BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a clip treatment tool for an endoscope, which is used, for example, to close a wound and to stop bleeding in a living body.

2. Description of the Related Art

A clip treatment tool for an endoscope is used, for example, to close a wound and to stop bleeding by extruding arm portions of a clip from a distal end of the endoscope, which is inserted into a living body, and by ligating a treatment part, such as the wound and the bleeding part, with distal end parts of the arm portions of the clip.

Examples of such a clip treatment tool known to date include clip treatment tools that can freely open and close arm portions of a clip, as described in JP5750619B, JP4921173B, U.S. Pat. No. 9,339,270B, US2016/0367258A, and JP2008-289524A. By using the known technologies described in these patent documents, for example, it is possible to freely open and close arm portions of a clip in the body of a patient to hold a treatment part over again, and therefore it is possible to apply the clip to an accurate position on the treatment part and to perform treatment such as stoppage of bleeding.

SUMMARY OF THE INVENTION

However, once the treatment part has been ligated by the clip, the clip is placed in the body of the patient. Therefore, when the clip is placed in the body at a position displaced from a target position to be ligated due to an erroneous operation or the like, and when, for example, the clip placed in the body becomes unnecessary after bleeding or the like has been sufficiently stopped, the clip remains placed in the living body, and it is necessary to wait until the clip is naturally removed due to a change in body tissue of the patient. That is, there is a problem in that it is not possible to remove the clip at a desirable timing.

An object of the present invention is to provide a clip treatment tool with which, after the clip has been once applied, it is possible to reliably maintain the applied state, and it is possible to remove a clip placed in a living body at any desirable timing.

In order to achieve the object, the present invention provides a clip treatment tool including: a clip body that has two clip pieces, each of the two clip pieces having a body portion and an arm portion, the arm portions of the two clip pieces facing each other and respectively extending from the body portions toward a distal end side, each of the body portions of the two clip pieces having a fixing hole formed on a proximal end side and a movement hole formed on the distal end side relative to the fixing hole, the movement hole extending so as to be inclined from a side part in a width direction of the body portion on the proximal end side toward a middle in the width direction of the body portion on the distal end side; a container tube that contains the body portions of the two clip pieces therein; a stopper that extends through the fixing holes of the two clip pieces and that is attached to the clip body; and a fixing pin that extends through the movement holes of the two clip pieces and whose both end portions are fixed to positions in the container tube that face each other. The arm portions of the two clip pieces open in accordance with movement of the clip body from the proximal end side toward the distal end side, and the arm portions of the two clip pieces close in accordance with movement of the clip body from the distal end side toward the proximal end side.

Preferably, the movement hole of each of the two clip pieces has a proximal-end-side region and a distal-end-side region, the proximal-end-side region extending so as to be inclined from the side part in the width direction of the body portion on the proximal end side toward the middle in the width direction of the body portion on the distal end side, the distal-end-side region being located at the middle in the width direction of the body portion on the distal end side and extending from the proximal-end-side region toward the distal end side; and the body portions of the two clip pieces move in such a way that a position of the fixing pin moves along the proximal-end-side regions of the movement holes of the two clip pieces relatively from the distal end side toward the proximal end side, and the arm portions of the two clip pieces open; and the body portions of the two clip pieces move in such a way that the position of the fixing pin moves along the proximal-end-side regions of the movement holes of the two clip pieces relatively from the proximal end side toward the distal end side, and the arm portions of the two clip pieces close.

Preferably, the position of the fixing pin relatively moves from the proximal-end-side regions to the distal-end-side regions of the movement holes of the two clip pieces, and the arm portions of the two clip pieces enter a closed state.

Preferably, an opening is formed in the container tube; and, in accordance with movement of the clip body from the distal end side toward the proximal end side, the stopper moves to a position of the opening and is fitted into the opening, and the clip body is locked to the container tube.

Preferably, the position of the fixing pin relatively moves to most distal end parts of the distal-end-side regions of the movement holes of the two clip pieces, and the clip body is locked to the container tube while the arm portions of the two clip pieces are in the closed state.

Preferably, the clip treatment tool includes a coupling member that has a latch portion on the distal end side, the latch portion being removably latched to proximal end sides of the body portions of the two clip pieces of the clip body and a distal end part of an operation wire being fixed to a proximal end side of the coupling member, the coupling member coupling the clip body and the operation wire to each other; each of the two clip pieces has a coupling hole that is formed in the body portion on the proximal end side of the fixing hole, that extends in the width direction of the body portion, and that is latched by the latch portion, and the coupling hole has a passage opening that is open toward the proximal end side; the arm portions of the two clip pieces gradually close from an open state, overlap between the passage openings of the coupling holes of the two clip pieces gradually increases, and an opening diameter of the passage openings increases; and, while the arm portions of the two clip pieces are in the closed state, the clip body is locked to the container tube, the opening diameter of the passage openings of the coupling holes of the two clip pieces becomes maximum, and, in accordance with movement of the coupling member from the distal end side toward the proximal end side, the latch portion is removed through the passage openings, the two clip pieces and the coupling member are unlatched from each other, and the clip body and the operation wire are separated from each other.

Preferably, the clip treatment tool includes a container tube holder that has a tubular shape and that has a holding portion on the distal end side; the holding portion has two or more holding members that are disposed so as to face each other, and the two or more holding members respectively have extending portions that extend so as to become closer to each other from the proximal end side toward the distal end side and claw portions that extend so as to become farther from each other from distal end parts of the extending portions toward the distal end side; a recessed portion is formed in an inner peripheral surface on the proximal end side of the container tube; the coupling member has a coupling member body between the latch portion and the operation wire, the coupling member body having an outside diameter larger than an inside diameter of the two or more holding members at a position between the extending portions and the claw portions, the coupling member body is inserted through a space between the two or more holding members, the extending portions of the two or more holding members are pushed and expanded by the coupling member body so as to become farther from each other, the claw portions the two or more holding members are latched to the recessed portion of the container tube, and the container tube is removably attached to a distal end part of the container tube holder; and, in accordance with movement of the coupling member from the distal end side toward the proximal end side, a distal end part of the coupling member body moves to a position on the proximal end side relative to the position between the extending portions and the claw portions of the two or more holding members, the extending portions move closer to each other due to an elastic force, the claw portions of the two or more holding members and the recessed portion of the container tube are disengaged from each other, and the container tube and the container tube holder are separated from each other.

Preferably, in a state in which the container tube and the container tube holder are separated from each other, outer surfaces of the stopper are pressed, the stopper and the opening are released from each other, the clip body and the container tube are unlocked, and, in accordance with movement of the clip body from the proximal end side toward the distal end side, the arm portions of the two clip pieces gradually open from the closed state and enter the open state.

With the present invention, until a treatment part is ligated by a clip unit, which is composed of the clip body, the container tube, the stopper, and the fixing pin, it is possible to hold the treatment part over again by using the two clip pieces; and, after the treatment part has been ligated by the clip unit, because the clip body and the container tube are locked, it is possible to reliably maintain the state in which the treatment part is ligated by the clip unit. Moreover, after the clip unit is placed at the treatment part, it is possible to remove the clip unit from the treatment part by unlocking the clip body and the container tube at any desirable timing.

