for high-frequency treatment includes a flexible inserting section and an operation unit connected thereto. At least one terminal is provided to the operation unit and is connected to a high-frequency power supply. The endoscope further includes a hood having at least one treatment electrode for the high-frequency treatment and at least one contact, which are connected with at least one conductive line. The endoscope further includes a tip unit provided to a tip end of the inserting section. The tip unit has a hood receiving portion to which the hood is detachably coupled and one power supply electrode which contacts the at least one contact of the hood when the hood is coupled to the tip unit. The at least one power supply electrode is connected with the at least one terminal provided to the operation unit through a conductive wire which is inserted in the inserting section.

Abstract: An insertion unit for an endoscope includes a flexible tube having an inner diameter D1 and an inner cross-sectional area S, and a plurality of components inserted and arranged in said flexible tube. The plurality of components include at least one optical fiber bundle. The insertion unit is configured such that the inner diameter D1 is not less than 6.5 mm and the inner cross-sectional area S satisfies the condition of 0.5??s/s?0.6, where ?s represents a sum of cross-sectional areas of the components arranged in the flexible tube. Alternatively, the insertion unit is configured such that the inner diameter D1 is less than 6.5 mm and the inner cross-sectional area S satisfies the condition of 0.5??s/s?0.65.

Abstract: An endoscopic high-frequency knife includes immediately hood which is mounted to a distal end member fixed at a distal end of an endoscope to surround an end surface of the distal end member, an objective window being positioned on the end surface of the distal end member; a transparent hood portion which is formed on the hood to project forward from a portion of the hood in a vicinity of the end surface while being gradually curved inwards so as to cover the front of the end surface in a direction away from the end surface; and a high-frequency cutting electrode attached to the hood in a vicinity of a tip of the transparent hood portion, the high-frequency cutting electrode projecting forward from the transparent hood portion.

Abstract: A channel tube coupling structure for an anti-pollution type endoscope which can easily and smoothly couple a multi-lumen type channel tube extending from a base end of an outer sheath with tubes on a side of the endoscope and separate the multi-lumen type channel tube therefrom. At a side surface in a vicinity of the base end of the channel tube, side holes communicate with a plurality of tubes that are formed so as to be shifted from one another in an axial direction. A coupling hole, where the base end portion of the channel tube is loosely inserted thereinto and freely removed therefrom, provides a space in a radial direction between the channel tube and the coupling hole. Annular sealing members are provided which seal portions between the respective side holes, in a state where the base end portion of the channel tube is inserted into the coupling hole.

Abstract: A tubular treatment tool is provided for an endoscope. The tubular treatment tool includes a flexible tubular member. A groove is formed on the flexible tubular member and traverses the flexible tubular member along the diameter. An operation wire is provided in the flexible tubular member. The operation wire is movable relative to the flexible tubular member along an axis of the flexible tubular member. A distal end of the operation wire is secured to the flexible tubular member at a position on a distal end side with respect to the groove. A tissue collecting device is secured at the distal end of the flexible tubular member.

Abstract: In an outer sheathed endoscope, an outer sheath (20) for shielding a flexible insertion portion (11, 12, 13) from the outside is disposed to detachably cover the flexible insertion portion (11, 12, 13). The basal end of the flexible insertion portion is connected to an operation portion (15). In the outer sheathed endoscope, A break prevention member (100) which is formed by an elastic material is disposed to surround a basal end part of the flexible insertion portion (11, 12, 13), and the outer sheath (20) is formed to cover continuously the flexible insertion portion (11, 12, 13) and the break prevention member (100).

Abstract: A cover for preventing contamination of an operating portion covered on an operating portion of an endoscope a lower end of which is connected with an inserting portion. The cover is formed in a bag-like shape for enveloping a total of the operating portion, formed with a hole for passing the inserting portion at a lower end portion thereof and formed with a sleeve-like portion for inserting the hand to directly hold the operating portion at a rear face thereof.

Abstract: An endoscope includes a flexible inserting tube to be inserted into a body cavity, an operation unit connected to a proximal end of the flexible inserting tube for operating the flexible inserting tube, and an hollow cylindrical cover member connected to the operation unit to surround a portion of the flexible inserting tube near the proximal end thereof. A proximal end portion of the cover member is made of a first material while a distal end portion thereof is made of a second material. The first material has higher stiffness than the second material.

Abstract: A tubular treatment tool for an endoscope includes a flexible tubular member. A groove traversing the flexible tubular member in a direction of a diameter thereof is formed on the flexible tubular member. An operation wire is inserted in the flexible tubular member. The operation wire is movable relative to the flexible tube along an axis of the flexible tube. The distal end of the operation wire is secured to the flexible tube at a position on a distal end side with respect to the groove.

Abstract: A probe of an endoscope comprises a light guide fiber bundle and an image guide fiber bundle. The light guide fiber bundle supplies illumination light to the distal end of the probe, to illuminate the observed object. The illumination light is reflected by the observed object, and enters the end surface of the image guide fiber bundle. A ratio of an illumination sectional area of the light guide fiber bundle to a light receiving sectional area of the image guide fiber bundle is made equal.

Abstract: There is provided a bipolar forceps for endoscopes that includes a clevis, two shafts, and two end effectors. The clevis has two arms that form a slot between them. The shafts are sustained between the two arms spaced apart from each other. Each of the end effectors is pivotably attached to a different one of the two shafts, respectively, such that the end effectors are able to move in a scissor-like action. The end effectors being made of conductive material. Thus the end effectors can be utilized as electrodes for applying a high frequency voltage between them.

Abstract: A tip end part (22) of an outer sheath (20) is rotatable about an axis in a predetermined range with respect to a tip end part (13) of a flexible insertion portion (11). A channel deformation space (19) which enables a part in the vicinity of the tip end of a channel tube (23) to be rotated with following the rotation while being elastically deformed is disposed. A locking mechanism (18, 28) is engaged or disengaged by rotating the tip end part (22) of the outer sheath (20) about the axis in the predetermined range with respect to the tip end part (13) of the flexible insertion portion (11).

Abstract: In an endoscopic treatment instrument, a flexible tube has an area (A) which is to be located within an curved area (13) of an endoscope and which has a flattened cross-sectional shape.

Abstract: A cover tube, which is formed to be opened only at its upper surface and closed at its remaining portions, is disposed so as to be attachable and detachable beneath a hanger for suspending and holding an endoscope or an endoscope treatment member and so as to surround the tip end portion of the endoscope or the endoscope treatment member in a state of being suspended from and held by the hanger.