JP2002153484A - High-frequency incision instrument for endoscope - Google Patents

Abstract

(57) [Summary] [Problem] Even if the relative positional relationship between an incision implement and human body tissue suddenly changes during an incision procedure, the rod-shaped electrode does not significantly displace with respect to the incision human body tissue. Provided is a high-frequency incision instrument for an endoscope that can perform an incision procedure safely. A high-frequency incision instrument for an endoscope configured to allow a high-frequency current to flow through a rod-like electrode 3 protruding forward from a distal end of an electrically insulating sheath 1, wherein the rod-like electrode 3 is formed by a conductive metal stranded wire. Formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency incision device for an endoscope which is used through a treatment tool insertion channel of an endoscope and in which a high-frequency current is applied to cut a human body tissue.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional high-frequency incision instrument for an endoscope. For example, a distal end of an electrically insulating flexible sheath 91 inserted into a treatment instrument insertion channel of the endoscope is moved forward. A rod-shaped electrode 92 made of a stainless steel bar or the like protrudes.

A high-frequency current can be arbitrarily applied to the rod-shaped electrode 92 by operating the flexible sheath 91 from the proximal end side.
An incision is made while the body tissue touching 2 is cauterized.

[0004]

During such an incision procedure, for example, the operator touches the bending operation knob of the endoscope to displace the distal end portion of the endoscope, or the patient removes a cough. When the body tissue side suddenly moves during the operation, the relative positional relationship between the incision implement and the body tissue changes.

Then, since the rod-shaped electrode 92 is close to a rigid body, the rod-shaped electrode 92 is largely displaced with respect to the incised human tissue as shown by a two-dot chain line in FIG. The incision may be made to the depth.

Therefore, according to the present invention, even if the relative positional relationship between the incision implement and the human body tissue suddenly changes during the incision procedure, the rod-shaped electrode is not largely displaced with respect to the incision human body tissue, and the safety is improved. It is an object of the present invention to provide a high-frequency incision instrument for an endoscope that can perform an incision procedure.

[0007]

To achieve the above object, a high-frequency incision instrument for an endoscope according to the present invention is capable of supplying a high-frequency current to a rod-like electrode protruding forward from a distal end of an electrically insulating sheath. In the configured high-frequency endoscope for endoscope, the rod-shaped electrode is formed by a conductive metal stranded wire.

[0008] The strands of the stranded wire are preferably fixed to each other at the distal end so that the twist of the distal end of the stranded wire forming the rod-shaped electrode is not frayed. The sheath is operated by operation from the proximal end side of the sheath. The length of protrusion of the rod-shaped electrode from the tip of the rod may be adjusted.

Further, the rod-shaped electrode may be formed in a single rod shape straight in the direction of extension of the axis of the distal end portion of the sheath, or the rod-shaped electrode may be formed in a L-shaped bent end. Good. Further, at least the surface portion of the tip of the rod-shaped electrode may be an electrically insulating material.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a high-frequency incision device for an endoscope according to a first embodiment of the present invention. Reference numeral 1 denotes an electric device made of, for example, a tube made of tetrafluoroethylene resin having a diameter of about 2 mm and a total length of about 2 m. The endoscope 5 is an insulating flexible sheath.
0 is used through the treatment tool insertion channel 51.

In the flexible sheath 1, a conductive flexible operation wire 2 is disposed so as to be able to advance and retreat in the axial direction over substantially the entire length thereof.
The rod-shaped electrode 3 is connected so as to protrude forward from the distal end of the flexible sheath 1.

An operating section 10 connected to the proximal end of the flexible sheath 1 is connected to an electrically insulating knob 11 to which the proximal end of the operating wire 2 is connected, and a high-frequency power cord (not shown). A connection terminal / wire fixing screw 12 to be used is arranged.

With such a configuration, if the connection terminal / wire fixing screw 12 is loosened, the operating wire 2 is advanced and retracted in the axial direction to adjust the protruding length of the rod-shaped electrode 3 from the distal end of the flexible sheath 1. Can be.

At the time of use, the operation wire 2 is fixed to the operation section 10 by tightening the connection terminal / wire fixing screw 12, and the protruding length of the rod-shaped electrode 3 from the distal end of the flexible sheath 1 is fixed. A high-frequency current can be arbitrarily applied to the rod-shaped electrode 3 via the operation wire 2.

FIG. 1 shows a distal end portion of a high-frequency incision instrument for an endoscope. At the distal end of the flexible sheath 1, a through hole 5a having a diameter slightly smaller than the inner diameter of the flexible sheath 1 is provided at an axial position. The formed electrically insulating tip stopper 5 is fixedly attached.

The operation wire 2 and the rod-shaped electrode 3 are connected in the flexible sheath 1 by a connection pipe 4 made of a metal pipe having a thickness that cannot pass through the through hole 5a of the distal end stopper 5.
Therefore, the rod-shaped electrode 3 does not protrude forward than the state shown in FIG. 1 in which the distal end of the connecting tube 4 contacts the inner surface of the distal end stopper 5.

The rod-shaped electrode 3 is formed by a stranded wire obtained by twisting a plurality of conductive stainless steel wires, for example, into a single rod shape straight in the direction of the extension of the axis of the distal end portion of the flexible sheath 1. Therefore, the operation wire 2 may be formed to extend forward as it is.

The diameter of the rod-shaped electrode 3 is, for example, 0.3 to 1 mm.
And a twisted wire obtained by twisting about 3 to 37 strands is used. Note that the outer diameter of the stranded wire is 0.5 to
Most preferred is about 0.9 mm and about 19 strands,
A stranded wire suitable for the situation may be used.

At the tip 3a of the rod-shaped electrode 3, the strands are welded to each other so that the twist cannot be unraveled.
The parts other than the both ends are in the state of the stranded wire of the material.

As a result, the rod-shaped electrode 3 has much more flexible elasticity and resilience as compared with the case where it is formed by a single stainless steel rod or the like, and as shown by a two-dot chain line in FIG. It is easily bent by an external force, and returns to its original straight state when the external force is removed.

When using the high-frequency incision device for an endoscope of the embodiment configured as described above, as shown in FIG. 3, the high-frequency current is applied by pressing the rod-shaped electrode 3 against the mucosal surface of the human body tissue. As a result, an incision is made while the body tissue is cauterized.

[0022] Even if the endoscope side or the human body side suddenly moves during such an incision procedure and the relative positional relationship between the incision tool and the human body tissue is suddenly changed, it is formed with a stranded wire. Since the rod-shaped electrode 3 is elastically deformed, the rod-shaped electrode 3 is not greatly displaced with respect to the human body tissue being cut as shown by a two-dot chain line in FIG. I can't.

It should be noted that the present invention is not limited to the above-described embodiment. For example, the rod-shaped electrode 3 may be fixed to the distal end of the flexible sheath 1. Further, as shown in FIG. 4, the tip of the rod-shaped electrode 3 is bent in an L-shape, or as shown in FIG. 5, an electrically-insulating tip 3b is attached to the tip of the rod-shaped electrode 3. The present invention can also be applied to a conventional electrode (or a rod-shaped electrode 3 having a distal end portion subjected to an electrical insulation coating treatment).

[0024]

According to the present invention, since the rod-shaped electrode is formed of a conductive metal stranded wire, the rod-shaped electrode has a soft elasticity and resilience. Even if the relative positional relationship between the rod-shaped electrodes suddenly fluctuates, the rod-shaped electrode does not significantly displace with respect to the human body tissue being dissected, and the dissection treatment can be performed safely.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a distal end portion of a high-frequency incision device for an endoscope according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of the entire configuration of the high-frequency incision instrument for an endoscope according to the first embodiment of the present invention.

FIG. 3 is a side sectional view of a distal end portion of the high-frequency incision device for an endoscope according to the first embodiment of the present invention in a used state.

FIG. 4 is a side sectional view of a distal end portion of a high-frequency incision device for an endoscope according to a second embodiment of the present invention.

FIG. 5 is a side sectional view of a distal end portion of a high-frequency incision device for an endoscope according to a third embodiment of the present invention.

FIG. 6 is a side view of a distal end portion of a conventional high-frequency incision device for an endoscope in use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Operation wire 3 Rod electrode

Claims (6)

[Claims] 1. A high-frequency incision device for an endoscope, wherein a high-frequency current can be supplied to a rod-like electrode protruding forward from a distal end of an electrically insulating sheath, wherein the rod-like electrode is formed by a conductive metal stranded wire. A high-frequency incision tool for an endoscope, characterized in that: 2. The high-frequency incision device for an endoscope according to claim 1, wherein the strands of the stranded wire forming the rod-shaped electrode are fixed to each other at their distal ends so that the stranded wire at the distal end is not frayed. . 3. An operation from the proximal end side of the sheath,
The high-frequency incision device for an endoscope according to claim 1 or 2, wherein a protruding length of the rod-shaped electrode from a distal end of the sheath can be adjusted. 4. A high-frequency incision instrument for an endoscope according to claim 1, wherein said rod-shaped electrode is formed in a single rod shape straight in a direction of an extension of an axis of a distal end portion of said sheath. 5. The high-frequency incision instrument for an endoscope according to claim 1, wherein the tip of said rod-shaped electrode is bent in an L-shape. 6. A high-frequency incision instrument for an endoscope according to claim 1, wherein at least a surface portion of a tip of said rod-shaped electrode is made of an electrical insulating material.