JP2003299670A - Beak-shaped treatment tool for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety beak-shaped treatment tool for an endoscope capable of being passed through even a bent part of a treatment tool insertion channel of an endoscope without damaging the treatment tool insertion channel. <P>SOLUTION: In this beak-shaped treatment tool for the endoscope wherein a pair of beak-shaped treatment pieces 4 mounted on a tip of a sheath 1 can be opened and closed like a beak by operating an operating wire 8 inserted in the sheath 1 at hand side to be axial advanced and retracted, a swing restriction stopper 6s is mounted for restricting the movement of the beak-shaped treatment pieces 4 from a closing condition where the beak-shaped treatment pieces 4 are directed straightforward to the direction opposite to the opening direction. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beak-like treatment instrument for an endoscope which has a beak-like treatment piece which opens and closes in a beak-like manner at its tip.

[0002]

2. Description of the Related Art As a beak-like treatment instrument for an endoscope, there are biopsy forceps, grasping forceps, hemostatic forceps, scissors forceps and many others.

FIG. 9 shows a distal end portion of a biopsy forceps for an endoscope, which is flexible by operating an operating wire 92 inserted through a flexible sheath 91 from the proximal side in an axial direction. A pair of beak-shaped treatment pieces 93 arranged at the distal end of the sex sheath 91 are configured to open and close like a beak around the support shaft 94.

In such a beak-like treatment instrument for an endoscope, it is difficult to directly open and close the beak-like portion of the beak-like treatment piece 93. A drive arm portion 93a extending rearward is integrally formed, and by driving the drive arm portion 93a, the beak-shaped treatment piece 93 opens and closes in a beak-like shape around the support shaft 94. .

[0005]

As shown in FIG. 10, when the treatment instrument is passed through the treatment instrument insertion channel 50 of the endoscope, at the place where the treatment instrument insertion channel 50 is bent, a beak-like treatment is performed. The piece 93 is bent along the bend of the treatment instrument insertion channel 50 so as to swing around the support shaft 94.

As a result, the drive arm portion 93a integrally connected to the beak-like treatment piece 93 is rotated behind the support shaft 94, and the tip end portion of the drive arm portion 93a is pushed out to the side. May be strongly rubbed against the inner wall surface of the treatment instrument insertion channel 50 to damage the treatment instrument insertion channel 50.

Therefore, the present invention provides a safe beak-like treatment instrument for an endoscope which does not damage the treatment instrument insertion channel even when the treatment instrument insertion channel of the endoscope is passed through a bent portion. To aim.

[0008]

In order to achieve the above object, a beak-like treatment instrument for an endoscope according to the present invention has a pair of beak-like treatment pieces arranged at a distal end of a sheath and inserted and inserted into the sheath. In a beak-like treatment instrument for an endoscope configured to open and close in a beak shape by advancing and retracting the operation wire in the axial direction from the proximal side, in a closed state in which the beak-like treatment piece is directed straight forward A swinging restriction stopper for restricting movement in the direction opposite to the opening direction is provided.

Incidentally, behind the pair of beak-shaped treatment pieces,
The driving arm portion located inside the support body attached to the distal end of the sheath is integrally formed, and the swinging restriction stopper is such that one beak-shaped treatment piece has a protruding end of the driving arm portion of the other beak-shaped treatment piece. It suffices that the movement of one beak-shaped treatment piece is restricted so as not to push the part out of the support body.

Further, two support shafts for individually rotatably supporting the pair of beak-shaped treatment pieces are provided in parallel with each other with a space between them, and one spacer held by the two support shafts is provided. If it is arranged between the pair of beak-shaped treatment pieces and the swinging restriction stopper is formed on the spacer, sufficient strength can be obtained without cost.

The spacer is formed in a shape in which the left and right side surfaces are dented into substantially half portions at positions where the left and right side surfaces are offset from each other. A swinging restriction stopper may be formed on the non-dented portion.

The operation wire is two conductive wires that are electrically insulated from each other, and the spacer is formed by an insulating member that electrically insulates between the pair of beak-shaped treatment pieces. The pair of beak-shaped treatment pieces may be a positive electrode and a negative electrode of the high-frequency treatment instrument by connecting the conductive wire of (1) to a high-frequency power source.

[0013]

Embodiments of the present invention will be described with reference to the drawings. 2 is a side sectional view of a distal end portion of an endoscope bipolar high-frequency treatment instrument to which the present invention is applied, and FIG. 3 is a plan sectional view. However, in each drawing, a plurality of portions having different sectional positions are shown in one drawing.

Reference numeral 1 denotes a flexible sheath having a diameter of about 2 to 3 mm and a length of about 1 to 2 m which is inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown), and is, for example, tetrafluoride. It is formed of an electrically insulating tube such as an ethylene resin tube.

A support body 2 made of electrically insulating material such as hard plastic or ceramic is connected and fixed to the tip of the flexible sheath 1. The support body 2 is provided with a slit 3 which opens to the front side. It is formed with a constant width.

At the tip of the slit 3, two spindles 5 made of stainless steel rods are fixed in parallel so as to traverse the slit 3 at positions apart from each other on both sides of the central axis of the support body 2. Has been done.

A pair of beak-shaped electrodes 4 (beak-shaped treatment pieces) made of a conductive metal such as stainless steel are attached to the support body 2 independently of each other by two support shafts 5 which can be opened and closed in a beak-like shape. It is supported. Reference numeral 9 is a rotation support hole formed in the beak-shaped electrode 4 so that the support shaft 5 is rotatably fitted therein.
In addition, in FIG. 2, the state in which the beak-shaped electrode 4 is closed is shown by a solid line, and the state in which it is opened is shown by a two-dot chain line.

An insulating spacer 6 for electrically insulating a pair of beak-shaped electrodes 4 is located between the beak-shaped electrodes 4 in the tip portion of the slit 3 formed in the support body 2. Are arranged as follows.

The rear portion of each beak-shaped electrode 4 has a rotation support hole 9
The drive arm portion 4a is integrally formed so as to extend rearward,
In the connecting hole 7 formed near the tip of the drive arm portion 4a,
The ends of the two conductive wires 8 are passed through and connected.

Each conductive wire 8 is provided with an electrically insulating coating over the entire length, and the conductive wire 8a exposed only at the tip portion is engaged with the connecting hole 7 in a state of being in contact with the beak-shaped electrode 4, respectively.

The two conductive wires 8 are arranged in the flexible sheath 1 so as to be able to move back and forth in the axial direction over the entire length thereof, and are connected to the proximal end of the flexible sheath 1 as shown in FIG. In the operated operation unit 10, the operation wheel 11 is operated to move back and forth in the axial direction.

Therefore, the conductive wire 8 also functions as an operation wire for opening and closing the beak-shaped electrode 4 by remote control, and in the flexible sheath 1, the two conductive wires 8 are provided.
It is advisable to bundle them together.

The base ends of the two conductive wires 8 are separately connected to the positive and negative power cords of the high frequency power source 20 in the operating section 10. By turning on the high frequency power source 20, a pair of beaks are set. One of the electrodes 4 serves as a positive electrode for high frequency current, and the other serves as a negative electrode.

The insulating spacer 6 shown in FIGS. 4 and 5 in a state in which the single body is turned around is formed of one component made of, for example, hard tetrafluoroethylene resin or other plastic material or ceramic. A support hole 6a through which the two support shafts 5 are inserted is formed in parallel therethrough in the left-right direction, and electrode-passing portions 6b are formed on the left and right side surfaces by recessing the mutually different positions by approximately half. Has been done.

Then, as shown in FIG. 6 which is a sectional view taken along line VI-VI in FIG. 2, each support hole 6 of the insulating spacer 6 is shown.
A support shaft 5 is passed through a, whereby the insulating spacer 6 is stably held in the slit 3 of the support body 2. FIG. 7 is a perspective sectional view of that portion.

The peripheral portions of the rotation support holes 9 of the drive arm portions 4a of the pair of beak-shaped electrodes 4 are fitted into the electrode passage portions 6b formed by recessing the left and right sides of the insulating spacer 6 so that they are not fixed. Each beak-shaped electrode 4 is rotatably supported around a support shaft 5 that is passed through a rotation support hole 9.

The bipolar high-frequency treatment instrument for an endoscope thus constructed has a blood vessel sandwiched between a pair of beak-shaped electrodes 4 and a high-frequency current is passed between the pair of beak-shaped electrodes 4 to cause a space between the pair of beak-shaped electrodes 4. A high-frequency current flows only in the located tissue, and the tissue can be cauterized and coagulated to perform hemostasis or incision.

As shown in FIGS. 4 and 5, the insulating spacer 6 is formed with recessed electrode passage portions 6b on both left and right side surfaces. A wall portion rising from the bottom surface of the insulating spacer 6 with respect to the beak electrode 4 is formed. It is formed as a swing restriction stopper 6s.

As shown in FIG. 2, when the beak-shaped electrode 4 tries to move in a direction opposite to the opening direction from the closed state in which the beak-shaped electrode 4 is directed straight forward, the swing-restricting stopper 6s is provided with The abutment restricts the swinging of the beak-shaped electrode 4.

However, it is not necessary to prevent each beak-shaped electrode 4 from swinging from the straight closed state in the direction opposite to the opening direction at all. As shown in FIG. When the beak-shaped electrode 4 is pushed by the external force F, the projecting end portion 4 of the drive arm portion 4a 'of the other beak-shaped electrode 4'is
Any one may be used as long as it regulates the movement of one beak-shaped electrode 4 so that z ′ is not pushed out from the outer tangent line 100 of the support body 2.

By doing so, when the treatment instrument passes through the treatment instrument insertion channel (not shown) of the endoscope,
Since the projecting end portion 4z of the drive arm portion 4a does not touch the inner peripheral surface of the treatment instrument insertion channel, there is no fear of damaging the treatment instrument insertion channel even when the treatment instrument insertion channel is passed through the bent portion.

In this embodiment, since the swinging stopper 6s is formed integrally with the insulating spacer 6 held at the tip of the supporting body 2 by passing the two support shafts 5, the cost of parts is reduced. A stopper having sufficient strength can be obtained without incurring extra assembly cost.

The present invention is not limited to the above embodiment, and the present invention can be applied to various ordinary treatment tools that do not use high frequency waves.

[0034]

According to the present invention, by providing a swinging restriction stopper for restricting the movement of the beak-shaped treatment piece from the closed state in which it is facing straight forward and in the direction opposite to the opening direction, Even when the treatment instrument insertion channel of the endoscope is passed through the bent portion, there is no risk of damaging the treatment instrument insertion channel, and the endoscope can be used with peace of mind.

[Brief description of drawings]

FIG. 1 is an enlarged side view of a distal end portion of a bipolar high-frequency treatment instrument for an endoscope according to an embodiment of the present invention.

FIG. 2 is a side view composite cross-sectional view of the distal end portion of the bipolar high-frequency treatment instrument for endoscope according to the embodiment of the present invention.

FIG. 3 is a plane composite cross-sectional view of the distal end portion of the endoscope bipolar high-frequency treatment instrument of the embodiment of the present invention.

FIG. 4 is a perspective view of a single unit of an insulating spacer of a bipolar high-frequency treatment instrument for an endoscope according to an embodiment of the present invention.

FIG. 5 is a perspective view of a single unit of an insulating spacer of a bipolar high-frequency treatment instrument for an endoscope according to an embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 2 of the bipolar high-frequency treatment instrument for an endoscope according to the embodiment of the present invention.

FIG. 7 is a perspective view of the cross-sectional portion shown in FIG. 6 of the bipolar high-frequency treatment instrument for an endoscope according to the embodiment of the present invention.

FIG. 8 is an overall configuration diagram of a bipolar high-frequency treatment instrument for an endoscope according to an embodiment of the present invention.

FIG. 9 is a side view of a distal end portion of a conventional beak-shaped treatment instrument for an endoscope.

FIG. 10 is a side view of a distal end portion in a state where a conventional beak-shaped treatment instrument for an endoscope passes through a bent portion of a treatment instrument insertion channel of an endoscope.

[Explanation of symbols]

1 Flexible sheath 2 Support body 3 slits 4 Beak-shaped electrode (beak-shaped treatment piece) 4a Drive arm 4z tip 5 spindles 6 Insulation spacer 6s Pivoting control stopper 8 operation wire

Claims (5)

[Claims] 1. A pair of beak-shaped treatment pieces arranged at the distal end of a sheath are configured to open and close like a beak by advancing and retracting an operation wire inserted and arranged in the sheath from the proximal side in an axial direction. In the beak-shaped treatment instrument for endoscopes, a swinging restriction stopper for restricting the movement of the beak-shaped treatment piece from the closed state in which it is straight forward and in the direction opposite to the opening direction is provided. A beak-like treatment instrument for endoscopes which is characteristic. 2. A driving arm portion located inside a support body attached to the distal end of the sheath is integrally formed behind the pair of beak-shaped treatment pieces, and the swinging restriction stopper is The endoscope according to claim 1, wherein the movement of the one beak-shaped treatment piece is restricted so that the one beak-shaped treatment piece does not push out the protruding end portion of the drive arm of the other beak-shaped treatment piece from the support body. Beak-shaped treatment tool. 3. A pair of support shafts for individually rotatably supporting the pair of beak-shaped treatment pieces are provided in parallel with each other with a space between them, and one support shaft held by the two support shafts. The beak-shaped treatment instrument for an endoscope according to claim 1 or 2, wherein a spacer is arranged between the pair of beak-shaped treatment pieces, and the swinging restriction stopper is formed on the spacer. 4. The spacer is formed in a shape in which the left and right side surfaces are recessed at substantially half positions, and the drive arm portions of the pair of beak-like treatment pieces are divided into the recessed portions. The beak-shaped treatment instrument for an endoscope according to claim 3, wherein the swinging restriction stopper is formed on a portion which is arranged and is not recessed. 5. The operating wire is two conductive wires electrically insulated from each other, and the spacer is formed by an insulating member electrically insulating between the pair of beak-shaped treatment pieces. The beak for an endoscope according to claim 1, wherein the pair of beak-shaped treatment pieces serve as a positive electrode and a negative electrode of the high-frequency treatment instrument by connecting the two conductive wires to a high-frequency power source. Treatment tool.